记AES加密在linux系统每次都不一样的问题

蔚落 2023-07-15 13:04 23阅读 0赞

在项目中通常会用到AES的加密方法，具体代码如下

package com.mt.demo.client.utils;
    
    import lombok.extern.slf4j.Slf4j;
    import org.bouncycastle.jce.provider.BouncyCastleProvider;
    import org.springframework.stereotype.Component;
    
    import javax.crypto.*;
    import javax.crypto.spec.SecretKeySpec;
    import java.io.UnsupportedEncodingException;
    import java.nio.charset.StandardCharsets;
    import java.security.*;
    import java.util.Base64;
    
    /**
     * AESUtils
     *
     * @author mt.luo
     * @description: AES加密
     */
    @Slf4j
    @Component
    public class AESUtils {
        private final String aesSeed = "ada46ab5da824b96a18409c49dc91dc2";
        private final String algorithm = "SHA-256";
        private final String AES = "AES";
        private final String cipher = "AES/ECB/PKCS7Padding";
        private final String provider = "BC";
    
        /**
         * convert to byte[]
         *
         * @param key key
         * @return byte[]
         * @throws NoSuchAlgorithmException
         */
        private byte[] toHash256(String key) throws NoSuchAlgorithmException {
            MessageDigest messageDigest = MessageDigest.getInstance(this.algorithm);
            messageDigest.update(key.getBytes());
            return messageDigest.digest();
        }
    
        /**
         * parseHexStrToByte
         *
         * @param hexStr hexStr
         * @return byte
         */
        private byte[] parseHexStrToByte(String hexStr) {
            if (hexStr.length() < 1) {
                return null;
            }
            byte[] result = new byte[hexStr.length() / 2];
            for (int i = 0; i < hexStr.length() / 2; i++) {
                int high = Integer.parseInt(hexStr.substring(i * 2, i * 2 + 1), 16);
                int low = Integer.parseInt(hexStr.substring(i * 2 + 1, i * 2 + 2), 16);
                result[i] = (byte) (high * 16 + low);
            }
            return result;
        }
    
        /**
         * parseByteToHexStr
         *
         * @param bytes bytes
         * @return String
         */
        private String parseByteToHexStr(byte[] bytes) {
            StringBuilder stringBuilder = new StringBuilder();
            for (byte b : bytes) {
                String hex = Integer.toHexString(b & 0xFF);
                if (hex.length() == 1) {
                    hex = '0' + hex;
                }
                stringBuilder.append(hex.toUpperCase());
            }
            return stringBuilder.toString();
        }
    
        /**
         * 获取密钥
         *
         * @param seed seed
         * @return SecretKeySpec
         * @throws NoSuchAlgorithmException NoSuchAlgorithmException
         */
        private SecretKeySpec getSecretKeySpec(String seed) throws NoSuchAlgorithmException {
            KeyGenerator keyGenerator = KeyGenerator.getInstance(this.AES);
            SecureRandom secureRandom = new SecureRandom(this.toHash256(seed));
            keyGenerator.init(256, secureRandom);
            SecretKey secretKey = keyGenerator.generateKey();
            byte[] encode = secretKey.getEncoded();
            SecretKeySpec secretKeySpec = new SecretKeySpec(encode, this.AES);
            Security.addProvider(new BouncyCastleProvider());
            return secretKeySpec;
        }
    
        /**
         * 加密
         *
         * @param data data
         * @return String
         * @throws NoSuchAlgorithmException
         * @throws NoSuchProviderException
         * @throws NoSuchPaddingException
         * @throws UnsupportedEncodingException
         * @throws BadPaddingException
         * @throws IllegalBlockSizeException
         */
        public String encrypt(String data) throws NoSuchAlgorithmException, NoSuchProviderException, NoSuchPaddingException,
                UnsupportedEncodingException, BadPaddingException, IllegalBlockSizeException, InvalidKeyException {
            SecretKeySpec secretKeySpec = this.getSecretKeySpec(this.aesSeed);
            Cipher cipher = Cipher.getInstance(this.cipher, this.provider);
            cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec);
            return this.parseByteToHexStr(Base64.getEncoder().encode(cipher.doFinal(data.getBytes(StandardCharsets.UTF_8.name()))));
        }
    }

然后这样使用在windows系统的时候没有问题，而将程序部署到Linux则发现每次加密之后获取的加密字符串都不同，也无法解密，重写获取密钥部分的代码

/**
         * 获取密钥
         *
         * @param seed seed
         * @return SecretKeySpec
         * @throws NoSuchAlgorithmException NoSuchAlgorithmException
         */
        private SecretKeySpec getSecretKeySpec(String seed) throws NoSuchAlgorithmException {
            KeyGenerator keyGenerator = KeyGenerator.getInstance(this.AES);
            SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
            secureRandom.setSeed(this.toHash256(seed));
            keyGenerator.init(256, secureRandom);
            SecretKey secretKey = keyGenerator.generateKey();
            byte[] encode = secretKey.getEncoded();
            SecretKeySpec secretKeySpec = new SecretKeySpec(encode, this.AES);
            Security.addProvider(new BouncyCastleProvider());
            return secretKeySpec;
        }

#### 主要原因是SecureRandom 实现完全隨操作系统本身的内部状态，除非调用方在调用 getInstance 方法之后又调用了 setSeed 方法；该实现在 windows 上每次生成的 key 都相同，但是在 linux 系统上则不同。 ####

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![在这里插入图片描述][70]

[70]: /images/20230528/c63173053c414105b0b06e40512a94d5.png