/**
* 用私钥解密通过公钥加密的数据
*
* @param data 通过公钥加密的数据
* @param key 用来解密的私钥
* @return 解密后的数据
* @throws NoSuchAlgorithmException 假如用户的JDK不支持RSA
* @throws InvalidKeySpecException 假如根据privateKey生成密钥失败
* @throws InvalidKeyException 假如输入的RSA私钥不合法
* @throws SignatureException 假如根据privateKey生成密钥失败
* @throws UnsupportedEncodingException 假如privateKey不是使用UTF-8进行编码
* @throws NoSuchPaddingException 假如产生的密钥对有问题
* @throws BadPaddingException 假如输入的加密的数据填充数据错误
* @throws IllegalBlockSizeException 假如输入的加密的数据字节数不是BlockSize的整数倍
* @throws ShortBufferException
*/
public static byte[] decryptByPrivateKey(byte[] data, Key privateKey)
throws NoSuchAlgorithmException, InvalidKeySpecException, InvalidKeyException,
SignatureException, UnsupportedEncodingException, NoSuchPaddingException,
IllegalBlockSizeException, BadPaddingException, ShortBufferException {
// 对数据解密
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
cipher.init(Cipher.DECRYPT_MODE, privateKey);
return CipherUtil.process(cipher, 128, data);
}
/**
* 用私钥加密数据
*
* @param data 等待加密的原始数据
* @param key 用来加密的私钥
* @return 加密后的数据
* @throws NoSuchAlgorithmException 假如用户的JDK不支持RSA
* @throws InvalidKeySpecException 假如根据privateKey生成密钥失败
* @throws InvalidKeyException 假如输入的RSA私钥不合法
* @throws SignatureException 假如根据privateKey生成密钥失败
* @throws UnsupportedEncodingException 假如privateKey不是使用UTF-8进行编码
* @throws NoSuchPaddingException 假如产生的密钥对有问题
* @throws BadPaddingException 假如输入的加密的数据填充数据错误
* @throws IllegalBlockSizeException 假如输入的加密的数据字节数不是BlockSize的整数倍
* @throws ShortBufferException
*/
public static byte[] encryptByPrivateKey(byte[] data, String key)
throws NoSuchAlgorithmException, InvalidKeySpecException, InvalidKeyException,
SignatureException, UnsupportedEncodingException, NoSuchPaddingException,
IllegalBlockSizeException, BadPaddingException, ShortBufferException {
// 对密钥解密
byte[] keyBytes = Base64ForServer.base64toByte(key);
// 取得私钥
PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
Key privateKey = keyFactory.generatePrivate(pkcs8KeySpec);
// 对数据加密
Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
cipher.init(Cipher.ENCRYPT_MODE, privateKey);
return CipherUtil.process(cipher, 117, data);
}
/**
* 用公钥解密通过私钥加密的数据
*
* @param data 通过私钥加密的数据
* @param key 用来解密的公钥
* @return 解密后的数据
* @throws NoSuchAlgorithmException 假如用户的JDK不支持RSA
* @throws InvalidKeySpecException 假如根据privateKey生成密钥失败
* @throws InvalidKeyException 假如输入的RSA私钥不合法
* @throws SignatureException 假如根据privateKey生成密钥失败
* @throws UnsupportedEncodingException 假如privateKey不是使用UTF-8进行编码
* @throws NoSuchPaddingException 假如产生的密钥对有问题
* @throws BadPaddingException 假如输入的加密的数据填充数据错误
* @throws IllegalBlockSizeException 假如输入的加密的数据字节数不是BlockSize的整数倍
* @throws ShortBufferException
*/
public static byte[] decryptByPublicKey(byte[] data, String key)
throws NoSuchAlgorithmException, InvalidKeySpecException, InvalidKeyException,
SignatureException, UnsupportedEncodingException, NoSuchPaddingException,
IllegalBlockSizeException, BadPaddingException, ShortBufferException {
// 对密钥解密
byte[] keyBytes = Base64ForServer.base64toByte(key);
// 取得公钥
X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
Key publicKey = keyFactory.generatePublic(x509KeySpec);
// 对数据解密
Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
cipher.init(Cipher.DECRYPT_MODE, publicKey);
return CipherUtil.process(cipher, 128, data);
}