internal static byte[] ComputeSignatureDigest(System.IO.Stream chunksStream
, long chunksOffset
, long chunksLength
, ECF.EcfHeader header)
{
Contract.Requires(chunksStream != null);
Contract.Requires(chunksStream.CanSeek && chunksStream.CanRead);
Contract.Requires(chunksOffset >= 0);
Contract.Requires(chunksLength > 0);
using (var sha = new SHA1CryptoServiceProvider())
{
PhxHash.UInt32(sha, kSha1Salt);
PhxHash.UInt32(sha, (uint)header.HeaderSize);
PhxHash.UInt32(sha, (uint)header.ChunkCount);
PhxHash.UInt32(sha, (uint)header.ExtraDataSize);
PhxHash.UInt32(sha, (uint)header.TotalSize);
PhxHash.Stream(sha,
chunksStream, chunksOffset, chunksLength,
isFinal: true);
return(sha.Hash);
}
}
public void UpdateHash(SHA1CryptoServiceProvider sha)
{
PhxHash.UInt8(sha, kVersion);
PhxHash.UInt64(sha, Id);
PhxHash.Unicode(sha, Name, kNameStorage.FixedLength - 1);
PhxHash.Unicode(sha, Description, kDescStorage.FixedLength - 1);
PhxHash.Ascii(sha, Author, kAuthorStorage.FixedLength);
DateTime.UpdateHash(sha);
PhxHash.UInt64(sha, AuthorXuid);
PhxHash.UInt32(sha, Bitwise.ByteSwap.SingleToUInt32(Length));
PhxHash.UInt16(sha, (uint)SessionId);
PhxHash.UInt32(sha, (uint)GameType);
PhxHash.UInt64(sha, DataCryptKey);
sha.TransformBlock(DataHash, 0, DataHash.Length, null, 0);
PhxHash.UInt64(sha, DataSize, isFinal: true);
}