public static byte[] Hash(byte[] data, int offset, int count) { var hasher = new Sha512(); hasher.Update(data, offset, count); return(hasher.Finish()); }
//[Obsolete("Needs more testing")] public static void KeyExchange(ArraySegment <byte> sharedKey, ArraySegment <byte> publicKey, ArraySegment <byte> privateKey) { if (sharedKey.Array == null) { throw new ArgumentNullException("sharedKey.Array"); } if (publicKey.Array == null) { throw new ArgumentNullException("publicKey.Array"); } 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 FieldElement edwardsY, publicKey.Array, publicKey.Offset); FieldOperations.fe_1(out FieldElement edwardsZ); MontgomeryCurve25519.EdwardsToMontgomeryX(out FieldElement montgomeryX, ref edwardsY, ref edwardsZ); byte[] h = Sha512.Hash(privateKey.Array, privateKey.Offset, 32);//ToDo: Remove alloc ScalarOperations.sc_clamp(h, 0); MontgomeryOperations.scalarmult(out FieldElement sharedMontgomeryX, h, 0, ref montgomeryX); CryptoBytes.Wipe(h); FieldOperations.fe_tobytes(sharedKey.Array, sharedKey.Offset, ref sharedMontgomeryX); MontgomeryCurve25519.KeyExchangeOutputHashNaCl(sharedKey.Array, sharedKey.Offset); }