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MDC2_Init(3)                        OpenSSL                       MDC2_Init(3)



NAME
       MDC2, MDC2_Init, MDC2_Update, MDC2_Final - MDC2 hash function

LIBRARY
       libcrypto, -lcrypto

SYNOPSIS
        #include <openssl/mdc2.h>

       The following functions have been deprecated since OpenSSL 3.0, and can
       be hidden entirely by defining OPENSSL_API_COMPAT with a suitable
       version value, see openssl_user_macros(7):

        unsigned char *MDC2(const unsigned char *d, unsigned long n,
                            unsigned char *md);

        int MDC2_Init(MDC2_CTX *c);
        int MDC2_Update(MDC2_CTX *c, const unsigned char *data,
                        unsigned long len);
        int MDC2_Final(unsigned char *md, MDC2_CTX *c);

DESCRIPTION
       All of the functions described on this page are deprecated.
       Applications should instead use EVP_DigestInit_ex(3),
       EVP_DigestUpdate(3) and EVP_DigestFinal_ex(3).

       MDC2 is a method to construct hash functions with 128 bit output from
       block ciphers.  These functions are an implementation of MDC2 with DES.

       MDC2() computes the MDC2 message digest of the n bytes at d and places
       it in md (which must have space for MDC2_DIGEST_LENGTH == 16 bytes of
       output). If md is NULL, the digest is placed in a static array.

       The following functions may be used if the message is not completely
       stored in memory:

       MDC2_Init() initializes a MDC2_CTX structure.

       MDC2_Update() can be called repeatedly with chunks of the message to be
       hashed (len bytes at data).

       MDC2_Final() places the message digest in md, which must have space for
       MDC2_DIGEST_LENGTH == 16 bytes of output, and erases the MDC2_CTX.

       Applications should use the higher level functions EVP_DigestInit(3)
       etc. instead of calling the hash functions directly.

RETURN VALUES
       MDC2() returns a pointer to the hash value.

       MDC2_Init(), MDC2_Update() and MDC2_Final() return 1 for success, 0
       otherwise.

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

SEE ALSO
       EVP_DigestInit(3)

HISTORY
       All of these functions were deprecated in OpenSSL 3.0.

COPYRIGHT
       Copyright 2000-2021 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>.



3.0.12                            2023-05-07                      MDC2_Init(3)