SM2加密实现之JAVA方式

迈不过友情╰ 2023-10-13 21:05 50阅读 0赞

package com.xxx.tax.util;
    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;
        }
        
    	public static String printHexString(byte[] b) {
            StringBuilder builder = new StringBuilder();
            for (int i = 0; i < b.length; i++) {
                String hex = Integer.toHexString(b[i] & 0xFF);
                if (hex.length() == 1) {
                    builder.append('0'+hex);
                    hex = '0' + hex;
                }else {
                	 builder.append(hex);
                }
                //System.out.print(hex.toLowerCase());
               
            }
            System.out.println(builder.toString());
            return builder.toString();
        }
    
        /**
         * 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 printHexString(contentEncrypt.getBytes());
            //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 publicKey = "043048E9968B72DDF70983B8E305217D94C1E02A5BD4875B625ACC3B13512641A7AD7DF0A1A39F453675EB4B085D8B9E05433E91DBE716E80A7219C2485F28B01F";
            System.out.println(encrypt(publicKey, "8F6190402EC4F423"));
        }
    
    }

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