1RAND_load_file(3)                   OpenSSL                  RAND_load_file(3)
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NAME

6       RAND_load_file, RAND_write_file, RAND_file_name - PRNG seed file
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SYNOPSIS

9        #include <openssl/rand.h>
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11        const char *RAND_file_name(char *buf, size_t num);
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13        int RAND_load_file(const char *filename, long max_bytes);
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15        int RAND_write_file(const char *filename);
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DESCRIPTION

18       RAND_file_name() generates a default path for the random seed file. buf
19       points to a buffer of size num in which to store the filename. The seed
20       file is $RANDFILE if that environment variable is set, $HOME/.rnd
21       otherwise. If $HOME is not set either, or num is too small for the path
22       name, an error occurs.
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24       RAND_load_file() reads a number of bytes from file filename and adds
25       them to the PRNG. If max_bytes is non-negative, up to to max_bytes are
26       read; starting with OpenSSL 0.9.5, if max_bytes is -1, the complete
27       file is read.
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29       RAND_write_file() writes a number of random bytes (currently 1024) to
30       file filename which can be used to initialize the PRNG by calling
31       RAND_load_file() in a later session.
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RETURN VALUES

34       RAND_load_file() returns the number of bytes read.
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36       RAND_write_file() returns the number of bytes written, and -1 if the
37       bytes written were generated without appropriate seed.
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39       RAND_file_name() returns a pointer to buf on success, and NULL on
40       error.
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SEE ALSO

43       rand(3), RAND_add(3), RAND_cleanup(3)
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HISTORY

46       RAND_load_file(), RAND_write_file() and RAND_file_name() are available
47       in all versions of SSLeay and OpenSSL.
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511.0.2k                            2017-01-26                 RAND_load_file(3)