53 lines
1.5 KiB
Text
53 lines
1.5 KiB
Text
=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, int 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. The seed file is $RANDFILE if that environment variable is
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set, $HOME/.rnd otherwise. If $HOME is not set either, or B<num> is
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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 to B<max_bytes> are read; starting with OpenSSL 0.9.5,
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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(3)|rand(3)>, L<RAND_add(3)|RAND_add(3)>, L<RAND_cleanup(3)|RAND_cleanup(3)>
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=head1 HISTORY
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RAND_load_file(), RAND_write_file() and RAND_file_name() are available in
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all versions of SSLeay and OpenSSL.
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=cut
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