LIBKECCAK_UNHEX(3)

💅 NAME 💅

Okay so bestie, welcome to LIBKECCAK_UNHEX(3), from the Library Functions Manual — yes, the manual name is literally right there, cute. ✨ The main character is libkeccak_unhex, and her whole thing is this: converts a hexadecimal hashsum to binary. No cap. 💖

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🎀 SYNOPSIS 🎀

#include <libkeccak.h>

void libkeccak_unhex(void *restrict output, const char *restrict hashsum);

Link with -lkeccak. 🫶

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🦋 DESCRIPTION 🦋

So libkeccak_unhex() takes the hexadecimal hashsum that's chilling in hashsum, converts it to binary, and drops the binary representation into output. Iconic behavior, honestly. 💅

hashsum has to be terminated by a NUL-character. It can be lowercase, uppercase, or a mix of both — she's flexible like that. 🌈

🚨 output will not be terminated. Important, bestie. Do not expect a cute lil' NUL at the end. 😭

(strlen(hashsum) / 2) bytes will be written to the beginning of Ioutput — yep, the page literally says Ioutput, so that's the output pointer having a tiny typo moment 💀. Because of that, output should have an allocation of at least that number of bytes. Don't skimp on the buffer, fr fr. 🍓

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🌟 RETURN VALUES 🌟

libkeccak_unhex() does return any value. That's what the page says — and the synopsis is all void, so it's giving “no value returned” energy. The original wording is a little quirky, but we're keeping it. 💅

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🔥 ERRORS 🔥

libkeccak_unhex() cannot fail. Periodt. 💅✨

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👑 NOTES 👑

hashsum must have an even number of digits — and that's characters excluding the terminating NUL-character, bestie. Even digits only. No odd-numbered chaos allowed. 🌸

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🫶 SEE ALSO 🫶

• libkeccak_behex_lower(3)
• libkeccak_behex_upper(3)

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Cute little footer sign-off: source/version LIBKECCAK, page LIBKECCAK_UNHEX(3) — and there's no date in the footer, so no invented date, just vibes. 💖🎀🦋