BN_ADD_WORD(3SSL)

📦
version 4.0.3 · 14 versions
, in ubuntu stonking

💖 BN_ADD_WORD 💖

okay so bestie, this is the BN_ADD_WORD(3SSL)</p> page from the OpenSSL manual, and it's literally the glow-up of BIGNUM math. instead of doing whole big-number arithmetic like a peasant, you just do math with plain old integers. so efficient. so slay. ✨

🌸 NAME 🌸

BN_add_word, BN_sub_word, BN_mul_word, BN_div_word, BN_mod_word — arithmetic functions on BIGNUMs with integers 🧮💅

✨ SYNOPSIS ✨

#include <openssl/bn.h>

int BN_add_word(BIGNUM *a, BN_ULONG w);

int BN_sub_word(BIGNUM *a, BN_ULONG w);

int BN_mul_word(BIGNUM *a, BN_ULONG w);

BN_ULONG BN_div_word(BIGNUM *a, BN_ULONG w);

BN_ULONG BN_mod_word(const BIGNUM *a, BN_ULONG w);

🦋 DESCRIPTION 🦋

so these functions do arithmetic on BIGNUMs with unsigned integers. and the way that they're so much more efficient than the normal BIGNUM arithmetic operations?? iconic. no cap. 💅

  • BN_add_word() — adds w to a ("a+=w") ➕
  • BN_sub_word() — subtracts w from a ("a-=w") ➖
  • BN_mul_word() — multiplies a and w ("a*=w") ✖️
  • BN_div_word() — divides a by w ("a/=w") and returns the remainder ➗
  • BN_mod_word() — returns the remainder of a divided by w ("a%w") 🌀
💀 GIRL. LISTEN. For BN_div_word() and BN_mod_word(), w must not be 0. zero. not a vibe. do not.

👑 RETURN VALUES 👑

  • BN_add_word(), BN_sub_word() and BN_mul_word() return 1 for success, 0 on error. and if you're like "okay but which error 🥺", you can go get the error codes with ERR_get_error(3). periodt.
  • BN_mod_word() and BN_div_word() return a%w on success and (BN_ULONG)-1 if an error occurred. yeah bestie, that's the screaming number 😭

🌈 SEE ALSO 🌈

Copyright 2000-2017 The OpenSSL Project Authors. All Rights Reserved. 🫶

Licensed under the Apache License 2.0 (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at <https://www.openssl.org/source/license.html>. 📜

and that's the whole page bestie, no crumbs left 💖 this was OpenSSL version 4.0.3, dated 2026-09-29, filed under BN_ADD_WORD(3SSL). go forth and do tiny integer math on your giant numbers, you absolute main character. mwah 🧚✨

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