/// <summary>
/// Returns xor of metadata source hashes. If there are no source hashes, returns the
/// hash of the json abi string.
/// </summary>
/// <param name="contract"></param>
/// <returns></returns>
byte[] GetSourceHashesXor(SolcNet.DataDescription.Output.Contract contract)
{
if (string.IsNullOrEmpty(contract.Metadata))
{
return(KeccakHashString(_assemblyVersion + "\n" + contract.AbiJsonString));
}
var hashes = JObject.Parse(contract.Metadata)
.SelectTokens("sources.*.keccak256")
.Values <string>()
.ToArray();
Span <byte> hashBuff = new byte[32];
Span <ulong> hashBuffLong = MemoryMarshal.Cast <byte, ulong>(hashBuff);
byte[] resultBuffer = new byte[32];
KeccakHashString(_assemblyVersion, resultBuffer);
Span <ulong> resultBufferLong = MemoryMarshal.Cast <byte, ulong>(resultBuffer);
for (var i = 0; i < hashes.Length; i++)
{
var hash = hashes[i].AsSpan(2, 64);
HexUtil.HexToSpan(hash, hashBuff);
for (var j = 0; j < resultBufferLong.Length; j++)
{
resultBufferLong[j] ^= hashBuffLong[j];
}
}
return(resultBuffer);
}