REMOVED OLD ENDPOINTS AND SOME ENCRYPTION AND DECRYPTION METHODS

This commit is contained in:
2025-07-23 11:51:01 +05:30
parent 4e028dd971
commit dd958b0fde
43 changed files with 481 additions and 482 deletions
@@ -1,15 +0,0 @@
package com.skycrate.backend.skycrateBackend;
import com.skycrate.backend.skycrateBackend.controller.HDFScontroller;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.security.servlet.SecurityAutoConfiguration;
@SpringBootApplication
public class SkycrateBackendApplication {
public static void main(String[] args) {
SpringApplication.run(SkycrateBackendApplication.class, args);
}
}
@@ -1,55 +0,0 @@
package com.skycrate.backend.skycrateBackend.config;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.authentication.AuthenticationProvider;
import org.springframework.security.authentication.dao.DaoAuthenticationProvider;
import org.springframework.security.config.annotation.authentication.configuration.AuthenticationConfiguration;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.core.userdetails.UsernameNotFoundException;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.crypto.password.PasswordEncoder;
import com.skycrate.backend.skycrateBackend.repository.UserRepository;
// Application-wide security configuration.
// Configures user authentication, password encoding, and authentication provider.
@Configuration
public class ApplicationConfiguration {
private final UserRepository userRepository;
public ApplicationConfiguration(UserRepository userRepository) {
this.userRepository = userRepository;
}
// Custom UserDetailsService to fetch user details by email.
@Bean
public UserDetailsService userDetailsService() {
return username -> userRepository.findByEmail(username)
.orElseThrow(() -> new UsernameNotFoundException("User not found with email: " + username));
}
// BCrypt password encoder with a higher strength for better security.
// Cost factor 12 is considered a good balance for production use.
@Bean
public PasswordEncoder passwordEncoder() {
return new BCryptPasswordEncoder(12);
}
// AuthenticationProvider using DAO with custom user service and password encoder.
@Bean
public AuthenticationProvider authenticationProvider() {
DaoAuthenticationProvider authProvider = new DaoAuthenticationProvider();
authProvider.setUserDetailsService(userDetailsService());
authProvider.setPasswordEncoder(passwordEncoder());
return authProvider;
}
// Provides the AuthenticationManager for authenticating credentials.
@Bean
public AuthenticationManager authenticationManager(AuthenticationConfiguration config) throws Exception {
return config.getAuthenticationManager();
}
}
@@ -1,39 +0,0 @@
package com.skycrate.backend.skycrateBackend.config;
import org.apache.hadoop.conf.Configuration; // Hadoop Configuration
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.security.UserGroupInformation;
import org.springframework.context.annotation.Bean;
import java.net.URI;
import java.security.PrivilegedExceptionAction;
@org.springframework.context.annotation.Configuration
public class HDFSConfig {
private static final String HDFS_URI = System.getenv("HDFS_URI"); // e.g., hdfs://namenode:9000
private static final String HDFS_USER = System.getenv("HDFS_USER"); // e.g., hdfsuser
@Bean
public FileSystem fileSystem() throws Exception {
return getHDFS();
}
public static FileSystem getHDFS() throws Exception {
if (HDFS_URI == null || HDFS_URI.isBlank()) {
throw new IllegalStateException("HDFS_URI environment variable not set.");
}
Configuration conf = new Configuration();
conf.set("fs.defaultFS", HDFS_URI);
if (HDFS_USER != null && !HDFS_USER.isBlank()) {
return UserGroupInformation.createRemoteUser(HDFS_USER)
.doAs((PrivilegedExceptionAction<FileSystem>) () ->
FileSystem.get(new URI(HDFS_URI), conf)
);
} else {
return FileSystem.get(new URI(HDFS_URI), conf);
}
}
}
@@ -1,23 +0,0 @@
package com.skycrate.backend.skycrateBackend.config;
import org.apache.catalina.connector.Connector;
import org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory;
import org.springframework.boot.web.server.WebServerFactoryCustomizer;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
@Configuration
public class HttpToHttpsRedirectConfig {
@Bean
public WebServerFactoryCustomizer<TomcatServletWebServerFactory> containerCustomizer() {
return factory -> {
Connector connector = new Connector(TomcatServletWebServerFactory.DEFAULT_PROTOCOL);
connector.setScheme("http");
connector.setPort(8085); // HTTP port
connector.setSecure(false);
connector.setRedirectPort(8443); // HTTPS port
factory.addAdditionalTomcatConnectors(connector);
};
}
}
@@ -1,52 +0,0 @@
package com.skycrate.backend.skycrateBackend.config;
import com.skycrate.backend.skycrateBackend.security.JwtAuthenticationFilter;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.HttpMethod;
import org.springframework.security.authentication.AuthenticationProvider;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.http.SessionCreationPolicy;
import org.springframework.security.web.SecurityFilterChain;
import org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter;
@Configuration
public class SecurityConfig {
private final AuthenticationProvider authenticationProvider;
private final JwtAuthenticationFilter jwtAuthenticationFilter;
public SecurityConfig(AuthenticationProvider authenticationProvider,
JwtAuthenticationFilter jwtAuthenticationFilter) {
this.authenticationProvider = authenticationProvider;
this.jwtAuthenticationFilter = jwtAuthenticationFilter;
}
@Bean
public SecurityFilterChain securityFilterChain(HttpSecurity http) throws Exception {
http
.csrf(csrf -> csrf.disable())
.sessionManagement(session -> session.sessionCreationPolicy(SessionCreationPolicy.STATELESS))
.authenticationProvider(authenticationProvider)
.authorizeHttpRequests(auth -> auth
.requestMatchers("/api/auth/login", "/api/auth/register", "/actuator/**").permitAll()
.requestMatchers(HttpMethod.GET, "/public/**").permitAll()
.anyRequest().authenticated()
)
.requiresChannel(channel -> channel
.anyRequest().requiresSecure()
)
.headers(headers -> headers
.httpStrictTransportSecurity(hsts -> hsts
.includeSubDomains(true)
.maxAgeInSeconds(31536000)
)
// Spring Security 6+ no longer supports xss.block(true), so we just enable or disable it.
.xssProtection(xss -> xss.disable())
.frameOptions(frame -> frame.deny())
)
.addFilterBefore(jwtAuthenticationFilter, UsernamePasswordAuthenticationFilter.class);
return http.build();
}
}
@@ -1,120 +0,0 @@
package com.skycrate.backend.skycrateBackend.controller;
import com.skycrate.backend.skycrateBackend.dto.LoginRequest;
import com.skycrate.backend.skycrateBackend.dto.LoginResponse;
import com.skycrate.backend.skycrateBackend.dto.RegisterUserDto;
import com.skycrate.backend.skycrateBackend.dto.TokenRefreshRequest;
import com.skycrate.backend.skycrateBackend.dto.TokenRefreshResponse;
import com.skycrate.backend.skycrateBackend.entity.RefreshToken;
import com.skycrate.backend.skycrateBackend.entity.User;
import com.skycrate.backend.skycrateBackend.repository.UserRepository;
import com.skycrate.backend.skycrateBackend.security.TokenBlacklistService;
import com.skycrate.backend.skycrateBackend.services.AuthenticationService;
import com.skycrate.backend.skycrateBackend.services.JwtService;
import com.skycrate.backend.skycrateBackend.services.RateLimiterService;
import com.skycrate.backend.skycrateBackend.services.RefreshTokenService;
import jakarta.servlet.http.HttpServletRequest;
import org.springframework.http.ResponseEntity;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.web.bind.annotation.*;
@RestController
@RequestMapping("/api/auth")
public class AuthController {
private final AuthenticationManager authManager;
private final JwtService jwtService;
private final UserRepository userRepository;
private final RefreshTokenService refreshTokenService;
private final TokenBlacklistService tokenBlacklistService;
private final RateLimiterService rateLimiterService;
private final AuthenticationService authenticationService;
public AuthController(
AuthenticationManager authManager,
JwtService jwtService,
UserRepository userRepository,
RefreshTokenService refreshTokenService,
TokenBlacklistService tokenBlacklistService,
RateLimiterService rateLimiterService,
AuthenticationService authenticationService
) {
this.authManager = authManager;
this.jwtService = jwtService;
this.userRepository = userRepository;
this.refreshTokenService = refreshTokenService;
this.tokenBlacklistService = tokenBlacklistService;
