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

/// <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

/**
* @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);
}