public const int PasswordHashLength = 3 + MD5HashHexSize; // s_md5DeclarationBytes + MD5HashHexSize
public static void ComputePassword(string user, string password, ReadOnlySpan <byte> salt, Span <byte> result)
{
var passwordBytesCount = PgUtf8.GetByteCount(password);
var userBytesCount = PgUtf8.GetByteCount(user);
var tempSize = passwordBytesCount + userBytesCount + MD5HashSize + MD5HashHexSize + salt.Length;
Span <byte> temp = stackalloc byte[tempSize];
var buffer = temp.Slice(0, passwordBytesCount + userBytesCount);
var writeCount = PgUtf8.ToUtf8(password, buffer);
_ = PgUtf8.ToUtf8(user, buffer.Slice(writeCount));
var hash = temp.Slice(buffer.Length, MD5HashSize);
MD5.Instance.TryComputeHash(buffer, hash);
var hexHash = temp.Slice(buffer.Length + hash.Length);
HashToString(hash, hexHash.Slice(0, MD5HashHexSize));
salt.CopyTo(hexHash.Slice(MD5HashHexSize));
MD5.Instance.TryComputeHash(hexHash, hash);
hexHash = hexHash.Slice(0, MD5HashHexSize);
HashToString(hash, hexHash);
s_md5DeclarationBytes.CopyTo(result);
hexHash.CopyTo(result.Slice(3));
}
public void WriteNullTerminateUtf8String(ReadOnlySpan <char> s)
{
var slice = m_span.Slice(m_position);
var count = PgUtf8.ToUtf8(s, slice);
slice[count] = 0;
m_position += count + 1;
}