RSA_generate_key(3)

     RSA_generate_key(3)    0.9.6h (2002-09-25)    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:

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

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

          o   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.

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