目录
具体Java代码SM2算法加解密实现Demo：
pom依赖引入 ：
国家密码管理局于2010年12月17日发布了SM2算法，并要求现有的基于RSA算法的电子认证系统、密钥管理系统、应用系统进升级改造，使用支持国密SM2算法的证书。
基于ECC椭圆曲线算法的SM2算法，则普遍采用256位密钥长度，它的单位安全强度相对较高，在工程应用中比较难以实现，破译或求解难度基本上是指数级的。因此，SM2算法可以用较少的计算能力提供比RSA算法更高的安全强度，而所需的密钥长度却远比RSA算法低。 文章来源：https://www.toymoban.com/news/detail-544644.html
| 对比项目 | ECC加密算法 | RSA加密算法 |
| 密钥长度 | 256位 | 2048位 |
| CPU占用 | 较少 | 较高 |
| 内存占用 | 较少 | 较高 |
| 网络消耗 | 较低 | 较高 |
| 加密效率 | 较高 | 一般 |
| 破解难度 | 具有数据特性，破解难度大 | 相对ECC理论上容易些 |
| 抗攻击性 | 强 | 一般 |
| 可扩展性 | 强 | 一般 |
| 兼容范围 | 支持新版浏览器和操作系统，但存在少数不支持平台，例如cPanel | 广泛支持 |
具体Java代码SM2算法加解密实现Demo：
package org.example;
import org.bouncycastle.asn1.gm.GMNamedCurves;
import org.bouncycastle.asn1.x9.X9ECParameters;
import org.bouncycastle.crypto.engines.SM2Engine;
import org.bouncycastle.crypto.params.ECDomainParameters;
import org.bouncycastle.crypto.params.ECPrivateKeyParameters;
import org.bouncycastle.crypto.params.ECPublicKeyParameters;
import org.bouncycastle.crypto.params.ParametersWithRandom;
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.util.encoders.Hex;
import java.math.BigInteger;
import java.security.*;
import java.security.spec.ECGenParameterSpec;
/**
* @ClassName SM2Utils
* @Description SM2算法工具类
*/
public class SM2Utils {
public static KeyPair createECKeyPair() {
final ECGenParameterSpec sm2Spec = new ECGenParameterSpec("sm2p256v1");
// 获取一个椭圆曲线类型的密钥对生成器
final KeyPairGenerator kpg;
try {
kpg = KeyPairGenerator.getInstance("EC", new BouncyCastleProvider());
kpg.initialize(sm2Spec, new SecureRandom());
return kpg.generateKeyPair();
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
public static String encrypt(String publicKeyHex, String data) {
return encrypt(getECPublicKeyByPublicKeyHex(publicKeyHex), data, 1);
}
public static String encrypt(BCECPublicKey publicKey, String data, int modeType) {
//加密模式
SM2Engine.Mode mode = SM2Engine.Mode.C1C3C2;
if (modeType != 1) {
mode = SM2Engine.Mode.C1C2C3;
}
ECParameterSpec ecParameterSpec = publicKey.getParameters();
ECDomainParameters ecDomainParameters = new ECDomainParameters(ecParameterSpec.getCurve(),
ecParameterSpec.getG(), ecParameterSpec.getN());
ECPublicKeyParameters ecPublicKeyParameters = new ECPublicKeyParameters(publicKey.getQ(), ecDomainParameters);
SM2Engine sm2Engine = new SM2Engine(mode);
sm2Engine.init(true, new ParametersWithRandom(ecPublicKeyParameters, new SecureRandom()));
byte[] arrayOfBytes = null;
try {
byte[] in = data.getBytes("utf-8");
arrayOfBytes = sm2Engine.processBlock(in, 0, in.length);
} catch (Exception e) {
System.out.println("SM2加密时出现异常:" + e.getMessage());
e.printStackTrace();
}
return Hex.toHexString(arrayOfBytes);
}
public static String decrypt(String privateKeyHex, String cipherData) {
return decrypt(getBCECPrivateKeyByPrivateKeyHex(privateKeyHex), cipherData, 1);
}
public static String decrypt(BCECPrivateKey privateKey, String cipherData, int modeType) {
//解密模式
SM2Engine.Mode mode = SM2Engine.Mode.C1C3C2;
if (modeType != 1)
mode = SM2Engine.Mode.C1C2C3;
