JAVA中HMAC之SHA256位签名算法

HMAC之SHA256简介

HMAC之SHA256的功能:
    对字节流进行加密返回一个字节流

import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
 
public class HMAC {
    public static void main(String[] args) throws Exception {
        String s=HMACSHA256("java265.com","893223*(1124f3434");
        System.out.println(s);
    }
 

public static String HMACSHA256(String data, String key) throws Exception {
	Mac mac = Mac.getInstance("HmacSHA256");
	mac.init(new SecretKeySpec(key.getBytes("UTF-8"), "HmacSHA256"));
	byte[] signData = mac.doFinal(data.getBytes("UTF-8"));
	StringBuilder sb = new StringBuilder();
	for (byte item : signData) {
		sb.append(Integer.toHexString((item & 0xFF) | 0x100).substring(1, 3));
	}
	return sb.toString().toUpperCase();
 }

}