SHA256_SHORT_BLOCK_LENGTH
if (usedspace <= SHA256_SHORT_BLOCK_LENGTH) {
bzero(&context->buffer[usedspace], SHA256_SHORT_BLOCK_LENGTH - usedspace);
bzero(context->buffer, SHA256_SHORT_BLOCK_LENGTH);
bzero(context->buffer, SHA256_SHORT_BLOCK_LENGTH);
*(sha2_word64*)&context->buffer[SHA256_SHORT_BLOCK_LENGTH] = context->bitcount;