public void TestEncodePoint()
{
ECPoint point = new ECPoint(null, null, ECCurve.Secp256k1);
byte[] result1 = { 0 };
point.EncodePoint(true).Should().BeEquivalentTo(result1);
point = ECCurve.Secp256k1.G;
byte[] result2 = { 4, 121, 190, 102, 126, 249, 220, 187, 172, 85, 160, 98, 149, 206, 135, 11, 7, 2, 155, 252, 219, 45, 206, 40, 217, 89, 242, 129, 91, 22, 248, 23, 152, 72,
58, 218, 119, 38, 163, 196, 101, 93, 164, 251, 252, 14, 17, 8, 168, 253, 23, 180, 72, 166, 133, 84, 25, 156, 71, 208, 143, 251, 16, 212, 184 };
point.EncodePoint(false).Should().BeEquivalentTo(result2);
point.EncodePoint(false).Should().BeEquivalentTo(result2);
byte[] result3 = { 2, 121, 190, 102, 126, 249, 220, 187, 172, 85, 160, 98, 149, 206, 135, 11, 7, 2, 155, 252, 219, 45, 206, 40, 217, 89, 242, 129, 91, 22, 248, 23, 152 };
point.EncodePoint(true).Should().BeEquivalentTo(result3);
point.EncodePoint(true).Should().BeEquivalentTo(result3);
point = ECCurve.Secp256r1.G;
byte[] result4 = { 3, 107, 23, 209, 242, 225, 44, 66, 71, 248, 188, 230, 229, 99, 164, 64, 242, 119, 3, 125, 129, 45, 235, 51, 160, 244, 161, 57, 69, 216, 152, 194, 150 };
point.EncodePoint(true).Should().BeEquivalentTo(result4);
point.EncodePoint(true).Should().BeEquivalentTo(result4);
// Test cache
point = ECPoint.DecodePoint(ECCurve.Secp256r1.G.EncodePoint(true), ECCurve.Secp256r1);
point.EncodePoint(true).Should().BeEquivalentTo(result4);
point.EncodePoint(true).Should().BeEquivalentTo(result4);
byte[] result5 = "046b17d1f2e12c4247f8bce6e563a440f277037d812deb33a0f4a13945d898c2964fe342e2fe1a7f9b8ee7eb4a7c0f9e162bce33576b315ececbb6406837bf51f5".HexToBytes();
point = ECPoint.DecodePoint(ECCurve.Secp256r1.G.EncodePoint(false), ECCurve.Secp256r1);
point.EncodePoint(true).Should().BeEquivalentTo(result4);
point.EncodePoint(true).Should().BeEquivalentTo(result4);
point.EncodePoint(false).Should().BeEquivalentTo(result5);
point.EncodePoint(false).Should().BeEquivalentTo(result5);
}
private ECCurve(BigInteger Q, BigInteger A, BigInteger B, BigInteger N, byte[] G)
{
this.Q = Q;
this.ExpectedECPointLength = ((int)Q.GetBitLength() + 7) / 8;
this.A = new ECFieldElement(A, this);
this.B = new ECFieldElement(B, this);
this.N = N;
this.Infinity = new ECPoint(null, null, this);
this.G = ECPoint.DecodePoint(G, this);
}
public void TestDecodePoint()
{
byte[] input1 = { 0 };
Action action = () => ECPoint.DecodePoint(input1, ECCurve.Secp256k1);
action.Should().Throw <FormatException>();
byte[] input2 = { 4, 121, 190, 102, 126, 249, 220, 187, 172, 85, 160, 98, 149, 206, 135, 11, 7, 2, 155, 252, 219, 45, 206, 40, 217, 89, 242, 129, 91, 22, 248, 23, 152, 72,
58, 218, 119, 38, 163, 196, 101, 93, 164, 251, 252, 14, 17, 8, 168, 253, 23, 180, 72, 166, 133, 84, 25, 156, 71, 208, 143, 251, 16, 212, 184 };
ECPoint.DecodePoint(input2, ECCurve.Secp256k1).Should().Be(ECCurve.Secp256k1.G);
action = () => ECPoint.DecodePoint(input2.Take(32).ToArray(), ECCurve.Secp256k1);
action.Should().Throw <FormatException>();
byte[] input3 = { 2, 121, 190, 102, 126, 249, 220, 187, 172, 85, 160, 98, 149, 206, 135, 11, 7, 2, 155, 252, 219, 45, 206, 40, 217, 89, 242, 129, 91, 22, 248, 23, 152 };
byte[] input4 = { 3, 107, 23, 209, 242, 225, 44, 66, 71, 248, 188, 230, 229, 99, 164, 64, 242, 119, 3, 125, 129, 45, 235, 51, 160, 244, 161, 57, 69, 216, 152, 194, 150 };
ECPoint.DecodePoint(input3, ECCurve.Secp256k1).Should().Be(ECCurve.Secp256k1.G);
ECPoint.DecodePoint(input4, ECCurve.Secp256r1).Should().Be(ECCurve.Secp256r1.G);
action = () => ECPoint.DecodePoint(input3.Take(input3.Length - 1).ToArray(), ECCurve.Secp256k1);
action.Should().Throw <FormatException>();
}
