Java实现数字签名：RSA、DSA、ECDSA

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RSA

import org.apache.commons.codec.binary.Hex;

import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.Signature;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;

/**
 * RSA
 *
 * @author liuming
 * @create 2018/4/13
 */
public class RSA {

    private static String srcMsg = "imooc security rsa";

    public static void main(String[] args) {
        jdkRSA(srcMsg);

    }

    public static void jdkRSA(String srcMsg) {
        try {
            // 初始化密钥
            KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");
            keyPairGenerator.initialize(512);
            KeyPair keyPair = keyPairGenerator.generateKeyPair();
            RSAPublicKey rsaPublicKey = (RSAPublicKey) keyPair.getPublic();
            RSAPrivateKey rsaPrivateKey = (RSAPrivateKey) keyPair.getPrivate();

            // 执行签名
            PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(rsaPrivateKey.getEncoded());
            KeyFactory keyFactory = KeyFactory.getInstance("RSA");
            PrivateKey privateKey = keyFactory.generatePrivate(pkcs8EncodedKeySpec);
            Signature signature = Signature.getInstance("MD5withRSA");
            signature.initSign(privateKey);
            signature.update(srcMsg.getBytes());
            byte[] bytes = signature.sign();
            System.out.println(Hex.encodeHexString(bytes));

            // 验证签名
            X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpec(rsaPublicKey.getEncoded());
            keyFactory = KeyFactory.getInstance("RSA");
            PublicKey publicKey = keyFactory.generatePublic(x509EncodedKeySpec);
            signature = Signature.getInstance("MD5withRSA");
            signature.initVerify(publicKey);
            signature.update(srcMsg.getBytes());
            boolean verfied = signature.verify(bytes);
            System.out.println(verfied);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}

DSA

import org.apache.commons.codec.binary.Hex;

import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.Signature;
import java.security.interfaces.DSAPrivateKey;
import java.security.interfaces.DSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;

/**
 * DSS（Digital Signature Standard） 数字签名标准
 * DSA（Digital Signature Algorithm） 数字签名算法
 *
 * @author liuming
 * @create 2018/4/13
 */
public class DSA {

    private static String srcMsg = "imooc security dsa";

    public static void main(String[] args) {
        jdkDSA(srcMsg);

    }

    public static void jdkDSA(String srcMsg) {
        try {
            // 初始化密钥
            KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("DSA");
            keyPairGenerator.initialize(512);
            KeyPair keyPair = keyPairGenerator.generateKeyPair();
            DSAPublicKey dsaPublicKey = (DSAPublicKey) keyPair.getPublic();
            DSAPrivateKey dsaPrivateKey = (DSAPrivateKey) keyPair.getPrivate();

            // 执行签名
            PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(dsaPrivateKey.getEncoded());
            KeyFactory keyFactory = KeyFactory.getInstance("DSA");
            PrivateKey privateKey = keyFactory.generatePrivate(pkcs8EncodedKeySpec);
            Signature signature = Signature.getInstance("SHA1withDSA");
            signature.initSign(privateKey);
            signature.update(srcMsg.getBytes());
            byte[] bytes = signature.sign();
            System.out.println(Hex.encodeHexString(bytes));

            // 验证签名
            X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpec(dsaPublicKey.getEncoded());
            keyFactory = KeyFactory.getInstance("DSA");
            PublicKey publicKey = keyFactory.generatePublic(x509EncodedKeySpec);
            signature = Signature.getInstance("SHA1withDSA");
            signature.initVerify(publicKey);
            signature.update(srcMsg.getBytes());
            boolean verfied = signature.verify(bytes);
            System.out.println(verfied);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}

ECDSA

import org.apache.commons.codec.binary.Hex;

import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.Signature;
import java.security.interfaces.ECPrivateKey;
import java.security.interfaces.ECPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;

/**
 * ECDSA（Elliptic Curve Digital Signature Algorithm） 椭圆曲线数字签名算法
 *
 * @author liuming
 * @create 2018/4/13
 */
public class ECDSA {

    private static String srcMsg = "imooc security ecdsa";

    public static void main(String[] args) {
        jdkECDSA(srcMsg);

    }

    public static void jdkECDSA(String srcMsg) {
        try {
            // 初始化密钥
            KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("EC");
            keyPairGenerator.initialize(256);
            KeyPair keyPair = keyPairGenerator.generateKeyPair();
            ECPublicKey ecPublicKey = (ECPublicKey) keyPair.getPublic();
            ECPrivateKey ecPrivateKey = (ECPrivateKey) keyPair.getPrivate();

            // 执行签名
            PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(ecPrivateKey.getEncoded());
            KeyFactory keyFactory = KeyFactory.getInstance("EC");
            PrivateKey privateKey = keyFactory.generatePrivate(pkcs8EncodedKeySpec);
            Signature signature = Signature.getInstance("SHA1withECDSA");
            signature.initSign(privateKey);
            signature.update(srcMsg.getBytes());
            byte[] bytes = signature.sign();
            System.out.println(Hex.encodeHexString(bytes));

            // 验证签名
            X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpec(ecPublicKey.getEncoded());
            keyFactory = KeyFactory.getInstance("EC");
            PublicKey publicKey = keyFactory.generatePublic(x509EncodedKeySpec);
            signature = Signature.getInstance("SHA1withECDSA");
            signature.initVerify(publicKey);
            signature.update(srcMsg.getBytes());
            boolean verfied = signature.verify(bytes);
            System.out.println(verfied);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}