.NET與Java互通AES算法加密解密

/// <summary>AES加密</summary>  
/// <param name="text">明文</param>  
/// <param name="key">密鑰,長度為16的字符串</param>  
/// <param name="iv">偏移量,長度為16的字符串</param>  
/// <returns>密文</returns>  
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); } /// <summary>AES解密</summary> /// <param name="text">密文</param> /// <param name="key">密鑰,長度為16的字符串</param> /// <param name="iv">偏移量,長度為16的字符串</param> /// <returns>明文</returns> 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); } 

上面代碼為C# 需要引用System.Security.Cryptography命名空間

 

Java，需要以下引用：

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

另外需要對String和byte[]相互轉換的類，我自己寫的Base64Helper

/** 
 * @author miracle.qu 
 * @see AES算法加密明文 
 * @param data 明文 
 * @param key 密鑰，長度16 
 * @param iv 偏移量，長度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 密鑰，長度16 
     * @param iv 偏移量，長度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類是個簡單的類，引用：

 

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

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

摘抄 ：http://blog.csdn.net/mr_qu/article/details/8433370

https://en.wikipedia.org/wiki/Initialization_vector