工具类十六 -RSA算法加解密工具类

生成的key是经过base64编码的字符串便于存储,Base64使用的编码协议为RFC4648

生成密钥

package com.taylor.test.manage.util;

import lombok.extern.slf4j.Slf4j;

import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.util.Base64;

/**
 *
 * Generates a key pair.
 *
 * Use keys to encrypt and decrypt data
 *
 *
 * @author liyue
 * @version v1
 * @create 2019-11-29 15:57:32
 * @copyright www.owinfo.net
 */
@Slf4j
public class SecretKey {
   

    private static final String KEY_ALGORITHM = "RSA";

    private static final int DEFAULT_KEY_SIZE = 1024;

    private static final Base64.Encoder BASE64_ENCODER = Base64.getEncoder();

    /**
     * Generates a key pair.
     * Using RAS algorithm, the default size is 1024
     * This will generate a new key pair every time it is called.
     *
     * The generated KeyPair will be encoded using Base64 {@link Base64.Encoder}
     *
     * @return the generated key pair {@link KeyPair}
     */
    public static KeyPair generate() throws GenerateKeyPairException {
   
        KeyPairGenerator keyPairGen;
        try {
   
            keyPairGen = KeyPairGenerator.getInstance(KEY_ALGORITHM);
        } catch (NoSuchAlgorithmException e) {
   
            if (log.isDebugEnabled()) {
   
                e.printStackTrace();
            }
            throw new GenerateKeyPairException("Failed to generate keyPair, " +
                    "because RSA algorithm is not supported, " + e.toString());
        }
        keyPairGen.initialize(DEFAULT_KEY_SIZE);
        java.security.KeyPair keyPair = keyPairGen.generateKeyPair();
        PublicKey publicKey = keyPair.getPublic();
        PrivateKey privateKey = keyPair.getPrivate();

        KeyPair pair = new KeyPair();
        pair.setPublicKey(BASE64_ENCODER.encodeToString(publicKey.getEncoded()));
        pair.setPrivateKey(BASE64_ENCODER.encodeToString(privateKey.getEncoded()));
        return pair;
    }
}

加密

package com.taylor.test.restful.util;

import lombok.extern.slf4j.Slf4j;

import javax.crypto.Cipher;
import java.io.ByteArrayOutputStream;
import java.security.Key;
import java.security.KeyFactory;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security