hmacwithsha1

SignTools.java

package util;

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

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

public class SignTools {

	private static final String HMAC_SHA1_ALGORITHM = "HmacSHA1";

	private static final char[] DIGIT = { '0', '1', '2', '3', '4', '5', '6',
			'7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };


	/**
	 * 使用hmacsha1安全摘要算法生成摘要
	 * @param data 需要摘要的字符串
	 * @param key 摘要使用的密钥
	 * @return 如果计算失败则返回null
	 */
	public static String sign(String data, String key){

		
		String dgst = null;

		SecretKeySpec signingKey = new SecretKeySpec(key.getBytes(),HMAC_SHA1_ALGORITHM);

		Mac mac = null;
		try {
			mac = Mac.getInstance(HMAC_SHA1_ALGORITHM);
			mac.init(signingKey);
			byte[] dg = mac.doFinal(data.getBytes());
			StringBuffer sb = new StringBuffer();//StringBuilder
			for (int i = 0; i < dg.length; i++) {
				sb.append(hexString(dg[i]));
			}
			dgst = sb.toString();
		} catch (NoSuchAlgorithmException e) {
			//ignore
		} catch (InvalidKeyException e) {
			e.printStackTrace();
		}
		return dgst;

	}

	private static String hexString(byte b) {
		char[] ob = new char[2];
		ob[0] = DIGIT[(b >>> 4) & 0X0F];
		ob[1] = DIGIT[b & 0X0F];
		String s = String.valueOf(ob);
		return s;
	}

	public static void main(String[] args) throws Exception {
		String data = "562742098461008807900199";
		String key = "HZsn43%Y6Z5wyMqp@I&g&u0dl@Vd^oHS";// </dev/urandom tr -dc 'a-zA-Z0-9!@#$%^&*()'|fold   -w 32|head -n1
		System.out.println(SignTools.sign(data,key));
	}

}