public void SwuHashToPoint_Should_ReturnExpectedPoint()
{
var data = new byte[]
{
0x02, 0x6c, 0x68, 0xba, 0x79, 0x9b, 0x95, 0x8d,
0xa1, 0xdd, 0xec, 0x47, 0xcf, 0x77, 0xb6, 0x1a,
0x68, 0xe3, 0x27, 0xbb, 0x16, 0xdd, 0x04, 0x6f,
0x90, 0xfe, 0x2d, 0x7e, 0x46, 0xc7, 0x86, 0x1b,
0xf9, 0x7a, 0xdb, 0xda, 0x15, 0xef, 0x5c, 0x13,
0x63, 0xe7, 0x0d, 0x7c, 0xfa, 0x78, 0x24, 0xca,
0xb9, 0x29, 0x74, 0x96, 0x09, 0x47, 0x15, 0x4d,
0x34, 0xc4, 0x38, 0xe3, 0xeb, 0xcf, 0xfc, 0xbc,
};
var phe = new PheCrypto();
var a = phe.Curve;
var expectedX = "41644486759784367771047752285976210905566569374059610763941558650382638987514";
var expectedY = "47123545766650584118634862924645280635136629360149764686957339607865971771956";
// var curveParams = NistNamedCurves.GetByName("P-256");
var swu = new Swu(phe.Curve.Q, phe.Curve.B.ToBigInteger());
var(x, y) = swu.DataToPoint(data);
Assert.Equal(expectedX, x.ToString());
Assert.Equal(expectedY, y.ToString());
}
private FpPoint MakePoint()
{
var rng = new SecureRandom();
var phe = new PheCrypto();
var swu = new Swu(phe.Curve.Q, phe.Curve.B.ToBigInteger());
var random = new byte[Swu.PointHashLen];
rng.NextBytes(random);
var(x, y) = swu.HashToPoint(random);
var xField = phe.Curve.FromBigInteger(x);
var yField = phe.Curve.FromBigInteger(y);
var ecpoint = phe.Curve.CreatePoint(x, y);
return((FpPoint)ecpoint);
}
public void HashToPoint_Should_GeneratePointOnCurve_When_RandomHashesArePassed()
{
var phe = new PheCrypto();
var swu = new Swu(phe.Curve.Q, phe.Curve.B.ToBigInteger());
var rng = new SecureRandom();
var sha512 = new SHA512Helper();
var random = new byte[32];
for (int i = 0; i <= 15000; i++)
{
rng.NextBytes(random);
var hash = sha512.ComputeHash(null, random);
var(x, y) = swu.DataToPoint(hash);
Assert.True(phe.Curve.CreatePoint(x, y).IsValid());
}
}
public void TestPoint_Encoding()
{
var rng = new SecureRandom();
var phe = new PheCrypto();
var swu = new Swu(phe.Curve.Q, phe.Curve.B.ToBigInteger());
var random = new byte[Swu.PointHashLen];
rng.NextBytes(random);
var(x, y) = swu.HashToPoint(random);
var xField = phe.Curve.FromBigInteger(x);
var yField = phe.Curve.FromBigInteger(y);
var ecpoint = phe.Curve.CreatePoint(x, y);
var encoded = ecpoint.GetEncoded();
var decoded = phe.Curve.DecodePoint(encoded);
Assert.Equal(ecpoint, decoded);
}
public void HashToPoint_Should_GeneratePointOnCurve_When_RandomHashesArePassed2()
{
var phe = new PheCrypto();
var swu = new Swu(phe.Curve.Q, phe.Curve.B.ToBigInteger());
var sha512 = new SHA512Helper();
var data = new byte[]
{
0x80, 0x39, 0x05, 0x35, 0x49, 0x44, 0x70, 0xbe,
0x0b, 0x29, 0x65, 0x01, 0x58, 0x6b, 0xfc, 0xd9,
0xe1, 0x31, 0xc3, 0x9e, 0x2d, 0xec, 0xc7, 0x53,
0xd4, 0xf2, 0x5f, 0xdd, 0xd2, 0x28, 0x1e, 0xe3,
};
var hash = sha512.ComputeHash(null, data);
for (int i = 0; i <= 15000; i++)
{
var(x, y) = swu.DataToPoint(hash);
Assert.True(phe.Curve.CreatePoint(x, y).IsValid());
hash = sha512.ComputeHash(null, hash);
}
}
public void Should_GeneratePointOnCurve_When_RandomHashesArePassed()
{
var curveParams = NistNamedCurves.GetByName("P-256");
var swu = new Swu(((FpCurve)curveParams.Curve).Q, curveParams.Curve.B.ToBigInteger());
var rng = new SecureRandom();
var sha = new Sha512tDigest(256);
var random = new byte[32];
for (int i = 0; i <= 10000; i++)
{
var hash = new byte[32];
rng.NextBytes(random);
sha.BlockUpdate(random, 0, random.Length);
sha.DoFinal(hash, 0);
var(x, y) = swu.HashToPoint(hash);
Assert.True(curveParams.Curve.CreatePoint(x, y).IsValid());
sha.Reset();
}
}
