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c# - 使用 BouncyCastle SHA-256withPLAIN-ECDSA 的确定性签名

问题描述

我目前正在使用如下所示的代码进行签名。我正在尝试找到一种创建确定性签名的方法。BouncyCastle 有可能吗？

var curve = SecNamedCurves.GetByName("secp256r1");
var domain = new ECDomainParameters(curve.Curve, curve.G, curve.N, curve.H);

var p = new Org.BouncyCastle.Math.BigInteger(privateKey);

var keyParameters = new ECPrivateKeyParameters(
                        new Org.BouncyCastle.Math.BigInteger(1,privateKey),
                        domain);

ISigner signer = SignerUtilities.GetSigner("SHA-256withPLAIN-ECDSA");

signer.Init(true, keyParameters);
signer.BlockUpdate(message, 0, message.Length);
var signature = signer.GenerateSignature();

标签： c#cryptographybouncycastle

解决方案

是的。下面显示了使用曲线 P-256 aka secp256r1 和来自RFC6979, A.2.5的测试向量生成具有确定性 ECDSA 的签名：

  • 测试向量：

私钥：
x = C9AFA9D845BA75166B5C215767B1D6934E50C3DB36E89B127B8A622B120F6721

使用 SHA-256，消息 = “样本”：
r = EFD48B2AACB6A8FD1140DD9CD45E81D69D2C877B56AAF991C34D0EA84EAF3716
s = F7CB1C942D657C41D436C7A1B6E29F65F3E900DBB9AFF4064DC4ACDA88

  • C#/BC 代码
using Org.BouncyCastle.Asn1.Sec;
using Org.BouncyCastle.Asn1.X9;
using Org.BouncyCastle.Crypto.Digests;
using Org.BouncyCastle.Crypto.Parameters;
using Org.BouncyCastle.Crypto.Signers;
using Org.BouncyCastle.Math;
using Org.BouncyCastle.Utilities.Encoders;
using System;
using System.Text;
...
string messageToSign = "sample";
var digest = new System.Security.Cryptography.SHA256Managed();
byte[] messageHash = digest.ComputeHash(Encoding.UTF8.GetBytes(messageToSign));

X9ECParameters x9Params = SecNamedCurves.GetByName("secp256r1"); ;
ECDomainParameters ecParams = new ECDomainParameters(x9Params.Curve, x9Params.G, x9Params.N, x9Params.H);
ECPrivateKeyParameters privKey = new ECPrivateKeyParameters(new BigInteger(1, Hex.Decode("C9AFA9D845BA75166B5C215767B1D6934E50C3DB36E89B127B8A622B120F6721")), ecParams);
ECDsaSigner signer = new ECDsaSigner(new HMacDsaKCalculator(new Sha256Digest()));
signer.Init(true, privKey);
var signature = signer.GenerateSignature(messageHash);

Console.WriteLine(signature[0].ToString(16).ToUpper()); // r: EFD48B2AACB6A8FD1140DD9CD45E81D69D2C877B56AAF991C34D0EA84EAF3716
Console.WriteLine(signature[1].ToString(16).ToUpper()); // s: F7CB1C942D657C41D436C7A1B6E29F65F3E900DBB9AFF4064DC4AB2F843ACDA8

输出：

EFD48B2AACB6A8FD1140DD9CD45E81D69D2C877B56AAF991C34D0EA84EAF3716
F7CB1C942D657C41D436C7A1B6E29F65F3E900DBB9AFF4064DC4AB2F843ACDA8

匹配测试向量的签名。

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