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b97fdb57a2
Reviewed-by: Rich Salz <rsalz@openssl.org> (Merged from https://github.com/openssl/openssl/pull/1900)
80 lines
1.9 KiB
Plaintext
80 lines
1.9 KiB
Plaintext
=pod
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=head1 NAME
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RAND_load_file, RAND_write_file, RAND_file_name - PRNG seed file
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=head1 SYNOPSIS
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#include <openssl/rand.h>
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const char *RAND_file_name(char *buf, size_t num);
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int RAND_load_file(const char *filename, long max_bytes);
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int RAND_write_file(const char *filename);
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=head1 DESCRIPTION
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RAND_file_name() generates a default path for the random seed
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file. B<buf> points to a buffer of size B<num> in which to store the
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filename.
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On all systems, if the environment variable B<RANDFILE> is set, its
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value will be used as the seed file name.
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Otherwise, the file is called ".rnd", found in platform dependent locations:
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=over 4
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=item On Windows (in order of preference)
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%HOME%, %USERPROFILE%, %SYSTEMROOT%, C:\
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=item On VMS
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SYS$LOGIN:
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=item On all other systems
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$HOME
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=back
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If C<$HOME> (on non-Windows and non-VMS system) is not set either, or
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B<num> is too small for the path name, an error occurs.
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RAND_load_file() reads a number of bytes from file B<filename> and
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adds them to the PRNG. If B<max_bytes> is non-negative,
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up to B<max_bytes> are read;
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if B<max_bytes> is -1, the complete file is read.
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RAND_write_file() writes a number of random bytes (currently 1024) to
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file B<filename> which can be used to initialize the PRNG by calling
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RAND_load_file() in a later session.
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=head1 RETURN VALUES
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RAND_load_file() returns the number of bytes read.
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RAND_write_file() returns the number of bytes written, and -1 if the
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bytes written were generated without appropriate seed.
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RAND_file_name() returns a pointer to B<buf> on success, and NULL on
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error.
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=head1 SEE ALSO
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L<RAND_bytes(3)>, L<RAND_add(3)>, L<RAND_cleanup(3)>
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=head1 COPYRIGHT
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Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the OpenSSL license (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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