1MDC2_INIT(3ossl)                    OpenSSL                   MDC2_INIT(3ossl)
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NAME

6       MDC2, MDC2_Init, MDC2_Update, MDC2_Final - MDC2 hash function
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SYNOPSIS

9        #include <openssl/mdc2.h>
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11       The following functions have been deprecated since OpenSSL 3.0, and can
12       be hidden entirely by defining OPENSSL_API_COMPAT with a suitable
13       version value, see openssl_user_macros(7):
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15        unsigned char *MDC2(const unsigned char *d, unsigned long n,
16                            unsigned char *md);
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18        int MDC2_Init(MDC2_CTX *c);
19        int MDC2_Update(MDC2_CTX *c, const unsigned char *data,
20                        unsigned long len);
21        int MDC2_Final(unsigned char *md, MDC2_CTX *c);
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DESCRIPTION

24       All of the functions described on this page are deprecated.
25       Applications should instead use EVP_DigestInit_ex(3),
26       EVP_DigestUpdate(3) and EVP_DigestFinal_ex(3).
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28       MDC2 is a method to construct hash functions with 128 bit output from
29       block ciphers.  These functions are an implementation of MDC2 with DES.
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31       MDC2() computes the MDC2 message digest of the n bytes at d and places
32       it in md (which must have space for MDC2_DIGEST_LENGTH == 16 bytes of
33       output). If md is NULL, the digest is placed in a static array.
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35       The following functions may be used if the message is not completely
36       stored in memory:
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38       MDC2_Init() initializes a MDC2_CTX structure.
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40       MDC2_Update() can be called repeatedly with chunks of the message to be
41       hashed (len bytes at data).
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43       MDC2_Final() places the message digest in md, which must have space for
44       MDC2_DIGEST_LENGTH == 16 bytes of output, and erases the MDC2_CTX.
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46       Applications should use the higher level functions EVP_DigestInit(3)
47       etc. instead of calling the hash functions directly.
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RETURN VALUES

50       MDC2() returns a pointer to the hash value.
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52       MDC2_Init(), MDC2_Update() and MDC2_Final() return 1 for success, 0
53       otherwise.
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CONFORMING TO

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

60       EVP_DigestInit(3)
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HISTORY

63       All of these functions were deprecated in OpenSSL 3.0.
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66       Copyright 2000-2021 The OpenSSL Project Authors. All Rights Reserved.
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68       Licensed under the Apache License 2.0 (the "License").  You may not use
69       this file except in compliance with the License.  You can obtain a copy
70       in the file LICENSE in the source distribution or at
71       <https://www.openssl.org/source/license.html>.
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753.1.1                             2023-08-31                  MDC2_INIT(3ossl)
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