Question

我想在c＃中签署一个比特币交易。我有2位代码我想完成。我可以使用Bouncy城堡创建一组私钥和公钥。我可以将其转换为钱包导入格式确定。

我还可以从ECDSA公钥生成比特币地址。

但是，我想签署一个交易，我拥有的只是我的私钥。我不想导入钱包和签名。那么只有私钥才能生成公钥？

我找到了一个执行此操作的javascript方法：

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

我在Bouncy Castle中看到的唯一方法是生成一对随机。

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();
}

Answer 1

从斯坦宁格的回答中，我得到以下内容来处理我的样本密钥。

using Org.BouncyCastle.Asn1.Sec;
using Org.BouncyCastle.Asn1.X9;
using Org.BouncyCastle.Crypto.Parameters;
using Org.BouncyCastle.Math;
using Org.BouncyCastle.Math.EC;

public static class Example
{
    private static X9ECParameters curve = SecNamedCurves.GetByName("secp256k1");
    private static ECDomainParameters domain = new ECDomainParameters(curve.Curve, curve.G, curve.N, curve.H);

    public static byte[] ToPublicKey(byte[] privateKey)
    {
        BigInteger d = new BigInteger(privateKey);
        ECPoint q = domain.G.Multiply(d);

        var publicParams = new ECPublicKeyParameters(q, domain);
        return publicParams.Q.GetEncoded();
    }
}

Answer 2

看看下面的代码。私钥在此示例中由as64编码的字符串给出，并且还返回base64编码的字符串。注释的keyParameters正在工作，所以如果你想拥有键和曲线，请使用这个。

private static readonly Org.BouncyCastle.Asn1.X9.X9ECParameters curve = Org.BouncyCastle.Asn1.Sec.SecNamedCurves.GetByName("secp256r1");
private static readonly Org.BouncyCastle.Crypto.Parameters.ECDomainParameters domain = new Org.BouncyCastle.Crypto.Parameters.ECDomainParameters(curve.Curve, curve.G, curve.N, curve.H);
public string GetPublicKey(string privKey)
{
      Org.BouncyCastle.Math.BigInteger d = new Org.BouncyCastle.Math.BigInteger(Convert.FromBase64String(privKey));
      //var privKeyParameters = new Org.BouncyCastle.Crypto.Parameters.ECPrivateKeyParameters(d, domain);
      Org.BouncyCastle.Math.EC.ECPoint q = domain.G.Multiply(d);
      //var pubKeyParameters = new Org.BouncyCastle.Crypto.Parameters.ECPublicKeyParameters(q, domain);
      return Convert.ToBase64String(q.GetEncoded());
}

Answer 3

如果要处理DER编码的键，则更加简单：

  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();

Bouncy Castle ESCDA从私钥创建公钥

3 个答案: