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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 | 206 |
1 files changed, 206 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..1252ae0 --- /dev/null +++ b/secure/lib/libcrypto/man/RAND_set_rand_method.3 @@ -0,0 +1,206 @@ +.\" Automatically generated by Pod::Man 2.25 (Pod::Simple 3.23) +.\" +.\" Standard preamble: +.\" ======================================================================== +.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. \*(C+ will +.\" give a nicer C++. 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Always turn off hyphenation; it makes +.\" way too many mistakes in technical documents. +.if n .ad l +.nh +.SH "NAME" +RAND_set_rand_method, RAND_get_rand_method, RAND_SSLeay \- select RAND method +.SH "SYNOPSIS" +.IX Header "SYNOPSIS" +.Vb 1 +\& #include <openssl/rand.h> +\& +\& void RAND_set_rand_method(const RAND_METHOD *meth); +\& +\& const RAND_METHOD *RAND_get_rand_method(void); +\& +\& RAND_METHOD *RAND_SSLeay(void); +.Ve +.SH "DESCRIPTION" +.IX Header "DESCRIPTION" +A \fB\s-1RAND_METHOD\s0\fR specifies the functions that OpenSSL uses for random number +generation. 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 dependent 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. |
