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测试数据mons.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

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