节点。js在Java中解密文本时出错

Question

我有下面的NodeJS代码用于解密，它工作得非常好，但当我当时试图在Java中转换相同的代码时，我得到了下面的错误

给定的最终块未正确填充。如果在解密过程中使用了坏密钥，则可能会出现此类问题

节点JS代码段：

  let textParts = text.split(':');
  let iv = Buffer.from(textParts.shift(), 'hex');
  let encryptedText = Buffer.from(textParts.join(':'), 'hex');
  let decrypted = decipher.update(encryptedText);
  let decipher = crypto.createDecipheriv(
    'aes-256-cbc',
    Buffer.from(ENCRYPTION_KEY),
    iv,
  );
  decrypted = Buffer.concat([decrypted, decipher.final()]);
  return decrypted.toString();

Java代码片段：

try {
    IvParameterSpec iv = new IvParameterSpec(initVector.getBytes(StandardCharsets.UTF_8));
    SecretKeySpec skeySpec = new SecretKeySpec(key.getBytes(StandardCharsets.UTF_8), "AES");
    Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
    cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
    byte[] original = cipher.doFinal(Base64.decodeBase64(encyptedData));
    return new String(original);
} catch (Exception ex) {
    ex.printStackTrace();
}

节点JS和Java代码的加密密钥都相同。 提前谢谢

Answer 1

问题似乎在于解码时java中变量的大小。 检查此链接可能会给您一些提示：

1-ejava-base64-encode-and-decode

2-given-final-block-not-properly-padded

Answer 2

如果初始向量为32字节，则需要按如下方式解密

public String decrypt(String encryptedData) {
    try {
        String data[] = encryptedData.split(":");
        IvParameterSpec iv = new IvParameterSpec(getBytes(data[0]));
        Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
        SecretKeySpec skeySpec = new SecretKeySpec(YOUR_KEY.getBytes(), "AES");
        cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
        byte[] decryptedData = cipher.doFinal(getBytes(data[1]));
        return new String(decryptedData);
    } catch (Exception e) {
        throw new RuntimeException("Error occured while decrypting data", e);
    }
}

public byte[] getBytes(String s) {                   
    String tmp;
    byte[] b = new byte[s.length() / 2];
    int i;
    for (i = 0; i < s.length() / 2; i++) {
        tmp = s.substring(i * 2, i * 2 + 2);
        b[i] = (byte)(Integer.parseInt(tmp, 16) & 0xff);
    }
    return b;
}