PBKDF2的加密

public class PasswordEncryption {
public static final String PBKDF2_ALGORITHM = "PBKDF2WithHmacSHA1";
/**
* 盐的长度
*/
public static final int SALT_BYTE_SIZE = 32 / 2;
/**
* 生成密文的长度
*/
public static final int HASH_BIT_SIZE = 128 * 4;
/**
* 迭代次数
*/
public static final int PBKDF2_ITERATIONS = 1000;
/**
* 对输入的密码进行验证
*
* @param attemptedPassword
*
待验证的密码
* @param encryptedPassword
*
密文
* @param salt
*
盐值
* @return 是否验证成功
* @throws NoSuchAlgorithmException
* @throws InvalidKeySpecException
*/
public static boolean authenticate(String attemptedPassword, String encryptedPassword, String salt)
throws NoSuchAlgorithmException, InvalidKeySpecException {
// 用相同的盐值对用户输入的密码进行加密
String encryptedAttemptedPassword = getEncryptedPassword(attemptedPassword, salt);
// 把加密后的密文和原密文进行比较，相同则验证成功，否则失败
return encryptedAttemptedPassword.equals(encryptedPassword);
}
/**
* 生成密文
*
* @param password
*
明文密码
* @param salt
*
盐值
* @return
* @throws NoSuchAlgorithmException
* @throws InvalidKeySpecException
*/
public static String getEncryptedPassword(String password, String salt) throws NoSuchAlgorithmException,
InvalidKeySpecException {
KeySpec spec = new PBEKeySpec(password.toCharArray(), fromHex(salt), PBKDF2_ITERATIONS, HASH_BIT_SIZE);
SecretKeyFactory f = SecretKeyFactory.getInstance(PBKDF2_ALGORITHM);
return toHex(f.generateSecret(spec).getEncoded());
}
/**
* 通过提供加密的强随机数生成器 生成盐
*
* @return
* @throws NoSuchAlgorithmException
*/
public static String generateSalt() throws NoSuchAlgorithmException {
SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
byte[] salt = new byte[SALT_BYTE_SIZE];
random.nextBytes(salt);
return toHex(salt);
}
/**
* 十六进制字符串转二进制字符串
*
* @param
hex
the hex string
* @return
the hex string decoded into a byte array
*/
private static byte[] fromHex(String hex) {
byte[] binary = new byte[hex.length() / 2];
for (int i = 0; i < binary.length; i++) {
binary[i] = (byte) Integer.parseInt(hex.substring(2 * i, 2 * i + 2), 16);
}
return binary;
}
/**
* 二进制字符串转十六进制字符串
*
* @param
array
the byte array to convert
* @return
a length*2 character string encoding the byte array
*/
private static String toHex(byte[] array) {
BigInteger bi = new BigInteger(1, array);
String hex = bi.toString(16);
int paddingLength = (array.length * 2) - hex.length();
if (paddingLength > 0)
return String.format("%0" + paddingLength + "d", 0) + hex;
else
return hex;
}
public static void main(String[] args) {
String password = "666666";
String salt;
String ciphertext;
try {
salt = PasswordEncryption.generateSalt();
ciphertext = PasswordEncryption.getEncryptedPassword(password, salt);
boolean result = PasswordEncryption.authenticate(password, ciphertext, salt);
System.out.println(password + "
" + password.length());
System.out.println(salt + "
" + salt.length());
System.out.println(ciphertext + "
" + ciphertext.length());
if (result) {
System.out.println("succeed");
} else {
System.out.println("failed");
}
} catch (NoSuchAlgorithmException e) {
System.out.println("NoSuchAlgorithmException");
} catch (InvalidKeySpecException e) {
System.out.println("InvalidKeySpecException");
}
}
}

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