this.rateLimiterService = rateLimiterService;
this.authenticationService = authenticationService;
}
// New Register Endpoint
@PostMapping("/register")
public ResponseEntity<?> register(@RequestBody RegisterUserDto request) {
User user = authenticationService.signUp(request);
return ResponseEntity.ok("User registered successfully with username: " + user.getUsername());
}
@PostMapping("/login")
public ResponseEntity<?> login(@RequestBody LoginRequest request, HttpServletRequest servletRequest) {
String ip = servletRequest.getRemoteAddr();
if (rateLimiterService.isBlocked(ip)) {
return ResponseEntity.status(429).body("Too many login attempts. Please try again later.");
}
try {
authManager.authenticate(
new UsernamePasswordAuthenticationToken(request.getEmail(), request.getPassword())
);
} catch (Exception ex) {
rateLimiterService.recordFailedAttempt(ip);
return ResponseEntity.status(401).body("Invalid credentials.");
}
User user = userRepository.findByEmail(request.getEmail())
.orElseThrow(() -> new RuntimeException("User not found"));
rateLimiterService.resetAttempts(ip);
String accessToken = jwtService.generateToken(user);
RefreshToken refreshToken = refreshTokenService.createRefreshToken(user);
return ResponseEntity.ok(new LoginResponse(accessToken, refreshToken.getToken()));
}
@PostMapping("/logout")
public ResponseEntity<?> logout(HttpServletRequest request) {
String authHeader = request.getHeader("Authorization");
if (authHeader == null || !authHeader.startsWith("Bearer ")) {
return ResponseEntity.badRequest().body("Missing or invalid Authorization header");
}
String token = authHeader.substring(7);
tokenBlacklistService.blacklistToken(token);
String email = jwtService.extractUsername(token);
userRepository.findByEmail(email).ifPresent(refreshTokenService::deleteByUser);
return ResponseEntity.ok("Logged out successfully");
}
@PostMapping("/refresh")
public ResponseEntity<?> refresh(@RequestBody TokenRefreshRequest request) {
String requestToken = request.getRefreshToken();
return refreshTokenService.findByToken(requestToken)
.map(token -> {
if (refreshTokenService.isExpired(token)) {
return ResponseEntity.status(403).body("Refresh token expired");
}
User user = token.getUser();
String newAccessToken = jwtService.generateToken(user);
return ResponseEntity.ok(new TokenRefreshResponse(newAccessToken, requestToken));
})
.orElseGet(() -> ResponseEntity.status(403).body("Invalid refresh token"));
}
}
@@ -1,72 +0,0 @@
package com.skycrate.backend.skycrateBackend.controller;
import com.skycrate.backend.skycrateBackend.services.FileService;
import com.skycrate.backend.skycrateBackend.services.JwtService;
import jakarta.servlet.http.HttpServletRequest;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;
@RestController
@RequestMapping("/api/files")
public class FileController {
private final FileService fileService;
private final JwtService jwtService;
public FileController(FileService fileService, JwtService jwtService) {
this.fileService = fileService;
this.jwtService = jwtService;
}
@PostMapping("/upload")
public ResponseEntity<?> uploadFile(
@RequestParam("file") MultipartFile file,
HttpServletRequest request) {
try {
String token = extractToken(request);
String username = jwtService.extractUsername(token);
fileService.uploadEncryptedFile(username, file.getBytes(), file.getOriginalFilename());
return ResponseEntity.ok("File uploaded and encrypted successfully.");
} catch (Exception e) {
return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR)
.body("Upload failed: " + e.getMessage());
}
}
@GetMapping("/download/{filename}")
public ResponseEntity<?> downloadFile(
@PathVariable String filename,
@RequestParam("password") String password,
HttpServletRequest request
) {
try {
String token = extractToken(request);
String username = jwtService.extractUsername(token);
byte[] decryptedData = fileService.downloadDecryptedFile(username, password, filename);
return ResponseEntity.ok()
.header(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=\"" + filename + "\"")
.contentLength(decryptedData.length)
.contentType(MediaType.APPLICATION_OCTET_STREAM)
.body(decryptedData);
} catch (Exception e) {
return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR)
.body("File download failed: " + e.getMessage());
}
}
private String extractToken(HttpServletRequest request) {
String authHeader = request.getHeader("Authorization");
if (authHeader == null || !authHeader.startsWith("Bearer ")) {
throw new RuntimeException("Missing or invalid Authorization header");
}
return authHeader.substring(7);
}
}
@@ -1,299 +0,0 @@
package com.skycrate.backend.skycrateBackend.controller;
import com.skycrate.backend.skycrateBackend.config.HDFSConfig;
import com.skycrate.backend.skycrateBackend.dto.ResponseDTO;
import com.skycrate.backend.skycrateBackend.entity.User;
import com.skycrate.backend.skycrateBackend.repository.UserRepository;
import com.skycrate.backend.skycrateBackend.services.HDFSOperations;
import com.skycrate.backend.skycrateBackend.utils.KeyUtil;
import com.skycrate.backend.skycrateBackend.utils.RSAKeyUtil;
import org.apache.hadoop.fs.FileSystem;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.StandardCopyOption;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.util.List;
import org.springframework.core.io.FileSystemResource; // For FileSystemResource
import org.springframework.core.io.Resource; // For Resource
import org.springframework.http.HttpHeaders; // For HttpHeaders
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import java.io.File; // For java.io.File
@RestController
@RequestMapping("/api/hdfs")
public class HDFScontroller {
private final HDFSOperations hdfsOperations;
@Autowired
private UserRepository userRepository;
@Autowired
public HDFScontroller(HDFSOperations hdfsOperations) {
this.hdfsOperations = hdfsOperations;
}
@PostMapping("/createFolder")
public ResponseDTO createFolder(@RequestParam String hdfsPath) {
try {
hdfsOperations.createFolder(hdfsPath);
return new ResponseDTO("Folder created successfully", true);
} catch (Exception e) {
e.printStackTrace();
return new ResponseDTO("Failed to create folder: " + e.getMessage(), false);
}
}
@PostMapping("/uploadFile")
public ResponseDTO uploadFile(
@RequestParam("file") MultipartFile file,
@RequestParam String hdfsPath,
@RequestParam String uploadedFileName,
@RequestParam String username) {
try {
// Retrieve the user from the database using the username
User user = userRepository.findByUsername(username).orElseThrow(() -> new RuntimeException("User not found"));
// Get the public key from the user entity
byte[] publicKeyBytes = user.getPublicKey();
PublicKey publicKey = RSAKeyUtil.getPublicKeyFromBytes(publicKeyBytes);
// Encrypt the file content using the public key
byte[] encryptedData = encryptFile(file, publicKey);
// Upload the encrypted file to HDFS
hdfsOperations.uploadFile(encryptedData, hdfsPath, uploadedFileName, username);
return new ResponseDTO("File uploaded successfully", true);
} catch (IOException e) {
e.printStackTrace();
return new ResponseDTO("Failed to upload file locally: " + e.getMessage(), false);
} catch (Exception e) {
e.printStackTrace();
return new ResponseDTO("Failed to upload file to HDFS: " + e.getMessage(), false);
}
}
// Helper method to encrypt the file content using RSA encryption
private byte[] encryptFile(MultipartFile file, PublicKey publicKey) throws Exception {
// Step 1: Generate a random AES key
SecretKey aesKey = generateAESKey();
// Step 2: Encrypt the file data using AES
Cipher aesCipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
aesCipher.init(Cipher.ENCRYPT_MODE, aesKey);
byte[] fileData = file.getBytes();
byte[] encryptedData = aesCipher.doFinal(fileData);
// Step 3: Encrypt the AES key with RSA
Cipher rsaCipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
rsaCipher.init(Cipher.ENCRYPT_MODE, publicKey);
byte[] encryptedAesKey = rsaCipher.doFinal(aesKey.getEncoded());
// Step 4: Combine the encrypted AES key and the encrypted data
byte[] combined = new byte[4 + encryptedAesKey.length + encryptedData.length];
combined[0] = (byte) (encryptedAesKey.length >> 24);
combined[1] = (byte) (encryptedAesKey.length >> 16);
combined[2] = (byte) (encryptedAesKey.length >> 8);
combined[3] = (byte) encryptedAesKey.length;
System.arraycopy(encryptedAesKey, 0, combined, 4, encryptedAesKey.length);
System.arraycopy(encryptedData, 0, combined, 4 + encryptedAesKey.length, encryptedData.length);
return combined;
}
// Generate a random AES key
