Question

Tengo las siguientes funciones para encriptar y desencriptar un string en C＃，y necesito desencriptarlo en java con misma key e initvector。

请帮助我。

对于C＃中的字符串加密和解密，我具有以下功能。我需要使用相同的密钥和initvector在Java中对其进行解密。

谢谢。

public const string PASS_PHRASE = "123456789";
private const string initVector = "pemgail9uzpgzl88";
private const int keysize = 256;

public string EncryptString(string plainText)
        {
            byte[] initVectorBytes = Encoding.UTF8.GetBytes(initVector);
            byte[] plainTextBytes = Encoding.UTF8.GetBytes(plainText);
            PasswordDeriveBytes password = new PasswordDeriveBytes(PASS_PHRASE, null);
            byte[] keyBytes = password.GetBytes(keysize / 8);
            RijndaelManaged symmetricKey = new RijndaelManaged();
            symmetricKey.Mode = CipherMode.CBC;
            ICryptoTransform encryptor = symmetricKey.CreateEncryptor(keyBytes, initVectorBytes);
            MemoryStream memoryStream = new MemoryStream();
            CryptoStream cryptoStream = new CryptoStream(memoryStream, encryptor, CryptoStreamMode.Write);
            cryptoStream.Write(plainTextBytes, 0, plainTextBytes.Length);
            cryptoStream.FlushFinalBlock();
            byte[] cipherTextBytes = memoryStream.ToArray();
            memoryStream.Close();
            cryptoStream.Close();
            return Convert.ToBase64String(cipherTextBytes);
        }

public string DecryptString(string cipherText)
        {
            if (string.IsNullOrEmpty(cipherText)) return null;

            byte[] initVectorBytes = Encoding.ASCII.GetBytes(initVector);
            byte[] cipherTextBytes = Convert.FromBase64String(cipherText);
            PasswordDeriveBytes password = new PasswordDeriveBytes(PASS_PHRASE, null);
            byte[] keyBytes = password.GetBytes(keysize / 8);
            RijndaelManaged symmetricKey = new RijndaelManaged();
            symmetricKey.Mode = CipherMode.CBC;
            ICryptoTransform decryptor = symmetricKey.CreateDecryptor(keyBytes, initVectorBytes);
            MemoryStream memoryStream = new MemoryStream(cipherTextBytes);
            CryptoStream cryptoStream = new CryptoStream(memoryStream, decryptor, CryptoStreamMode.Read);
            byte[] plainTextBytes = new byte[cipherTextBytes.Length];
            int decryptedByteCount = cryptoStream.Read(plainTextBytes, 0, plainTextBytes.Length);
            memoryStream.Close();
            cryptoStream.Close();
            return Encoding.UTF8.GetString(plainTextBytes, 0, decryptedByteCount);
        }

Answer 1

这是我在Java项目中用于加密/解密的一些代码。它使用AES作为加密算法，但是您应该能够找出将其与其他算法结合使用所需的更改。这些方法之外，还可以对base64进行编码/解码。

public static byte[] encryptAes(byte[] messageBytes, byte[] keyBytes, byte[] ivBytes) {
    try {
        IvParameterSpec iv = new IvParameterSpec(ivBytes);
        SecretKeySpec skeySpec = new SecretKeySpec(keyBytes, "AES");

        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
        cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);

        byte[] encrypted = cipher.doFinal(messageBytes);
        return encrypted;
    } catch (Exception ex) {
        ex.printStackTrace();
    }

    return null;
}


public static byte[] decryptAes(byte[] messageBytes, byte[] keyBytes, byte[] ivBytes) {
    try {
        IvParameterSpec iv = new IvParameterSpec(ivBytes);
        SecretKeySpec skeySpec = new SecretKeySpec(keyBytes, "AES");

        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
        cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);

        byte[] original = cipher.doFinal(messageBytes);
        return original;
    } catch (Exception ex) {
        ex.printStackTrace();
    }

    return null;
}

无论如何，您可以在这里找到越来越多的特定信息： https://docs.oracle.com/javase/7/docs/api/javax/crypto/package-summary.html

相当于Java android中的CryptoStream .NET？

1 个答案: