公鑰

02cd77e007bdc86eeaf9a479ba7a2c22bc0a517ccb3a6975c3f94b4ac93347dea6

Java語言示例

添加Maven依賴

<dependency>
  <groupId>org.bouncycastle</groupId>
  <artifactId>bcprov-jdk15on</artifactId>
  <version>1.65</version>
</dependency>

示例代碼

import org.bouncycastle.asn1.gm.GMNamedCurves;
import org.bouncycastle.asn1.x9.X9ECParameters;
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.ECPublicKeySpec;
import org.bouncycastle.math.ec.ECPoint;
import org.bouncycastle.util.encoders.Hex;

import javax.crypto.Cipher;
import java.security.KeyFactory;
import java.util.Base64;

public class SM2EncryptUtils {

    private static final String publicKey = "02cd77e007bdc86eeaf9a479ba7a2c22bc0a517ccb3a6975c3f94b4ac93347dea6";

    private static Cipher cipher;

    static {
        try {
            BouncyCastleProvider provider = new BouncyCastleProvider();
            // 獲取SM2相關參數(shù)
            X9ECParameters parameters = GMNamedCurves.getByName("sm2p256v1");
            // 橢圓曲線參數(shù)規(guī)格
            ECParameterSpec ecParameterSpec = new ECParameterSpec(parameters.getCurve(), parameters.getG(), parameters.getN(), parameters.getH());
            // 將公鑰HEX字符串轉(zhuǎn)換為橢圓曲線對應的點
            ECPoint ecPoint = parameters.getCurve().decodePoint(Hex.decode(publicKey));
            // 獲取橢圓曲線KEY生成器
            KeyFactory keyFactory = KeyFactory.getInstance("EC", provider);
            // 將橢圓曲線點轉(zhuǎn)為公鑰KEY對象
            BCECPublicKey bcecPublicKey = (BCECPublicKey) keyFactory.generatePublic(new ECPublicKeySpec(ecPoint, ecParameterSpec));
            // 獲取SM2加密器
            cipher = Cipher.getInstance("SM2", provider);
            // 初始化為加密模式
            cipher.init(Cipher.ENCRYPT_MODE, bcecPublicKey);
        } catch (Exception e) {
            e.printStackTrace();
            throw new RuntimeException(e);
        }
    }

    /**
     * SM2 加密
     * @param content 需要加密的內(nèi)容
     * @return 加密后的密文
     */
    public static String encrypt(String content) {
        try {
            String contentEncrypt = Base64.getEncoder().encodeToString(cipher.doFinal(content.getBytes("UTF-8")));
            return contentEncrypt;
        } catch (Exception e) {
            e.printStackTrace();
            throw new RuntimeException(e);
        }
    }

}