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NAME

     RAND_bytes, RAND_pseudo_bytes - generate random data



SYNOPSIS
      #include <openssl/rand.h>

      int RAND_bytes(unsigned char *buf, int num);

      int RAND_pseudo_bytes(unsigned char *buf, int num);




DESCRIPTION
     RAND_bytes() puts num cryptographically strong pseudo-random
     bytes into buf. An error occurs if the PRNG has not been
     seeded with enough randomness to ensure an unpredictable
     byte sequence.

     RAND_pseudo_bytes() puts num pseudo-random bytes into 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.



RETURN VALUES
     RAND_bytes() returns 1 on success, 0 otherwise. The error
     code can be obtained by 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.



SEE ALSO
     rand(3), err(3), RAND_add(3)



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.









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Created 1996-2024 by Maxim Chirkov

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