private SecretKey generateAESKey() throws NoSuchAlgorithmException {
KeyGenerator keyGen = KeyGenerator.getInstance("AES");
keyGen.init(256); // Use 256 bits for AES
return keyGen.generateKey();
}
private String saveFileLocally(MultipartFile file) throws IOException {
// Create a temporary directory if it doesn't exist
Path tmpDir = Paths.get("tmp");
if (!Files.exists(tmpDir)) {
Files.createDirectories(tmpDir); // Create the directory if it doesn't exist
}
Path path = tmpDir.resolve(file.getOriginalFilename());
// Copy the file to the local directory
Files.copy(file.getInputStream(), path, StandardCopyOption.REPLACE_EXISTING);
return path.toString(); // Return the local path for further processing
}
@PostMapping("/downloadFile")
public ResponseEntity<Resource> downloadFile(
@RequestParam String hdfsEncPath,
@RequestParam String username) {
try {
// Extract the file name and extension
String encFileName = new File(hdfsEncPath).getName();
String originalFileName = encFileName.replace(".enc", "");
String fileExtension = originalFileName.substring(originalFileName.lastIndexOf(".") + 1);
// Define local decrypted file path
String localDecryptedPath = "/SkyCrate/downloaded/" + originalFileName;
// Define HDFS paths for encrypted file
String encFilePath = "/SkyCrate/downloaded/" + encFileName;
FileSystem fs = HDFSConfig.getHDFS();
// Download encrypted file from HDFS
fs.copyToLocalFile(new org.apache.hadoop.fs.Path(hdfsEncPath), new org.apache.hadoop.fs.Path(encFilePath));
// Retrieve the RSA private key for the user
User user = userRepository.findByUsername(username)
.orElseThrow(() -> new RuntimeException("User not found"));
PrivateKey privateKey = RSAKeyUtil.getPrivateKeyFromBytes(user.getPrivateKey());
// Read the encrypted file content
byte[] encryptedFileContent = Files.readAllBytes(Paths.get(encFilePath));
// Step 1: Extract the AES key length from the combined data
int aesKeyLength = ((encryptedFileContent[0] & 0xFF) << 24) |
((encryptedFileContent[1] & 0xFF) << 16) |
((encryptedFileContent[2] & 0xFF) << 8) |
(encryptedFileContent[3] & 0xFF);
// Step 2: Extract the encrypted AES key and encrypted data
byte[] encryptedAesKey = new byte[aesKeyLength];
byte[] encryptedData = new byte[encryptedFileContent.length - 4 - aesKeyLength];
System.arraycopy(encryptedFileContent, 4, encryptedAesKey, 0, aesKeyLength);
System.arraycopy(encryptedFileContent, 4 + aesKeyLength, encryptedData, 0, encryptedData.length);
// Step 3: Decrypt the AES key using RSA
Cipher rsaCipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
rsaCipher.init(Cipher.DECRYPT_MODE, privateKey);
byte[] aesKeyBytes = rsaCipher.doFinal(encryptedAesKey);
// Create the AES key
SecretKey aesKey = new SecretKeySpec(aesKeyBytes, "AES");
// Step 4: Decrypt the data using AES
Cipher aesCipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
aesCipher.init(Cipher.DECRYPT_MODE, aesKey);
// Decrypt the file content using the provided decrypt method
// byte[] decryptedFileContent = RSAKeyUtil.decrypt(encryptedFileContent, privateKey);
byte[] decryptedFileContent = aesCipher.doFinal(encryptedData);
// Write the decrypted content to the original file
Files.write(Paths.get(localDecryptedPath + "." + fileExtension), decryptedFileContent);
// Log the file creation
if (Files.exists(Paths.get(localDecryptedPath + "." + fileExtension))) {
System.out.println("File created successfully at: " + localDecryptedPath + "." + fileExtension);
} else {
System.out.println("Failed to create file at: " + localDecryptedPath + "." + fileExtension);
}
// Create the decrypted file resource
File decryptedFile = new File(localDecryptedPath + "." + fileExtension);
Resource resource = new FileSystemResource(decryptedFile);
// Return the file as a response
return ResponseEntity.ok()
.contentLength(decryptedFile.length())
.contentType(MediaType.APPLICATION_OCTET_STREAM)
.header(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=\"" + decryptedFile.getName() + "\"")
.body(resource);
} catch (Exception e) {
e.printStackTrace();
return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR)
.body(null);
}
}
public void initializeKeysForUser(String username) {
try {
// Check if the public key file exists
Path publicKeyPath = Paths.get("C:\\Users\\sonal\\OneDrive\\Desktop\\SkyCrate\\Skycrate\\keys", username + "_public.key");
if (!Files.exists(publicKeyPath)) {
// Generate and store keys if they do not exist
KeyUtil.generateAndStoreKeyPair(username);
}
} catch (Exception e) {
e.printStackTrace();
}
}
@DeleteMapping("/deleteFile")
public ResponseDTO deleteFile(@RequestParam String hdfsPath) {
try {
hdfsOperations.deleteFile(hdfsPath);
return new ResponseDTO("File deleted successfully", true);
} catch (Exception e) {
return new ResponseDTO("Failed to delete file: " + e.getMessage(), false);
}
}
@DeleteMapping("/deleteFolder")
public ResponseDTO deleteFolder(@RequestParam String hdfsPath) {
try {
hdfsOperations.deleteFolder(hdfsPath);
return new ResponseDTO("Folder deleted successfully", true);
} catch (Exception e) {
return new ResponseDTO("Failed to delete folder: " + e.getMessage(), false);
}
}
@GetMapping("/listFiles")
public ResponseEntity<?> listFiles(@RequestParam String hdfsPath) {
try {
List<String> files = hdfsOperations.listFilesAndFolders(hdfsPath);
return ResponseEntity.ok(files); // Returns the list as JSON array
} catch (Exception e) {
return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR)
.body("Failed to list files: " + e.getMessage());
}
}
@GetMapping("/getUsernameByEmail")
public ResponseEntity<?> getUsernameByEmail(@RequestParam String email) {
try {
// Fetch user from the database using the provided email
User user = userRepository.findByEmail(email)
.orElseThrow(() -> new RuntimeException("User not found with email: " + email));
// // Log the retrieved user object to verify the username
// System.out.println("Retrieved user: " + user.getFullname());
// Return the username as the response
return ResponseEntity.ok(user.getFullname()); // Return the username
} catch (Exception e) {
// Handle error if user is not found or other exceptions occur
return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR)
.body("Failed to fetch username: " + e.getMessage());
}
}
}
@@ -1,13 +0,0 @@
package com.skycrate.backend.skycrateBackend.dto;
public class LoginRequest {
private String email;
private String password;
// Getters and setters
public String getEmail() { return email; }
public void setEmail(String email) { this.email = email; }
public String getPassword() { return password; }
public void setPassword(String password) { this.password = password; }
}
@@ -1,17 +0,0 @@
package com.skycrate.backend.skycrateBackend.dto;
public class LoginResponse {
private String accessToken;
private String refreshToken;
private String tokenType = "Bearer";
public LoginResponse(String accessToken, String refreshToken) {
this.accessToken = accessToken;
this.refreshToken = refreshToken;
}
// Getters
public String getAccessToken() { return accessToken; }
public String getRefreshToken() { return refreshToken; }
public String getTokenType() { return tokenType; }
}
@@ -1,25 +0,0 @@
package com.skycrate.backend.skycrateBackend.dto;
public class LoginUserDto {
private String email;
private String password;
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}
@@ -1,46 +0,0 @@
package com.skycrate.backend.skycrateBackend.dto;
import jakarta.validation.constraints.Email;
import jakarta.validation.constraints.NotBlank;
import jakarta.validation.constraints.Pattern;
import jakarta.validation.constraints.Size;
public class RegisterUserDto {
@NotBlank(message = "Email is required")
@Email(message = "Email should be valid")
private String email;
@NotBlank(message = "Password is required")
@Size(min = 8, message = "Password must be at least 8 characters")
private String password;
@NotBlank(message = "Username is required")
@Pattern(regexp = "^[a-zA-Z0-9]+$", message = "Username must be alphanumeric")
private String username;
@NotBlank(message = "Full name is required")
private String fullname;
@NotBlank(message = "First name is required")
private String firstname;
@NotBlank(message = "Last name is required")
private String lastname;
// Getters
public String getEmail() { return email; }
public String getPassword() { return password; }
public String getUsername() { return username; }
public String getFullname() { return fullname; }
public String getFirstname() { return firstname; }
public String getLastname() { return lastname; }
// Setters
public void setEmail(String email) { this.email = email; }
