使用key和iv的javaaes块解密
我正在尝试将特定于BouncyCastle的实现转换为通用的实现,但由于我仍在努力学习基础知识,因此很难做到这一点 这是以前的BC代码:使用key和iv的javaaes块解密,java,security,aes,Java,Security,Aes,我正在尝试将特定于BouncyCastle的实现转换为通用的实现,但由于我仍在努力学习基础知识,因此很难做到这一点 这是以前的BC代码: public int decrypt(SecurityToken token, byte[] dataToDecrypt, int inputOffset, int inputLength, byte[] output, int outputOffset) { // Make new RijndaelEngine RijndaelEngi
public int decrypt(SecurityToken token, byte[] dataToDecrypt, int inputOffset,
int inputLength, byte[] output, int outputOffset) {
// Make new RijndaelEngine
RijndaelEngine engine = new RijndaelEngine(128);
// Make CBC blockcipher
BufferedBlockCipher bbc = new BufferedBlockCipher(
new CBCBlockCipher(engine));
// find right decryption key and right initialization vector
KeyParameter secret = new KeyParameter(
token.getRemoteEncryptingKey());
byte[] iv = token.getRemoteInitializationVector();
// initialize cipher for decryption purposes
bbc.init(false, new ParametersWithIV(secret, iv));
decryptedBytes = bbc.processBytes(dataToDecrypt, inputOffset,
inputLength, output, outputOffset);
decryptedBytes += bbc.doFinal(output, outputOffset+decryptedBytes);
return decryptedBytes;
}
到目前为止,这是我谦虚的尝试:
SecretKeySpec spec = new SecretKeySpec(
token.getRemoteEncryptingKey(),
"AES");
cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
cipher.init(Cipher.DECRYPT_MODE, spec, new IvParameterSpec(token.getRemoteInitializationVector()));
decryptedBytes = cipher.update(dataToDecrypt, inputOffset,
inputLength, output, outputOffset);
decryptedBytes += cipher.doFinal(output, outputOffset+decryptedBytes);
return decryptedBytes;
给
javax.crypto.BadPaddingException: Given final block not properly padded
下面是函数的输入:
decrypt: dataToDecrypt.length=1088 inputOffset=0 inputLength=1088 output.length=16384 outputOffset=1180
decrypt: token.getRemoteEncryptingKey()=lBjgFjfR3IilCyT5AqRnXQ==
decrypt: token.getRemoteInitializationVector()=0JFEdkuW6pMo0cwfKdZa3w==
我错过了什么
E:输入数据通常
BadPaddingException
表示:
- 原始明文没有使用您建议的填充算法进行填充。因此,数据加密时可能没有使用PKCS#5
- 您使用了错误的密钥进行解密。这会导致解密完成后填充看起来不正确
cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
致:
cipher = Cipher.getInstance("AES/CBC/NoPadding");