【小工匠聊密码学】--消息摘要--HMAC算法

算法种类                摘要长度

HmacMD5                 128
HmacSHA1                160
HmacSHA256              256
HmacSHA384              384
HmacSHA512              512

package lzf.cipher.jdk;
import java.nio.charset.Charset;
import javax.crypto.KeyGenerator;
import javax.crypto.Mac;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
/**
 * @author java小工匠
 */
public class HmacUtils {
    // 获取 HmacMD5 Key
    public static byte[] getHmacMd5Key() {
        return getHmacKey("HmacMD5");
    }
    // 获取 HmacSHA256
    public static byte[] getHmacSha256Key() {
        return getHmacKey("HmacSHA256");
    }
    // 获取 HmacSHA512
    public static byte[] getHmacSha512Key() {
        return getHmacKey("HmacSHA512");
    }
    // 获取 HMAC Key
    public static byte[] getHmacKey(String type) {
        try {
            // 1、创建密钥生成器
            KeyGenerator keyGenerator = KeyGenerator.getInstance(type);
            // 2、产生密钥
            SecretKey secretKey = keyGenerator.generateKey();
            // 3、获取密钥
            byte[] key = secretKey.getEncoded();
            return key;
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
    // HMAC MD5 加密
    public static String encryptHmacMD5(byte[] data, byte[] key) {
        return encryptHmac(data, key, "HmacMD5");
    }
    // HMAC SHA256 加密
    public static String encryptHmacSHA256(byte[] data, byte[] key) {
        return encryptHmac(data, key, "HmacSHA256");
    }
    // HMAC SHA521 加密
    public static String encryptHmacSHA512(byte[] data, byte[] key) {
        return encryptHmac(data, key, "HmacSHA512");
    }
    // 基础MAC 算法
    public static String encryptHmac(byte[] data, byte[] key, String type) {
        try {
            // 1、还原密钥
            SecretKey secretKey = new SecretKeySpec(key, type);
            // 2、创建MAC对象
            Mac mac = Mac.getInstance(type);
            // 3、设置密钥
            mac.init(secretKey);
            // 4、数据加密
            byte[] bytes = mac.doFinal(data);
            // 5、生成数据
            String rs = bytesToHexStr(bytes, true);
            return rs;
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
    // 字节数组转16 进制
    public static String bytesToHexStr(byte[] bytes, boolean blow) {
        if (bytes == null) {
            return "";
        }
        StringBuilder sb = new StringBuilder();
        for (byte b : bytes) {
            int v = b & 0xFF;
            String hv = Integer.toHexString(v);
            if (hv.length() < 2) {
                sb.append("0");
            }
            sb.append(hv);
        }
        String rs = sb.toString();
        if (!blow) {
            rs = rs.toUpperCase();
        }
        return rs;
    }
    public static void main(String[] args) {
        byte[] data = "java小工匠".getBytes(Charset.forName("UTF-8"));
        // MD5
        byte[] hmacMd5KeyBytes = getHmacMd5Key();
        String hexHamcMd5Key = bytesToHexStr(hmacMd5KeyBytes, true);
        System.out.println("HMAC Md5 KEY:" + hexHamcMd5Key);
        String hmacMd5Encrypt = encryptHmacMD5(data, hmacMd5KeyBytes);
        System.out.println("HMAC Md5 encrypt:" + hmacMd5Encrypt);
        // SHA256
        byte[] hmacSha256KeyBytes = getHmacSha256Key();
        String hexHamcSha256Key = bytesToHexStr(hmacSha256KeyBytes, true);
        System.out.println("HMAC SHA256 KEY:" + hexHamcSha256Key);
        String hmacSha256Encrypt = encryptHmacSHA256(data, hmacSha256KeyBytes);
        System.out.println("HMAC SHA256 encrypt:" + hmacSha256Encrypt);
        // SHA512
        byte[] hmacSha512KeyBytes = getHmacSha256Key();
        String hexHamcSha512Key = bytesToHexStr(hmacSha512KeyBytes, true);
        System.out.println("HMAC SHA512 KEY:" + hexHamcSha512Key);
        String hmacSha512Encrypt = encryptHmacSHA512(data, hmacSha512KeyBytes);
        System.out.println("HMAC SHA512 encrypt:" + hmacSha512Encrypt);
    }
}