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6859cf7459
manual when the specific function is refered to in the current manual text. This correction was originally introduced in OpenBSD's tracking of OpenSSL.
48 lines
1.4 KiB
Plaintext
48 lines
1.4 KiB
Plaintext
=pod
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=head1 NAME
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RAND_bytes, RAND_pseudo_bytes - generate random data
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=head1 SYNOPSIS
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#include <openssl/rand.h>
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int RAND_bytes(unsigned char *buf, int num);
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int RAND_pseudo_bytes(unsigned char *buf, int num);
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=head1 DESCRIPTION
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RAND_bytes() puts B<num> cryptographically strong pseudo-random bytes
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into B<buf>. An error occurs if the PRNG has not been seeded with
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enough randomness to ensure an unpredictable byte sequence.
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RAND_pseudo_bytes() puts B<num> pseudo-random bytes into B<buf>.
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Pseudo-random byte sequences generated by RAND_pseudo_bytes() will be
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unique if they are of sufficient length, but are not necessarily
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unpredictable. They can be used for non-cryptographic purposes and for
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certain purposes in cryptographic protocols, but usually not for key
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generation etc.
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=head1 RETURN VALUES
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RAND_bytes() returns 1 on success, 0 otherwise. The error code can be
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obtained by L<ERR_get_error(3)|ERR_get_error(3)>. RAND_pseudo_bytes() returns 1 if the
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bytes generated are cryptographically strong, 0 otherwise. Both
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functions return -1 if they are not supported by the current RAND
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method.
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=head1 SEE ALSO
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L<rand(3)|rand(3)>, L<ERR_get_error(3)|ERR_get_error(3)>,
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L<RAND_add(3)|RAND_add(3)>
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=head1 HISTORY
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RAND_bytes() is available in all versions of SSLeay and OpenSSL. It
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has a return value since OpenSSL 0.9.5. RAND_pseudo_bytes() was added
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in OpenSSL 0.9.5.
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=cut
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