需要用到AES256加密，但是用C#加密出来后跟对方的结果对不上，所以需要把对方提供的原java版本的加密方法转成C#的，对java的代码不太熟悉，请问有人能帮忙转一下吗

java的代码是:

package com.dadimedia.hamc;

import java.io.UnsupportedEncodingException;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.Security;
import java.security.spec.InvalidKeySpecException;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.SecretKeySpec;

import org.bouncycastle.jce.provider.BouncyCastleProvider;


/**
 * AES加解密工具类
 */
public class AES {
    private static final String KEY_GENERATION_ALG = "PBKDF2WithHmacSHA1";
    private static final int HASH_ITERATIONS = 10000;
    private static final int KEY_LENGTH = 256;
    private static byte[] salt = { 1, 3, 9, 6, 9, 4, 4, 4, 0, 2, 0xA, 0xB, 0xC, 0xD, 0xE, 0xF };
    private static final String CIPHERMODEPADDING = "AES/CBC/PKCS5Padding";
    private static IvParameterSpec ivSpec = new IvParameterSpec(new byte[] { 0xA, 1, 0xB, 5, 4, 0xF, 7, 9, 0x17, 3, 1, 6, 8, 0xC, 0xD, 91 });
    static {
        Security.addProvider(new BouncyCastleProvider());
    }
    public static void main(String[] args) {
        for (int i = 0; i < 1; i++) {
            String s = "lhdV+wj177YyjirsxeikaNestM/YafgOxrpiGbMVxzvefarFNbQfGHXauqmTIJk+upexqehjv8xK+mlx2SbnDg==" + System.currentTimeMillis();
            String key = "wandayuanxian100008";
            String t = "";
            try {
                t = AES.encrypt(s.getBytes("UTF-8"), key);
            } catch (UnsupportedEncodingException e1) {
                // TODO Auto-generated catch block
                e1.printStackTrace();
            }
            try {
                System.out.println(t);
                String de = AES.decrypt(t, key);
                System.out.println(de);
            } catch (Exception e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }

    public static SecretKeyFactory createSecretKeyFactory() {
        try {
            SecretKeyFactory keyfactory = SecretKeyFactory.getInstance(AES.KEY_GENERATION_ALG);
            return keyfactory;
        } catch (NoSuchAlgorithmException e) {
            System.out.println("no key factory support for PBEWITHSHAANDTWOFISH-CBC");
        }
        return null;

    }

    public static SecretKeySpec aesKeyConvert(String key) {
        try {
            PBEKeySpec myKeyspec = new PBEKeySpec(key.toCharArray(), AES.salt, AES.HASH_ITERATIONS, AES.KEY_LENGTH);
            SecretKeyFactory keyfactory = createSecretKeyFactory();
            SecretKey sk = keyfactory.generateSecret(myKeyspec);
            byte[] skAsByteArray = sk.getEncoded();
            SecretKeySpec skforAES = new SecretKeySpec(skAsByteArray, "AES");
            return skforAES;
        } catch (InvalidKeySpecException ikse) {
            System.out.println("invalid key spec for PBEWITHSHAANDTWOFISH-CBC");
        }
        return null;
    }

    public static String encrypt(byte[] plaintext, String password) {
        Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
        SecretKeySpec skforAES = aesKeyConvert(password);
        byte[] ciphertext = encrypt(AES.CIPHERMODEPADDING, skforAES, AES.ivSpec, plaintext);
//        try {
//            System.out.println("加密原串为：" + new String(ciphertext, "UTF-8"));
//        } catch (UnsupportedEncodingException e) {
//            e.printStackTrace();
//        }
        String base64_ciphertext = Base64Encoder.encode(ciphertext);
        return base64_ciphertext;
    }

    public static String decrypt(String ciphertext_base64, String password) {
        Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
        byte[] s = Base64Decoder.decodeToBytes(ciphertext_base64);
        SecretKeySpec skforAES = aesKeyConvert(password);
        String decrypted = new String(decrypt(AES.CIPHERMODEPADDING, skforAES, AES.ivSpec, s));
        return decrypted;
    }

    public static String decrypt(byte[] data, String password) {
        Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
        SecretKeySpec skforAES = aesKeyConvert(password);
        String decrypted = new String(decrypt(AES.CIPHERMODEPADDING, skforAES, AES.ivSpec, data));
        return decrypted;
    }

    /**
     * 加密
     * 
     * @param cmp
     *            填充方式
     * @param sk
     *            密钥
     * @param IV
     *            向量
     * @param msg
     *            需要加密的内容
     * @return 返回加密结果
     */
    public static byte[] encrypt(String cmp, SecretKey sk, IvParameterSpec IV, byte[] msg) {
        try {
            Cipher c = Cipher.getInstance(cmp);
            c.init(Cipher.ENCRYPT_MODE, sk, IV);
            return c.doFinal(msg);
        } catch (NoSuchAlgorithmException e) {
            System.out.println(e.getMessage());
        } catch (NoSuchPaddingException e) {
            System.out.println(e.getMessage());
        } catch (InvalidKeyException e) {
            System.out.println(e.getMessage());
        } catch (InvalidAlgorithmParameterException e) {
            System.out.println(e.getMessage());
        } catch (IllegalBlockSizeException e) {
            System.out.println(e.getMessage());
        } catch (BadPaddingException e) {
            System.out.println(e.getMessage());
        }
        return null;
    }

    /**
     * 解密
     * 
     * @param cmp
     *            填充函数
     * @param sk
     *            密钥
     * @param IV
     *            向量
     * @param ciphertext
     *            需要解密内容
     * @return 返回解密结果
     */
    public static byte[] decrypt(String cmp, SecretKey sk, IvParameterSpec IV, byte[] ciphertext) {
        try {
            Cipher c = Cipher.getInstance(cmp);
            c.init(Cipher.DECRYPT_MODE, sk, IV);
            return c.doFinal(ciphertext);
        } catch (NoSuchAlgorithmException nsae) {
            System.out.println(nsae.getMessage());
        } catch (NoSuchPaddingException nspe) {
            System.out.println(nspe.getMessage());
        } catch (InvalidKeyException e) {
            System.out.println(e.getMessage());
        } catch (InvalidAlgorithmParameterException e) {
            System.out.println(e.getMessage());
        } catch (IllegalBlockSizeException e) {
            System.out.println(e.getMessage());
        } catch (BadPaddingException e) {
            System.out.println(e.getMessage());
        }
        return null;
    }
}