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Diffstat (limited to 'secure/lib/libcrypto/man/RAND_set_rand_method.3')
-rw-r--r-- | secure/lib/libcrypto/man/RAND_set_rand_method.3 | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/secure/lib/libcrypto/man/RAND_set_rand_method.3 b/secure/lib/libcrypto/man/RAND_set_rand_method.3 new file mode 100644 index 0000000..5aa4fb7 --- /dev/null +++ b/secure/lib/libcrypto/man/RAND_set_rand_method.3 @@ -0,0 +1,213 @@ +.\" Automatically generated by Pod::Man v1.37, Pod::Parser v1.14 +.\" +.\" Standard preamble: +.\" ======================================================================== +.de Sh \" Subsection heading +.br +.if t .Sp +.ne 5 +.PP +\fB\\$1\fR +.PP +.. +.de Sp \" Vertical space (when we can't use .PP) +.if t .sp .5v +.if n .sp +.. +.de Vb \" Begin verbatim text +.ft CW +.nf +.ne \\$1 +.. +.de Ve \" End verbatim text +.ft R +.fi +.. +.\" Set up some character translations and predefined strings. \*(-- will +.\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left +.\" double quote, and \*(R" will give a right double quote. | will give a +.\" real vertical bar. \*(C+ will give a nicer C++. Capital omega is used to +.\" do unbreakable dashes and therefore won't be available. \*(C` and \*(C' +.\" expand to `' in nroff, nothing in troff, for use with C<>. +.tr \(*W-|\(bv\*(Tr +.ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p' +.ie n \{\ +. ds -- \(*W- +. ds PI pi +. if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch +. if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch +. ds L" "" +. ds R" "" +. ds C` "" +. ds C' "" +'br\} +.el\{\ +. ds -- \|\(em\| +. ds PI \(*p +. ds L" `` +. ds R" '' +'br\} +.\" +.\" If the F register is turned on, we'll generate index entries on stderr for +.\" titles (.TH), headers (.SH), subsections (.Sh), items (.Ip), and index +.\" entries marked with X<> in POD. Of course, you'll have to process the +.\" output yourself in some meaningful fashion. +.if \nF \{\ +. de IX +. tm Index:\\$1\t\\n%\t"\\$2" +.. +. nr % 0 +. rr F +.\} +.\" +.\" For nroff, turn off justification. 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By modifying the method, alternative implementations such as +hardware RNGs may be used. \s-1IMPORTANT:\s0 See the \s-1NOTES\s0 section for important +information about how these \s-1RAND\s0 \s-1API\s0 functions are affected by the use of +\&\fB\s-1ENGINE\s0\fR \s-1API\s0 calls. +.PP +Initially, the default \s-1RAND_METHOD\s0 is the OpenSSL internal implementation, as +returned by \fIRAND_SSLeay()\fR. +.PP +\&\fIRAND_set_default_method()\fR makes \fBmeth\fR the method for \s-1PRNG\s0 use. \fB\s-1NB\s0\fR: This is +true only whilst no \s-1ENGINE\s0 has been set as a default for \s-1RAND\s0, so this function +is no longer recommended. +.PP +\&\fIRAND_get_default_method()\fR returns a pointer to the current \s-1RAND_METHOD\s0. +However, the meaningfulness of this result is dependant on whether the \s-1ENGINE\s0 +\&\s-1API\s0 is being used, so this function is no longer recommended. +.SH "THE RAND_METHOD STRUCTURE" +.IX Header "THE RAND_METHOD STRUCTURE" +.Vb 9 +\& typedef struct rand_meth_st +\& { +\& void (*seed)(const void *buf, int num); +\& int (*bytes)(unsigned char *buf, int num); +\& void (*cleanup)(void); +\& void (*add)(const void *buf, int num, int entropy); +\& int (*pseudorand)(unsigned char *buf, int num); +\& int (*status)(void); +\& } RAND_METHOD; +.Ve +.PP +The components point to the implementation of \fIRAND_seed()\fR, +\&\fIRAND_bytes()\fR, \fIRAND_cleanup()\fR, \fIRAND_add()\fR, \fIRAND_pseudo_rand()\fR +and \fIRAND_status()\fR. +Each component may be \s-1NULL\s0 if the function is not implemented. +.SH "RETURN VALUES" +.IX Header "RETURN VALUES" +\&\fIRAND_set_rand_method()\fR returns no value. \fIRAND_get_rand_method()\fR and +\&\fIRAND_SSLeay()\fR return pointers to the respective methods. +.SH "NOTES" +.IX Header "NOTES" +As of version 0.9.7, \s-1RAND_METHOD\s0 implementations are grouped together with other +algorithmic APIs (eg. \s-1RSA_METHOD\s0, \s-1EVP_CIPHER\s0, etc) in \fB\s-1ENGINE\s0\fR modules. If a +default \s-1ENGINE\s0 is specified for \s-1RAND\s0 functionality using an \s-1ENGINE\s0 \s-1API\s0 function, +that will override any \s-1RAND\s0 defaults set using the \s-1RAND\s0 \s-1API\s0 (ie. +\&\fIRAND_set_rand_method()\fR). For this reason, the \s-1ENGINE\s0 \s-1API\s0 is the recommended way +to control default implementations for use in \s-1RAND\s0 and other cryptographic +algorithms. +.SH "SEE ALSO" +.IX Header "SEE ALSO" +\&\fIrand\fR\|(3), \fIengine\fR\|(3) +.SH "HISTORY" +.IX Header "HISTORY" +\&\fIRAND_set_rand_method()\fR, \fIRAND_get_rand_method()\fR and \fIRAND_SSLeay()\fR are +available in all versions of OpenSSL. +.PP +In the engine version of version 0.9.6, \fIRAND_set_rand_method()\fR was altered to +take an \s-1ENGINE\s0 pointer as its argument. As of version 0.9.7, that has been +reverted as the \s-1ENGINE\s0 \s-1API\s0 transparently overrides \s-1RAND\s0 defaults if used, +otherwise \s-1RAND\s0 \s-1API\s0 functions work as before. \fIRAND_set_rand_engine()\fR was also +introduced in version 0.9.7. |