在 BouncyCastle 上实施数字签名算法 (ECDSA) 的椭圆曲线

2022-01-10 00:00:00 cryptography bouncycastle java

我正在尝试实现 ECDSA(椭圆曲线数字签名算法)，但我在 Java 中找不到任何使用 Bouncy Castle 的示例.我创建了密钥，但我真的不知道应该使用什么样的函数来创建签名并验证它.

I am trying to implement ECDSA (Elliptic Curve Digital Signature Algorithm) but I couldn't find any examples in Java which use Bouncy Castle. I created the keys, but I really don't know what kind of functions I should use to create a signature and verify it.

public static KeyPair GenerateKeys()
    throws NoSuchAlgorithmException, NoSuchProviderException, InvalidAlgorithmParameterException
{
    ECParameterSpec ecSpec = ECNamedCurveTable.getParameterSpec("B-571");
    KeyPairGenerator g = KeyPairGenerator.getInstance("ECDSA", "BC");
    g.initialize(ecSpec, new SecureRandom());
    return g.generateKeyPair();
}

推荐答案

owlstead 是正确的.更详细地说，你可以这样做:

owlstead is correct. And to elaborate a bit more, you can do this:

KeyPair pair = GenerateKeys();
Signature ecdsaSign = Signature.getInstance("SHA256withECDSA", "BC");
ecdsaSign.initSign(pair.getPrivate());
ecdsaSign.update(plaintext.getBytes("UTF-8"));
byte[] signature = ecdsaSign.sign();

并验证:

Signature ecdsaVerify = Signature.getInstance("SHA256withECDSA", "BC");
ecdsaVerify.initVerify(pair.getPublic());
ecdsaVerify.update(plaintext.getBytes("UTF-8"));
boolean result = ecdsaVerify.verify(signature);

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