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
[csharp] view plaincopyprint?-
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- 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);
- }
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- 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
[java] view plaincopyprint?-
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- 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;
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- if (plaintextLength % blockSize != 0) {
- plaintextLength = plaintextLength + (blockSize - (plaintextLength % blockSize));
- }
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- byte[] plaintext = new byte[plaintextLength];
- System.arraycopy(dataBytes, 0, plaintext, 0, dataBytes.length);
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- SecretKeySpec keyspec = new SecretKeySpec(key.getBytes(), "AES");
- IvParameterSpec ivspec = new IvParameterSpec(iv.getBytes());
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- cipher.init(Cipher.ENCRYPT_MODE, keyspec, ivspec);
- byte[] encrypted = cipher.doFinal(plaintext);
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- return Base64Helper.encode(encrypted).trim();
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- } catch (Exception e) {
- e.printStackTrace();
- return null;
- }
- }
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- public static String decryptAES(String data,String key,String iv) throws Exception {
- try
- {
- byte[] encrypted1 = Base64Helper.decode(data);
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- Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
- SecretKeySpec keyspec = new SecretKeySpec(key.getBytes(), "AES");
- IvParameterSpec ivspec = new IvParameterSpec(iv.getBytes());
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- cipher.init(Cipher.DECRYPT_MODE, keyspec, ivspec);
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- 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:
[java] view plaincopyprint?-
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- public static String encode(byte[] byteArray) {
- return new String(new Base64().encode(byteArray));
- }
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- public static byte[] decode(String base64EncodedString) {
- return new Base64().decode(base64EncodedString);
- }