EVP_MDC2(3SSL)

📦
version 4.0.3 · 13 versions
, in ubuntu stonking

✨ NAME ✨

EVP_mdc2 — MDC-2, but for EVP 💖 (yes bestie, we're doing hash functions today)

🌸 SYNOPSIS 🌸

#include <openssl/evp.h>

const EVP_MD *EVP_mdc2(void);

🦋 DESCRIPTION 🦋

okay so. MDC-2 — that's Modification Detection Code 2, also known as Meyer-Schilling — is a cryptographic hash function that's built on top of a block cipher. iconic behaviour honestly. 🎀

⚠️ real talk though: this implementation is only available with the legacy provider. Like, it does not come out to play unless you've got that provider loaded. periodt.

💅 EVP_mdc2()

This one is the MDC-2DES algorithm — that's MDC-2 used together with the DES block cipher as the underlying cipher. ✨ The way it works is it takes a given input and produces a 128-bit output from it. slay.

👑 NOTES 👑

bestie, listen. there's a performance thing here and I need you to know about it. 👀

Calling this function a bunch of times has negative performance implications — like, lowkey it's giving expensive. So developers should consider using EVP_MD_fetch(3) with EVP_MD-MDC2(7) instead. 🫶

For the full tea, go read "Performance" in crypto(7). iykyk.

💜 RETURN VALUES 💜

These functions hand you back an EVP_MD structure, and that structure contains the implementation of the message digest. so that's your answer, that's the vibe. 🌈

⭐ CONFORMING TO ⭐

ISO/IEC 10118-2:2000 Hash-Function 2, with DES as the underlying block cipher. no cap, it's standard-compliant. 💯

🌸 SEE ALSO 🌸

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>.

okay that's the whole page, you ate that 🫶 this was written against version 4.0.3, dated 2026-09-29, and it lives in the OpenSSL manual as EVP_MDC2(3SSL). go forth and hash responsibly bestie 💅✨

📦 where this page comes from