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import javax.crypto.Mac;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class EncodeSignature {
    /**
     * 定義加密方式
     * MAC算法可選以下多種算法
     * <pre>
     * HmacMD5
     * HmacSHA1
     * HmacSHA256
     * HmacSHA384
     * HmacSHA512
     * </pre>**/
    private static final String MAC_NAME = "HmacSHA256";
    private static final String ENCODING = "UTF-8";

    public static String bytesToHexString(byte[] srcArray)
    {
        if ((srcArray == null) || (srcArray.length == 0)) {
            return "";
        }
        StringBuffer sb = new StringBuffer(srcArray.length);
        for (int i = 0; i < srcArray.length; i++)
        {
            String temp = Integer.toHexString(0xFF & srcArray[i]);
            if (temp.length() < 2) {
                sb.append(0);
            }
            sb.append(temp);
        }
        return sb.toString();
    }

    public static String encodeSHA256(String str)
            throws NoSuchAlgorithmException, UnsupportedEncodingException
    {
        if ("".equals(str)) {
            return str;
        }
        MessageDigest md = MessageDigest.getInstance("SHA-256");
        md.update(str.getBytes("UTF-8"));
        byte[] hashByte = md.digest();
        return bytesToHexString(hashByte);
    }

    /**
     * 使用 HMAC-SHA256 簽名方法對(duì)對(duì)encryptText進(jìn)行簽名
     * @param encryptText 被簽名的字符串
     * @param encryptKey  密鑰
     * @return
     * @throws Exception
     */
    public static byte[] HmacSHA256Encrypt(String encryptText, String encryptKey) throws Exception
    {
        byte[] data=encryptKey.getBytes(ENCODING);
        //根據(jù)給定的字節(jié)數(shù)組構(gòu)造一個(gè)密鑰,第二參數(shù)指定一個(gè)密鑰算法的名稱
        SecretKey secretKey = new SecretKeySpec(data, MAC_NAME);
        //生成一個(gè)指定 Mac 算法 的 Mac 對(duì)象
        Mac mac = Mac.getInstance(MAC_NAME);
        //用給定密鑰初始化 Mac 對(duì)象
        mac.init(secretKey);

        byte[] text = encryptText.getBytes(ENCODING);
        //完成 Mac 操作
        return mac.doFinal(text);
    }

    public static void main(String[] args) throws Exception {
        //1、對(duì)RequestBody進(jìn)行SHA-256計(jì)算，并進(jìn)行Base16轉(zhuǎn)碼
        String RequestPayload = "{\"userAccount\":\"yuthird\",\"clientType\":5,\"userName\":\"yuthird\",\"userEmail\":\"yuthird@huawei.com\",\"userPhone\":\"13511112222\"}";
        System.out.println(encodeSHA256(RequestPayload));

        //2、拼接待請(qǐng)求數(shù)據(jù)，并將待請(qǐng)求數(shù)據(jù)進(jìn)行SHA-256計(jì)算，并進(jìn)行Base16轉(zhuǎn)碼
        String CanonicalRequest = "POST\n/rest/usg/sso/v1/auth/appauth/\ncontent-type:application/json\ndate:20190329T074551Z\n\n" + encodeSHA256(RequestPayload);
        String HashedCanonicalRequest = encodeSHA256(CanonicalRequest);
        System.out.println(HashedCanonicalRequest);

        //3、拼接待簽名字符串，并將待簽名字符串進(jìn)行HMAC-SHA256計(jì)算，并Base16轉(zhuǎn)碼
        String StringToSign = "HMAC-SHA256\n20190329T074551Z\n" + HashedCanonicalRequest;
        String signature = bytesToHexString(HmacSHA256Encrypt(StringToSign,"gHKag2yRtR2bP83x"));
        System.out.println("signature:" + signature);
    }
}