????HMAC
????HMAC(Hash Message Authentication Code???????????????????????Hash???????Э?顣???????????????????????ù????????????????????????????????????????????????????????????????????????????????????С??С????飬??MAC???????????????У???????????????????????????????м?????????

????BASE64???????????????????????
????MD5??SHA???HMAC??????????κ??????????????????????????????????У???????????????????????????HMAC????????????????????????????е?????????????????????????
???????????????????????У???????????????????????
???????????￡?

 

import java.math.BigInteger;
import java.security.InvalidKeyException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import javax.crypto.KeyGenerator;
import javax.crypto.Mac;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import org.apache.commons.codec.binary.Base64;
public class MyEncrypt {
public static final String KEY_SHA = "SHA";
public static final String KEY_MD5 = "MD5";
public static final String KEY_MAC = "HmacMD5";
// sun?????????????????base64????apache?????
/**
* BASE64????
*/
public static byte[] decryptBASE64(byte[] dest) {
if (dest == null) {
return null;
}
return Base64.decodeBase64(dest);
}
/**
* BASE64????
*/
public static byte[] encryptBASE64(byte[] origin) {
if (origin == null) {
return null;
}
return Base64.encodeBase64(origin);
}
/**
* MD5????
*
* @throws NoSuchAlgorithmException
*/
public static byte[] encryptMD5(byte[] data)
throws NoSuchAlgorithmException {
if (data == null) {
return null;
}
MessageDigest md5 = MessageDigest.getInstance(KEY_MD5);
md5.update(data);
return md5.digest();
}
/**
* SHA????
*
* @throws NoSuchAlgorithmException
*/
public static byte[] encryptSHA(byte[] data)
throws NoSuchAlgorithmException {
if (data == null) {
return null;
}
MessageDigest sha = MessageDigest.getInstance(KEY_SHA);
sha.update(data);
return sha.digest();
}
/**
* ?????HMAC???
*
* @throws NoSuchAlgorithmException
*/
public static String initMacKey() throws NoSuchAlgorithmException {
KeyGenerator keyGenerator = KeyGenerator.getInstance(KEY_MAC);
SecretKey secretKey = keyGenerator.generateKey();
return new String(encryptBASE64(secretKey.getEncoded()));
}
/**
* HMAC????
*
* @throws NoSuchAlgorithmException
* @throws InvalidKeyException
*/
public static byte[] encryptHMAC(byte[] data?? String key)
throws NoSuchAlgorithmException?? InvalidKeyException {
SecretKey secretKey = new SecretKeySpec(decryptBASE64(key.getBytes())??
KEY_MAC);
Mac mac = Mac.getInstance(secretKey.getAlgorithm());
mac.init(secretKey);
return mac.doFinal(data);
}
public static void main(String[] args) throws Exception {
// TODO Auto-generated method stub
String data = "??????";
System.out.println(new BigInteger(encryptBASE64(data.getBytes())).toString(16));
System.out.println(new BigInteger(encryptBASE64(data.getBytes())).toString(32));
System.out.println(new String(decryptBASE64(encryptBASE64(data.getBytes()))));
System.out.println(new BigInteger(encryptMD5(data.getBytes())).toString());
System.out.println(new BigInteger(encryptSHA(data.getBytes())).toString());
System.out.println(new BigInteger(encryptHMAC(data.getBytes()?? initMacKey())).toString());
}
}