C＃相当于DecryptByPassPhrase

Question

我需要使用EncryptByPassPhrase解密在数据库上加密的值，但不能访问数据库。

如何从密码短语中获取加密密钥？

我看了

Replicate T-SQL DecryptByPassPhrase in C#

和

C# Decrypt bytes from SQL Server EncryptByPassPhrase?

我的代码是：

public static string AESDatabaseDecrypt(string encryptedString)
{
    passphrase =     "S0meFakePassPhrase01234!";
    encryptedString = "AQAAAOmuc52dnbVwTqEx1kp+4WhI89LYKHh3jg=="; // temporarily hard coded


    // setup encryption settings to match decryptbypassphrase
    TripleDESCryptoServiceProvider provider = new TripleDESCryptoServiceProvider();
    provider.Key = UTF8Encoding.UTF8.GetBytes(passphrase).Take(16).ToArray(); // stuck on getting key from passphrase
    provider.KeySize = 128;
    provider.Padding = PaddingMode.Zeros;
    // setup data to be decrypted
    byte[] encryptedStringAsByteArray = Convert.FromBase64String(encryptedString);

    // hack some extra bytes up to a multiple of 8
    encryptedStringAsByteArray = encryptedStringAsByteArray.Concat(new byte[] { byte.MinValue, byte.MinValue, byte.MinValue, byte.MinValue }).ToArray(); // add 4 empty bytes to make 32 bytes
    MemoryStream encryptedStringAsMemoryStream = new MemoryStream(encryptedStringAsByteArray);
    // decrypt
    CryptoStream cryptoStream = new CryptoStream(encryptedStringAsMemoryStream, provider.CreateDecryptor(), CryptoStreamMode.Read);
    // return the result
    StreamReader cryptoStreamReader = new StreamReader(cryptoStream);
    string decryptedString = cryptoStreamReader.ReadToEnd();
}

Answer 1

嗯，我的意思是，跳出来的第一件事就是你实际上并没有从你的方法中返回一个值。尝试将return decryptedString;添加到最后，看看你得到了什么。