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package io.afu.utils.encryption;

import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import java.nio.charset.StandardCharsets;
import java.security.InvalidKeyException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

/**
 * sha 加密
 */
public class SHAEncryption {

    public static final String HMAC_ALGORITHM_DEFAULT = "HmacSHA1";

    public static final String HMAC_ALGORITHM_SHA256 = "HmacSHA256";

    public static String sha256(String str){
        MessageDigest messageDigest;
        String encodeStr = "";
        try {
            messageDigest = MessageDigest.getInstance("SHA-256");
            messageDigest.update(str.getBytes());
            encodeStr = EncryptCommon.byteArrayToHex(messageDigest.digest());
        }catch (Exception e){
            e.printStackTrace();
        }
        return encodeStr;
    }

    public static String getHmacSha1(String data,String key){
        return HmacSHA1(data,key);
    }

    public static String HmacSHA1(String data,String key){
        return HmacSha(data,key,HMAC_ALGORITHM_DEFAULT);
    }

    public static String HmacSHA256(String data,String key) {
        return HmacSha(data,key,HMAC_ALGORITHM_SHA256);
    }

    public static String HmacSha(String data,String key,String enType) {
        byte[] dataByte= data.getBytes(StandardCharsets.UTF_8);
        byte[] keyByte = key.getBytes(StandardCharsets.UTF_8);
        try {
            SecretKeySpec signingKey = new SecretKeySpec(keyByte, enType);
            Mac mac = Mac.getInstance(enType);
            mac.init(signingKey);
            return EncryptCommon.byteArrayToHex(mac.doFinal(dataByte));
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (InvalidKeyException e) {
            e.printStackTrace();
        }
        return null;
    }



    /**
     * 验证hmacSha1的加密是否正确
     * @param targetStr 目标加密串
     * @param orginStr 原始加密串
     * @param key 加密key
     * @return Boolean 比对结果
     */
    public static Boolean verifyHmacSha1(String targetStr,String orginStr,String key){
        String encryptedStr = getHmacSha1(orginStr,key);
        if (encryptedStr.equals(targetStr)){
            return true;
        }
        return false;
    }



    public static void main(String[] args){
        System.out.println("args = [" + sha256("qunimad") + "]");
        System.out.println("str = [qunimad], key = [233], encrypt = [" + getHmacSha1("qunimad","233") + "]");



    }

}