第十一周课后练习

import org.apache.commons.lang3.StringUtils;
/** * @author ccc * @date 2021/01/02 */public class CheckPwd {    /**     * @param userId     用户编码     * @param password   明文密码     * @param cipherText 加密密码     * @return 是否正确 默认不正确     */    static boolean checkPwd(String userId, String password, String cipherText) {        // 加密后的字符串        String encrypt = SecurityUtils.encrypt(password, userId);        assert encrypt != null;        // 解密后的原文 64E2DD2D68BDFBF42E3E818FC966B993        return StringUtils.equals(encrypt, cipherText);    }
    public static void main(String[] args) {        // 使用用户名作为盐用户名：ccc 密码:123456 加密后密文：64E2DD2D68BDFBF42E3E818FC966B993        System.out.println("1、输入用户名：ccc，密码：111111（正确密码是123456)");        boolean b = checkPwd("ccc", "111111", "64E2DD2D68BDFBF42E3E818FC966B993");        System.out.println(String.format("密码是否正确：%s", !b ? "否" : "是"));
        System.out.println("1、输入用户名：ccc，密码：123456（正确密码是123456)");        boolean b1 = checkPwd("ccc", "123456", "64E2DD2D68BDFBF42E3E818FC966B993");        System.out.println(String.format("密码是否正确：%s", !b1 ? "否" : "是"));    }}

import lombok.extern.slf4j.Slf4j;
import javax.crypto.Cipher;import javax.crypto.KeyGenerator;import javax.crypto.SecretKey;import javax.crypto.spec.SecretKeySpec;import java.security.SecureRandom;
@Slf4jpublic class SecurityUtils {    /**     * 编码格式     */    private static final String ENCODING = "UTF-8";    /**     * 加密算法     */    public static final String KEY_ALGORITHM = "AES";    /**     * 签名算法     */    public static final String SIGN_ALGORITHMS = "SHA1PRNG";
    /**     * 加密     *     * @param content 待加密内容     * @param key     加密的密钥     * @return     */    public static String encrypt(String content, String key) {        try {            KeyGenerator kgen = KeyGenerator.getInstance(KEY_ALGORITHM);            SecureRandom random = SecureRandom.getInstance(SIGN_ALGORITHMS);            random.setSeed(key.getBytes(ENCODING));            kgen.init(128, random);            SecretKey secretKey = kgen.generateKey();            byte[] enCodeFormat = secretKey.getEncoded();            SecretKeySpec secretKeySpec = new SecretKeySpec(enCodeFormat, KEY_ALGORITHM);            Cipher cipher = Cipher.getInstance(KEY_ALGORITHM);            byte[] byteContent = content.getBytes(ENCODING);            cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec);            byte[] byteRresult = cipher.doFinal(byteContent);            StringBuffer sb = new StringBuffer();            for (int i = 0; i < byteRresult.length; i++) {                String hex = Integer.toHexString(byteRresult[i] & 0xFF);                if (hex.length() == 1) {                    hex = '0' + hex;                }                sb.append(hex.toUpperCase());            }            return sb.toString();        } catch (Exception e) {            log.error("加密操作", e);        }        return null;    }
    /**     * 解密     *     * @param content 待解密内容     * @param key     解密的密钥     * @return     */    public static String decrypt(String content, String key) {        if (content.length() < 1) {            return null;        }
        byte[] byteRresult = new byte[content.length() / 2];        for (int i = 0; i < content.length() / 2; i++) {            int high = Integer.parseInt(content.substring(i * 2, i * 2 + 1), 16);            int low = Integer.parseInt(content.substring(i * 2 + 1, i * 2 + 2), 16);            byteRresult[i] = (byte) (high * 16 + low);        }        try {            KeyGenerator kgen = KeyGenerator.getInstance(KEY_ALGORITHM);            SecureRandom random = SecureRandom.getInstance(SIGN_ALGORITHMS);            random.setSeed(key.getBytes(ENCODING));            kgen.init(128, random);            SecretKey secretKey = kgen.generateKey();            byte[] enCodeFormat = secretKey.getEncoded();            SecretKeySpec secretKeySpec = new SecretKeySpec(enCodeFormat, KEY_ALGORITHM);            Cipher cipher = Cipher.getInstance(KEY_ALGORITHM);            cipher.init(Cipher.DECRYPT_MODE, secretKeySpec);            byte[] result = cipher.doFinal(byteRresult);            return new String(result, ENCODING);        } catch (Exception e) {            log.error("解密操作", e);        }        return null;    }
}