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9dbc41d7 UM |
1 | =pod |
2 | ||
3 | =head1 NAME | |
4 | ||
3009458e RL |
5 | MD2, MD4, MD5, MD2_Init, MD2_Update, MD2_Final, MD4_Init, MD4_Update, |
6 | MD4_Final, MD5_Init, MD5_Update, MD5_Final - MD2, MD4, and MD5 hash functions | |
9dbc41d7 UM |
7 | |
8 | =head1 SYNOPSIS | |
9 | ||
10 | #include <openssl/md2.h> | |
11 | ||
12 | unsigned char *MD2(const unsigned char *d, unsigned long n, | |
13 | unsigned char *md); | |
14 | ||
8a4af56f NL |
15 | int MD2_Init(MD2_CTX *c); |
16 | int MD2_Update(MD2_CTX *c, const unsigned char *data, | |
9dbc41d7 | 17 | unsigned long len); |
8a4af56f | 18 | int MD2_Final(unsigned char *md, MD2_CTX *c); |
9dbc41d7 UM |
19 | |
20 | ||
3009458e RL |
21 | #include <openssl/md4.h> |
22 | ||
23 | unsigned char *MD4(const unsigned char *d, unsigned long n, | |
24 | unsigned char *md); | |
25 | ||
8a4af56f NL |
26 | int MD4_Init(MD4_CTX *c); |
27 | int MD4_Update(MD4_CTX *c, const void *data, | |
3009458e | 28 | unsigned long len); |
8a4af56f | 29 | int MD4_Final(unsigned char *md, MD4_CTX *c); |
3009458e RL |
30 | |
31 | ||
9dbc41d7 UM |
32 | #include <openssl/md5.h> |
33 | ||
34 | unsigned char *MD5(const unsigned char *d, unsigned long n, | |
35 | unsigned char *md); | |
36 | ||
8a4af56f NL |
37 | int MD5_Init(MD5_CTX *c); |
38 | int MD5_Update(MD5_CTX *c, const void *data, | |
9dbc41d7 | 39 | unsigned long len); |
8a4af56f | 40 | int MD5_Final(unsigned char *md, MD5_CTX *c); |
9dbc41d7 UM |
41 | |
42 | =head1 DESCRIPTION | |
43 | ||
3009458e | 44 | MD2, MD4, and MD5 are cryptographic hash functions with a 128 bit output. |
9dbc41d7 | 45 | |
3009458e RL |
46 | MD2(), MD4(), and MD5() compute the MD2, MD4, and MD5 message digest |
47 | of the B<n> bytes at B<d> and place it in B<md> (which must have space | |
48 | for MD2_DIGEST_LENGTH == MD4_DIGEST_LENGTH == MD5_DIGEST_LENGTH == 16 | |
49 | bytes of output). If B<md> is NULL, the digest is placed in a static | |
50 | array. | |
9dbc41d7 UM |
51 | |
52 | The following functions may be used if the message is not completely | |
53 | stored in memory: | |
54 | ||
55 | MD2_Init() initializes a B<MD2_CTX> structure. | |
56 | ||
57 | MD2_Update() can be called repeatedly with chunks of the message to | |
58 | be hashed (B<len> bytes at B<data>). | |
59 | ||
60 | MD2_Final() places the message digest in B<md>, which must have space | |
61 | for MD2_DIGEST_LENGTH == 16 bytes of output, and erases the B<MD2_CTX>. | |
62 | ||
3009458e RL |
63 | MD4_Init(), MD4_Update(), MD4_Final(), MD5_Init(), MD5_Update(), and |
64 | MD5_Final() are analogous using an B<MD4_CTX> and B<MD5_CTX> structure. | |
9dbc41d7 | 65 | |
d52c9734 | 66 | Applications should use the higher level functions |
9b86974e | 67 | L<EVP_DigestInit(3)> |
4d524e10 | 68 | etc. instead of calling the hash functions directly. |
4facdbb5 | 69 | |
9dbc41d7 UM |
70 | =head1 NOTE |
71 | ||
3009458e | 72 | MD2, MD4, and MD5 are recommended only for compatibility with existing |
9dbc41d7 UM |
73 | applications. In new applications, SHA-1 or RIPEMD-160 should be |
74 | preferred. | |
75 | ||
76 | =head1 RETURN VALUES | |
77 | ||
1bc74519 | 78 | MD2(), MD4(), and MD5() return pointers to the hash value. |
9dbc41d7 | 79 | |
3009458e | 80 | MD2_Init(), MD2_Update(), MD2_Final(), MD4_Init(), MD4_Update(), |
8a4af56f NL |
81 | MD4_Final(), MD5_Init(), MD5_Update(), and MD5_Final() return 1 for |
82 | success, 0 otherwise. | |
9dbc41d7 UM |
83 | |
84 | =head1 CONFORMING TO | |
85 | ||
3009458e | 86 | RFC 1319, RFC 1320, RFC 1321 |
9dbc41d7 UM |
87 | |
88 | =head1 SEE ALSO | |
89 | ||
9b86974e | 90 | L<EVP_DigestInit(3)> |
3009458e | 91 | |
e2f92610 RS |
92 | =head1 COPYRIGHT |
93 | ||
94 | Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved. | |
95 | ||
96 | Licensed under the OpenSSL license (the "License"). You may not use | |
97 | this file except in compliance with the License. You can obtain a copy | |
98 | in the file LICENSE in the source distribution or at | |
99 | L<https://www.openssl.org/source/license.html>. | |
100 | ||
101 | =cut |