java HMAC_SHA1加密

import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;

import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;

public class HMACSHA1 {

private static final String HMAC_SHA1 = "HmacSHA1";

/**
* 生成签名数据
*
* @param data 待加密的数据
* @param key 加密使用的key
* @return 生成MD5编码的字符串
* @throws InvalidKeyException
* @throws NoSuchAlgorithmException
*/
public static String getSignature(byte[] data, byte[] key) throws InvalidKeyException, NoSuchAlgorithmException {
SecretKeySpec signingKey = new SecretKeySpec(key, HMAC_SHA1);
Mac mac = Mac.getInstance(HMAC_SHA1);
mac.init(signingKey);
byte[] rawHmac = mac.doFinal(data);
return MD5.encode(rawHmac);
}

}

/**
* MD5算法
*/
public class MD5 {

/**
* 获取MD5 结果字符串
*
* @param source
* @return
*/
public static String encode(byte[] source) {
String s = null;
char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
try {
java.security.MessageDigest md = java.security.MessageDigest.getInstance("MD5");
md.update(source);
byte tmp[] = md.digest();
char str[] = new char[16 * 2];
int k = 0;
for (int i = 0; i < 16; i++) {
byte byte0 = tmp[i];
str[k++] = hexDigits[byte0 >>> 4 & 0xf];
str[k++] = hexDigits[byte0 & 0xf];
}
s = new String(str);
} catch (Exception e) {
e.printStackTrace();
}
return s;
}

public static String getMD5(String source) {
return (source == null || "".equals(source)) ? "" : getMD5(source);
}
}