【烦人的加密算法】国密SM2的使用--Java版本

深藏阁楼爱情的钟 2022-09-09 13:52 256阅读 0赞

开箱即用  
首先引入包

<dependency>
    	<groupId>org.bouncycastle</groupId>
    	<artifactId>bcprov-jdk15on</artifactId>
    	<version>1.6.8</version>
    </dependency>

import lombok.extern.slf4j.Slf4j;
    import org.apache.commons.lang3.StringUtils;
    import org.bouncycastle.asn1.gm.GMNamedCurves;
    import org.bouncycastle.asn1.x9.X9ECParameters;
    import org.bouncycastle.jcajce.provider.asymmetric.ec.BCECPrivateKey;
    import org.bouncycastle.jcajce.provider.asymmetric.ec.BCECPublicKey;
    import org.bouncycastle.jce.provider.BouncyCastleProvider;
    import org.bouncycastle.jce.spec.ECParameterSpec;
    import org.bouncycastle.jce.spec.ECPrivateKeySpec;
    import org.bouncycastle.jce.spec.ECPublicKeySpec;
    import org.bouncycastle.math.ec.ECPoint;
    import org.bouncycastle.util.encoders.Hex;
    
    import javax.crypto.Cipher;
    import java.math.BigInteger;
    import java.security.InvalidAlgorithmParameterException;
    import java.security.KeyFactory;
    import java.security.KeyPair;
    import java.security.KeyPairGenerator;
    import java.security.NoSuchAlgorithmException;
    import java.security.SecureRandom;
    import java.security.spec.ECGenParameterSpec;
    import java.util.Base64;
    import java.util.HashMap;
    import java.util.Map;
    
    /** * SM2加密 * * @author hcf * @date 2021/9/1 14:31 */
    @Slf4j
    public class SM2Utils { 
    
        /** * SM2 生成公私钥 * * @return 公私钥 */
        public static Map<String, String> generateKeyPair() { 
            Map<String, String> resultMap = new HashMap<>(2);
            try { 
                BouncyCastleProvider provider = new BouncyCastleProvider();
    
                // 获取椭圆曲线相关生成参数规格
                ECGenParameterSpec genParameterSpec = new ECGenParameterSpec("sm2p256v1");
                KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("EC", provider);
    
                // 使用SM2的算法区域初始化密钥生成器
                keyPairGenerator.initialize(genParameterSpec, new SecureRandom());
    
                // 生成密钥对
                KeyPair keyPair = keyPairGenerator.generateKeyPair();
                BCECPrivateKey exPrivateKey = (BCECPrivateKey) keyPair.getPrivate();
                BCECPublicKey ecPublicKey = (BCECPublicKey) keyPair.getPublic();
    
                // 解密密钥
                BigInteger privateKey = exPrivateKey.getD();
                // 加密密钥
                ECPoint publicKey = ecPublicKey.getQ();
    
                resultMap.put("privateKey", privateKey.toString(16));
                resultMap.put("publicKey", new String(Hex.encode(publicKey.getEncoded(true))));
            } catch (NoSuchAlgorithmException | InvalidAlgorithmParameterException e) { 
                log.info("NoSuchAlgorithmException | InvalidAlgorithmParameterException {}", e.getMessage(), e);
            }
            return resultMap;
        }
    
        /** * sm2 加密 * * @param publicKey 公钥 * @param content 内容 * @return 密文 */
        public static String encrypt(String publicKey, String content) { 
            String contentEncrypt = StringUtils.EMPTY;
            try { 
                BouncyCastleProvider provider = new BouncyCastleProvider();
                // 获取SM2相关参数
                X9ECParameters parameters = GMNamedCurves.getByName("sm2p256v1");
                // 椭圆曲线参数规格
                ECParameterSpec ecParameterSpec = new ECParameterSpec(parameters.getCurve(), parameters.getG(), parameters.getN(), parameters.getH());
                // 将公钥HEX字符串转换为椭圆曲线对应的点
                ECPoint ecPoint = parameters.getCurve().decodePoint(Hex.decode(publicKey));
                // 获取椭圆曲线KEY生成器
                KeyFactory keyFactory = KeyFactory.getInstance("EC", provider);
                // 将椭圆曲线点转为公钥KEY对象
                BCECPublicKey bcecPublicKey = (BCECPublicKey) keyFactory.generatePublic(new ECPublicKeySpec(ecPoint, ecParameterSpec));
    
