---
name: "EVP_mdc2"
section: "3ssl"
platform: "linux"
package: "openssl"
version: "3.6.5-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/EVP_mdc2"
---

# EVP\_mdc2(3ssl)

MDC-2 For EVP

## NAME

EVP\_mdc2 - MDC-2 For EVP

## SYNOPSIS

```
 #include <openssl/evp.h>
 const EVP_MD *EVP_mdc2(void);
```

## DESCRIPTION

MDC-2 (Modification Detection Code 2 or Meyer-Schilling) is a cryptographic hash function based on a block cipher. This implementation is only available with the legacy provider.

- **EVP\_mdc2()**

  The MDC-2DES algorithm of using MDC-2 with the DES block cipher. It produces a 128-bit output from a given input.

## NOTES

Developers should be aware of the negative performance implications of calling this function multiple times and should consider using **EVP\_MD\_fetch**(3) with **EVP\_MD-MDC2**(7) instead. See "Performance" in [**crypto**(7)](/crypto/7.md) for further information.

## RETURN VALUES

These functions return a **EVP\_MD** structure that contains the implementation of the message digest. See **EVP\_MD\_meth\_new**(3) for details of the **EVP\_MD** structure.

## CONFORMING TO

ISO/IEC 10118-2:2000 Hash-Function 2, with DES as the underlying block cipher.

## SEE ALSO

**evp**(7), **provider**(7), **EVP\_DigestInit**(3)

## COPYRIGHT

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\>.