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author | schwarze <> | 2016-11-04 10:17:17 +0000 |
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committer | schwarze <> | 2016-11-04 10:17:17 +0000 |
commit | 195fe5e91c60bd205043b4bea113abdff1c67bcc (patch) | |
tree | 1d15fe02d83a7ffb422ebe78c34ee1117da63e59 /src/lib/libcrypto/doc/RSA_get_ex_new_index.pod | |
parent | 00872265b9546fcf2d5795aa3a120c35142d268b (diff) | |
download | openbsd-195fe5e91c60bd205043b4bea113abdff1c67bcc.tar.gz openbsd-195fe5e91c60bd205043b4bea113abdff1c67bcc.tar.bz2 openbsd-195fe5e91c60bd205043b4bea113abdff1c67bcc.zip |
convert RSA manuals from pod to mdoc
Diffstat (limited to 'src/lib/libcrypto/doc/RSA_get_ex_new_index.pod')
-rw-r--r-- | src/lib/libcrypto/doc/RSA_get_ex_new_index.pod | 122 |
1 files changed, 0 insertions, 122 deletions
diff --git a/src/lib/libcrypto/doc/RSA_get_ex_new_index.pod b/src/lib/libcrypto/doc/RSA_get_ex_new_index.pod deleted file mode 100644 index b1ac1167dd..0000000000 --- a/src/lib/libcrypto/doc/RSA_get_ex_new_index.pod +++ /dev/null | |||
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1 | =pod | ||
2 | |||
3 | =head1 NAME | ||
4 | |||
5 | RSA_get_ex_new_index, RSA_set_ex_data, RSA_get_ex_data - add application | ||
6 | specific data to RSA structures | ||
7 | |||
8 | =head1 SYNOPSIS | ||
9 | |||
10 | #include <openssl/rsa.h> | ||
11 | |||
12 | int RSA_get_ex_new_index(long argl, void *argp, | ||
13 | CRYPTO_EX_new *new_func, | ||
14 | CRYPTO_EX_dup *dup_func, | ||
15 | CRYPTO_EX_free *free_func); | ||
16 | |||
17 | int RSA_set_ex_data(RSA *r, int idx, void *arg); | ||
18 | |||
19 | void *RSA_get_ex_data(RSA *r, int idx); | ||
20 | |||
21 | typedef int CRYPTO_EX_new(void *parent, void *ptr, CRYPTO_EX_DATA *ad, | ||
22 | int idx, long argl, void *argp); | ||
23 | typedef void CRYPTO_EX_free(void *parent, void *ptr, CRYPTO_EX_DATA *ad, | ||
24 | int idx, long argl, void *argp); | ||
25 | typedef int CRYPTO_EX_dup(CRYPTO_EX_DATA *to, CRYPTO_EX_DATA *from, void *from_d, | ||
26 | int idx, long argl, void *argp); | ||
27 | |||
28 | =head1 DESCRIPTION | ||
29 | |||
30 | Several OpenSSL structures can have application specific data attached to them. | ||
31 | This has several potential uses, it can be used to cache data associated with | ||
32 | a structure (for example the hash of some part of the structure) or some | ||
33 | additional data (for example a handle to the data in an external library). | ||
34 | |||
35 | Since the application data can be anything at all it is passed and retrieved | ||
36 | as a B<void *> type. | ||
37 | |||
38 | The B<RSA_get_ex_new_index()> function is initially called to "register" some | ||
39 | new application specific data. It takes three optional function pointers which | ||
40 | are called when the parent structure (in this case an RSA structure) is | ||
41 | initially created, when it is copied and when it is freed up. If any or all of | ||
42 | these function pointer arguments are not used they should be set to NULL. The | ||
43 | precise manner in which these function pointers are called is described in more | ||
44 | detail below. B<RSA_get_ex_new_index()> also takes additional long and pointer | ||
45 | parameters which will be passed to the supplied functions but which otherwise | ||
46 | have no special meaning. It returns an B<index> which should be stored | ||
47 | (typically in a static variable) and passed used in the B<idx> parameter in | ||
48 | the remaining functions. Each successful call to B<RSA_get_ex_new_index()> | ||
49 | will return an index greater than any previously returned, this is important | ||
50 | because the optional functions are called in order of increasing index value. | ||