                // 获取SM2加密器
                Cipher cipher = Cipher.getInstance("SM2", provider);
                // 初始化为加密模式
                cipher.init(Cipher.ENCRYPT_MODE, bcecPublicKey);
                // 加密并编码为base64格式
                contentEncrypt = Base64.getEncoder().encodeToString(cipher.doFinal(content.getBytes()));
    
            } catch (Exception e) { 
                log.info("SM2Utils.encrypt(java.lang.String, java.lang.String) error {}", e.getMessage(), e);
            }
            return contentEncrypt;
        }
    
        /** * sm2 加密 * * @param publicKey 公钥 * @param content 内容 * @return 密文 */
        public static String encrypt(String publicKey, byte[] content) { 
            return encrypt(publicKey, new String(content));
        }
    
        /** * sm2 加密 * * @param privateKey 私钥 * @param contentDecrypt 密文 * @return 明文 */
        public static String decrypt(String privateKey, String contentDecrypt) { 
            String content = StringUtils.EMPTY;
            try { 
                BouncyCastleProvider provider = new BouncyCastleProvider();
                // 获取SM2相关参数
                X9ECParameters parameters = GMNamedCurves.getByName("sm2p256v1");
                // 椭圆曲线参数规格
                ECParameterSpec ecParameterSpec = new ECParameterSpec(parameters.getCurve(), parameters.getG(), parameters.getN(), parameters.getH());
                // 将私钥HEX字符串转换为X值
                BigInteger bigInteger = new BigInteger(privateKey, 16);
                // 获取椭圆曲线KEY生成器
                KeyFactory keyFactory = KeyFactory.getInstance("EC", provider);
                // 将X值转为私钥KEY对象
                BCECPrivateKey bcecPrivateKey = (BCECPrivateKey) keyFactory.generatePrivate(new ECPrivateKeySpec(bigInteger, ecParameterSpec));
    
                // 获取SM2加密器
                Cipher cipher = Cipher.getInstance("SM2", provider);
                // 初始化为加密模式
                cipher.init(Cipher.DECRYPT_MODE, bcecPrivateKey);
                // 解密
                content = new String(cipher.doFinal(Base64.getDecoder().decode(contentDecrypt)));
    
            } catch (Exception e) { 
                log.info("SM2Utils.encrypt(java.lang.String, java.lang.String) error {}", e.getMessage(), e);
            }
            return content;
        }
    
        /** * sm2 加密 * * @param privateKey 私钥 * @param contentDecrypt 密文 * @return 明文 */
        public static String decrypt(String privateKey, byte[] contentDecrypt) { 
            return decrypt(privateKey, new String(contentDecrypt));
        }
    
    
        public static void main(String[] args) { 
            String privateKey = "dbd874c60c8c7432052c7f881ae23f5939d841b12a105bb38ab97129ed02f92d";
            String publicKey = "033e5250957110884657948ce04507833731e7f88a18569f57f16b7e2abe3a79ad";
            System.out.println(encrypt(publicKey, "content"));
            String contentDecrypt = "BP4DukeJwLi9Xfp97HZ39GvfAsJ+u+1Rr8zK5TXd+b95YkwDuZnwFpCtSWkvfxfpXP5DmuIbRBQW0JUgcZ7SXbi+vGM9TDD3LNEVIlvQ1Z5Z8TcotgYsryL6J0eSwtdmoVbhdBEehRw=";
            System.out.println(decrypt(privateKey, contentDecrypt));
        }
    
    }

参考：  
[https://blog.csdn.net/RisenMyth/article/details/107212156][https_blog.csdn.net_RisenMyth_article_details_107212156]

[https_blog.csdn.net_RisenMyth_article_details_107212156]: https://blog.csdn.net/RisenMyth/article/details/107212156