1MDC2_INIT(3ossl)                    OpenSSL                   MDC2_INIT(3ossl)
2
3
4

NAME

6       MDC2, MDC2_Init, MDC2_Update, MDC2_Final - MDC2 hash function
7

SYNOPSIS

9        #include <openssl/mdc2.h>
10
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):
14
15        unsigned char *MDC2(const unsigned char *d, unsigned long n,
16                            unsigned char *md);
17
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);
22

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).
27
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.
30
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.
34
35       The following functions may be used if the message is not completely
36       stored in memory:
37
38       MDC2_Init() initializes a MDC2_CTX structure.
39
40       MDC2_Update() can be called repeatedly with chunks of the message to be
41       hashed (len bytes at data).
42
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.
45
46       Applications should use the higher level functions EVP_DigestInit(3)
47       etc. instead of calling the hash functions directly.
48

RETURN VALUES

50       MDC2() returns a pointer to the hash value.
51
52       MDC2_Init(), MDC2_Update() and MDC2_Final() return 1 for success, 0
53       otherwise.
54

CONFORMING TO

56       ISO/IEC 10118-2:2000 Hash-Function 2, with DES as the underlying block
57       cipher.
58

SEE ALSO

60       EVP_DigestInit(3)
61

HISTORY

63       All of these functions were deprecated in OpenSSL 3.0.
64
66       Copyright 2000-2021 The OpenSSL Project Authors. All Rights Reserved.
67
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>.
72
73
74
753.1.1                             2023-08-31                  MDC2_INIT(3ossl)
Impressum