java实现国密算法（java 国密算法库）

Java 实现国密算法

简介

国密算法，全称国家商用密码算法，是由中国国家密码管理局制定的用于保护国家秘密和商业机密信息的密码算法。Java 是一种广泛使用的编程语言，它可以使用多种国密算法来保护数据安全。

实现国密算法

Java 中可以使用 Bouncy Castle 轻量级加密库来实现国密算法。Bouncy Castle 提供了对多种加密算法的实现，包括国密算法。

详细说明

1. 引入 Bouncy Castle 依赖

在项目中添加 Bouncy Castle 的依赖项：```xml org.bouncycastlebcprov-jdk15on1.70 ```

2. 生成密钥

```java import org.bouncycastle.jce.provider.BouncyCastleProvider; import org.bouncycastle.crypto.generators.SM2KeyPairGenerator; import org.bouncycastle.crypto.params.ECPrivateKeyParameters; import org.bouncycastle.crypto.params.ECPublicKeyParameters;public class KeyGenerater {public static void main(String[] args) {// 注册 Bouncy Castle 提供器Security.addProvider(new BouncyCastleProvider());// 生成 SM2 密钥对SM2KeyPairGenerator generator = new SM2KeyPairGenerator();generator.init(new SM2KeyGenerationParameters(null, null));KeyPair pair = generator.generateKeyPair();// 提取私钥和公钥ECPrivateKeyParameters privateKey = (ECPrivateKeyParameters) pair.getPrivate();ECPublicKeyParameters publicKey = (ECPublicKeyParameters) pair.getPublic();// 保存密钥// ...} } ```

3. 加解密数据

```java import org.bouncycastle.jce.provider.BouncyCastleProvider; import org.bouncycastle.jce.spec.ECNamedCurveParameterSpec; import org.bouncycastle.jce.spec.ECParameterSpec; import org.bouncycastle.jce.spec.ECPrivateKeySpec; import org.bouncycastle.jce.spec.ECPublicKeySpec; import org.bouncycastle.crypto.digests.SM3Digest; import org.bouncycastle.crypto.engines.SM2Engine; import org.bouncycastle.crypto.params.ParametersWithID; import org.bouncycastle.crypto.params.ParametersWithRandom; import org.bouncycastle.crypto.signers.SM2Signer;import java.nio.charset.StandardCharsets; import java.security.KeyFactory; import java.security.SecureRandom; import java.security.Security; import java.security.spec.ECPoint; import java.util.Arrays;public class Encryptor {public static void main(String[] args) throws Exception {// 注册 Bouncy Castle 提供器Security.addProvider(new BouncyCastleProvider());// 加载私钥和公钥byte[] privateKeyBytes = // ...byte[] publicKeyBytes = // ...// 解析私钥ECNamedCurveParameterSpec ecSpec = ECNamedCurveParameterSpec.getByName("sm2p256v1");KeyFactory keyFactory = KeyFactory.getInstance("EC", "BC");ECPrivateKeySpec privateKeySpec = new ECPrivateKeySpec(new BigInteger(1, privateKeyBytes), ecSpec);ECPrivateKeyParameters privateKey = (ECPrivateKeyParameters) keyFactory.generatePrivate(privateKeySpec);// 解析公钥ECPoint w = ecSpec.getCurve().decodePoint(publicKeyBytes);ECPublicKeySpec publicKeySpec = new ECPublicKeySpec(w, ecSpec);ECPublicKeyParameters publicKey = (ECPublicKeyParameters) keyFactory.generatePublic(publicKeySpec);// 加密数据String plaintext = "Hello, world!";byte[] plaintextBytes = plaintext.getBytes(StandardCharsets.UTF_8);SM2Engine engine = new SM2Engine();engine.init(true, new ParametersWithRandom(publicKey, new SecureRandom()));byte[] ciphertext = engine.processBlock(plaintextBytes, 0, plaintextBytes.length);// 解密数据engine.init(false, new ParametersWithID(privateKey, null));byte[] decryptedtext = engine.processBlock(ciphertext, 0, ciphertext.length);String decryptedPlaintext = new String(decryptedtext, StandardCharsets.UTF_8);// 验证签名SM2Signer signer = new SM2Signer();ParametersWithID signerParameters = new ParametersWithID(privateKey, null);signer.init(false, signerParameters);SM3Digest digest = new SM3Digest();digest.update(plaintextBytes, 0, plaintextBytes.length);byte[] signature = signer.generateSignature(digest.digest());// 验证签名signer.init(true, publicKey);if (signer.verifySignature(digest.digest(), signature)) {System.out.println("签名验证成功");} else {System.out.println("签名验证失败");}} } ```