51 | |||
52 | B<RSA_set_ex_data()> is used to set application specific data, the data is | ||
53 | supplied in the B<arg> parameter and its precise meaning is up to the | ||
54 | application. | ||
55 | |||
56 | B<RSA_get_ex_data()> is used to retrieve application specific data. The data | ||
57 | is returned to the application, this will be the same value as supplied to | ||
58 | a previous B<RSA_set_ex_data()> call. | ||
59 | |||
60 | B<new_func()> is called when a structure is initially allocated (for example | ||
61 | with B<RSA_new()>. The parent structure members will not have any meaningful | ||
62 | values at this point. This function will typically be used to allocate any | ||
63 | application specific structure. | ||
64 | |||
65 | B<free_func()> is called when a structure is being freed up. The dynamic parent | ||
66 | structure members should not be accessed because they will be freed up when | ||
67 | this function is called. | ||
68 | |||
69 | B<new_func()> and B<free_func()> take the same parameters. B<parent> is a | ||
70 | pointer to the parent RSA structure. B<ptr> is a the application specific data | ||
71 | (this wont be of much use in B<new_func()>. B<ad> is a pointer to the | ||
72 | B<CRYPTO_EX_DATA> structure from the parent RSA structure: the functions | ||
73 | B<CRYPTO_get_ex_data()> and B<CRYPTO_set_ex_data()> can be called to manipulate | ||
74 | it. The B<idx> parameter is the index: this will be the same value returned by | ||
75 | B<RSA_get_ex_new_index()> when the functions were initially registered. Finally | ||
76 | the B<argl> and B<argp> parameters are the values originally passed to the same | ||
77 | corresponding parameters when B<RSA_get_ex_new_index()> was called. | ||
78 | |||
79 | B<dup_func()> is called when a structure is being copied. Pointers to the | ||
80 | destination and source B<CRYPTO_EX_DATA> structures are passed in the B<to> and | ||
81 | B<from> parameters respectively. The B<from_d> parameter is passed a pointer to | ||
82 | the source application data when the function is called, when the function | ||
83 | returns the value is copied to the destination: the application can thus modify | ||
84 | the data pointed to by B<from_d> and have different values in the source and | ||
85 | destination. The B<idx>, B<argl> and B<argp> parameters are the same as those | ||
86 | in B<new_func()> and B<free_func()>. | ||
87 | |||
88 | =head1 RETURN VALUES | ||
89 | |||
90 | B<RSA_get_ex_new_index()> returns a new index or -1 on failure (note 0 is a | ||
91 | valid index value). | ||
92 | |||
93 | B<RSA_set_ex_data()> returns 1 on success or 0 on failure. | ||
94 | |||
95 | B<RSA_get_ex_data()> returns the application data or 0 on failure. 0 may also | ||
96 | be valid application data but currently it can only fail if given an invalid | ||
97 | B<idx> parameter. | ||
98 | |||
99 | B<new_func()> and B<dup_func()> should return 0 for failure and 1 for success. | ||
100 | |||
101 | On failure an error code can be obtained from | ||
102 | L<ERR_get_error(3)|ERR_get_error(3)>. | ||
103 | |||
104 | =head1 BUGS | ||
105 | |||
106 | B<dup_func()> is currently never called. | ||
107 | |||
108 | The return value of B<new_func()> is ignored. | ||
109 | |||
110 | The B<new_func()> function isn't very useful because no meaningful values are | ||
111 | present in the parent RSA structure when it is called. | ||
112 | |||
113 | =head1 SEE ALSO | ||
114 | |||
115 | L<rsa(3)|rsa(3)>, L<CRYPTO_set_ex_data(3)|CRYPTO_set_ex_data(3)> | ||
116 | |||
117 | =head1 HISTORY | ||
118 | |||
119 | RSA_get_ex_new_index(), RSA_set_ex_data() and RSA_get_ex_data() are | ||
120 | available since SSLeay 0.9.0. | ||
121 | |||
122 | =cut | ||