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我看到存在的有关此主题的另一个问题,但我检查每一个问题,我解决不了我的问题.. 这是我的方法来解密和其他方法来调用解密方法用所需参数:填充是无效的,不能被C#去除解密
public string Decrypt(AesOperationType operationType, byte[] criptotext, byte[] Key, byte[] initVector)
{
string plaintext = null;
using (Aes aesAlg = Aes.Create())
{
aesAlg.KeySize = 128;
aesAlg.Key = Key;
aesAlg.IV = initVector;
if (operationType == AesOperationType.Cbc)
{
aesAlg.Mode = CipherMode.CBC;
}
else if (operationType == AesOperationType.Cfb)
{
aesAlg.Mode = CipherMode.ECB;
}
//apelam functia de decriptare
ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);
using (MemoryStream msDecrypt = new MemoryStream(criptotext))
using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
{
using (StreamReader srDecrypt = new StreamReader(csDecrypt))
{
plaintext = srDecrypt.ReadToEnd();
}
}
}
Console.WriteLine("Start decrypt for criptotext : " + BitConverter.ToString(criptotext) + "\n");
Console.WriteLine("Plaintext after decrypt : " + plaintext + "\n");
return plaintext;
}
public byte[] Encrypt_Call()
{
var key = "1212121212121212";
var key_byte = Encoding.ASCII.GetBytes(key);
using (Aes aess = Aes.Create())
{
var iv = aess.IV;
cryptdecrypt object = new cryptdecrypt();
var result = object.Encrypt(AesOperationType.Cbc, "plaintext", key_byte, iv);
return result;
}
}
public void Decrypt_Call()
{
var key = "1212121212121212";
var key_byte = Encoding.ASCII.GetBytes(key);
using (Aes aess = Aes.Create())
{
var iv = aess.IV;
cryptdecrypt object = new cryptdecrypt();
var cryptotext = Encrypt_Call();
var result = object.Decrypt(AesOperationType.Cbc, cryptotext , key_byte, iv);
}
}
加密方法工作得很好,但在解密方法调用,我面对这样的错误:
Padding is invalid and cannot be removed.
我也试图把csDecrypt.FlushFinalBlock()
这行之前该行:
using (StreamReader srDecrypt = new StreamReader(csDecrypt))
错误消失,因此我得到一个空字符串。
任何想法来解决这个问题?
IV在哪里指定? – zaph
您必须使用相同的密钥*和* IV进行加密和解密。看起来你可能在加密和解密方法中随机生成IV,因此它们不会相同。 – Iridium
@KurokawaMasato AesOperationType是一个类,其中包含一个与Cbc,Cfb ..枚举的枚举 – Carto