我对加密技术非常陌生,但是我的目标是从公钥的字节数组表示中获取X和Y坐标。我正在使用secp256r1曲线。
// get curve
X9ECParameters x9 = ECNamedCurveTable.GetByName("secp256r1");
ECCurve curve = x9.Curve;
// get coordinates from ASN.1 encoded public key point
var asn1 = (Asn1Sequence)Asn1Object.FromByteArray(publicKeyBytes);
var at1 = (DerBitString)asn1[1];
var bytes = at1.GetBytes();
var x = bytes.Skip(1).Take(32).Reverse().ToArray();
var y = bytes.Skip(33).Take(32).Reverse().ToArray();
// get affine X and Y using point on curve from X and Y
var ecPoint = curve.CreatePoint(new Org.BouncyCastle.Math.BigInteger(1, x), new Org.BouncyCastle.Math.BigInteger(1, y));
ECDomainParameters dParams = new ECDomainParameters(curve, ecPoint, x9.N);
ECPublicKeyParameters pubKey = new ECPublicKeyParameters(ecPoint, dParams);
var affineX = pubKey.Q.AffineXCoord.ToBigInteger().ToByteArrayUnsigned();
var affineY = pubKey.Q.AffineYCoord.ToBigInteger().ToByteArrayUnsigned();
// return a tuple of the coordinates
return (affineX, affineY);
我收到了X和Y坐标,但它们可能不正确。我做错了什么?谢谢。