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Added signing with extended key for Ed25519 #264

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Added signing with extended key for Ed25519 #264

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15 changes: 15 additions & 0 deletions crypto/src/math/ec/rfc8032/Ed25519.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -1100,6 +1100,21 @@ public static void SignPrehash(byte[] sk, int skOff, byte[] pk, int pkOff, byte[
ImplSign(sk, skOff, pk, pkOff, ctx, phflag, m, 0, m.Length, sig, sigOff);
}

public static void SignByExtendedKey(byte[] h, byte[] ctx, byte[] m, int mOff, int mLen, byte[] sig, int sigOff)
{
byte phflag = 0x00;

byte[] s = new byte[ScalarBytes];
PruneScalar(h, 0, s);

byte[] pk = new byte[PointBytes];
ScalarMultBaseEncoded(s, pk, 0);

IDigest d = CreateDigest();

ImplSign(d, h, s, pk, 0, ctx, phflag, m, mOff, mLen, sig, sigOff);
}

public static bool Verify(byte[] sig, int sigOff, byte[] pk, int pkOff, byte[] m, int mOff, int mLen)
{
byte[] ctx = null;
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