projects / thirdparty / openssl.git / blame
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|---|---|---|
| 9dbc41d7 UM |
1 | =pod |
| 2 | ||
| 3 | =head1 NAME | |
| 4 | ||
| 5 | MDC2, MDC2_Init, MDC2_Update, MDC2_Final - MDC2 hash function | |
| 6 | ||
| 7 | =head1 SYNOPSIS | |
| 8 | ||
| 9 | #include <openssl/mdc2.h> | |
| 10 | ||
| 11 | unsigned char *MDC2(const unsigned char *d, unsigned long n, | |
| e9b77246 | 12 | unsigned char *md); |
| 9dbc41d7 | 13 | |
| 8a4af56f NL |
14 | int MDC2_Init(MDC2_CTX *c); |
| 15 | int MDC2_Update(MDC2_CTX *c, const unsigned char *data, | |
| e9b77246 | 16 | unsigned long len); |
| 8a4af56f | 17 | int MDC2_Final(unsigned char *md, MDC2_CTX *c); |
| 9dbc41d7 UM |
18 | |
| 19 | =head1 DESCRIPTION | |
| 20 | ||
| 21 | MDC2 is a method to construct hash functions with 128 bit output from | |
| 22 | block ciphers. These functions are an implementation of MDC2 with | |
| 23 | DES. | |
| 24 | ||
| 25 | MDC2() computes the MDC2 message digest of the B<n> | |
| 26 | bytes at B<d> and places it in B<md> (which must have space for | |
| 27 | MDC2_DIGEST_LENGTH == 16 bytes of output). If B<md> is NULL, the digest | |
| 28 | is placed in a static array. | |
| 29 | ||
| 30 | The following functions may be used if the message is not completely | |
| 31 | stored in memory: | |
| 32 | ||
| 33 | MDC2_Init() initializes a B<MDC2_CTX> structure. | |
| 34 | ||
| 35 | MDC2_Update() can be called repeatedly with chunks of the message to | |
| 36 | be hashed (B<len> bytes at B<data>). | |
| 37 | ||
| 38 | MDC2_Final() places the message digest in B<md>, which must have space | |
| 39 | for MDC2_DIGEST_LENGTH == 16 bytes of output, and erases the B<MDC2_CTX>. | |
| 40 | ||
| d52c9734 | 41 | Applications should use the higher level functions |
| 9b86974e | 42 | L<EVP_DigestInit(3)> etc. instead of calling the |
| d52c9734 UM |
43 | hash functions directly. |
| 44 | ||
| 9dbc41d7 UM |
45 | =head1 RETURN VALUES |
| 46 | ||
| 1bc74519 | 47 | MDC2() returns a pointer to the hash value. |
| 9dbc41d7 | 48 | |
| 8a4af56f | 49 | MDC2_Init(), MDC2_Update() and MDC2_Final() return 1 for success, 0 otherwise. |
| 9dbc41d7 UM |
50 | |
| 51 | =head1 CONFORMING TO | |
| 52 | ||
| bbda8ce9 | 53 | ISO/IEC 10118-2:2000 Hash-Function 2, with DES as the underlying block cipher. |
| 9dbc41d7 UM |
54 | |
| 55 | =head1 SEE ALSO | |
| 56 | ||
| 9b86974e | 57 | L<EVP_DigestInit(3)> |
| 9dbc41d7 | 58 | |
| e2f92610 RS |
59 | =head1 COPYRIGHT |
| 60 | ||
| bbda8ce9 | 61 | Copyright 2000-2017 The OpenSSL Project Authors. All Rights Reserved. |
| e2f92610 RS |
62 | |
| 63 | Licensed under the OpenSSL license (the "License"). You may not use | |
| 64 | this file except in compliance with the License. You can obtain a copy | |
| 65 | in the file LICENSE in the source distribution or at | |
| 66 | L<https://www.openssl.org/source/license.html>. | |
| 67 | ||
| 68 | =cut |