**Java 实现国密算法****简介**国密算法，全称国家商用密码算法，是由中国国家密码管理局制定的用于保护国家秘密和商业机密信息的密码算法。Java 是一种广泛使用的编程语言，它可以使用多种国密算法来保护数据安全。**实现国密算法**Java 中可以使用 Bouncy Castle 轻量级加密库来实现国密算法。Bouncy Castle 提供了对多种加密算法的实现，包括国密算法。**详细说明****1. 引入 Bouncy Castle 依赖**在项目中添加 Bouncy Castle 的依赖项：```xml org.bouncycastlebcprov-jdk15on1.70 ```**2. 生成密钥**```java import org.bouncycastle.jce.provider.BouncyCastleProvider; import org.bouncycastle.crypto.generators.SM2KeyPairGenerator; import org.bouncycastle.crypto.params.ECPrivateKeyParameters; import org.bouncycastle.crypto.params.ECPublicKeyParameters;public class KeyGenerater {public static void main(String[] args) {// 注册 Bouncy Castle 提供器Security.addProvider(new BouncyCastleProvider());// 生成 SM2 密钥对SM2KeyPairGenerator generator = new SM2KeyPairGenerator();generator.init(new SM2KeyGenerationParameters(null, null));KeyPair pair = generator.generateKeyPair();// 提取私钥和公钥ECPrivateKeyParameters privateKey = (ECPrivateKeyParameters) pair.getPrivate();ECPublicKeyParameters publicKey = (ECPublicKeyParameters) pair.getPublic();// 保存密钥// ...} } ```**3. 加解密数据**```java import org.bouncycastle.jce.provider.BouncyCastleProvider; import org.bouncycastle.jce.spec.ECNamedCurveParameterSpec; import org.bouncycastle.jce.spec.ECParameterSpec; import org.bouncycastle.jce.spec.ECPrivateKeySpec; import org.bouncycastle.jce.spec.ECPublicKeySpec; import org.bouncycastle.crypto.digests.SM3Digest; import org.bouncycastle.crypto.engines.SM2Engine; import org.bouncycastle.crypto.params.ParametersWithID; import org.bouncycastle.crypto.params.ParametersWithRandom; import org.bouncycastle.crypto.signers.SM2Signer;import java.nio.charset.StandardCharsets; import java.security.KeyFactory; import java.security.SecureRandom; import java.security.Security; import java.security.spec.ECPoint; import java.util.Arrays;public class Encryptor {public static void main(String[] args) throws Exception {// 注册 Bouncy Castle 提供器Security.addProvider(new BouncyCastleProvider());// 加载私钥和公钥byte[] privateKeyBytes = // ...byte[] publicKeyBytes = // ...// 解析私钥ECNamedCurveParameterSpec ecSpec = ECNamedCurveParameterSpec.getByName("sm2p256v1");KeyFactory keyFactory = KeyFactory.getInstance("EC", "BC");ECPrivateKeySpec privateKeySpec = new ECPrivateKeySpec(new BigInteger(1, privateKeyBytes), ecSpec);ECPrivateKeyParameters privateKey = (ECPrivateKeyParameters) keyFactory.generatePrivate(privateKeySpec);// 解析公钥ECPoint w = ecSpec.getCurve().decodePoint(publicKeyBytes);ECPublicKeySpec publicKeySpec = new ECPublicKeySpec(w, ecSpec);ECPublicKeyParameters publicKey = (ECPublicKeyParameters) keyFactory.generatePublic(publicKeySpec);// 加密数据String plaintext = "Hello, world!";byte[] plaintextBytes = plaintext.getBytes(StandardCharsets.UTF_8);SM2Engine engine = new SM2Engine();engine.init(true, new ParametersWithRandom(publicKey, new SecureRandom()));byte[] ciphertext = engine.processBlock(plaintextBytes, 0, plaintextBytes.length);// 解密数据engine.init(false, new ParametersWithID(privateKey, null));byte[] decryptedtext = engine.processBlock(ciphertext, 0, ciphertext.length);String decryptedPlaintext = new String(decryptedtext, StandardCharsets.UTF_8);// 验证签名SM2Signer signer = new SM2Signer();ParametersWithID signerParameters = new ParametersWithID(privateKey, null);signer.init(false, signerParameters);SM3Digest digest = new SM3Digest();digest.update(plaintextBytes, 0, plaintextBytes.length);byte[] signature = signer.generateSignature(digest.digest());// 验证签名signer.init(true, publicKey);if (signer.verifySignature(digest.digest(), signature)) {System.out.println("签名验证成功");} else {System.out.println("签名验证失败");}} } ```