如何使用AES算法进行加密

我给出了一个.key（abc.key）文件。使用上面的.key文件，加密和解密是用Java完成的。在这里，我需要使用C#.net.实现相同的加密和解密功能

请告诉我如何破解这个。我是这些密码学的新手。

下面是他们在java中设置的一些参数。希望它能给一点想法

    String keyFile="abc.key";
    String keyAlgorithm= "AES";
    String cipherTransformation="AES/CBC/PKCS5Padding";
    String needtoEncStr = "Password1";

任何帮助都将不胜感激。

更新：

@daveBM:我使用了bouncycastle，但得到了不同的结果（和java输出不一样）。下面是我的完整代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Crypto.Engines;
using Org.BouncyCastle.Crypto.Generators;
using Org.BouncyCastle.Crypto.Modes;
using Org.BouncyCastle.Crypto.Paddings;
using Org.BouncyCastle.Crypto.Parameters;
using Org.BouncyCastle.Security;
using Org.BouncyCastle.Utilities.Encoders;
public class BCEngine
{
    private readonly Encoding _encoding;
    private readonly IBlockCipher _blockCipher;
    private PaddedBufferedBlockCipher _cipher;
    private IBlockCipherPadding _padding;
    public BCEngine(IBlockCipher blockCipher, Encoding encoding)
    {
        _blockCipher = blockCipher;
        _encoding = encoding;
    }
    public void SetPadding(IBlockCipherPadding padding)
    {
        if (padding != null)
            _padding = padding;
    }
    public string Encrypt(string plain, string key)
    {
        byte[] result = BouncyCastleCrypto(true, _encoding.GetBytes(plain), key);
        return Convert.ToBase64String(result);
    }
    public string Decrypt(string cipher, string key)
    {
        byte[] result = BouncyCastleCrypto(false, Convert.FromBase64String(cipher), key);
        return _encoding.GetString(result);
    }
    /// <summary>
    ///
    /// </summary>
    /// <param name="forEncrypt"></param>
    /// <param name="input"></param>
    /// <param name="key"></param>
    /// <returns></returns>
    /// <exception cref="CryptoException"></exception>
    private byte[] BouncyCastleCrypto(bool forEncrypt, byte[] input, string key)
    {
        try
        {
            _cipher = _padding == null ? new PaddedBufferedBlockCipher(_blockCipher) : new PaddedBufferedBlockCipher(_blockCipher, _padding);
            byte[] keyByte = _encoding.GetBytes(key);
            _cipher.Init(forEncrypt, new KeyParameter(keyByte));
            return _cipher.DoFinal(input);
        }
        catch (Org.BouncyCastle.Crypto.CryptoException ex)
        {
            throw new CryptoException(ex.Message);
        }
    }
}

static void Main(string[] args)
        {
            Encoding _encoding;
            IBlockCipherPadding _padding;
            string key = "abc.key";
            Stream inStr = null;
            inStr = File.OpenRead(key);
            Stream stream = inStr;
            byte[] bytes = new byte[stream.Length];
            stream.Position = 0;
            stream.Read(bytes, 0, (int)stream.Length);
            string data1 = Encoding.UTF8.GetString(bytes); // this is your string.

            _encoding = Encoding.ASCII;
            Pkcs7Padding pkcs = new Pkcs7Padding();
            _padding = pkcs;  
            BCEngine bcEngine = new BCEngine(new AesEngine(), _encoding);
            bcEngine.SetPadding(_padding);
            string data=bcEngine.Encrypt("AbcDefg12$", data1);
        }

当我的预期输出是"3df36eb77ccfc05e264a612c2db5380"时，我得到了这个输出"S2jjjvVJVKfGodPfMuI4v+g=="。。。请告诉我出了什么问题。