public void setPassword(String password) { this.password = password; }
public void setUsername(String username) { this.username = username; }
public void setFullname(String fullname) { this.fullname = fullname; }
public void setFirstname(String firstname) { this.firstname = firstname; }
public void setLastname(String lastname) { this.lastname = lastname; }
}
@@ -1,27 +0,0 @@
package com.skycrate.backend.skycrateBackend.dto;
public class ResponseDTO {
private String message;
private boolean success;
public ResponseDTO(String message, boolean success) {
this.message = message;
this.success = success;
}
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
public boolean isSuccess() {
return success;
}
public void setSuccess(boolean success) {
this.success = success;
}
}
@@ -1,33 +0,0 @@
package com.skycrate.backend.skycrateBackend.dto;
public class SignupRequest {
private String username;
private String email;
private String password;
// Getters
public String getUsername() {
return username;
}
public String getEmail() {
return email;
}
public String getPassword() {
return password;
}
// Setters
public void setUsername(String username) {
this.username = username;
}
public void setEmail(String email) {
this.email = email;
}
public void setPassword(String password) {
this.password = password;
}
}
@@ -1,13 +0,0 @@
package com.skycrate.backend.skycrateBackend.dto;
public class TokenRefreshRequest {
private String refreshToken;
public String getRefreshToken() {
return refreshToken;
}
public void setRefreshToken(String refreshToken) {
this.refreshToken = refreshToken;
}
}
@@ -1,17 +0,0 @@
package com.skycrate.backend.skycrateBackend.dto;
public class TokenRefreshResponse {
private String accessToken;
private String refreshToken;
private String tokenType = "Bearer";
public TokenRefreshResponse(String accessToken, String refreshToken) {
this.accessToken = accessToken;
this.refreshToken = refreshToken;
}
// Getters
public String getAccessToken() { return accessToken; }
public String getRefreshToken() { return refreshToken; }
public String getTokenType() { return tokenType; }
}
@@ -1,39 +0,0 @@
package com.skycrate.backend.skycrateBackend.entity;
import jakarta.persistence.*;
import lombok.*;
@Entity
@Table(name = "file_metadata")
@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
@Builder
public class FileMetadata {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
@Column(nullable = false)
private String filePath;
@Column(nullable = false)
private String username;
@Lob
@Column(nullable = false)
private byte[] salt;
@Lob
@Column(nullable = false)
private byte[] iv;
@Lob
@Column(nullable = false, name = "encrypted_key", columnDefinition = "LONGBLOB")
private byte[] encryptedKey;
@Column(nullable = false)
private long uploadedAt;
}
@@ -1,33 +0,0 @@
package com.skycrate.backend.skycrateBackend.entity;
import jakarta.persistence.*;
import java.time.Instant;
@Entity
public class RefreshToken {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
@Column(nullable = false, unique = true)
private String token;
@OneToOne
@JoinColumn(name = "user_id", referencedColumnName = "id")
private User user;
private Instant expiryDate;
// Getters and setters
public Long getId() { return id; }
public String getToken() { return token; }
public void setToken(String token) { this.token = token; }
public User getUser() { return user; }
public void setUser(User user) { this.user = user; }
public Instant getExpiryDate() { return expiryDate; }
public void setExpiryDate(Instant expiryDate) { this.expiryDate = expiryDate; }
}
@@ -1,90 +0,0 @@
package com.skycrate.backend.skycrateBackend.entity;
import jakarta.persistence.*;
import lombok.*;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.userdetails.UserDetails;
import java.util.Collection;
import java.util.List;
@Entity
@Table(name = "users")
@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
public class User implements UserDetails {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
@Column(nullable = false, unique = true)
private String email;
@Column(nullable = false)
private String password;
@Column(nullable = false, unique = true)
private String username;
@Column(nullable = false)
private String fullname;
@Lob
private byte[] publicKey;
@Lob
private byte[] privateKey;
@Lob
@Column(nullable = false)
private byte[] privateKeySalt;
@Lob
@Column(nullable = false)
private byte[] privateKeyIv;
@Builder
public User(String email, String password, String username, String fullname,
byte[] publicKey, byte[] privateKey,
byte[] privateKeySalt, byte[] privateKeyIv) {
this.email = email;
this.password = password;
this.username = username;
this.fullname = fullname;
this.publicKey = publicKey;
this.privateKey = privateKey;
this.privateKeySalt = privateKeySalt;
this.privateKeyIv = privateKeyIv;
}
// --- UserDetails interface methods ---
@Override
public Collection<? extends GrantedAuthority> getAuthorities() {
return List.of(); // No roles assigned currently
}
@Override
public String getUsername() {
return username;
}
@Override
public String getPassword() {
return this.password;
}
@Override
public boolean isAccountNonExpired() { return true; }
@Override
public boolean isAccountNonLocked() { return true; }
@Override
public boolean isCredentialsNonExpired() { return true; }
@Override
public boolean isEnabled() { return true; }
}
@@ -1,10 +0,0 @@
package com.skycrate.backend.skycrateBackend.repository;
import com.skycrate.backend.skycrateBackend.entity.FileMetadata;
import org.springframework.data.jpa.repository.JpaRepository;
import java.util.Optional;
public interface FileMetadataRepository extends JpaRepository<FileMetadata, Long> {
Optional<FileMetadata> findByUsernameAndFilePath(String username, String filePath);
}
@@ -1,18 +0,0 @@
package com.skycrate.backend.skycrateBackend.repository;
import com.skycrate.backend.skycrateBackend.entity.RefreshToken;
import com.skycrate.backend.skycrateBackend.entity.User;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Modifying;
import org.springframework.data.jpa.repository.Query;
import org.springframework.transaction.annotation.Transactional;
import java.util.Optional;
public interface RefreshTokenRepository extends JpaRepository<RefreshToken, Long> {
Optional<RefreshToken> findByToken(String token);
@Transactional
@Modifying
@Query("DELETE FROM RefreshToken t WHERE t.user = :user")
void deleteByUser(User user);
}
@@ -1,15 +0,0 @@
package com.skycrate.backend.skycrateBackend.repository;
import java.util.Optional;
import org.springframework.data.repository.CrudRepository;
import com.skycrate.backend.skycrateBackend.entity.User;
public interface UserRepository extends CrudRepository<User,Integer> {
Optional<User> findByEmail(String email);
// Custom query method to find user by username
Optional<User> findByUsername(String username);
/*
// might use later
Optional<User> findByVerificationCode(String verificationCode);
*/
}
@@ -1,25 +0,0 @@
package com.skycrate.backend.skycrateBackend.responses;
public class LoginResponse {
private String token;
private long expiresIn;
public String getToken() {
return token;
}
public LoginResponse setToken(String token) {
this.token = token;
return this;
}
public long getExpiresIn() {
return expiresIn;
}
public LoginResponse setExpiresIn(long expiresIn) {
this.expiresIn = expiresIn;
return this;
}
}
@@ -1,42 +0,0 @@
package com.skycrate.backend.skycrateBackend.security;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.*;
import java.security.SecureRandom;
import java.util.Base64;
public class EncryptionService {
private static final int KEY_LENGTH = 256;
private static final int ITERATIONS = 65536;
private static final int SALT_LENGTH = 16;
private static final int IV_LENGTH = 12;
public static byte[] generateSalt() {
byte[] salt = new byte[SALT_LENGTH];
new SecureRandom().nextBytes(salt);
return salt;
}
public static SecretKey deriveKey(String password, byte[] salt) throws Exception {
PBEKeySpec spec = new PBEKeySpec(password.toCharArray(), salt, ITERATIONS, KEY_LENGTH);
SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA256");
return new SecretKeySpec(factory.generateSecret(spec).getEncoded(), "AES");
}
public static byte[] encrypt(byte[] plaintext, SecretKey key, byte[] iv) throws Exception {
Cipher cipher = Cipher.getInstance("AES/GCM/NoPadding");
GCMParameterSpec spec = new GCMParameterSpec(128, iv);
cipher.init(Cipher.ENCRYPT_MODE, key, spec);
return cipher.doFinal(plaintext);
}
public static byte[] decrypt(byte[] ciphertext, SecretKey key, byte[] iv) throws Exception {
