问题描述
当我尝试在C#的Bouncy Castle中验证ECDSA签名时遇到问题。该代码是从我拥有的Java示例中采用的,因此我100%确保公钥和签名正确。但是C#实现总是返回签名无效。我检查了曲线参数,它们是正确的。我尝试使用DER和原始签名,但再次失败了。
I have a problem when I try to verify the ECDSA signature in Bouncy Castle in C#. The code is adopted from Java example that I have, so I am 100% sure that the public key and signature are correct. But the C# implementation always returns that the signature is not valid. I checked the curve parameters and they are correct. I tried with DER and "raw" signature and again it did not work.
有人可以发现我在做什么吗?
Can anybody spot what I am doing wrong:
namespace TestECDSA
{
class Program
{
static void Main(string[] args)
{
byte[] b = new byte[] { 0x2B, 0xA1, 0x41, 0x00 };
string pubKey = "044F6D3F294DEA5737F0F46FFEE88A356EED95695DD7E0C27A591E6F6F65962BAF";
string signature = "AAD03D3D38CE53B673CF8F1C016C8D3B67EA98CBCF72627788368C7C54AA2FC4";
X9ECParameters curve = SecNamedCurves.GetByName("secp128r1");
ECDomainParameters curveSpec = new ECDomainParameters(curve.Curve, curve.G, curve.N, curve.H, curve.GetSeed());
ECPublicKeyParameters key = new ECPublicKeyParameters("ECDSA", curve.Curve.DecodePoint(Hex.Decode(pubKey)), curveSpec);
ISigner signer = SignerUtilities.GetSigner("NONEwithECDSA");
signer.Init(false, key);
signer.BlockUpdate(b, 0, b.Length);
if (signer.VerifySignature(derEncodeSignature(Hex.Decode(signature))))
System.Console.WriteLine("Verified Signature");
else
System.Console.WriteLine("Not Verified Signature");
}
public static byte[] derEncodeSignature(byte[] signature)
{
byte[] encoded = new byte[6 + signature.Length];
byte[] r = RangeSubset(signature, 0, 16);
byte[] s = RangeSubset(signature, 16, 16);
encoded[0] = 0x30;
encoded[1] = 0x24;
encoded[2] = 0x02;
encoded[3] = 0x10;
encoded[4 + r.Length] = 0x02;
encoded[5 + r.Length] = 0x10;
Array.Copy(r, 0, encoded, 4, r.Length);
Array.Copy(s, 0, encoded, 6 + r.Length, r.Length);
return encoded;
}
public static T[] RangeSubset<T>(T[] array, int startIndex, int length)
{
T[] subset = new T[length];
Array.Copy(array, startIndex, subset, 0, length);
return subset;
}
}
}
推荐答案
您可以像这样使用signer.GenerateSignature()来代替DER自己对签名进行编码:
Instead of DER-encoding the signature by yourself, you can use signer.GenerateSignature() like so:
var signerAlgorithm = "SHA256withECDSA";
ISigner signer = SignerUtilities.GetSigner(signerAlgorithm);
signer.Init(true, privateSigningKey);
signer.BlockUpdate(data, 0, data.Length);
byte[] signature = signer.GenerateSignature();
return signature;
这篇关于用C#中的Bouncy Castle验证ECDSA签名的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!