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 TupleHashCompute_Should_GenerateExpectedHash()
{
var expectedHash = "3696FB515910C43033D7BE0DD1ABFA4F3F8D8354EEC017D41F9" +
"3A344C9AAB02C006771824DC09C5040BEC8CE9C5FD3833D1301B62750726160098E9A1ED440E4";
var arr1 = new byte[] { 0x00, 0x01, 0x02 };
var arr2 = new byte[] { 0x10, 0x11, 0x12, 0x13, 0x14, 0x15 };
var arr3 = new byte[] { 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28 };
var domain = Bytes.FromString("My Tuple App");
var tupleHash = new SHA512Helper();
var hash = tupleHash.ComputeHash(domain, arr1, arr2, arr3);
Assert.Equal(expectedHash, Bytes.ToString(hash, StringEncoding.HEX).ToUpper());
}
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());
}
}
private static byte[] ComputeHash(byte[] content, string algorithm)
{
switch (algorithm.ToUpper())
{
case "MD5":
return(MD5Helper.ComputeHash(content));
case "SHA256":
return(SHA256Helper.ComputeHash(content));
case "SHA384":
return(SHA384Helper.ComputeHash(content));
case "SHA512":
return(SHA512Helper.ComputeHash(content));
default:
return(SHA1Helper.ComputeHash(content));
}
}
public void HkdfGenerateBytes_Should_GenerateExpectedValue()
{
var expectedValue =
"0F097707AAB66A4CD5FCC79CEB96FB4B99DE2E73DF09295E" +
"CFF6F6CC7C1DCF169D51B62999BC206487800E8DD451518FA6C50F5C053B8B780208BE7164D3A7F2";
var arr1 = new byte[] { 0x00, 0x01, 0x02 };
var arr2 = new byte[] { 0x10, 0x11, 0x12, 0x13, 0x14, 0x15 };
var arr3 = new byte[] { 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28 };
var domain = Bytes.FromString("My Tuple App");
var sha512 = new SHA512Helper();
var key = sha512.ComputeHash(null, arr1, arr2, arr3);
var hkdf = new HkdfBytesGenerator(new Sha512Digest());
var phe = new PheCrypto();
hkdf.Init(new HkdfParameters(key, domain, Domains.KdfInfoZ));
var resultValue = new byte[64];
hkdf.GenerateBytes(resultValue, 0, resultValue.Length);
Assert.Equal(expectedValue, Bytes.ToString(resultValue, StringEncoding.HEX).ToUpper());
}