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); byte[] h = Sha512.Hash(sk, skoffset, 32); //ToDo: Remove alloc ScalarOperations.ScClamp(h, 0); GroupOperations.GeScalarmultBase(out GroupElementP3 a, h, 0); 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 crypto_sign( * byte[] sm, out int smlen, * byte[] m, int mlen, * byte[] sk * ) * { * byte[] az = new byte[64]; * byte[] r = new byte[64]; * byte[] hram = new byte[64]; * GroupElementP3 R; * int i; * * Helpers.crypto_hash_sha512(az, sk, 0, 32); * az[0] &= 248; * az[31] &= 63; * az[31] |= 64; * * smlen = mlen + 64; * for (i = 0; i < mlen; ++i) sm[64 + i] = m[i]; * for (i = 0; i < 32; ++i) sm[32 + i] = az[32 + i]; * Helpers.crypto_hash_sha512(r, sm, 32, mlen + 32); * for (i = 0; i < 32; ++i) sm[32 + i] = sk[32 + i]; * * ScalarOperations.sc_reduce(r); * GroupOperations.ge_scalarmult_base(out R, r, 0); * GroupOperations.ge_p3_tobytes(sm, 0, ref R); * * Helpers.crypto_hash_sha512(hram, sm, 0, mlen + 64); * ScalarOperations.sc_reduce(hram); * var sm32 = new byte[32]; * Array.Copy(sm, 32, sm32, 0, 32); * ScalarOperations.sc_muladd(sm32, hram, az, r); * Array.Copy(sm32, 0, sm, 32, 32); * }*/ public static void crypto_sign2( byte[] sig, int sigoffset, byte[] m, int moffset, int mlen, byte[] sk, int skoffset) { Sha512 hasher = new Sha512(); { hasher.Update(sk, skoffset, 32); byte[] az = hasher.Finish(); ScalarOperations.ScClamp(az, 0); hasher.Init(); hasher.Update(az, 32, 32); hasher.Update(m, moffset, mlen); byte[] r = hasher.Finish(); ScalarOperations.ScReduce(r); GroupElementP3 R; GroupOperations.GeScalarmultBase(out R, r, 0); GroupOperations.ge_p3_tobytes(sig, sigoffset, ref R); hasher.Init(); hasher.Update(sig, sigoffset, 32); hasher.Update(sk, skoffset + 32, 32); hasher.Update(m, moffset, mlen); byte[] hram = hasher.Finish(); ScalarOperations.ScReduce(hram); byte[] s = new byte[32]; Array.Copy(sig, sigoffset + 32, s, 0, 32); ScalarOperations.ScMulAdd(s, hram, az, r); Array.Copy(s, 0, sig, sigoffset + 32, 32); CryptoBytes.Wipe(s); } }