a528d4f0a9
If something was "present in all versions" of SSLeay, or if it was added to a version of SSLeay (and therefore predates OpenSSL), remove mention of it. Documentation history now starts with OpenSSL. Remove mention of all history before OpenSSL 0.9.8, inclusive. Remove all AUTHOR sections. Reviewed-by: Tim Hudson <tjh@openssl.org>
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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Deprecated:
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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() has been deprecated. Users should use RAND_bytes() instead.
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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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The contents of B<buf> is mixed into the entropy pool before retrieving
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the new pseudo-random bytes unless disabled at compile time (see FAQ).
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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)>. 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)>, L<ERR_get_error(3)>,
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L<RAND_add(3)>
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=cut
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