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aes

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

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/// <summary>AES加密</summary>
/// <param name="text">明文</param>
/// <param name="key">密钥,长度为16的字符串</param>
/// <param name="iv">偏移量,长度为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">密钥,长度为16的字符串</param>
/// <param name="iv">偏移量,长度为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);
}

 

 

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

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/**
* @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：

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/**
* 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);
}

原文地址:  https://blog.csdn.net/mr_qu/article/details/8433370

 

from:https://www.cnblogs.com/suizhikuo/p/9565409.html

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