Cipher cipher = Cipher.getInstance("AES/GCM/NoPadding");
GCMParameterSpec spec = new GCMParameterSpec(128, iv);
cipher.init(Cipher.DECRYPT_MODE, key, spec);
return cipher.doFinal(ciphertext);
}
}
@@ -1,90 +0,0 @@
package com.skycrate.backend.skycrateBackend.security;
import com.skycrate.backend.skycrateBackend.repository.UserRepository;
import com.skycrate.backend.skycrateBackend.entity.User;
import com.skycrate.backend.skycrateBackend.services.JwtService;
import jakarta.servlet.FilterChain;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.web.authentication.WebAuthenticationDetailsSource;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.filter.OncePerRequestFilter;
import java.io.IOException;
@Component
public class JwtAuthenticationFilter extends OncePerRequestFilter {
private final JwtService jwtService;
private final UserRepository userRepository;
private final TokenBlacklistService tokenBlacklistService;
public JwtAuthenticationFilter(JwtService jwtService,
UserRepository userRepository,
TokenBlacklistService tokenBlacklistService) {
this.jwtService = jwtService;
this.userRepository = userRepository;
this.tokenBlacklistService = tokenBlacklistService;
}
@Override
protected void doFilterInternal(HttpServletRequest request,
HttpServletResponse response,
FilterChain filterChain)
throws ServletException, IOException {
String path = request.getRequestURI();
if (path.startsWith("/api/auth") || path.startsWith("/actuator")) {
filterChain.doFilter(request, response);
return;
}
final String authHeader = request.getHeader("Authorization");
final String jwt;
final String username;
if (!StringUtils.hasText(authHeader) || !authHeader.startsWith("Bearer ")) {
filterChain.doFilter(request, response);
return;
}
jwt = authHeader.substring(7);
// Check if token is blacklisted
if (tokenBlacklistService.isTokenBlacklisted(jwt)) {
response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
response.getWriter().write("Token has been blacklisted");
return;
}
try {
username = jwtService.extractUsername(jwt); // This is actually the `username`, not email
} catch (Exception e) {
response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
response.getWriter().write("Invalid JWT token");
return;
}
if (username != null && SecurityContextHolder.getContext().getAuthentication() == null) {
// ❗ Use username to find the user
User user = userRepository.findByUsername(username).orElse(null);
if (user != null && jwtService.isTokenValid(jwt, user)) {
UsernamePasswordAuthenticationToken authToken = new UsernamePasswordAuthenticationToken(
user, null, user.getAuthorities());
authToken.setDetails(new WebAuthenticationDetailsSource().buildDetails(request));
SecurityContextHolder.getContext().setAuthentication(authToken);
} else {
response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
response.getWriter().write("Expired or invalid JWT");
return;
}
}
filterChain.doFilter(request, response);
}
}
@@ -1,27 +0,0 @@
package com.skycrate.backend.skycrateBackend.security;
import com.github.benmanes.caffeine.cache.Cache;
import com.github.benmanes.caffeine.cache.Caffeine;
import org.springframework.stereotype.Service;
import java.util.concurrent.TimeUnit;
@Service
public class TokenBlacklistService {
private final Cache<String, Boolean> blacklistCache;
public TokenBlacklistService() {
this.blacklistCache = Caffeine.newBuilder()
.expireAfterWrite(1, TimeUnit.HOURS)
.build();
}
public void blacklistToken(String token) {
blacklistCache.put(token, true);
}
public boolean isTokenBlacklisted(String token) {
return blacklistCache.getIfPresent(token) != null;
}
}
@@ -1,93 +0,0 @@
package com.skycrate.backend.skycrateBackend.services;
import com.skycrate.backend.skycrateBackend.config.HDFSConfig;
import com.skycrate.backend.skycrateBackend.dto.LoginUserDto;
import com.skycrate.backend.skycrateBackend.dto.RegisterUserDto;
import com.skycrate.backend.skycrateBackend.entity.User;
import com.skycrate.backend.skycrateBackend.repository.UserRepository;
import com.skycrate.backend.skycrateBackend.utils.EncryptionUtil;
import com.skycrate.backend.skycrateBackend.utils.RSAKeyUtil;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.crypto.password.PasswordEncoder;
import org.springframework.stereotype.Service;
import javax.crypto.SecretKey;
import java.security.KeyPair;
import java.security.NoSuchAlgorithmException;
@Service
public class AuthenticationService {
private final UserRepository userRepository;
private final PasswordEncoder passwordEncoder;
private final AuthenticationManager authenticationManager;
public AuthenticationService(UserRepository userRepository,
AuthenticationManager authenticationManager,
PasswordEncoder passwordEncoder) {
this.userRepository = userRepository;
this.passwordEncoder = passwordEncoder;
this.authenticationManager = authenticationManager;
}
public User signUp(RegisterUserDto inputUser) {
// Generate RSA key pair
KeyPair keyPair;
try {
keyPair = RSAKeyUtil.generateKeyPair();
} catch (NoSuchAlgorithmException e) {
throw new RuntimeException("Failed to generate RSA key pair", e);
}
// Encrypt private key using password-derived AES key
byte[] salt = EncryptionUtil.generateSalt();
byte[] iv = EncryptionUtil.generateIv();
byte[] encryptedPrivateKey;
try {
SecretKey aesKey = EncryptionUtil.deriveKey(inputUser.getPassword().toCharArray(), salt);
encryptedPrivateKey = EncryptionUtil.encrypt(keyPair.getPrivate().getEncoded(), aesKey, iv);
} catch (Exception e) {
throw new RuntimeException("Failed to encrypt private key", e);
}
// Create user entity with encrypted private key, salt, and iv
User user = User.builder()
.fullname(inputUser.getFirstname() + " " + inputUser.getLastname())
.username(inputUser.getUsername())
.email(inputUser.getEmail())
.password(passwordEncoder.encode(inputUser.getPassword()))
.publicKey(keyPair.getPublic().getEncoded())
.privateKey(encryptedPrivateKey)
.privateKeySalt(salt)
.privateKeyIv(iv)
.build();
// Save user
User savedUser = userRepository.save(user);
// Create HDFS directory in root with username
try {
FileSystem fs = HDFSConfig.getHDFS();
Path userDir = new Path("/" + savedUser.getUsername());
if (!fs.exists(userDir)) {
fs.mkdirs(userDir);
}
} catch (Exception e) {
throw new RuntimeException("Failed to create HDFS directory for user: " + savedUser.getUsername(), e);
}
return savedUser;
}
public User authenticate(LoginUserDto inputUser) {
authenticationManager.authenticate(
new UsernamePasswordAuthenticationToken(inputUser.getEmail(), inputUser.getPassword())
);
return userRepository.findByEmail(inputUser.getEmail())
.orElseThrow(() -> new RuntimeException("User not found"));
}
}
@@ -1,79 +0,0 @@
package com.skycrate.backend.skycrateBackend.services;
import javax.crypto.*;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.SecretKeySpec;
import java.nio.charset.StandardCharsets;
import java.security.*;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.KeySpec;
import java.util.Base64;
public class EncryptionUtil {
private static final int SALT_LENGTH = 16; // in bytes
private static final int IV_LENGTH = 16; // for AES CBC
private static final int ITERATIONS = 65536;
private static final int KEY_LENGTH = 256; // bits
// --- AES key derivation using PBKDF2 ---
public static SecretKey deriveAESKey(char[] password, byte[] salt)
throws NoSuchAlgorithmException, InvalidKeySpecException {
SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA256");
KeySpec spec = new PBEKeySpec(password, salt, ITERATIONS, KEY_LENGTH);
byte[] keyBytes = factory.generateSecret(spec).getEncoded();
return new SecretKeySpec(keyBytes, "AES");
}
// --- Encrypt data using AES-CBC ---
public static byte[] encrypt(byte[] data, SecretKey key, byte[] iv)
throws GeneralSecurityException {
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
IvParameterSpec ivSpec = new IvParameterSpec(iv);
cipher.init(Cipher.ENCRYPT_MODE, key, ivSpec);
return cipher.doFinal(data);
}
// --- Decrypt data using AES-CBC ---
public static byte[] decrypt(byte[] encryptedData, SecretKey key, byte[] iv)
throws GeneralSecurityException {
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
IvParameterSpec ivSpec = new IvParameterSpec(iv);
cipher.init(Cipher.DECRYPT_MODE, key, ivSpec);
return cipher.doFinal(encryptedData);
}
// --- Generate random salt ---
public static byte[] generateSalt() {
byte[] salt = new byte[SALT_LENGTH];
new SecureRandom().nextBytes(salt);
return salt;
}
// --- Generate random IV ---
public static byte[] generateIV() {
