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diff --git a/src/lib/libcrypto/doc/HMAC.pod b/src/lib/libcrypto/doc/HMAC.pod deleted file mode 100644 index d92138d273..0000000000 --- a/src/lib/libcrypto/doc/HMAC.pod +++ /dev/null | |||
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1 | =pod | ||
2 | |||
3 | =head1 NAME | ||
4 | |||
5 | HMAC, HMAC_Init, HMAC_Update, HMAC_Final, HMAC_cleanup - HMAC message | ||
6 | authentication code | ||
7 | |||
8 | =head1 SYNOPSIS | ||
9 | |||
10 | #include <openssl/hmac.h> | ||
11 | |||
12 | unsigned char *HMAC(const EVP_MD *evp_md, const void *key, | ||
13 | int key_len, const unsigned char *d, int n, | ||
14 | unsigned char *md, unsigned int *md_len); | ||
15 | |||
16 | void HMAC_CTX_init(HMAC_CTX *ctx); | ||
17 | |||
18 | int HMAC_Init(HMAC_CTX *ctx, const void *key, int key_len, | ||
19 | const EVP_MD *md); | ||
20 | int HMAC_Init_ex(HMAC_CTX *ctx, const void *key, int key_len, | ||
21 | const EVP_MD *md, ENGINE *impl); | ||
22 | int HMAC_Update(HMAC_CTX *ctx, const unsigned char *data, int len); | ||
23 | int HMAC_Final(HMAC_CTX *ctx, unsigned char *md, unsigned int *len); | ||
24 | |||
25 | void HMAC_CTX_cleanup(HMAC_CTX *ctx); | ||
26 | void HMAC_cleanup(HMAC_CTX *ctx); | ||
27 | |||
28 | =head1 DESCRIPTION | ||
29 | |||
30 | HMAC is a MAC (message authentication code), i.e. a keyed hash | ||
31 | function used for message authentication, which is based on a hash | ||
32 | function. | ||
33 | |||
34 | HMAC() computes the message authentication code of the B<n> bytes at | ||
35 | B<d> using the hash function B<evp_md> and the key B<key> which is | ||
36 | B<key_len> bytes long. | ||
37 | |||
38 | It places the result in B<md> (which must have space for the output of | ||
39 | the hash function, which is no more than B<EVP_MAX_MD_SIZE> bytes). | ||
40 | If B<md> is NULL, the digest is placed in a static array. The size of | ||
41 | the output is placed in B<md_len>, unless it is B<NULL>. | ||
42 | |||
43 | B<evp_md> can be EVP_sha1(), EVP_ripemd160() etc. | ||
44 | |||
45 | HMAC_CTX_init() initialises a B<HMAC_CTX> before first use. It must be | ||
46 | called. | ||
47 | |||
48 | HMAC_CTX_cleanup() erases the key and other data from the B<HMAC_CTX> | ||
49 | and releases any associated resources. It must be called when an | ||
50 | B<HMAC_CTX> is no longer required. | ||
51 | |||
52 | HMAC_cleanup() is an alias for HMAC_CTX_cleanup() included for back | ||
53 | compatibility with 0.9.6b, it is deprecated. | ||
54 | |||
55 | The following functions may be used if the message is not completely | ||
56 | stored in memory: | ||
57 | |||
58 | HMAC_Init() initializes a B<HMAC_CTX> structure to use the hash | ||
59 | function B<evp_md> and the key B<key> which is B<key_len> bytes | ||
60 | long. It is deprecated and only included for backward compatibility | ||
61 | with OpenSSL 0.9.6b. | ||
62 | |||
63 | HMAC_Init_ex() initializes or reuses a B<HMAC_CTX> structure to use | ||
64 | the function B<evp_md> and key B<key>. Either can be NULL, in which | ||
65 | case the existing one will be reused. HMAC_CTX_init() must have been | ||
66 | called before the first use of an B<HMAC_CTX> in this | ||
67 | function. B<N.B. HMAC_Init() had this undocumented behaviour in | ||
68 | previous versions of OpenSSL - failure to switch to HMAC_Init_ex() in | ||
69 | programs that expect it will cause them to stop working>. | ||
70 | |||
71 | HMAC_Update() can be called repeatedly with chunks of the message to | ||
72 | be authenticated (B<len> bytes at B<data>). | ||
73 | |||
74 | HMAC_Final() places the message authentication code in B<md>, which | ||
75 | must have space for the hash function output. | ||
76 | |||
77 | =head1 RETURN VALUES | ||
78 | |||
79 | HMAC() returns a pointer to the message authentication code or NULL if | ||
80 | an error occurred. | ||
81 | |||
82 | HMAC_Init_ex(), HMAC_Update() and HMAC_Final() return 1 for success or 0 if | ||
83 | an error occurred. | ||
84 | |||
85 | HMAC_CTX_init() and HMAC_CTX_cleanup() do not return values. | ||
86 | |||
87 | =head1 CONFORMING TO | ||
88 | |||
89 | RFC 2104 | ||
90 | |||
91 | =head1 SEE ALSO | ||
92 | |||
93 | L<sha(3)|sha(3)>, L<evp(3)|evp(3)> | ||
94 | |||
95 | =head1 HISTORY | ||
96 | |||
97 | HMAC(), HMAC_Init(), HMAC_Update(), HMAC_Final() and HMAC_cleanup() | ||
98 | are available since SSLeay 0.9.0. | ||
99 | |||
100 | HMAC_CTX_init(), HMAC_Init_ex() and HMAC_CTX_cleanup() are available | ||
101 | since OpenSSL 0.9.7. | ||
102 | |||
103 | HMAC_Init_ex(), HMAC_Update() and HMAC_Final() did not return values in | ||
104 | versions of OpenSSL before 1.0.0. | ||
105 | |||
106 | =cut | ||