C#与Java互通AES算法加密解密

利用AES加密算法对报文进行加密解密，实现C#与Java互通，网上查了一堆也许是因为版本的原因都用不了，于是还是静心下来自己写个：

直接上代码：

C# 需要引用System.Security.Cryptography命名空间

        /// 
AES加密
        /// 明文
        /// 密钥,长度为16的字符串
        /// 偏移量,长度为16的字符串
        /// 密文
        public static string EncodeAES(string text, string key,string iv)
        {
            RijndaelManaged rijndaelCipher = new RijndaelManaged();
            rijndaelCipher.Mode = CipherMode.CBC;
            rijndaelCipher.Padding = PaddingMode.Zeros;
            rijndaelCipher.KeySize = 128;
            rijndaelCipher.BlockSize = 128;
            byte[] pwdBytes = System.Text.Encoding.UTF8.GetBytes(key);
            byte[] keyBytes = new byte[16];
            int len = pwdBytes.Length;
            if (len > keyBytes.Length)
                len = keyBytes.Length;
            System.Array.Copy(pwdBytes, keyBytes, len);
            rijndaelCipher.Key = keyBytes;
            rijndaelCipher.IV = Encoding.UTF8.GetBytes(iv);
            ICryptoTransform transform = rijndaelCipher.CreateEncryptor();
            byte[] plainText = Encoding.UTF8.GetBytes(text);
            byte[] cipherBytes = transform.TransformFinalBlock(plainText, 0, plainText.Length);
            return Convert.ToBase64String(cipherBytes);
        }

        /// 
AES解密
        /// 密文
        /// 密钥,长度为16的字符串
        /// 偏移量,长度为16的字符串
        /// 明文
        public static string DecodeAES(string text, string key,string iv)
        {
            RijndaelManaged rijndaelCipher = new RijndaelManaged();
            rijndaelCipher.Mode = CipherMode.CBC;
            rijndaelCipher.Padding = PaddingMode.Zeros;
            rijndaelCipher.KeySize = 128;
            rijndaelCipher.BlockSize = 128;
            byte[] encryptedData = Convert.FromBase64String(text);
            byte[] pwdBytes = System.Text.Encoding.UTF8.GetBytes(key);
            byte[] keyBytes = new byte[16];
            int len = pwdBytes.Length;
            if (len > keyBytes.Length)
                len = keyBytes.Length;
            System.Array.Copy(pwdBytes, keyBytes, len);
            rijndaelCipher.Key = keyBytes;
            rijndaelCipher.IV = Encoding.UTF8.GetBytes(iv);
            ICryptoTransform transform = rijndaelCipher.CreateDecryptor();
            byte[] plainText = transform.TransformFinalBlock(encryptedData, 0, encryptedData.Length);
            return Encoding.UTF8.GetString(plainText);
        }

Java，需要以下引用：

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

另外需要对String和byte[]相互转换的类，我自己写的Base64Helper

	/**
	 * @author miracle.qu
	 * @see AES算法加密明文
	 * @param data 明文
	 * @param key 密钥，长度16
	 * @param iv 偏移量，长度16
	 * @return 密文
	 */
	  public static String encryptAES(String data,String key,String iv) throws Exception {
	        try {
	            Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
	            int blockSize = cipher.getBlockSize();
	            byte[] dataBytes = data.getBytes();
	            int plaintextLength = dataBytes.length;
	            
	            if (plaintextLength % blockSize != 0) {
	                plaintextLength = plaintextLength + (blockSize - (plaintextLength % blockSize));
	            }
	
	            byte[] plaintext = new byte[plaintextLength];
	            System.arraycopy(dataBytes, 0, plaintext, 0, dataBytes.length);
	             
	            SecretKeySpec keyspec = new SecretKeySpec(key.getBytes(), "AES");
	            IvParameterSpec ivspec = new IvParameterSpec(iv.getBytes());
	
	            cipher.init(Cipher.ENCRYPT_MODE, keyspec, ivspec);
	            byte[] encrypted = cipher.doFinal(plaintext);
	
	            return Base64Helper.encode(encrypted).trim();
	
	        } catch (Exception e) {
	            e.printStackTrace();
	            return null;
	        }
	    }
	
		/**
		 * @author miracle.qu
		 * @see AES算法解密密文
		 * @param data 密文
		 * @param key 密钥，长度16
		 * @param iv 偏移量，长度16
		 * @return 明文
		 */
	    public static String decryptAES(String data,String key,String iv) throws Exception {
	        try
	        {
	            byte[] encrypted1 = Base64Helper.decode(data);
	             
	            Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
	            SecretKeySpec keyspec = new SecretKeySpec(key.getBytes(), "AES");
	            IvParameterSpec ivspec = new IvParameterSpec(iv.getBytes());
	             
	            cipher.init(Cipher.DECRYPT_MODE, keyspec, ivspec);
	
	            byte[] original = cipher.doFinal(encrypted1);
	            String originalString = new String(original);
	            return originalString.trim();
	        }
	        catch (Exception e) {
	            e.printStackTrace();
	            return null;
	        }
	    }

其中Base64Helper类是个简单的类，引用：

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

其中核心代码：

	/**
	 * 编码
	 * @param byteArray
	 * @return
	 */
    public static String encode(byte[] byteArray) {
        return new String(new Base64().encode(byteArray));
    }

    /**
     * 解码
     * @param base64EncodedString
     * @return
     */
    public static byte[] decode(String base64EncodedString) {
    	return new Base64().decode(base64EncodedString);
    }