RAND_pseudo_bytes man page on DigitalUNIX

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RAND_bytes(3)							 RAND_bytes(3)

       RAND_bytes, RAND_pseudo_bytes - Generate random data

       #include <openssl/rand.h>

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

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

       The RAND_pseudo_bytes() function puts num pseudo-random bytes into buf.
       Pseudo-random byte sequences generated by the RAND_pseudo_bytes() func‐
       tion  will be unique if they are of sufficient length, but are not nec‐
       essarily unpredictable.	They can be used  for  non-cryptographic  pur‐
       poses  and for certain purposes in cryptographic protocols, but usually
       not for key generation etc.

       The RAND_bytes() functon returns 1 on success, 0 otherwise.  The	 error
       code  can be obtained by using ERR_get_error(). The RAND_pseudo_bytes()
       function 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.

       The RAND_bytes() function is available in all versions  of  SSLeay  and
       OpenSSL.	   It	has   a	  return   value   since  OpenSSL  0.9.5.  The
       RAND_pseudo_bytes() function was added in OpenSSL 0.9.5.

       Functions: rand_ssl(3), err(3), RAND_add(3)


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