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author | marha <marha@users.sourceforge.net> | 2009-06-28 22:07:26 +0000 |
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committer | marha <marha@users.sourceforge.net> | 2009-06-28 22:07:26 +0000 |
commit | 3562e78743202e43aec8727005182a2558117eca (patch) | |
tree | 8f9113a77d12470c5c851a2a8e4cb02e89df7d43 /openssl/doc/crypto/RAND_bytes.pod | |
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Diffstat (limited to 'openssl/doc/crypto/RAND_bytes.pod')
-rw-r--r-- | openssl/doc/crypto/RAND_bytes.pod | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/openssl/doc/crypto/RAND_bytes.pod b/openssl/doc/crypto/RAND_bytes.pod new file mode 100644 index 000000000..1a9b91e28 --- /dev/null +++ b/openssl/doc/crypto/RAND_bytes.pod @@ -0,0 +1,50 @@ +=pod + +=head1 NAME + +RAND_bytes, RAND_pseudo_bytes - generate random data + +=head1 SYNOPSIS + + #include <openssl/rand.h> + + int RAND_bytes(unsigned char *buf, int num); + + int RAND_pseudo_bytes(unsigned char *buf, int num); + +=head1 DESCRIPTION + +RAND_bytes() puts B<num> cryptographically strong pseudo-random bytes +into B<buf>. An error occurs if the PRNG has not been seeded with +enough randomness to ensure an unpredictable byte sequence. + +RAND_pseudo_bytes() puts B<num> pseudo-random bytes into B<buf>. +Pseudo-random byte sequences generated by RAND_pseudo_bytes() will be +unique if they are of sufficient length, but are not necessarily +unpredictable. They can be used for non-cryptographic purposes and for +certain purposes in cryptographic protocols, but usually not for key +generation etc. + +The contents of B<buf> is mixed into the entropy pool before retrieving +the new pseudo-random bytes unless disabled at compile time (see FAQ). + +=head1 RETURN VALUES + +RAND_bytes() returns 1 on success, 0 otherwise. The error code can be +obtained by L<ERR_get_error(3)|ERR_get_error(3)>. RAND_pseudo_bytes() returns 1 if the +bytes generated are cryptographically strong, 0 otherwise. Both +functions return -1 if they are not supported by the current RAND +method. + +=head1 SEE ALSO + +L<rand(3)|rand(3)>, L<ERR_get_error(3)|ERR_get_error(3)>, +L<RAND_add(3)|RAND_add(3)> + +=head1 HISTORY + +RAND_bytes() is available in all versions of SSLeay and OpenSSL. It +has a return value since OpenSSL 0.9.5. RAND_pseudo_bytes() was added +in OpenSSL 0.9.5. + +=cut |