[英]AES to encrypt a single block shows error
當在程序下面運行它顯示錯誤。
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;
using System.Security.Cryptography;
using System.Web.UI.WebControls;
using System.Configuration;
using System.Text;
namespace Rextester
{
public class Program
{
public static void Main(string[] args)
{
//Your code goes here
Console.WriteLine("Hello, world!");
byte[] plainText = UTF8Encoding.UTF8.GetBytes("textt");
byte[] key = UTF8Encoding.UTF8.GetBytes("1234567890123456");
AES_encrypt_block(plainText,key);
}
private static byte[] AES_encrypt_block(byte[] plainText, byte[] Key)
{
byte[] output_buffer = new byte[plainText.Length];
using (AesManaged aesAlg = new AesManaged())
{
//If CBC, must initialize IV = O_{128}
//aesAlg.Mode = CipherMode.CBC;
//aesAlg.IV = new byte[] { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
aesAlg.Mode = CipherMode.ECB;
aesAlg.BlockSize = 128;
aesAlg.KeySize = 128;
aesAlg.Padding = PaddingMode.None;
aesAlg.Key = Key;
// Create a decrytor to perform the stream transform.
ICryptoTransform encryptor = aesAlg.CreateEncryptor(aesAlg.Key, aesAlg.IV);
encryptor.TransformBlock(plainText, 0, plainText.Length, output_buffer, 0);
}
return output_buffer;
}
}
}
錯誤
用戶代碼中的異常:
System.ArgumentException:值無效。 at> System.Security.Cryptography.RijndaelManagedTransform.TransformBlock(Byte []> inputBuffer,Int32 inputOffset,Int32 inputCount,Byte [] outputBuffer,Int32> outputOffset)at Rextester.Program.AES_encrypt_block(Byte [] plainText,Byte [] Key)在Rextester.Program.Main(String [] args)“
你可以這樣做(例子)。 但我建議使用CBC而不是ECB。 並且,由於填充,解密的塊將始終具有塊的大小,即使原始內容(5字節字符串)更短。 因此,在創建字符串時,請在實際內容之前插入字符串長度(第2個示例)。
加密/解密ECB:
private static AesManaged Create(byte[] key)
{
var aes = new AesManaged();
aes.Mode = CipherMode.ECB;
aes.BlockSize = 128;
aes.KeySize = 128;
aes.Padding = PaddingMode.Zeros;
aes.Key = key;
return aes;
}
private static byte[] AES_encrypt_block(byte[] plainText, byte[] key)
{
using (AesManaged aes = Create(key))
{
var encryptor = aes.CreateEncryptor(aes.Key, aes.IV);
return encryptor.TransformFinalBlock(plainText, 0, plainText.Length);
}
}
private static byte[] AES_decrypt_block(byte[] plainText, byte[] key)
{
using (AesManaged aesAlg = Create(key))
{
var decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);
return decryptor.TransformFinalBlock(plainText, 0, plainText.Length);
}
}
串到字節:
private static byte[] StringToBytes(string s)
{
var length = BitConverter.GetBytes(s.Length);
var raw = Encoding.UTF8.GetBytes(s);
var full = new byte[sizeof(int) + raw.Length];
Array.Copy(length, full, sizeof(int));
Array.Copy(raw, 0, full, sizeof(int), raw.Length);
return full;
}
private static string BytesToString(byte[] input)
{
var length = BitConverter.ToInt32(input, 0);
return Encoding.UTF8.GetString(input, sizeof(int), length);
}
驗證:
var key = UTF8Encoding.UTF8.GetBytes("1234567890123456");
var plainBytes = StringToBytes("textt");
var encryptedBytes = AES_encrypt_block(plainBytes, key);
var decryptedBytes = AES_decrypt_block(encryptedBytes, key);
var decryptedString = BytesToString(decryptedBytes);
你應該改變它;
encryptor.TransformBlock(plainText, 0, plainText.Length, output_buffer, 0);
至
var output = encryptor.TransformFinalBlock(plainText, 0, plainText.Length);
你應該指定PaddingMode
;
aesAlg.Padding = PaddingMode.PKCS7;
整個方法看起來像;
private static byte[] AES_encrypt_block(byte[] plainText, byte[] Key)
{
using (AesManaged aesAlg = new AesManaged())
{
aesAlg.Mode = CipherMode.ECB;
aesAlg.BlockSize = 128;
aesAlg.KeySize = 128;
aesAlg.Padding = PaddingMode.PKCS7;
aesAlg.Key = Key;
// Create a decrytor to perform the stream transform.
ICryptoTransform encryptor = aesAlg.CreateEncryptor(aesAlg.Key, aesAlg.IV);
return encryptor.TransformFinalBlock(plainText, 0, plainText.Length);
}
}
如果使用TransformBlock
,則輸入文本長度應為16
。 因為它改變了每個塊的加密。 因此,您應該使用TransformFinalBlock
而不是它。 此外,應為較短的消息數據塊設置PaddingMode
。
編輯
執行解密 ;
private static byte[] AES_Decrypt_block(byte[] cipherText, byte[] Key)
{
using (AesManaged aesAlg = new AesManaged())
{
aesAlg.Mode = CipherMode.ECB;
aesAlg.BlockSize = 128;
aesAlg.KeySize = 128;
aesAlg.Padding = PaddingMode.PKCS7;
aesAlg.Key = Key;
ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);
return decryptor.TransformFinalBlock(cipherText, 0, cipherText.Length);
}
}
用法
byte[] plainText = UTF8Encoding.UTF8.GetBytes("textt");
byte[] key = UTF8Encoding.UTF8.GetBytes("1234567890123456");
var encrypted = AES_encrypt_block(plainText, key);
var decrypted = AES_Decrypt_block(encrypted, key);
Console.WriteLine(UTF8Encoding.UTF8.GetString(decrypted));
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