60 lines
1.5 KiB
Plaintext
60 lines
1.5 KiB
Plaintext
=pod
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=head1 NAME
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RAND_set_rand_method, RAND_get_rand_method, RAND_SSLeay - select RAND method
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=head1 SYNOPSIS
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#include <openssl/rand.h>
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void RAND_set_rand_method(RAND_METHOD *meth);
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RAND_METHOD *RAND_get_rand_method(void);
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RAND_METHOD *RAND_SSLeay(void);
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=head1 DESCRIPTION
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A B<RAND_METHOD> specifies the functions that OpenSSL uses for random
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number generation. By modifying the method, alternative
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implementations such as hardware RNGs may be used. Initially, the
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default is to use the OpenSSL internal implementation. RAND_SSLeay()
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returns a pointer to that method.
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RAND_set_rand_method() sets the RAND method to B<meth>.
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RAND_get_rand_method() returns a pointer to the current method.
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=head1 THE RAND_METHOD STRUCTURE
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typedef struct rand_meth_st
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{
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void (*seed)(const void *buf, int num);
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int (*bytes)(unsigned char *buf, int num);
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void (*cleanup)(void);
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void (*add)(const void *buf, int num, int entropy);
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int (*pseudorand)(unsigned char *buf, int num);
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int (*status)(void);
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} RAND_METHOD;
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The components point to the implementation of RAND_seed(),
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RAND_bytes(), RAND_cleanup(), RAND_add(), RAND_pseudo_rand()
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and RAND_status().
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Each component may be NULL if the function is not implemented.
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=head1 RETURN VALUES
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RAND_set_rand_method() returns no value. RAND_get_rand_method() and
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RAND_SSLeay() return pointers to the respective methods.
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=head1 SEE ALSO
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L<rand(3)|rand(3)>
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=head1 HISTORY
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RAND_set_rand_method(), RAND_get_rand_method() and RAND_SSLeay() are
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available in all versions of OpenSSL.
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=cut
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