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44 lines
1.1 KiB
Plaintext
44 lines
1.1 KiB
Plaintext
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=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> random bytes into B<buf>. An error occurs if
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the PRNG has not been seeded with enough randomness.
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RAND_pseudo_bytes() puts B<num> pseudo-random bytes into B<buf>. These
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bytes are guaranteed to be unique, but not unpredictable. They can be
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used for non-cryptographic purposes and for certain purposes in
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cryptographic protocols, but not for key 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 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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rand(3), err(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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