AES解密不返回原始值

Question

我已经编写了一个SecurityExtensions静态类来处理使用AES CBC 128位的加密

public static class SecurityExtensions
{
private static Aes GetAes(string keyText, byte[] iv)
{
var key = keyText.ToByteArray();
using var result = Aes.Create();
result.Mode = CipherMode.CBC;
result.Padding = PaddingMode.Zeros;
result.KeySize = 128;
if (iv.Length > 0)
{
result.IV = iv;
}
result.Key = key;
return result;
}
public static AesEncryptionInfo EncryptWithAes(this string plainText, string keyText)
{
var aesAlg = GetAes(keyText, new byte[0]);
var encryptor = aesAlg.CreateEncryptor(aesAlg.Key, aesAlg.IV);
byte[] encrypted;
using (var msEncrypt = new MemoryStream())
{
using (var csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
{
using (var swEncrypt = new StreamWriter(csEncrypt))
{
swEncrypt.Write(plainText);
}
encrypted = msEncrypt.ToArray();
}
}
var result = new AesEncryptionInfo(encrypted, aesAlg.IV);
return result;
}
public static string DecryptFromAes(this byte[] cipherText, string keyText, byte[] iv)
{
var aesAlg = GetAes(keyText, iv);
var decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);
// Create the streams used for decryption.
using (MemoryStream msDecrypt = new MemoryStream(cipherText))
{
using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
{
using (StreamReader srDecrypt = new StreamReader(csDecrypt))
{
var result = srDecrypt.ReadToEnd();
return result;
}
}
}
}
}

除非我有结果，否则会崩溃。Padding=PaddingMode.Zeros行(这不在我用作基础的MS示例中(

当我使用如下扩展时，原始值不会返回

const string key = "test1234test1234";
var textToEncrypt = "TESTING ENCRYPTION";
var actualEncryptionInfo = textToEncrypt.EncryptWithAes(key);
var decryptedText = actualEncryptionInfo.Encrypted.DecryptFromAes(key, actualEncryptionInfo.InversionVector);

我做错了什么？

AesEncryptionInfo是一个简单的类，它保存加密值和IV

公共类AesEncryptionInfo{public AesEncryptionInfo(byte[]加密，byte[]inversionVector({InversionVector=反转向量；加密=加密；

}
public byte[] InversionVector { get; set; }
public byte[] Encrypted { get; set; }
}

Paul

Answer 1

您正在用GetAes方法中的using语句处理Aes实例。

更改：

using var result = Aes.Create();

至：

var result = Aes.Create();

并对DecryptFromAes和EncryptWithAes中的Aes进行了处理。

using var aesAlg = GetAes(keyText, new byte[0]);
using var aesAlg = GetAes(keyText, iv);