数字签名算法_ECDSA

最新推荐文章于 2024-03-12 11:14:30 发布

原创最新推荐文章于 2024-03-12 11:14:30 发布 · 1.4k 阅读

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#java #ECDSA #签名

ECDSA:椭圆曲线数字签名算法。

jdk7的第四个版本提供了对ECDSA的支持。

ECDS的签名算法代码：

public static void jdkEcdsa(String data) {
    try {
        //1.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();

        //2.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(data.getBytes());
        //加密结果
        byte[] result = signature.sign();

        //3.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(data.getBytes());

        //验证结果
        boolean isOk = signature.verify(result);
        System.out.println("验证结果:" + isOk);
    } catch (Exception e) {
        e.printStackTrace();
    }

}