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=pod
=head1 NAME
RSA_generate_key_ex, RSA_generate_key - generate RSA key pair
=head1 SYNOPSIS
#include <openssl/rsa.h>
int RSA_generate_key_ex(RSA *rsa, int bits, BIGNUM *e, BN_GENCB *cb);
Deprecated:
#if OPENSSL_API_COMPAT < 0x00908000L
RSA *RSA_generate_key(int num, unsigned long e,
void (*callback)(int, int, void *), void *cb_arg);
#endif
=head1 DESCRIPTION
RSA_generate_key_ex() generates a key pair and stores it in the B<RSA>
structure provided in B<rsa>. The pseudo-random number generator must
be seeded prior to calling RSA_generate_key_ex().
The modulus size will be of length B<bits>, and the public exponent will be
B<e>. Key sizes with B<num> E<lt> 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 B<cb> is not B<NULL>, it
will be called as follows using the BN_GENCB_call() function
described on the L<BN_generate_prime(3)> page.
=over 2
=item *
While a random prime number is generated, it is called as
described in L<BN_generate_prime(3)>.
=item *
When the n-th randomly generated prime is rejected as not
suitable for the key, B<BN_GENCB_call(cb, 2, n)> is called.
=item *
When a random p has been found with p-1 relatively prime to B<e>,
it is called as B<BN_GENCB_call(cb, 3, 0)>.
=back
The process is then repeated for prime q with B<BN_GENCB_call(cb, 3, 1)>.
RSA_generate_key() is deprecated (new applications should use
RSA_generate_key_ex() instead). RSA_generate_key() works in the same way as
RSA_generate_key_ex() except it uses "old style" call backs. See
L<BN_generate_prime(3)> for further details.
=head1 RETURN VALUE
RSA_generate_key_ex() returns 1 on success or 0 on error.
RSA_generate_key() returns the key on success or B<NULL> on error.
The error codes can be obtained by L<ERR_get_error(3)>.
=head1 BUGS
B<BN_GENCB_call(cb, 2, x)> is used with two different meanings.
RSA_generate_key() goes into an infinite loop for illegal input values.
=head1 SEE ALSO
L<ERR_get_error(3)>, L<RAND_bytes(3)>,
L<RSA_generate_key(3)>, L<BN_generate_prime(3)>
=head1 COPYRIGHT
Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the OpenSSL license (the "License"). You may not use
this file except in compliance with the License. You can obtain a copy
in the file LICENSE in the source distribution or at
L<https://www.openssl.org/source/license.html>.
=cut
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