[英]“Padding is invalid and cannot be removed” Error while decrypting cipher text Using Aes
我想使用Aes加密/解密我的訪問令牌。 加密部分成功運行。 但是我的問題是發生以下錯誤時解密加密的訪問令牌
填充無效,無法刪除。
以下行引發異常:
using (var srDecrypt = new StreamReader(csDecrypt))
{
result = srDecrypt.ReadToEnd();
}
誰能告訴我該如何解決這個問題? (作為控制台應用程序)
class Program
{
private static string keyString = "E546C8DF278CD5931069B522E695D4F2";
static void Main(string[] args)
{
var text = "a16df7367e9eca23ac5e071dc4449a7a";
Console.WriteLine(EncryptString(text)); ;
Console.WriteLine(DecryptString(EncryptString(text)));
Console.ReadLine();
}
public static string EncryptString(string text)
{
var key = Encoding.UTF8.GetBytes(keyString);
using (var aesAlg = Aes.Create())
{
using (var encryptor = aesAlg.CreateEncryptor(key, aesAlg.IV))
{
using (var msEncrypt = new MemoryStream())
{
using (var csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
using (var swEncrypt = new StreamWriter(csEncrypt))
{
swEncrypt.Write(text);
}
var iv = aesAlg.IV;
var decryptedContent = msEncrypt.ToArray();
var result = new byte[iv.Length + decryptedContent.Length];
Buffer.BlockCopy(iv, 0, result, 0, iv.Length);
Buffer.BlockCopy(decryptedContent, 0, result, iv.Length, decryptedContent.Length);
return Convert.ToBase64String(result);
}
}
}
}
public static string DecryptString(string cipherText)
{
var fullCipher = Convert.FromBase64String(cipherText);
var iv = new byte[16];
var cipher = new byte[16];
Buffer.BlockCopy(fullCipher, 0, iv, 0, iv.Length);
Buffer.BlockCopy(fullCipher, iv.Length, cipher, 0, iv.Length);
var key = Encoding.UTF8.GetBytes(keyString);
using (var aesAlg = Aes.Create())
{
using (var decryptor = aesAlg.CreateDecryptor(key, iv))
{
string result;
using (var msDecrypt = new MemoryStream(cipher))
{
using (var csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
{
using (var srDecrypt = new StreamReader(csDecrypt))
{
result = srDecrypt.ReadToEnd();
}
}
}
return result;
}
}
}
}
你應該改變它
var iv = new byte[16];
var cipher = new byte[16];
Buffer.BlockCopy(fullCipher, 0, iv, 0, iv.Length);
Buffer.BlockCopy(fullCipher, iv.Length, cipher, 0, iv.Length);
至
var iv = new byte[16];
var cipher = new byte[fullCipher.Length - 16]; //Calculate correct byte size
Buffer.BlockCopy(fullCipher, 0, iv, 0, iv.Length);
Buffer.BlockCopy(fullCipher, iv.Length, cipher, 0, cipher.Length); //Change destination count of copied bytes
默認情況下,密碼數組大小不能為16個字節,您應該計算得出。
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