我收到的'要解密的数据长度无效。'尝试解密字符串时出错。我在这个网站上查看了其他一些对此错误的引用,并尝试了一些在那里找到的建议,但到目前为止没有任何工作。
我确信我遗漏了一些基本的东西,但我看不出它是什么。
我在加密和解密时使用相同的密钥和IV。我在加密和解密时添加了FlushFinalBlock()
个调用。我甚至试图设置encryptStream.Position = 0
,但是会抛出ObjectDisposedException
。
我创建了一个说明问题的控制台应用程序。代码完整如下:
using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;
namespace Crypto
{
class Program
{
static void Main(string[] args)
{
_CryptoString = AESStringEncryption(CRYPTO_STRING);
_CryptoString = AESStringDecryption(_CryptoString);
}
private const string CRYPTO_STRING = "The quick brown fox jumped over the lazy dog.";
private static byte[] _KY = { 47, 53, 94, 65, 243, 197, 42, 80, 125, 255, 144, 41, 130, 76, 2, 142, 43, 1, 120, 124, 255, 248, 232, 139, 170, 42, 243, 52, 4, 17, 60, 174 };
private static byte[] _VI = { 68, 42, 157, 47, 99, 8, 174, 169, 119, 255, 144, 218, 8, 30, 60, 42 };
private static string _CryptoString;
/// <summary>
/// Applies .NET Framework AES (Advanced Encryption Standard) Level encryption to the provided string parameter.
/// Utilizies the UTF8 encoding stardard for the conversion from string to byte[].
/// </summary>
public static string AESStringEncryption(string unencryptedString)
{
byte[] unencryptedBytes = Encoding.UTF8.GetBytes(unencryptedString);
byte[] encryptedBytes = AESByteArrayEncryption(unencryptedBytes);
string encryptedString = Encoding.UTF8.GetString(encryptedBytes);
return encryptedString;
}
/// <summary>
/// Applies .NET Framework AES (Advanced Encryption Standard) Level decryption to the provided string parameter.
/// Utilizies the UTF8 encoding stardard for the conversion from byte[] to string.
/// </summary>
public static string AESStringDecryption(string encryptedString)
{
byte[] encryptedBytes = Encoding.UTF8.GetBytes(encryptedString);
byte[] decryptedBytes = AESByteArrayDecryption(encryptedBytes);
string decryptedString = Encoding.UTF8.GetString(decryptedBytes);
return decryptedString;
}
/// <summary>
/// Applies .NET Framework AES (Advanced Encryption Standard) Level encryption to the provided byte array parameter.
/// </summary>
public static byte[] AESByteArrayEncryption(byte[] unencryptedBytes)
{
using (var rm = new RijndaelManaged())
{
var encryptor = rm.CreateEncryptor(_KY, _VI);
using (var encryptStream = new MemoryStream())
{
using (var cryptoStream = new CryptoStream(encryptStream, encryptor, CryptoStreamMode.Write))
{
cryptoStream.Write(unencryptedBytes, 0, unencryptedBytes.Length);
cryptoStream.FlushFinalBlock();
}
//encryptStream.Position = 0;
byte[] encryptedBytes = encryptStream.ToArray();
return encryptedBytes;
}
}
}
/// <summary>
/// Applies .NET Framework AES (Advanced Encryption Standard) Level decryption to the provided byte array parameter.
/// </summary>
public static byte[] AESByteArrayDecryption(byte[] encryptedBytes)
{
using (var rm = new RijndaelManaged())
{
var decryptor = rm.CreateDecryptor(_KY, _VI);
using (var decryptStream = new MemoryStream())
{
using (var cryptoStream = new CryptoStream(decryptStream, decryptor, CryptoStreamMode.Write))
{
cryptoStream.Write(encryptedBytes, 0, encryptedBytes.Length);
cryptoStream.FlushFinalBlock();
}
//decryptStream.Position = 0;
byte[] decryptedBytes = decryptStream.ToArray();
return decryptedBytes;
}
}
}
}
}
答案 0 :(得分:7)
你不能将二进制数组转换为UTF-8 - 它们不是同一个东西。改为使用Base64。
在加密方法中,倒数第二行应为:
string encryptedString = Convert.ToBase64String(encryptedBytes);
而解密方法,第一行是:
byte[] encryptedBytes = Convert.FromBase64String(encryptedString);