要解密的数据长度无效。 CryptoStream 解密字符串

Question

我有一个可以在一个站点上使用的加密和解密方法，但是在将其复制到另一个站点时，我开始收到错误消息：要解密的数据长度无效。我在网上查看了所有可以在这里找到的问题，但似乎没有一个适合我的解决方法

代码加密没有任何问题，但不能正确解密。错误发生在这一行这里

int decryptedByteCount = cryptoStream.Read(plainTextBytes,0, plainTextBytes.Length);

这只是我要解密的字符串

这里是完整的解密方法：

 public static string Decrypt(string cipherText)
    {
        string passPhrase = "@Not Real Pass";        // can be any string
        string saltValue = "@Not real salt";        // can be any string
        string hashAlgorithm = "SHA1";             // can be "MD5"
        int passwordIterations = 2;                  // can be any number
        string initVector = "@1B2c3D4e5F6g7H8"; // must be 16 bytes
        int keySize = 256;                // can be 192 or 128

        // Convert strings defining encryption key characteristics into byte
        // arrays. Let us assume that strings only contain ASCII codes.
        // If strings include Unicode characters, use Unicode, UTF7, or UTF8
        // encoding.
        byte[] initVectorBytes = Encoding.ASCII.GetBytes(initVector);
        byte[] saltValueBytes = Encoding.ASCII.GetBytes(saltValue);

        // Convert our ciphertext into a byte array.
        byte[] cipherTextBytes = Convert.FromBase64String(cipherText);

        // First, we must create a password, from which the key will be 
        // derived. This password will be generated from the specified 
        // passphrase and salt value. The password will be created using
        // the specified hash algorithm. Password creation can be done in
        // several iterations.
        PasswordDeriveBytes password = new PasswordDeriveBytes(
                                                        passPhrase,
                                                        saltValueBytes,
                                                        hashAlgorithm,
                                                        passwordIterations);

        // Use the password to generate pseudo-random bytes for the encryption
        // key. Specify the size of the key in bytes (instead of bits).
        byte[] keyBytes = password.GetBytes(keySize / 8);

        // Create uninitialized Rijndael encryption object.
        RijndaelManaged symmetricKey = new RijndaelManaged();

        // It is reasonable to set encryption mode to Cipher Block Chaining
        // (CBC). Use default options for other symmetric key parameters.
        symmetricKey.Mode = CipherMode.CBC;

        // Generate decryptor from the existing key bytes and initialization 
        // vector. Key size will be defined based on the number of the key 
        // bytes.
        ICryptoTransform decryptor = symmetricKey.CreateDecryptor(keyBytes,initVectorBytes);

        // Define memory stream which will be used to hold encrypted data.
        MemoryStream memoryStream = new MemoryStream(cipherTextBytes);

        // Define cryptographic stream (always use Read mode for encryption).
        CryptoStream cryptoStream = new CryptoStream(memoryStream,
                                                      decryptor,
                                                      CryptoStreamMode.Read);

        // Since at this point we don't know what the size of decrypted data
        // will be, allocate the buffer long enough to hold ciphertext;
        // plaintext is never longer than ciphertext.
        byte[] plainTextBytes = new byte[cipherTextBytes.Length];

        // Start decrypting.
        int decryptedByteCount = cryptoStream.Read(plainTextBytes,
                                                   0,
                                                   plainTextBytes.Length);

        // Close both streams.
        memoryStream.Close();
        cryptoStream.Close();

        // Convert decrypted data into a string. 
        // Let us assume that the original plaintext string was UTF8-encoded.
        string plainText = Encoding.UTF8.GetString(plainTextBytes,
                                                   0,
                                                   decryptedByteCount);

        // Return decrypted string.   
        return plainText;
    }
}

如果还需要加密方法，请告诉我

编辑

这里要求的是加密代码：

public static string Encrypt(string plainText)
    {
        string passPhrase = "@Not Real Password";        // can be any string
        string saltValue = "@Not Real Salt";        // can be any string
        string hashAlgorithm = "SHA1";             // can be "MD5"
        int passwordIterations = 2;                  // can be any number
        string initVector = "@1B2c3D4e5F6g7H8"; // must be 16 bytes
        int keySize = 256;                // can be 192 or 128
        // Convert strings into byte arrays.
        // Let us assume that strings only contain ASCII codes.
        // If strings include Unicode characters, use Unicode, UTF7, or UTF8 
        // encoding.
        byte[] initVectorBytes = Encoding.ASCII.GetBytes(initVector);
        byte[] saltValueBytes = Encoding.ASCII.GetBytes(saltValue);

        // Convert our plaintext into a byte array.
        // Let us assume that plaintext contains UTF8-encoded characters.
        byte[] plainTextBytes = Encoding.UTF8.GetBytes(plainText);

        // First, we must create a password, from which the key will be derived.
        // This password will be generated from the specified passphrase and 
        // salt value. The password will be created using the specified hash 
        // algorithm. Password creation can be done in several iterations.
        PasswordDeriveBytes password = new PasswordDeriveBytes(
                                                        passPhrase,
                                                        saltValueBytes,
                                                        hashAlgorithm,
                                                        passwordIterations);

        // Use the password to generate pseudo-random bytes for the encryption
        // key. Specify the size of the key in bytes (instead of bits).
        byte[] keyBytes = password.GetBytes(keySize / 8);

        // Create uninitialized Rijndael encryption object.
        RijndaelManaged symmetricKey = new RijndaelManaged();

        // It is reasonable to set encryption mode to Cipher Block Chaining
        // (CBC). Use default options for other symmetric key parameters.
        symmetricKey.Mode = CipherMode.CBC;

        // Generate encryptor from the existing key bytes and initialization 
        // vector. Key size will be defined based on the number of the key 
        // bytes.
        ICryptoTransform encryptor = symmetricKey.CreateEncryptor(
                                                         keyBytes,
                                                         initVectorBytes);

        // Define memory stream which will be used to hold encrypted data.
        MemoryStream memoryStream = new MemoryStream();

        // Define cryptographic stream (always use Write mode for encryption).
        CryptoStream cryptoStream = new CryptoStream(memoryStream,
                                                     encryptor,
                                                     CryptoStreamMode.Write);
        // Start encrypting.
        cryptoStream.Write(plainTextBytes, 0, plainTextBytes.Length);

        // Finish encrypting.
        cryptoStream.FlushFinalBlock();

        // Convert our encrypted data from a memory stream into a byte array.
        byte[] cipherTextBytes = memoryStream.ToArray();

        // Close both streams.
        memoryStream.Close();
        cryptoStream.Close();


        // Convert encrypted data into a base64-encoded string.
        string cipherText = Convert.ToBase64String(cipherTextBytes).ToString();

        //cipherText = cipherText.Replace("/", "");
        //cipherText = cipherText.Replace("\\", "");
        // Return encrypted string.
        return cipherText;
    }

再补充一点信息，我要为两个测试示例解码的字符串是 1008 和 1013，这两个在解密过程中都失败了

谢谢

Answer 1

我不确定你是如何加密你的字符串的，但是我可以看到你正在使用一个 ascii 值的字节数组，我将假设其中一些加密字符被加密为奇怪的字符可能会弄乱您返回的字符串，例如 '" ' 会导致您的字符串结束，这意味着返回的字符串可能不是正确的长度。

也许确实显示您的加密方法，我们可以确定。