public static void CryptoSignKeypair(byte[] pk, int pkoffset, byte[] sk, int skoffset, byte[] seed,
int seedoffset)
{
int i;
Array.Copy(seed, seedoffset, sk, skoffset, 32);
var h = Sha512.Hash(sk, skoffset, 32); //ToDo: Remove alloc
ScalarOperations.ScClamp(h, 0);
stellar_dotnet_sdk.chaos.nacl.Internal.Ed25519Ref10.GroupOperations.GeScalarmultBase(out var a, h, 0);
stellar_dotnet_sdk.chaos.nacl.Internal.Ed25519Ref10.GroupOperations.ge_p3_tobytes(pk, pkoffset, ref a);
for (i = 0; i < 32; ++i)
{
sk[skoffset + 32 + i] = pk[pkoffset + i];
}
CryptoBytes.Wipe(h);
}
public static void KeyExchange(ArraySegment <byte> sharedKey, ArraySegment <byte> publicKey,
ArraySegment <byte> privateKey)
{
if (sharedKey.Array == null)
{
throw new ArgumentNullException(nameof(sharedKey));
}
if (publicKey.Array == null)
{
throw new ArgumentNullException(nameof(sharedKey));
}
if (privateKey.Array == null)
{
throw new ArgumentNullException("privateKey");
}
if (sharedKey.Count != 32)
{
throw new ArgumentException("sharedKey.Count != 32");
}
if (publicKey.Count != 32)
{
throw new ArgumentException("publicKey.Count != 32");
}
if (privateKey.Count != 64)
{
throw new ArgumentException("privateKey.Count != 64");
}
FieldOperations.fe_frombytes(out var edwardsY, publicKey.Array, publicKey.Offset);
FieldOperations.fe_1(out var edwardsZ);
MontgomeryCurve25519.EdwardsToMontgomeryX(out var montgomeryX, ref edwardsY, ref edwardsZ);
var h = Sha512.Hash(privateKey.Array, privateKey.Offset, 32);
ScalarOperations.ScClamp(h, 0);
MontgomeryOperations.ScalarMult(out var sharedMontgomeryX, h, 0, ref montgomeryX);
CryptoBytes.Wipe(h);
FieldOperations.fe_tobytes(sharedKey.Array, sharedKey.Offset, ref sharedMontgomeryX);
MontgomeryCurve25519.KeyExchangeOutputHashNaCl(sharedKey.Array, sharedKey.Offset);
}