RAND_load_file(3)

     RAND_load_file(3)      0.9.6h (2001-03-21)      RAND_load_file(3)

     NAME
          RAND_load_file, RAND_write_file, RAND_file_name - PRNG seed
          file

     SYNOPSIS
           #include <openssl/rand.h>

           const char *RAND_file_name(char *buf, size_t num);

           int RAND_load_file(const char *filename, long max_bytes);

           int RAND_write_file(const char *filename);

     DESCRIPTION
          RAND_file_name() generates a default path for the random
          seed file. buf points to a buffer of size num in which to
          store the filename. The seed file is $RANDFILE if that
          environment variable is set, $HOME/.rnd otherwise. If $HOME
          is not set either, or num is too small for the path name, an
          error occurs.

          RAND_load_file() reads a number of bytes from file filename
          and adds them to the PRNG. If max_bytes is non-negative, up
          to to max_bytes are read; starting with OpenSSL 0.9.5, if
          max_bytes is -1, the complete file is read.

          RAND_write_file() writes a number of random bytes (currently
          1024) to file filename which can be used to initialize the
          PRNG by calling RAND_load_file() in a later session.

     RETURN VALUES
          RAND_load_file() returns the number of bytes read.

          RAND_write_file() returns the number of bytes written, and
          -1 if the bytes written were generated without appropriate
          seed.

          RAND_file_name() returns a pointer to buf on success, and
          NULL on error.

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

     HISTORY
          RAND_load_file(), RAND_write_file() and RAND_file_name() are
          available in all versions of SSLeay and OpenSSL.

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