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"); } FieldElement montgomeryX, edwardsY, edwardsZ, sharedMontgomeryX; FieldOperations.fe_frombytes(out edwardsY, publicKey.Array, publicKey.Offset); FieldOperations.fe_1(out edwardsZ); MontgomeryCurve25519.EdwardsToMontgomeryX(out montgomeryX, ref edwardsY, ref edwardsZ); var blake2bConfig = new Blake2BConfig { OutputSizeInBytes = 64 }; var hasher = Blake2B.Create(blake2bConfig); hasher.Update(privateKey.Array, privateKey.Offset, 32); byte[] h = hasher.Finish(); //byte[] h = Sha512.Hash(privateKey.Array, privateKey.Offset, 32);//ToDo: Remove alloc ScalarOperations.sc_clamp(h, 0); MontgomeryOperations.scalarmult(out sharedMontgomeryX, h, 0, ref montgomeryX); CryptoBytes.Wipe(h); FieldOperations.fe_tobytes(sharedKey.Array, sharedKey.Offset, ref sharedMontgomeryX); MontgomeryCurve25519.KeyExchangeOutputHashNaCl(sharedKey.Array, sharedKey.Offset); }
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"); } FieldElement montgomeryX, edwardsY, edwardsZ, sharedMontgomeryX; FieldOperations.fe_frombytes(out edwardsY, publicKey.Array, publicKey.Offset); FieldOperations.fe_1(out edwardsZ); MontgomeryCurve25519.EdwardsToMontgomeryX(out montgomeryX, ref edwardsY, ref edwardsZ); var hasher = Blake2Fast.Blake2b.CreateIncrementalHasher(64); hasher.Update(new ArraySegment <byte>(privateKey.Array, privateKey.Offset, 32)); byte[] h = hasher.Finish(); ScalarOperations.sc_clamp(h, 0); MontgomeryOperations.scalarmult(out sharedMontgomeryX, h, 0, ref montgomeryX); CryptoBytes.Wipe(h); FieldOperations.fe_tobytes(sharedKey.Array, sharedKey.Offset, ref sharedMontgomeryX); MontgomeryCurve25519.KeyExchangeOutputHashNaCl(sharedKey.Array, sharedKey.Offset); }
public static void KeyExchange(ArraySegment \ \ sharedKey, ArraySegment \ \ publicKey, ArraySegment \ \ 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"); } FieldElement montgomeryX, edwardsY, edwardsZ, sharedMontgomeryX; FieldOperations.fe_frombytes(out edwardsY, publicKey.Array, publicKey.Offset); FieldOperations.fe_1(out edwardsZ); MontgomeryCurve25519.EdwardsToMontgomeryX(out 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 sharedMontgomeryX, h, 0, ref montgomeryX); CryptoBytes.Wipe(h); FieldOperations.fe_tobytes(sharedKey.Array, sharedKey.Offset, ref sharedMontgomeryX); MontgomeryCurve25519.KeyExchangeOutputHashNaCl(sharedKey.Array, sharedKey.Offset); }