public void Test_11_X25519_TestVector_2()
{
byte[] A = Hashes.StringToBinary("4b66e9d4d1b4673c5ad22691957d6af5c11b6421e0ea01d42ca4169e7918ba0d");
A[0] &= 248;
A[31] &= 127;
A[31] |= 64;
BigInteger N0 = new BigInteger(A);
BigInteger N = BigInteger.Parse("35156891815674817266734212754503633747128614016119564763269015315466259359304");
Assert.AreEqual(N, N0);
A = Hashes.StringToBinary("e5210f12786811d3f4b7959d0538ae2c31dbe7106fc03c3efc4cd549c715a493");
A[31] &= 127;
BigInteger U0 = new BigInteger(A);
BigInteger U = BigInteger.Parse("8883857351183929894090759386610649319417338800022198945255395922347792736741");
Assert.AreEqual(U, U0);
A = Hashes.StringToBinary("95cbde9476e8907d7aade45cb4b873f88b595a68799fa152e6f8f7647aac7957");
BigInteger NU0 = new BigInteger(A);
MontgomeryCurve C = new Curve25519();
BigInteger NU = C.ScalarMultiplication(N, U);
Assert.AreEqual(NU0, NU);
}
private void X25519_TestVector_3(int i, string HexResult)
{
MontgomeryCurve C = new Curve25519();
BigInteger N = 9;
BigInteger U = 9;
BigInteger NU;
while (i-- > 0)
{
byte[] NBin = N.ToByteArray();
if (NBin.Length != 32)
{
Array.Resize <byte>(ref NBin, 32);
}
NBin[0] &= 0xf8;
NBin[31] &= 0x3f;
NBin[31] |= 0x40;
NU = C.ScalarMultiplication(NBin, U);
U = N;
N = NU;
}
byte[] A = Hashes.StringToBinary(HexResult);
BigInteger NU0 = new BigInteger(A);
Assert.AreEqual(NU0, NU);
}
public void Curve25519Test1()
{
byte[] alicesk = new byte[]
{
0x77, 0x07, 0x6d, 0x0a, 0x73, 0x18, 0xa5, 0x7d, 0x3c, 0x16, 0xc1,
0x72, 0x51, 0xb2, 0x66, 0x45, 0xdf, 0x4c, 0x2f, 0x87, 0xeb, 0xc0,
0x99, 0x2a, 0xb1, 0x77, 0xfb, 0xa5, 0x1d, 0xb9, 0x2c, 0x2a
};
byte[] bobsk = new byte[]
{
0x5d, 0xab, 0x08, 0x7e, 0x62, 0x4a, 0x8a, 0x4b, 0x79, 0xe1, 0x7f,
0x8b, 0x83, 0x80, 0x0e, 0xe6, 0x6f, 0x3b, 0xb1, 0x29, 0x26, 0x18,
0xb6, 0xfd, 0x1c, 0x2f, 0x8b, 0x27, 0xff, 0x88, 0xe0, 0xeb
};
var alicepk = new byte[32];
var bobpk = new byte[32];
Curve25519.ScalarMultiplicationBase(alicepk, alicesk);
Assert.AreEqual(
FromHex("8520f0098930a754748b7ddcb43ef75a0dbf3a0d26381af4eba4a98eaa9b4e6a"),
alicepk);
Curve25519.ScalarMultiplicationBase(bobpk, bobsk);
Assert.AreEqual(
FromHex("de9edb7d7b7dc1b4d35b61c2ece435373f8343c85b78674dadfc7e146f882b4f"),
bobpk);
var key1 = new byte[32];
Curve25519.ScalarMultiplication(key1, alicesk, bobpk);
var key2 = new byte[32];
Curve25519.ScalarMultiplication(key2, bobsk, alicepk);
Assert.AreEqual(key1, key2);
Assert.AreEqual(
FromHex("4a5d9d5ba4ce2de1728e3bf480350f25e07e21c947d19e3376f09b3c1e161742"),
key1
);
}
public void Test_10_X25519_TestVector_1()
{
byte[] NBin = Hashes.StringToBinary("a546e36bf0527c9d3b16154b82465edd62144c0ac1fc5a18506a2244ba449ac4");
NBin[0] &= 248;
NBin[31] &= 127;
NBin[31] |= 64;
BigInteger N0 = new BigInteger(NBin);
BigInteger N = BigInteger.Parse("31029842492115040904895560451863089656472772604678260265531221036453811406496");
Assert.AreEqual(N, N0);
byte[] UBin = Hashes.StringToBinary("e6db6867583030db3594c1a424b15f7c726624ec26b3353b10a903a6d0ab1c4c");
BigInteger U0 = new BigInteger(UBin);
BigInteger U = BigInteger.Parse("34426434033919594451155107781188821651316167215306631574996226621102155684838");
Assert.AreEqual(U, U0);
byte[] NUBin = Hashes.StringToBinary("c3da55379de9c6908e94ea4df28d084f32eccf03491c71f754b4075577a28552");
BigInteger NU0 = new BigInteger(NUBin);
MontgomeryCurve C = new Curve25519();
BigInteger NU = C.ScalarMultiplication(N, U);
Assert.AreEqual(NU0, NU);
}