AES加解密（JAVA）

Edited on In

加解密JAVA 实现

引入依赖

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<dependencies>
    <dependency>
        <groupId>commons-codec</groupId>
        <artifactId>commons-codec</artifactId>
        <version>1.15</version>
    </dependency>
</dependencies>

代码

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import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import java.nio.charset.StandardCharsets;
import java.security.NoSuchAlgorithmException;
import java.security.Provider;
import java.security.SecureRandom;
import java.util.Base64;
import java.util.Optional;
import java.util.UUID;

public class SecretUtil {
    private static final Logger log = LoggerFactory.getLogger(SecretUtil.class);
    private static final String AES = "AES";

    private SecretUtil() {
    }

    /**
     * 生成 key
     * 返回到前端时：keyStr=Base64.getEncoder().encodeToString(key);
     * 解密时：keyStr.getBytes()
     *
     * @return 密钥（Base64）
     */
    public static String generateAesKey() {
        return generateAesKey(null);
    }

    /**
     * 生成 key
     * 返回到前端时：keyStr=Base64.getEncoder().encodeToString(key);
     * 解密时：keyStr.getBytes()
     *
     * @param word 辅助关键字
     * @return key
     */
    public static String generateAesKey(String word) {
        /*随机UUID*/
        try {
            // 创建AES的 Key生产者
            KeyGenerator gen = KeyGenerator.getInstance(AES);
            // 利用用户密码作为随机数初始化出
            gen.init(128, new SecureRandom((Optional.ofNullable(word).orElse("") + UUID.randomUUID()).getBytes()));
            //加密没关系，SecureRandom 是生成安全随机数序列，password.getBytes()是种子，只要种子相同，序列就一样，所以解密只要有password就行
            // 根据用户密码，生成一个密钥
            SecretKey secretKey = gen.generateKey();
            // 返回基本编码格式的密钥，如果此密钥不支持编码，则返
            return Base64.getEncoder().encodeToString(secretKey.getEncoded());
        } catch (NoSuchAlgorithmException e) {
            log.error("生成 AES key 失败：{}", e.getMessage(), e);
        }
        return null;
    }

    /**
     * AES 加密
     *
     * @param content 待加密内容
     * @param key     密钥
     * @return 加密后结果（Base64编码）
     */
    public static String aesEncrypt(String content, String key) {
        return encrypt(content, Base64.getDecoder().decode(key), AES, null);
    }


    /**
     * AES 解密
     *
     * @param content 内容（Base64编码）
     * @param key     私钥
     * @return 解密后数据
     */
    public static String aesDecrypt(String content, String key) {
        return decrypt(content, Base64.getDecoder().decode(key), AES, null);
    }

    public static String encrypt(String content, byte[] key, String algorithm, Provider provider) {
        try {
            Cipher cipher = provider == null
                    ? Cipher.getInstance(algorithm)
                    : Cipher.getInstance(algorithm, provider);
            cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(key, algorithm));
            byte[] encryptStr = cipher.doFinal(content.getBytes(StandardCharsets.UTF_8));
            return Base64.getEncoder().encodeToString(encryptStr);
        } catch (Exception e) {
            log.error("{} 数据加密失败：{}", algorithm, e.getMessage(), e);
            return null;
        }
    }

    public static String decrypt(String content, byte[] key, String algorithm, Provider provider) {
        try {
            byte[] encryptByte = Base64.getDecoder().decode(content);
            Cipher cipher = provider == null
                    ? Cipher.getInstance(algorithm)
                    : Cipher.getInstance(algorithm, provider);
            cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(key, algorithm));
            byte[] decryptBytes = cipher.doFinal(encryptByte);
            return new String(decryptBytes);
        } catch (Exception e) {
            log.error("{} 数据解密失败：{}", algorithm, e.getMessage(), e);
            return null;
        }
    }
}

本文地址： https://github.com/maxzhao-it/blog/post/e89f3b77/