byte[] iv = new byte[IV_LENGTH];
new SecureRandom().nextBytes(iv);
return iv;
}
// --- Optional: Utility to base64 encode data ---
public static String encodeBase64(byte[] data) {
return Base64.getEncoder().encodeToString(data);
}
public static byte[] decodeBase64(String base64) {
return Base64.getDecoder().decode(base64);
}
}
@@ -1,114 +0,0 @@
package com.skycrate.backend.skycrateBackend.services;
import com.skycrate.backend.skycrateBackend.config.HDFSConfig;
import com.skycrate.backend.skycrateBackend.entity.FileMetadata;
import com.skycrate.backend.skycrateBackend.entity.User;
import com.skycrate.backend.skycrateBackend.repository.FileMetadataRepository;
import com.skycrate.backend.skycrateBackend.repository.UserRepository;
import com.skycrate.backend.skycrateBackend.utils.EncryptionUtil;
import com.skycrate.backend.skycrateBackend.utils.RSAKeyUtil;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service;
import javax.crypto.SecretKey;
import java.io.ByteArrayInputStream;
import java.security.PrivateKey;
import java.security.PublicKey;
@Service
public class FileService {
private static final Logger log = LoggerFactory.getLogger(FileService.class);
private final FileMetadataRepository fileMetadataRepository;
private final UserRepository userRepository;
public FileService(FileMetadataRepository fileMetadataRepository, UserRepository userRepository) {
this.fileMetadataRepository = fileMetadataRepository;
this.userRepository = userRepository;
}
public void uploadEncryptedFile(String username, byte[] fileContent, String filename) throws Exception {
log.info("Starting upload for user={}, file={}", username, filename);
try {
User user = userRepository.findByUsername(username)
.orElseThrow(() -> new RuntimeException("User not found: " + username));
SecretKey aesKey = EncryptionUtil.generateAESKey();
byte[] salt = EncryptionUtil.generateSalt(); // reserved for future use
byte[] iv = EncryptionUtil.generateIv();
byte[] encryptedData = EncryptionUtil.encrypt(fileContent, aesKey, iv);
PublicKey publicKey = RSAKeyUtil.decodePublicKey(user.getPublicKey());
byte[] encryptedAesKey = EncryptionUtil.encryptRSA(aesKey.getEncoded(), publicKey);
Path userDir = new Path("/" + username);
Path filePath = new Path(userDir, filename);
FileSystem fs = HDFSConfig.getHDFS();
if (!fs.exists(userDir)) {
log.info("Creating directory in HDFS: {}", userDir);
fs.mkdirs(userDir);
}
log.info("Writing encrypted file to HDFS: {}", filePath);
try (FSDataOutputStream out = fs.create(filePath, true);
ByteArrayInputStream in = new ByteArrayInputStream(encryptedData)) {
in.transferTo(out);
}
FileMetadata metadata = FileMetadata.builder()
.username(username)
.filePath(filePath.toString())
.salt(salt)
.iv(iv)
.encryptedKey(encryptedAesKey)
.uploadedAt(System.currentTimeMillis())
.build();
fileMetadataRepository.save(metadata);
log.info("Upload complete: file={} for user={}", filename, username);
} catch (Exception e) {
log.error("Error during file upload for user={}, file={}: {}", username, filename, e.getMessage(), e);
throw e;
}
}
public byte[] downloadDecryptedFile(String username, String password, String filename) throws Exception {
log.info("Download request: user={}, file={}", username, filename);
try {
User user = userRepository.findByUsername(username)
.orElseThrow(() -> new RuntimeException("User not found: " + username));
Path filePath = new Path("/" + username + "/" + filename);
FileMetadata metadata = fileMetadataRepository.findByUsernameAndFilePath(username, filePath.toString())
.orElseThrow(() -> new RuntimeException("File metadata not found for: " + filePath));
SecretKey derivedKey = EncryptionUtil.deriveKey(password.toCharArray(), user.getPrivateKeySalt());
byte[] decryptedPrivateKeyBytes = EncryptionUtil.decrypt(user.getPrivateKey(), derivedKey, user.getPrivateKeyIv());
PrivateKey privateKey = RSAKeyUtil.decodePrivateKey(decryptedPrivateKeyBytes);
byte[] aesKeyBytes = EncryptionUtil.decryptRSA(metadata.getEncryptedKey(), privateKey);
SecretKey aesKey = EncryptionUtil.rebuildAESKey(aesKeyBytes);
FileSystem fs = HDFSConfig.getHDFS();
byte[] encryptedData;
try (FSDataInputStream in = fs.open(filePath)) {
encryptedData = in.readAllBytes();
}
return EncryptionUtil.decrypt(encryptedData, aesKey, metadata.getIv());
} catch (Exception e) {
log.error("Download failed for user={}, file={}: {}", username, filename, e.getMessage(), e);
throw e;
}
}
}
@@ -1,238 +0,0 @@
package com.skycrate.backend.skycrateBackend.services;
import com.skycrate.backend.skycrateBackend.config.HDFSConfig;
import com.skycrate.backend.skycrateBackend.entity.User;
import com.skycrate.backend.skycrateBackend.repository.UserRepository;
import com.skycrate.backend.skycrateBackend.utils.RSAKeyUtil;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IOUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.util.ArrayList;
import java.util.List;
@Service
public class HDFSOperations {
private final UserRepository userRepository;
@Autowired
public HDFSOperations(UserRepository userRepository) {
this.userRepository = userRepository;
}
// public void uploadFile(byte[] fileData, String hdfsPath, String uploadedFileName, String username) {
// try {
// FileSystem fs = HDFSConfig.getHDFS();
//
// // Create an InputStream from the byte array
// ByteArrayInputStream inputStream = new ByteArrayInputStream(fileData);
//
// // Prepare the path for HDFS
// String finalHdfsPath = hdfsPath.endsWith("/") ? hdfsPath + uploadedFileName : hdfsPath + "/" + uploadedFileName;
//
// // Upload the file directly to HDFS from the InputStream
// Path hdfsFilePath = new Path(finalHdfsPath);
// FSDataOutputStream outputStream = fs.create(hdfsFilePath);
// IOUtils.copyBytes(inputStream, outputStream, 4096, true);
//
// } catch (IOException e) {
// // Handle I/O exception and log the error
// throw new RuntimeException("Failed to upload file to HDFS: " + e.getMessage(), e);
// } catch (Exception e) {
// // Catch any other exceptions
// throw new RuntimeException("Failed to upload file to HDFS: " + e.getMessage(), e);
// }
// }
//
// public void downloadFile(String hdfsEncPath, String localPathWithoutExt, String username) {
// try {
// FileSystem fs = HDFSConfig.getHDFS();
//
// // Extract file name and extension
// String encFileName = new File(hdfsEncPath).getName();
// String originalFileName = encFileName.replace(".enc", "");
// String fileExtension = originalFileName.substring(originalFileName.lastIndexOf(".") + 1);
//
// String fullDecryptedPath = localPathWithoutExt + "/" + originalFileName;
// String encFilePath = fullDecryptedPath + ".enc";
// String keyFilePath = fullDecryptedPath + ".key";
//
// // Download encrypted file and AES key from HDFS
// fs.copyToLocalFile(new Path(hdfsEncPath), new Path(encFilePath));
// fs.copyToLocalFile(new Path(hdfsEncPath.replace(".enc", ".key")), new Path(keyFilePath));
//
// // Read the encrypted AES key
// byte[] encryptedAesKey = Files.readAllBytes(Paths.get(keyFilePath));
// System.out.println("Length of encrypted AES key: " + encryptedAesKey.length);
//
// // Retrieve the RSA private key for the user
// User user = userRepository.findByUsername(username)
// .orElseThrow(() -> new RuntimeException("User not found"));
// PrivateKey privateKey = RSAKeyUtil.getPrivateKeyFromBytes(user.getPrivateKey());
//
// Cipher rsaCipher = Cipher.getInstance("RSA");
// rsaCipher.init(Cipher.DECRYPT_MODE, privateKey);
// byte[] aesKeyBytes = rsaCipher.doFinal(encryptedAesKey);
//
// // Ensure valid AES key length
// if (aesKeyBytes.length != 16 && aesKeyBytes.length != 24 && aesKeyBytes.length != 32) {
// throw new RuntimeException("Invalid AES key length: " + aesKeyBytes.length + " bytes");
// }
//
// SecretKey aesKey = new SecretKeySpec(aesKeyBytes, 0, aesKeyBytes.length, "AES");
//
// // Read the encrypted file content
// byte[] encryptedFileContent = Files.readAllBytes(Paths.get(encFilePath));
//
// // Decrypt the file content using AES
// Cipher aesCipher = Cipher.getInstance("AES/ECB/PKCS5Padding"); // Specify padding
// aesCipher.init(Cipher.DECRYPT_MODE, aesKey);
// byte[] decryptedFileContent = aesCipher.doFinal(encryptedFileContent);
//
// // Write the decrypted content to the original file
// Files.write(Paths.get(fullDecryptedPath + "." + fileExtension), decryptedFileContent);
//
// // Cleanup temporary files
// Files.deleteIfExists(Paths.get(encFilePath));
// Files.deleteIfExists(Paths.get(keyFilePath));
//
// } catch (Exception e) {
// throw new RuntimeException("Failed to download or decrypt file: " + e.getMessage(), e);
