| | | 1 | | using NBitcoin; |
| | | 2 | | |
| | | 3 | | namespace NLightning.Infrastructure.Bitcoin.Crypto.Functions; |
| | | 4 | | |
| | | 5 | | using Domain.Crypto.Constants; |
| | | 6 | | using Domain.Crypto.ValueObjects; |
| | | 7 | | using Infrastructure.Crypto.Hashes; |
| | | 8 | | using Infrastructure.Crypto.Interfaces; |
| | | 9 | | |
| | | 10 | | /// <summary> |
| | | 11 | | /// The SecP256k1 DH function implementation. |
| | | 12 | | /// </summary> |
| | | 13 | | /// <see href="https://github.com/lightning/bolts/blob/master/08-transport.md#handshake-state"/> |
| | | 14 | | internal sealed class Ecdh : IEcdh |
| | | 15 | | { |
| | | 16 | | /// <inheritdoc/> |
| | | 17 | | /// <param name="k">Private Key</param> |
| | | 18 | | /// <param name="rk">Remote Static PubKey</param> |
| | | 19 | | /// <param name="sharedKey"></param> |
| | | 20 | | public void SecP256K1Dh(PrivKey k, ReadOnlySpan<byte> rk, Span<byte> sharedKey) |
| | | 21 | | { |
| | 200 | 22 | | PubKey pubKey = new(rk); |
| | 188 | 23 | | using Key key = new(k); |
| | | 24 | | |
| | | 25 | | // ECDH operation |
| | 188 | 26 | | var sharedPubKey = pubKey.GetSharedPubkey(key); |
| | | 27 | | |
| | | 28 | | // Shared public key's Compressed format's SHA256 |
| | 188 | 29 | | using var sha256 = new Sha256(); |
| | 188 | 30 | | sha256.AppendData(sharedPubKey.Compress().ToBytes()); |
| | 188 | 31 | | sha256.GetHashAndReset(sharedKey); |
| | 376 | 32 | | } |
| | | 33 | | |
| | | 34 | | /// <inheritdoc/> |
| | | 35 | | public CryptoKeyPair GenerateKeyPair() |
| | | 36 | | { |
| | 0 | 37 | | using var key = new Key(); |
| | 0 | 38 | | return new CryptoKeyPair(key.ToBytes(), key.PubKey.ToBytes()); |
| | 0 | 39 | | } |
| | | 40 | | |
| | | 41 | | /// <inheritdoc/> |
| | | 42 | | public CryptoKeyPair GenerateKeyPair(ReadOnlySpan<byte> privateKey) |
| | | 43 | | { |
| | 188 | 44 | | if (privateKey.Length != CryptoConstants.PrivkeyLen) |
| | | 45 | | { |
| | 4 | 46 | | throw new ArgumentException("Invalid private key length"); |
| | | 47 | | } |
| | | 48 | | |
| | 184 | 49 | | using var key = new Key(privateKey.ToArray()); |
| | 184 | 50 | | return new CryptoKeyPair(key.ToBytes(), key.PubKey.ToBytes()); |
| | 184 | 51 | | } |
| | | 52 | | } |