AES Decrypt string key and data - CSharp System.Security.Cryptography

CSharp examples for System.Security.Cryptography:AES

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Description

AES Decrypt string key and data

Demo Code


using System.Web;
using System.Text;
using System.Security.Cryptography;
using System.Linq;
using System.IO;/*w ww . j a  v a2  s .  c om*/
using System.Collections.Generic;
using System;

public class Main{
        public static string AESDecrypt(string data, string key)
        {
            Byte[] encryptedBytes = Convert.FromBase64String(data);
            Byte[] bKey = new Byte[32];
            Array.Copy(Encoding.UTF8.GetBytes(key.PadRight(bKey.Length)), bKey, bKey.Length);
            MemoryStream mStream = new MemoryStream(encryptedBytes);
            RijndaelManaged aes = new RijndaelManaged();
            aes.Mode = CipherMode.ECB;
            aes.Padding = PaddingMode.PKCS7;
            aes.KeySize = 128;
            aes.Key = bKey;
            CryptoStream cryptoStream = new CryptoStream(mStream, aes.CreateDecryptor(), CryptoStreamMode.Read);
            try
            {
                byte[] tmp = new byte[encryptedBytes.Length + 32];
                int len = cryptoStream.Read(tmp, 0, encryptedBytes.Length + 32);
                byte[] ret = new byte[len];
                Array.Copy(tmp, 0, ret, 0, len);
                return Encoding.UTF8.GetString(ret);
            }
            finally
            {
                cryptoStream.Close();
                mStream.Close();
                aes.Clear();
            }
        }
}

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