com.xxdb

Class CryptoUtils

java.lang.Object

com.xxdb.CryptoUtils

public class CryptoUtils
extends Object

Constructor Summary

Constructors

Constructor and Description
CryptoUtils()

Method Summary

Modifier and Type	Method and Description
static byte[]	base64Decode(String input, boolean noNewLines)
static String	base64Encode(byte[] text, boolean noNewLines)
static byte[]	computeClientKey(byte[] saltedPassword) Calculate client key
static byte[]	computeClientSignature(byte[] storedKey, String authMessage) Calculate client signature
static byte[]	computeProof(byte[] clientKey, byte[] clientSignature) Calculate proof (XOR operation between client key and client signature)
static byte[]	computeServerKey(byte[] saltedPassword) Calculate server key
static byte[]	computeServerSignature(byte[] serverKey, String authMessage) Calculate server signature
static byte[]	computeStoredKey(byte[] clientKey) Calculate stored key (SHA-256 hash of client key)
static String	generateNonce(int length)
static byte[]	hmacSha256(byte[] key, byte[] data) Calculate HMAC-SHA256
static byte[]	pbkdf2HmacSha256(String password, byte[] salt, int iterCount)
static byte[]	sha256(byte[] data) Calculate SHA-256 hash

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

CryptoUtils

public CryptoUtils()

Method Detail

base64Encode

public static String base64Encode(byte[] text,
                                  boolean noNewLines)

base64Decode

public static byte[] base64Decode(String input,
                                  boolean noNewLines)

generateNonce

public static String generateNonce(int length)

pbkdf2HmacSha256

public static byte[] pbkdf2HmacSha256(String password,
                                      byte[] salt,
                                      int iterCount)

computeClientKey

public static byte[] computeClientKey(byte[] saltedPassword)

Calculate client key

Parameters:

saltedPassword - Password processed with PBKDF2

Returns:

Client key

computeStoredKey

public static byte[] computeStoredKey(byte[] clientKey)

Calculate stored key (SHA-256 hash of client key)

Parameters:

clientKey - Client key

Returns:

Stored key

computeClientSignature

public static byte[] computeClientSignature(byte[] storedKey,
                                            String authMessage)

Calculate client signature

Parameters:

storedKey - Stored key

authMessage - Authentication message

Returns:

Client signature

computeProof

public static byte[] computeProof(byte[] clientKey,
                                  byte[] clientSignature)

Calculate proof (XOR operation between client key and client signature)

Parameters:

clientKey - Client key

clientSignature - Client signature

Returns:

Proof result

computeServerKey

public static byte[] computeServerKey(byte[] saltedPassword)

Calculate server key

Parameters:

saltedPassword - Password processed with PBKDF2

Returns:

Server key

computeServerSignature

public static byte[] computeServerSignature(byte[] serverKey,
                                            String authMessage)

Calculate server signature

Parameters:

serverKey - Server key

authMessage - Authentication message

Returns:

Server signature

hmacSha256

public static byte[] hmacSha256(byte[] key,
                                byte[] data)

Calculate HMAC-SHA256

Parameters:

key - HMAC key

data - Data to calculate HMAC for

Returns:

HMAC result

sha256

public static byte[] sha256(byte[] data)

Calculate SHA-256 hash

Parameters:

data - Data to hash

Returns:

Hash result