SHA512_SHORT_BLOCK_LENGTH
if (usedspace <= SHA512_SHORT_BLOCK_LENGTH) {
memset(&context->buffer[usedspace], 0, SHA512_SHORT_BLOCK_LENGTH - usedspace);
memset(context->buffer, 0, SHA512_SHORT_BLOCK_LENGTH);
BE_64_TO_8(&context->buffer[SHA512_SHORT_BLOCK_LENGTH],
BE_64_TO_8(&context->buffer[SHA512_SHORT_BLOCK_LENGTH + 8],