package xin.merlin.myblog_server.utils;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

@Component
public class SHA256Util {
    /**
     * 对输入字符串进行SHA-256加密
     * @param input 输入字符串
     * @return 加密后的十六进制字符串
     */
    public String encryptSHA256(String input) {
        try {
            MessageDigest digest = MessageDigest.getInstance("SHA-256");
            byte[] encodedhash = digest.digest(input.getBytes());
            return bytesToHex(encodedhash);
        } catch (NoSuchAlgorithmException e) {
            throw new RuntimeException("SHA-256 algorithm not found", e);
        }
    }

    /**
     * 将字节数组转换为十六进制字符串
     * @param hash 字节数组
     * @return 十六进制字符串
     */
    private String bytesToHex(byte[] hash) {
        StringBuilder hexString = new StringBuilder(2 * hash.length);
        for (int i = 0; i < hash.length; i++) {
            String hex = Integer.toHexString(0xff & hash[i]);
            if (hex.length() == 1) {
                hexString.append('0');
            }
            hexString.append(hex);
        }
        return hexString.toString();
    }

    /**
     * 使用用户ID生成盐值，并对密码进行加密
     * @param password 用户输入的密码
     * @return 加密后的密码哈希值
     */

    public String encryptPassword(String password) {
        // 将盐值与密码拼接后进行SHA-256加密
        return encryptSHA256( password);
    }
}