68 lines
1.6 KiB
Text
68 lines
1.6 KiB
Text
=pod
|
|
|
|
=head1 NAME
|
|
|
|
RSA_generate_key - Generate RSA key pair
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
#include <openssl/rsa.h>
|
|
|
|
RSA *RSA_generate_key(int num, unsigned long e,
|
|
void (*callback)(int,int,void *), void *cb_arg);
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
RSA_generate_key() generates a key pair and returns it in a newly
|
|
allocated B<RSA> structure. The pseudo-random number generator must
|
|
be seeded prior to calling RSA_generate_key().
|
|
|
|
The modulus size will be B<num> 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 or 65535.
|
|
|
|
A callback function may be used to provide feedback about the
|
|
progress of the key generation. If B<callback> is not B<NULL>, it
|
|
will be called as follows:
|
|
|
|
=over 4
|
|
|
|
=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<callback(2, n, cb_arg)> is called.
|
|
|
|
=item *
|
|
|
|
When a random p has been found with p-1 relatively prime to B<e>,
|
|
it is called as B<callback(3, 0, cb_arg)>.
|
|
|
|
=back
|
|
|
|
The process is then repeated for prime q with B<callback(3, 1, cb_arg)>.
|
|
|
|
=head1 RETURN VALUE
|
|
|
|
If key generation fails, RSA_generate_key() returns B<NULL>; the
|
|
error codes can be obtained by ERR_get_error(3).
|
|
|
|
=head1 BUGS
|
|
|
|
B<callback(2, x, cb_arg)> is used with two different meanings.
|
|
|
|
RSA_generate_key() goes into an infinite loop for illegal input values.
|
|
|
|
=head1 SEE ALSO
|
|
|
|
err(3), rand(3), rsa(3), RSA_free(3)
|
|
|
|
=head1 HISTORY
|
|
|
|
The B<cb_arg> argument was added in SSLeay 0.9.0.
|
|
|
|
=cut
|