// }
// }
public void uploadFile(byte[] fileData, String hdfsPath, String uploadedFileName, String username) {
try {
FileSystem fs = HDFSConfig.getHDFS();
ByteArrayInputStream inputStream = new ByteArrayInputStream(fileData);
String finalHdfsPath = hdfsPath.endsWith("/") ? hdfsPath + uploadedFileName : hdfsPath + "/" + uploadedFileName;
Path hdfsFilePath = new Path(finalHdfsPath);
try (FSDataOutputStream outputStream = fs.create(hdfsFilePath)) {
IOUtils.copyBytes(inputStream, outputStream, 4096, true);
}
} catch (IOException e) {
throw new RuntimeException("Failed to upload file to HDFS: " + e.getMessage(), e);
} catch (Exception e) {
throw new RuntimeException(e);
}
}
public void downloadFile(String hdfsEncPath, String localPathWithoutExt, String username) {
try {
FileSystem fs = HDFSConfig.getHDFS();
String encFilePath = localPathWithoutExt + ".enc";
fs.copyToLocalFile(new Path(hdfsEncPath), new Path(encFilePath));
User user = userRepository.findByUsername(username)
.orElseThrow(() -> new RuntimeException("User not found"));
PrivateKey privateKey = RSAKeyUtil.getPrivateKeyFromBytes(user.getPrivateKey());
byte[] encryptedFileContent = Files.readAllBytes(Paths.get(encFilePath));
byte[] decryptedFileContent = RSAKeyUtil.decrypt(encryptedFileContent, privateKey);
Files.write(Paths.get(localPathWithoutExt), decryptedFileContent);
Files.deleteIfExists(Paths.get(encFilePath));
} catch (Exception e) {
throw new RuntimeException("Failed to download or decrypt file: " + e.getMessage(), e);
}
}
public void createFolder(String hdfsPath) {
try {
FileSystem fs = HDFSConfig.getHDFS();
Path path = new Path(hdfsPath);
if (!fs.exists(path)) {
fs.mkdirs(path);
}
} catch (IOException e) {
// Handle I/O exception and log the error
throw new RuntimeException("Failed to create folder in HDFS due to I/O issue: " + e.getMessage(), e);
} catch (Exception e) {
// Catch any other exceptions
throw new RuntimeException("Failed to create folder: " + e.getMessage(), e);
}
}
public void deleteFile(String hdfsFilePath) {
try {
FileSystem fs = HDFSConfig.getHDFS();
Path path = new Path(hdfsFilePath);
if (fs.exists(path)) {
fs.delete(path, false);
}
} catch (IOException e) {
// Handle I/O exception and log the error
throw new RuntimeException("Failed to delete file due to I/O issue: " + e.getMessage(), e);
} catch (Exception e) {
// Catch any other exceptions
throw new RuntimeException("Failed to delete file: " + e.getMessage(), e);
}
}
public void deleteFolder(String hdfsFolderPath) {
try {
FileSystem fs = HDFSConfig.getHDFS();
Path path = new Path(hdfsFolderPath);
if (fs.exists(path)) {
fs.delete(path, true);
}
} catch (IOException e) {
// Handle I/O exception and log the error
throw new RuntimeException("Failed to delete folder due to I/O issue: " + e.getMessage(), e);
} catch (Exception e) {
// Catch any other exceptions
throw new RuntimeException("Failed to delete folder: " + e.getMessage(), e);
}
}
public List<String> listFilesAndFolders(String hdfsPath) {
List<String> results = new ArrayList<>();
try {
FileSystem fs = HDFSConfig.getHDFS();
Path path = new Path(hdfsPath);
if (fs.exists(path)) {
listFilesAndFoldersRecursively(fs, path, "", results);
} else {
throw new RuntimeException("HDFS path does not exist: " + hdfsPath);
}
} catch (IOException e) {
throw new RuntimeException("Failed to list files and folders due to I/O issue: " + e.getMessage(), e);
} catch (Exception e) {
throw new RuntimeException("Failed to list files and folders: " + e.getMessage(), e);
}
return results;
}
private void listFilesAndFoldersRecursively(FileSystem fs, Path path, String indent, List<String> results) throws IOException {
FileStatus[] fileStatuses = fs.listStatus(path);
for (FileStatus fileStatus : fileStatuses) {
String entry = indent + (fileStatus.isDirectory() ? "📁 " : "📄 ") + fileStatus.getPath().getName();
results.add(entry);
if (fileStatus.isDirectory()) {
listFilesAndFoldersRecursively(fs, fileStatus.getPath(), indent + " ", results);
}
}
}
}
@@ -1,69 +0,0 @@
package com.skycrate.backend.skycrateBackend.services;
import com.skycrate.backend.skycrateBackend.entity.User;
import io.jsonwebtoken.*;
import io.jsonwebtoken.io.Decoders;
import io.jsonwebtoken.security.Keys;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.stereotype.Service;
import java.security.Key;
import java.util.Date;
import java.util.function.Function;
@Service
public class JwtService {
@Value("${security.jwt.secret-key}")
private String secretKey;
@Value("${security.jwt.expiration-time}")
private long expirationTime;
private static final String SECRET_KEY = "PPp27xSTfBwOpRn4/AV6gPzQSnQg+Oi80KdWfCcuAHs=";
private Key getSigningKey() {
byte[] keyBytes = Decoders.BASE64.decode(SECRET_KEY);
return Keys.hmacShaKeyFor(keyBytes);
}
public String extractUsername(String token) {
return extractClaim(token, Claims::getSubject);
}
public Date extractExpiration(String token) {
return extractClaim(token, Claims::getExpiration);
}
public <T> T extractClaim(String token, Function<Claims, T> claimsResolver) {
Claims claims = Jwts.parserBuilder()
.setSigningKey(getSigningKey())
.build()
.parseClaimsJws(token)
.getBody();
return claimsResolver.apply(claims);
}
public boolean isTokenValid(String token, UserDetails userDetails) {
final String username = extractUsername(token);
return (username.equals(userDetails.getUsername()) && !isTokenExpired(token));
}
public boolean isTokenExpired(String token) {
return extractExpiration(token).before(new Date());
}
public String generateToken(UserDetails userDetails) {
return Jwts.builder()
.setSubject(userDetails.getUsername())
.setIssuedAt(new Date())
.setExpiration(new Date(System.currentTimeMillis() + expirationTime))
.signWith(getSigningKey(), SignatureAlgorithm.HS256)
.compact();
}
public String generateToken(User user) {
return generateToken((UserDetails) user);
}
}
@@ -1,23 +0,0 @@
// NEED TO IMPLEMENT SAHI SE
package com.skycrate.backend.skycrateBackend.services;
import org.springframework.stereotype.Service;
import java.util.concurrent.ConcurrentHashMap;
@Service
public class RateLimiterService {
private final ConcurrentHashMap<String, Integer> attempts = new ConcurrentHashMap<>();
public boolean isBlocked(String ip) {
return attempts.getOrDefault(ip, 0) >= 5;
}
public void recordFailedAttempt(String ip) {
attempts.put(ip, attempts.getOrDefault(ip, 0) + 1);
}
public void resetAttempts(String ip) {
attempts.remove(ip);
}
}
@@ -1,50 +0,0 @@
package com.skycrate.backend.skycrateBackend.services;
import com.skycrate.backend.skycrateBackend.entity.RefreshToken;
import com.skycrate.backend.skycrateBackend.entity.User;
import com.skycrate.backend.skycrateBackend.repository.RefreshTokenRepository;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import java.time.Instant;
import java.util.Optional;
import java.util.UUID;
@Service
public class RefreshTokenService {
private final RefreshTokenRepository refreshTokenRepo;
@Value("${security.jwt.refresh-expiry-ms:604800000}") // 7 days default
private Long refreshTokenDurationMs;
public RefreshTokenService(RefreshTokenRepository refreshTokenRepo) {
this.refreshTokenRepo = refreshTokenRepo;
}
@Transactional
public RefreshToken createRefreshToken(User user) {
refreshTokenRepo.deleteByUser(user);
refreshTokenRepo.flush();
RefreshToken token = new RefreshToken();
token.setUser(user);
token.setExpiryDate(Instant.now().plusMillis(refreshTokenDurationMs));
token.setToken(UUID.randomUUID().toString());
return refreshTokenRepo.save(token);
}
public Optional<RefreshToken> findByToken(String token) {
return refreshTokenRepo.findByToken(token);
}
public boolean isExpired(RefreshToken token) {
return token.getExpiryDate().isBefore(Instant.now());
}
@Transactional
public void deleteByUser(User user) {
refreshTokenRepo.deleteByUser(user);
}
}
@@ -1,52 +0,0 @@
package com.skycrate.backend.skycrateBackend.services;
import com.skycrate.backend.skycrateBackend.dto.SignupRequest;
import com.skycrate.backend.skycrateBackend.entity.User;
import com.skycrate.backend.skycrateBackend.repository.UserRepository;
import org.springframework.security.crypto.password.PasswordEncoder;
import org.springframework.stereotype.Service;
import org.springframework.web.client.RestTemplate;
import java.math.BigInteger;
import java.security.MessageDigest;
@Service
public class UserService {
private final UserRepository userRepository;
private final PasswordEncoder passwordEncoder;
public UserService(UserRepository userRepository, PasswordEncoder passwordEncoder) {
this.userRepository = userRepository;
