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RSA_generate_key(3)                                OpenSSL                               RSA_generate_key(3)



NAME
       RSA_generate_key - generate RSA key pair

SYNOPSIS
        #include <openssl/rsa.h>

        RSA *RSA_generate_key(int num, unsigned long e,
           void (*callback)(int,int,void *), void *cb_arg);

DESCRIPTION
       RSA_generate_key() generates a key pair and returns it in a newly allocated RSA structure. The
       pseudo-random number generator must be seeded prior to calling RSA_generate_key().

       The modulus size will be num bits, and the public exponent will be e. Key sizes with num < 1024
       should be considered insecure.  The exponent is an odd number, typically 3, 17 or 65537.

       A callback function may be used to provide feedback about the progress of the key generation. If
       callback is not NULL, it will be called as follows:

       •   While a random prime number is generated, it is called as described in BN_generate_prime(3).

       •   When the n-th randomly generated prime is rejected as not suitable for the key, callback(2, n,
           cb_arg) is called.

       •   When a random p has been found with p-1 relatively prime to e, it is called as callback(3, 0,
           cb_arg).

       The process is then repeated for prime q with callback(3, 1, cb_arg).

RETURN VALUE
       If key generation fails, RSA_generate_key() returns NULL; the error codes can be obtained by
       ERR_get_error(3).

BUGS
       callback(2, x, cb_arg) is used with two different meanings.

       RSA_generate_key() goes into an infinite loop for illegal input values.

SEE ALSO
       ERR_get_error(3), rand(3), rsa(3), RSA_free(3)

HISTORY
       The cb_arg argument was added in SSLeay 0.9.0.



50                                               2013-03-05                              RSA_generate_key(3)