Function sha1_done

Libraries/unrar/sha1.cpp:172–202

Add padding and return the message digest. */

/* Add padding and return the message digest. */
void sha1_done( sha1_context* context, uint32 digest[5])
{
  uint32 workspace[16];
  uint64 BitLength = context->count * 8;
  uint BufPos = (uint)context->count & 0x3f;
  context->buffer[BufPos++] = 0x80; // Padding the message with "1" bit.

  if (BufPos!=56) // We need 56 bytes block followed by 8 byte length.
  {
    if (BufPos>56)
    {
      while (BufPos<64)
        context->buffer[BufPos++] = 0;
      BufPos=0;
    }
    if (BufPos==0)
      SHA1Transform(context->state, workspace, context->buffer, true);
    memset(context->buffer+BufPos,0,56-BufPos);
  }

  RawPutBE4((uint32)(BitLength>>32), context->buffer + 56);
  RawPutBE4((uint32)(BitLength), context->buffer + 60);

  SHA1Transform(context->state, workspace, context->buffer, true);

  for (uint i = 0; i < 5; i++)
    digest[i] = context->state[i];

  /* Wipe variables */
  sha1_init(context);
}