ecdsa JAVA 私钥推导公钥,有弹性的城堡ECDSA从私钥创建公钥

短命女 2022-08-29 15:40 65阅读 0赞

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I am trying to sign a bitcoin transaction in c#. I have 2 bits of code I am trying to complete. I can create a set of private and public keys using Bouncy castle. I can convert this to wallet import format ok.

I can also generate a bitcoin address from the ECDSA public key.

However, I want to sign a transaction and all I have is my private key. I don’t want to have to import into a wallet and sign. So how can I generate the public key, given only the private key?

I have found a javascript method that does this:

ecparams.getG().multiply(this.priv).getEncoded();

The only way I’ve seen in Bouncy Castle is to generate a random pair.

private static AsymmetricCipherKeyPair GenerateKeys(int keySize)

{

ECKeyPairGenerator gen = new ECKeyPairGenerator();

SecureRandom secureRandom = new SecureRandom();

KeyGenerationParameters keyGenParam = new KeyGenerationParameters(secureRandom, keySize);

gen.Init(keyGenParam);

return gen.GenerateKeyPair();

}

解决方案

If you’re dealing with DER encoded keys, it’s even simpler:

var privateKey = PrivateKeyFactory.CreateKey(bytes) as ECPrivateKeyParameters;

if (privateKey == null)

return null;

Org.BouncyCastle.Math.EC.ECPoint q = privateKey.Parameters.G.Multiply(privateKey.D);

var publicParams = new ECPublicKeyParameters(privateKey.AlgorithmName, q, privateKey.PublicKeyParamSet);

return SubjectPublicKeyInfoFactory.CreateSubjectPublicKeyInfo(publicParams).GetDerEncoded();

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