C#与java中的AES加解密互解算法

一、C#版AES加解密算法

   public class AESCode 
    {
        public string Key { get; set; }

        public string Encrypt(string val)
        {
            if (string.IsNullOrEmpty(val))
                return null;
#if CSP
            using (AesCryptoServiceProvider des = new AesCryptoServiceProvider())
#else
            using (AesManaged des = new AesManaged())
#endif
            {
                byte[] inputByteArray = Encoding.UTF8.GetBytes(val);
                byte[] _key;
                byte[] _iv;
                GeneralKeyIV(this.Key, out _key, out _iv);
                des.Key = _key;
                des.IV = _iv;
                using (MemoryStream ms = new MemoryStream())
                {
                    using (CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write))
                    {
                        cs.Write(inputByteArray, 0, inputByteArray.Length);
                        cs.FlushFinalBlock();
                        byte[] bytes = (byte[])ms.ToArray();
                        return Convert.ToBase64String(bytes);
                    }
                }
            }
        }

        public string Decrypt(string val)
        {
            if (string.IsNullOrEmpty(val))
                return null;
#if CSP
            using (AesCryptoServiceProvider des = new AesCryptoServiceProvider())
#else
            using (AesManaged des = new AesManaged())
#endif
            {
                byte[] inputByteArray = Convert.FromBase64String(val);
                byte[] _key;
                byte[] _iv;
                GeneralKeyIV(this.Key, out _key, out _iv);
                des.Key = _key;
                des.IV = _iv;
                using (MemoryStream ms = new MemoryStream())
                {
                    using (CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write))
                    {
                        cs.Write(inputByteArray, 0, inputByteArray.Length);
                        cs.FlushFinalBlock();
                        return Encoding.UTF8.GetString(ms.ToArray());
                    }
                }
            }
        }

        public void GeneralKeyIV(string keyStr, out byte[] key, out byte[] iv)
        {
            byte[] bytes = Encoding.UTF8.GetBytes(keyStr);
            key = SHA256Managed.Create().ComputeHash(bytes);
            iv = MD5.Create().ComputeHash(bytes);
        }
}

二、Java版算法

import java.security.MessageDigest;
import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

import org.apache.commons.codec.binary.Base64;

public class AESCode {
/**
     * 提供密钥和向量进行加密
     * 
     * @param sSrc
     * @param key
     * @param iv
     * @return
     * @throws Exception
     */
    public static String Encrypt(String sSrc, byte[] key, byte[] iv) throws Exception {
        SecretKeySpec skeySpec = new SecretKeySpec(key, "AES");
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");// "算法/模式/补码方式"
        IvParameterSpec _iv = new IvParameterSpec(iv);// 使用CBC模式，需要一个向量iv，可增加加密算法的强度
        cipher.init(Cipher.ENCRYPT_MODE, skeySpec, _iv);
        byte[] encrypted = cipher.doFinal(sSrc.getBytes("utf-8"));
        return Base64.encodeBase64String(encrypted);
    }

    /**
     * 提供密钥和向量进行解密
     * 
     * @param sSrc
     * @param key
     * @param iv
     * @return
     * @throws Exception
     */
    public static String Decrypt(String sSrc, byte[] key, byte[] iv) throws Exception {
        SecretKeySpec skeySpec = new SecretKeySpec(key, "AES");
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        IvParameterSpec _iv = new IvParameterSpec(iv);
        cipher.init(Cipher.DECRYPT_MODE, skeySpec, _iv);
        byte[] encrypted = Base64.decodeBase64(sSrc);
        byte[] original = cipher.doFinal(encrypted);
        return new String(original, "utf-8");
    }

    /**
     * 使用密钥进行加密
     * 
     * @param sSrc
     * @param keyStr
     * @return
     * @throws Exception
     */
    public static String Encrypt(String sSrc, String keyStr) throws Exception {
        byte[] key = GeneralKey(keyStr);
        byte[] iv = GeneralIv(keyStr);
        SecretKeySpec skeySpec = new SecretKeySpec(key, "AES");
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");// "算法/模式/补码方式"
        IvParameterSpec _iv = new IvParameterSpec(iv);
        cipher.init(Cipher.ENCRYPT_MODE, skeySpec, _iv);
        byte[] encrypted = cipher.doFinal(sSrc.getBytes("utf-8"));
        return Base64.encodeBase64String(encrypted);
    }

    /**
     * 使用密钥进行解密
     * 
     * @param sSrc
     * @param keyStr
     * @return
     * @throws Exception
     */
    public static String Decrypt(String sSrc, String keyStr) throws Exception {
        byte[] key = GeneralKey(keyStr);
        byte[] iv = GeneralIv(keyStr);
        SecretKeySpec skeySpec = new SecretKeySpec(key, "AES");
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        IvParameterSpec _iv = new IvParameterSpec(iv);
        cipher.init(Cipher.DECRYPT_MODE, skeySpec, _iv);
        byte[] encrypted = Base64.decodeBase64(sSrc);// 先用base64解码
        byte[] original = cipher.doFinal(encrypted);
        return new String(original, "utf-8");
    }

    /**
     * 构建密钥字节码
     * 
     * @param keyStr
     * @return
     * @throws Exception
     */
    private static byte[] GeneralKey(String keyStr) throws Exception {
        byte[] bytes = keyStr.getBytes("utf-8");
        MessageDigest md = MessageDigest.getInstance("SHA-256");
        md.update(bytes);
        return md.digest();
    }

    /**
     * 构建加解密向量字节码
     * 
     * @param keyStr
     * @return
     * @throws Exception
     */
    private static byte[] GeneralIv(String keyStr) throws Exception {
        byte[] bytes = keyStr.getBytes("utf-8");
        MessageDigest md = MessageDigest.getInstance("MD5");
        md.update(bytes);
        return md.digest();
    }
}

java版需要commons-codec-1.10.jar,local_policy.jar,US_export_policy.jar