AES加密解密通用版Object-C / C# / JAVA

1.无向量 128位

 /// <summary>
        /// AES加密(无向量)
        /// </summary>
        /// <param name="plainBytes">被加密的明文</param>
        /// <param name="key">密钥</param>
        /// <returns>密文</returns>
        public static string AESEncrypt(String Data, String Key)
        {
            MemoryStream mStream = new MemoryStream();
            RijndaelManaged aes = new RijndaelManaged();

            byte[] plainBytes = Encoding.UTF8.GetBytes(Data);
            Byte[] bKey = new Byte[];
            Array.Copy(Encoding.UTF8.GetBytes(Key.PadRight(bKey.Length)), bKey, bKey.Length);

            aes.Mode = CipherMode.ECB;
            aes.Padding = PaddingMode.PKCS7;
            aes.KeySize = ;
            //aes.Key = _key;
            aes.Key = bKey;
            //aes.IV = _iV;
            CryptoStream cryptoStream = new CryptoStream(mStream, aes.CreateEncryptor(), CryptoStreamMode.Write);
            try
            {
                cryptoStream.Write(plainBytes, , plainBytes.Length);
                cryptoStream.FlushFinalBlock();
                return Convert.ToBase64String(mStream.ToArray());
            }
            finally
            {
                cryptoStream.Close();
                mStream.Close();
                aes.Clear();
            }
        }

  /// AES解密(无向量)
        /// </summary>
        /// <param name="encryptedBytes">被加密的明文</param>
        /// <param name="key">密钥</param>
        /// <returns>明文</returns>
        public static string AESDecrypt(String Data, String Key)
        {
            Byte[] encryptedBytes = Convert.FromBase64String(Data);
            Byte[] bKey = new Byte[];
            Array.Copy(Encoding.UTF8.GetBytes(Key.PadRight(bKey.Length)), bKey, bKey.Length);

            MemoryStream mStream = new MemoryStream(encryptedBytes);
            //mStream.Write( encryptedBytes, 0, encryptedBytes.Length );
            //mStream.Seek( 0, SeekOrigin.Begin );
            RijndaelManaged aes = new RijndaelManaged();
            aes.Mode = CipherMode.ECB;
            aes.Padding = PaddingMode.PKCS7;
            aes.KeySize = ;
            aes.Key = bKey;
            //aes.IV = _iV;
            CryptoStream cryptoStream = new CryptoStream(mStream, aes.CreateDecryptor(), CryptoStreamMode.Read);
            try
            {
                byte[] tmp = new byte[encryptedBytes.Length + ];
                int len = cryptoStream.Read(tmp, , encryptedBytes.Length + );
                byte[] ret = new byte[len];
                Array.Copy(tmp, , ret, , len);
                return Encoding.UTF8.GetString(ret);
            }
            finally
            {
                cryptoStream.Close();
                mStream.Close();
                aes.Clear();
            }
        }

2. 256位 通用版 JAVA / C# / Object-C

 /// <summary>
        ///  AES 加密
        /// </summary>
        /// <param name="str"></param>
        /// <param name="key"></param>
        /// <returns></returns>
        public static string AesEncrypt(string str, string key)
        {
            if (string.IsNullOrEmpty(str)) return null;
            Byte[] toEncryptArray = Encoding.UTF8.GetBytes(str);
            RijndaelManaged rm = new RijndaelManaged
            {
                Key = Encoding.UTF8.GetBytes(key),
                Mode = CipherMode.ECB,
                Padding = PaddingMode.PKCS7
            };
            ICryptoTransform cTransform = rm.CreateEncryptor();
            Byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, , toEncryptArray.Length);
            return Convert.ToBase64String(resultArray, , resultArray.Length);
        }

        /// <summary>
        ///  AES 解密
        /// </summary>
        /// <param name="str"></param>
        /// <param name="key"></param>
        /// <returns></returns>
        public static string AesDecrypt(string str, string key)
        {
            if (string.IsNullOrEmpty(str)) return null;
            Byte[] toEncryptArray = Convert.FromBase64String(str);
            RijndaelManaged rm = new RijndaelManaged
            {
                Key = Encoding.UTF8.GetBytes(key),
                Mode = CipherMode.ECB,
                Padding = PaddingMode.PKCS7
            };
            ICryptoTransform cTransform = rm.CreateDecryptor();
            Byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, , toEncryptArray.Length);
            return Encoding.UTF8.GetString(resultArray);
        }

JAVA

package com.jun.project.utils;

import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;

import org.apache.tomcat.util.codec.binary.Base64;

public class AES {

    // 加密
    public static String Encrypt(String sSrc, String sKey) throws Exception {
        if (sKey == null) {
            System.out.print("Key为空null");
            return null;
        }
        // 判断Key是否为16位
        if (sKey.length() != 16) {
            System.out.print("Key长度不是16位");
            return null;
        }
        byte[] raw = sKey.getBytes("utf-8");
        SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
        Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");//"算法/模式/补码方式"
        cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
        byte[] encrypted = cipher.doFinal(sSrc.getBytes("utf-8"));

        return new Base64().encodeToString(encrypted);//此处使用BASE64做转码功能，同时能起到2次加密的作用。
    }

    // 解密
    public static String Decrypt(String sSrc, String sKey) throws Exception {
        try {
            // 判断Key是否正确
            if (sKey == null) {
                System.out.print("Key为空null");
                return null;
            }
            // 判断Key是否为16位
            if (sKey.length() != 16) {
                System.out.print("Key长度不是16位");
                return null;
            }
            byte[] raw = sKey.getBytes("utf-8");
            SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
            cipher.init(Cipher.DECRYPT_MODE, skeySpec);
            byte[] encrypted1 = new Base64().decode(sSrc);//先用base64解密
            try {
                byte[] original = cipher.doFinal(encrypted1);
                String originalString = new String(original,"utf-8");
                return originalString;
            } catch (Exception e) {
                System.out.println(e.toString());
                return null;
            }
        } catch (Exception ex) {
            System.out.println(ex.toString());
            return null;
        }
    }

    public static void main(String[] args) throws Exception {
        /*
         * 此处使用AES-128-ECB加密模式，key需要为16位。
         */
        String cKey = "ae125efkk4454eef";
        // 需要加密的字串
        String cSrc = "数据2343esdofsdfsdfw@wr[1";
        System.out.println(cSrc);
        // 加密
        String enString = AES.Encrypt(cSrc, cKey);
        System.out.println("加密后的字串是：" + enString);

        // 解密
        String DeString = AES.Decrypt(enString, cKey);
        System.out.println("解密后的字串是：" + DeString);
    }
}

参照：http://www.oschina.net/code/snippet_242957_9931