EVP_MD4(3SSL)

📦
version 4.0.3 · 14 versions
, in ubuntu stonking

✨ EVP_MD4 — the OpenSSL manual, but make it cute ✨

okay bestie, so this is EVP_MD4 from the OpenSSL 3SSL manual set, and it's literally the whole lore on EVP_md4 — MD4 For EVP. yes the MD4 from 1990. she's vintage, she's iconic, she's md4-coded 💅

🌸 NAME 🌸

EVP_md4 — MD4 For EVP, periodt.

🎀 SYNOPSIS 🎀

#include <openssl/evp.h>

const EVP_MD *EVP_md4(void);

like, that's the whole entrance. no notes. she just walks in.

💖 DESCRIPTION 💖

okay so MD4 is a cryptographic hash function, standardized in RFC 1320, and she was designed by Ronald Rivest and first published in 1990. true vintage, true legend. but here's the thing bestie — this implementation is only available with the legacy provider. not the default one. the legacy one. so if you're looking for her and she's not there, that's why. iykyk 🙈

🦋 EVP_md4() 🦋

the MD4 algorithm, which produces a 128-bit output from a given input. that's the whole vibe. you give her input, she gives you 128 bits back. slay. ✨

👑 NOTES 👑

developers, listen up, this one's important fr fr — you should be aware of the negative performance implications of calling this function multiple times. like, not me spamming the same call over and over 😭 don't do that. instead, consider using EVP_MD_fetch(3) with EVP_MD-MD4(7). and if you wanna know the whole tea, see "Performance" in crypto(7) for further information. 📚

bestie PSA: calling EVP_md4() repeatedly is highkey a performance L. fetch instead. this is not a drill. 💀

⭐ RETURN VALUES ⭐

these functions return an EVP_MD structure that contains the implementation of the message digest. that's your little gift back. 🎁

🌈 CONFORMING TO 🌈

IETF RFC 1320. she's certified, she's official, she conforms. 👑

🫶 SEE ALSO 🫶

go read them, bestie. they're all in the group chat together. 💜

Copyright 2017-2023 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, no cap. this was OpenSSL 4.0.3, dated 2026-09-29, from the EVP_MD4(3SSL) era of the manual. mwah, bye bestie 💖🧚🌸

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