RAND_load_file(3) - NetBSD Manual Pages

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RAND_load_file(3)            OpenSSL            RAND_load_file(3)



NAME

       RAND_load_file, RAND_write_file, RAND_file_name - PRNG
       seed file


LIBRARY

       libcrypto, -lcrypto


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 file-
       name and adds them to the PRNG. If max_bytes is non-nega-
       tive, 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 (cur-
       rently 1024) to file filename which can be used to ini-
       tialize 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

       openssl_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.






2001-04-12                    0.9.6g                            1