byte[] cipherDataByte = Hex.decode(cipherData);
ECParameterSpec ecParameterSpec = privateKey.getParameters();
ECDomainParameters ecDomainParameters = new ECDomainParameters(ecParameterSpec.getCurve(),
ecParameterSpec.getG(), ecParameterSpec.getN());
ECPrivateKeyParameters ecPrivateKeyParameters = new ECPrivateKeyParameters(privateKey.getD(),
ecDomainParameters);
SM2Engine sm2Engine = new SM2Engine(mode);
sm2Engine.init(false, ecPrivateKeyParameters);
String result = null;
try {
byte[] arrayOfBytes = sm2Engine.processBlock(cipherDataByte, 0, cipherDataByte.length);
result = new String(arrayOfBytes, "utf-8");
} catch (Exception e) {
System.out.println("SM2解密时出现异常" + e.getMessage());
}
return result;
}
private static X9ECParameters x9ECParameters = GMNamedCurves.getByName("sm2p256v1");
private static ECParameterSpec ecDomainParameters = new ECParameterSpec(x9ECParameters.getCurve(), x9ECParameters.getG(), x9ECParameters.getN());
public static BCECPublicKey getECPublicKeyByPublicKeyHex(String pubKeyHex) {
if (pubKeyHex.length() > 128) {
pubKeyHex = pubKeyHex.substring(pubKeyHex.length() - 128);
}
String stringX = pubKeyHex.substring(0, 64);
String stringY = pubKeyHex.substring(stringX.length());
BigInteger x = new BigInteger(stringX, 16);
BigInteger y = new BigInteger(stringY, 16);
ECPublicKeySpec ecPublicKeySpec = new ECPublicKeySpec(x9ECParameters.getCurve().createPoint(x, y), ecDomainParameters);
return new BCECPublicKey("EC", ecPublicKeySpec, BouncyCastleProvider.CONFIGURATION);
}
public static BCECPrivateKey getBCECPrivateKeyByPrivateKeyHex(String privateKeyHex) {
BigInteger d = new BigInteger(privateKeyHex, 16);
ECPrivateKeySpec ecPrivateKeySpec = new ECPrivateKeySpec(d, ecDomainParameters);
return new BCECPrivateKey("EC", ecPrivateKeySpec, BouncyCastleProvider.CONFIGURATION);
}
public static void main(String[] args) {
String publicKeyHex = null;
String privateKeyHex = null;
KeyPair keyPair = createECKeyPair();
PublicKey publicKey = keyPair.getPublic();
if (publicKey instanceof BCECPublicKey) {
//获取65字节非压缩缩的十六进制公钥串(0x04)
publicKeyHex = Hex.toHexString(((BCECPublicKey) publicKey).getQ().getEncoded(false));
System.out.println("SM2公钥：" + publicKeyHex);
}
PrivateKey privateKey = keyPair.getPrivate();
if (privateKey instanceof BCECPrivateKey) {
//获取32字节十六进制私钥串
privateKeyHex = ((BCECPrivateKey) privateKey).getD().toString(16);
System.out.println("SM2私钥：" + privateKeyHex);
}
/**
* 公钥加密
*/
String data = "=========需要加密的数据=========";
//将十六进制公钥串转换为 BCECPublicKey 公钥对象
String encryptData = encrypt(publicKeyHex, data);
System.out.println("加密结果：" + encryptData);
/**
* 私钥解密
*/
//将十六进制私钥串转换为 BCECPrivateKey 私钥对象
data = decrypt(privateKeyHex, encryptData);
System.out.println("解密结果：" + data);
}
}
pom依赖引入 ：
<dependency>
<groupId>org.bouncycastle</groupId>
<artifactId>bcprov-jdk15to18</artifactId>
<version>1.68</version>
</dependency>文章来源地址https://www.toymoban.com/news/detail-544644.html
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