this.passwordEncoder = passwordEncoder;
}
public void registerUser(SignupRequest request) {
if (isPasswordPwned(request.getPassword())) {
throw new IllegalArgumentException("Password has been compromised in data breaches.");
}
User user = new User();
user.setUsername(request.getUsername());
user.setEmail(request.getEmail());
user.setPassword(passwordEncoder.encode(request.getPassword()));
userRepository.save(user);
}
private boolean isPasswordPwned(String password) {
try {
MessageDigest md = MessageDigest.getInstance("SHA-1");
byte[] hash = md.digest(password.getBytes());
String fullHash = String.format("%040x", new BigInteger(1, hash)).toUpperCase();
String prefix = fullHash.substring(0, 5);
String suffix = fullHash.substring(5);
RestTemplate restTemplate = new RestTemplate();
String response = restTemplate.getForObject("https://api.pwnedpasswords.com/range/" + prefix, String.class);
return response != null && response.contains(suffix);
} catch (Exception e) {
return false; // If API fails, allow but log in production
}
}
}
@@ -1,94 +0,0 @@
package com.skycrate.backend.skycrateBackend.utils;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.*;
import java.security.*;
import javax.crypto.spec.PBEKeySpec;
import java.util.Arrays;
public class EncryptionUtil {
private static final int SALT_LENGTH = 16;
private static final int IV_LENGTH = 16;
private static final int ITERATIONS = 65536;
private static final int KEY_LENGTH = 256;
private static final String PBKDF2_ALGORITHM = "PBKDF2WithHmacSHA1";
private static final String AES_CIPHER = "AES/CBC/PKCS5Padding";
private static final String RSA_CIPHER = "RSA/ECB/OAEPWithSHA-256AndMGF1Padding";
private static final SecureRandom secureRandom = new SecureRandom();
// ------------------------ AES ------------------------
public static byte[] generateSalt() {
byte[] salt = new byte[SALT_LENGTH];
secureRandom.nextBytes(salt);
return salt;
}
public static byte[] generateIv() {
byte[] iv = new byte[IV_LENGTH];
secureRandom.nextBytes(iv);
return iv;
}
public static SecretKey deriveKey(char[] password, byte[] salt) throws Exception {
SecretKeyFactory factory = SecretKeyFactory.getInstance(PBKDF2_ALGORITHM);
PBEKeySpec spec = new PBEKeySpec(password, salt, ITERATIONS, KEY_LENGTH);
SecretKey tmp = factory.generateSecret(spec);
return new SecretKeySpec(tmp.getEncoded(), "AES");
}
public static SecretKey generateAESKey() throws Exception {
byte[] keyBytes = new byte[KEY_LENGTH / 8]; // 256 bits
secureRandom.nextBytes(keyBytes);
return new SecretKeySpec(keyBytes, "AES");
}
public static SecretKey rebuildAESKey(byte[] keyBytes) {
return new SecretKeySpec(keyBytes, "AES");
}
public static byte[] encrypt(byte[] plaintext, SecretKey key, byte[] iv) throws Exception {
Cipher cipher = Cipher.getInstance(AES_CIPHER);
IvParameterSpec ivSpec = new IvParameterSpec(iv);
cipher.init(Cipher.ENCRYPT_MODE, key, ivSpec);
return cipher.doFinal(plaintext);
}
public static byte[] decrypt(byte[] ciphertext, SecretKey key, byte[] iv) throws Exception {
Cipher cipher = Cipher.getInstance(AES_CIPHER);
IvParameterSpec ivSpec = new IvParameterSpec(iv);
cipher.init(Cipher.DECRYPT_MODE, key, ivSpec);
return cipher.doFinal(ciphertext);
}
// ------------------------ RSA ------------------------
public static byte[] encryptRSA(byte[] data, PublicKey publicKey) throws Exception {
Cipher cipher = Cipher.getInstance(RSA_CIPHER);
cipher.init(Cipher.ENCRYPT_MODE, publicKey);
return cipher.doFinal(data);
}
public static byte[] decryptRSA(byte[] data, PrivateKey privateKey) throws Exception {
Cipher cipher = Cipher.getInstance(RSA_CIPHER);
cipher.init(Cipher.DECRYPT_MODE, privateKey);
return cipher.doFinal(data);
}
// --------- Encrypt/decrypt RSA private key using AES derived from password ---------
public static byte[] encryptPrivateKey(PrivateKey privateKey, String password, byte[] salt, byte[] iv) throws Exception {
SecretKey aesKey = deriveKey(password.toCharArray(), salt);
return encrypt(privateKey.getEncoded(), aesKey, iv);
}
public static byte[] decryptPrivateKey(byte[] encryptedPrivateKey, String password, byte[] salt, byte[] iv) throws Exception {
SecretKey aesKey = deriveKey(password.toCharArray(), salt);
return decrypt(encryptedPrivateKey, aesKey, iv);
}
}
@@ -1,39 +0,0 @@
package com.skycrate.backend.skycrateBackend.utils;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.security.*;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
public class KeyUtil {
public static void generateAndStoreKeyPair(String username) throws Exception {
KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");
keyPairGenerator.initialize(2048); // Key size
KeyPair keyPair = keyPairGenerator.generateKeyPair();
// Store the public key
Path publicKeyPath = Paths.get("C:\\Users\\sonal\\OneDrive\\Desktop\\SkyCrate\\Skycrate\\keys", username + "_public.key");
Files.write(publicKeyPath, keyPair.getPublic().getEncoded());
// Store the private key
Path privateKeyPath = Paths.get("C:\\Users\\sonal\\OneDrive\\Desktop\\SkyCrate\\Skycrate\\keys", username + "_private.key");
Files.write(privateKeyPath, keyPair.getPrivate().getEncoded());
}
public static PublicKey getPublicKeyForUser(String username) throws Exception {
Path path = Paths.get("C:\\Users\\sonal\\OneDrive\\Desktop\\SkyCrate\\Skycrate\\keys", username + "_public.key");
byte[] bytes = Files.readAllBytes(path);
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(bytes);
return KeyFactory.getInstance("RSA").generatePublic(keySpec);
}
public static PrivateKey getPrivateKeyForUser(String username) throws Exception {
Path path = Paths.get("C:\\Users\\sonal\\OneDrive\\Desktop\\SkyCrate\\Skycrate\\keys", username + "_private.key");
byte[] bytes = Files.readAllBytes(path);
PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(bytes);
return KeyFactory.getInstance("RSA").generatePrivate(keySpec);
}
}
@@ -1,73 +0,0 @@
package com.skycrate.backend.skycrateBackend.utils;
import javax.crypto.*;
import java.security.*;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import javax.crypto.spec.SecretKeySpec;
public class RSAKeyUtil {
// Generate RSA Key Pair
public static KeyPair generateKeyPair() throws NoSuchAlgorithmException {
KeyPairGenerator generator = KeyPairGenerator.getInstance("RSA");
generator.initialize(2048); // Key size
return generator.generateKeyPair();
}
// Convert byte array to PublicKey
public static PublicKey getPublicKeyFromBytes(byte[] publicKeyBytes) throws Exception {
X509EncodedKeySpec spec = new X509EncodedKeySpec(publicKeyBytes);
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
return keyFactory.generatePublic(spec);
}
// Convert byte array to PrivateKey
public static PrivateKey getPrivateKeyFromBytes(byte[] privateKeyBytes) throws Exception {
PKCS8EncodedKeySpec spec = new PKCS8EncodedKeySpec(privateKeyBytes);
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
return keyFactory.generatePrivate(spec);
}
// Shorthand decode aliases
public static PublicKey decodePublicKey(byte[] publicKeyBytes) throws Exception {
return getPublicKeyFromBytes(publicKeyBytes);
}
public static PrivateKey decodePrivateKey(byte[] privateKeyBytes) throws Exception {
return getPrivateKeyFromBytes(privateKeyBytes);
}
// Encrypt data using RSA (with padding)
public static byte[] encrypt(byte[] data, PublicKey publicKey) throws Exception {
Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
cipher.init(Cipher.ENCRYPT_MODE, publicKey);
return cipher.doFinal(data);
}
// Decrypt data using RSA (with padding)
public static byte[] decrypt(byte[] encryptedData, PrivateKey privateKey) throws Exception {
Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
cipher.init(Cipher.DECRYPT_MODE, privateKey);
return cipher.doFinal(encryptedData);
}
// AES key generation
public static SecretKey generateAESKey(int keySize) throws NoSuchAlgorithmException {
if (keySize != 128 && keySize != 192 && keySize != 256) {
throw new IllegalArgumentException("Invalid AES key size. Must be 128, 192, or 256 bits.");
}
KeyGenerator keyGenerator = KeyGenerator.getInstance("AES");
keyGenerator.init(keySize);
return keyGenerator.generateKey();
}
public static byte[] encryptAESKey(SecretKey aesKey, PublicKey publicKey) throws Exception {
return encrypt(aesKey.getEncoded(), publicKey);
}
public static SecretKey decryptAESKey(byte[] encryptedAESKey, PrivateKey privateKey, int keySize) throws Exception {
byte[] decryptedKey = decrypt(encryptedAESKey, privateKey);
return new SecretKeySpec(decryptedKey, 0, decryptedKey.length, "AES");
}
}