[英]Error AES - Standard SymmetricAlgorithm, “Padding is invalid and cannot be removed”
我正在使用AES - Standard SymmetricAlgorithm,
來加密和解密字符串。 字符串正在成功加密,但是在解密時,編譯器給了我一個例外,即
“填充無效,無法刪除”。
我已經創建了一個用於測試的演示控制台應用程序,請查看下面的代碼。
主要方法:
static void Main(string[] args)
{
var content = "5466160057107706";
var key = "E546C8DF278CD5931069B522E695D4F2";
var encrypted = EncryptString(content, key);
Console.WriteLine(encrypted);
var decrypted = DecryptString(encrypted, key);
Console.WriteLine(decrypted);
Console.ReadLine();
}
添加的加密方法:
public static string EncryptString(string text, string keyString)
{
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);
}
}
}
}
添加的解密方法:
public static string DecryptString(string cipherText, string keyString)
{
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;
}
}
}
這是在DecryptString()
方法中發生的錯誤捕捉:
有什么建議,如何解決這個問題?
提示: var cipher = new byte[16];
為什么要假設密碼只有16個字節? 如果還不止如此呢?
實際上,如果我運行該程序並進行調試,則會看到您的密碼為32字節。
因此,以下兩行更改使其起作用:
var cipher = new byte[32];
Buffer.BlockCopy(fullCipher, iv.Length, cipher, 0, cipher.Length);
無論如何,您都需要動態確定密碼的大小。
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