mirror of
https://github.com/openssl/openssl.git
synced 2024-12-04 07:24:52 +08:00
aafbe1ccd2
PR#3071 The primary changes made are: - Updates to the "NAME" section of many pages to correctly reflect the functions defined on those pages. This section is automatically parsed by the util/extract-names.pl script, so if it is not correct then running "man" will not correctly locate the right manual pages. - Updates to take account of where functions are now deprecated - Full documentation of the ec sub-library - A number of other typo corrections and other minor tweaks
122 lines
3.8 KiB
Plaintext
122 lines
3.8 KiB
Plaintext
=pod
|
|
|
|
=head1 NAME
|
|
|
|
DSA_generate_parameters_ex, DSA_generate_parameters - generate DSA parameters
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
#include <openssl/dsa.h>
|
|
|
|
int DSA_generate_parameters_ex(DSA *dsa, int bits,
|
|
const unsigned char *seed,int seed_len,
|
|
int *counter_ret, unsigned long *h_ret, BN_GENCB *cb);
|
|
|
|
Deprecated:
|
|
|
|
DSA *DSA_generate_parameters(int bits, unsigned char *seed,
|
|
int seed_len, int *counter_ret, unsigned long *h_ret,
|
|
void (*callback)(int, int, void *), void *cb_arg);
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
DSA_generate_parameters_ex() generates primes p and q and a generator g
|
|
for use in the DSA and stores the result in B<dsa>.
|
|
|
|
B<bits> is the length of the prime to be generated; the DSS allows a
|
|
maximum of 1024 bits.
|
|
|
|
If B<seed> is B<NULL> or B<seed_len> E<lt> 20, the primes will be
|
|
generated at random. Otherwise, the seed is used to generate
|
|
them. If the given seed does not yield a prime q, a new random
|
|
seed is chosen and placed at B<seed>.
|
|
|
|
DSA_generate_parameters_ex() places the iteration count in
|
|
*B<counter_ret> and a counter used for finding a generator in
|
|
*B<h_ret>, unless these are B<NULL>.
|
|
|
|
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 shown below. For information on the BN_GENCB structure and the
|
|
BN_GENCB_call function discussed below, refer to
|
|
L<BN_generate_prime(3)|BN_generate_prime(3)>.
|
|
|
|
=over 4
|
|
|
|
=item *
|
|
|
|
When a candidate for q is generated, B<BN_GENCB_call(cb, 0, m++)> is called
|
|
(m is 0 for the first candidate).
|
|
|
|
=item *
|
|
|
|
When a candidate for q has passed a test by trial division,
|
|
B<BN_GENCB_call(cb, 1, -1)> is called.
|
|
While a candidate for q is tested by Miller-Rabin primality tests,
|
|
B<BN_GENCB_call(cb, 1, i)> is called in the outer loop
|
|
(once for each witness that confirms that the candidate may be prime);
|
|
i is the loop counter (starting at 0).
|
|
|
|
=item *
|
|
|
|
When a prime q has been found, B<BN_GENCB_call(cb, 2, 0)> and
|
|
B<BN_GENCB_call(cb, 3, 0)> are called.
|
|
|
|
=item *
|
|
|
|
Before a candidate for p (other than the first) is generated and tested,
|
|
B<BN_GENCB_call(cb, 0, counter)> is called.
|
|
|
|
=item *
|
|
|
|
When a candidate for p has passed the test by trial division,
|
|
B<BN_GENCB_call(cb, 1, -1)> is called.
|
|
While it is tested by the Miller-Rabin primality test,
|
|
B<BN_GENCB_call(cb, 1, i)> is called in the outer loop
|
|
(once for each witness that confirms that the candidate may be prime).
|
|
i is the loop counter (starting at 0).
|
|
|
|
=item *
|
|
|
|
When p has been found, B<BN_GENCB_call(cb, 2, 1)> is called.
|
|
|
|
=item *
|
|
|
|
When the generator has been found, B<BN_GENCB_call(cb, 3, 1)> is called.
|
|
|
|
=back
|
|
|
|
DSA_generate_parameters() (deprecated) works in much the same way as for DSA_generate_parameters_ex, except that no B<dsa> parameter is passed and
|
|
instead a newly allocated B<DSA> structure is returned. Additionally "old
|
|
style" callbacks are used instead of the newer BN_GENCB based approach.
|
|
Refer to L<BN_generate_prime(3)|BN_generate_prime(3)> for further information.
|
|
|
|
=head1 RETURN VALUE
|
|
|
|
DSA_generate_parameters_ex() returns a 1 on success, or 0 otherwise.
|
|
|
|
DSA_generate_parameters() returns a pointer to the DSA structure, or
|
|
B<NULL> if the parameter generation fails.
|
|
|
|
The error codes can be obtained by L<ERR_get_error(3)|ERR_get_error(3)>.
|
|
|
|
=head1 BUGS
|
|
|
|
Seed lengths E<gt> 20 are not supported.
|
|
|
|
=head1 SEE ALSO
|
|
|
|
L<dsa(3)|dsa(3)>, L<ERR_get_error(3)|ERR_get_error(3)>, L<rand(3)|rand(3)>,
|
|
L<DSA_free(3)|DSA_free(3)>, L<BN_generate_prime(3)|BN_generate_prime(3)>
|
|
|
|
=head1 HISTORY
|
|
|
|
DSA_generate_parameters() appeared in SSLeay 0.8. The B<cb_arg>
|
|
argument was added in SSLeay 0.9.0.
|
|
In versions up to OpenSSL 0.9.4, B<callback(1, ...)> was called
|
|
in the inner loop of the Miller-Rabin test whenever it reached the
|
|
squaring step (the parameters to B<callback> did not reveal how many
|
|
witnesses had been tested); since OpenSSL 0.9.5, B<callback(1, ...)>
|
|
is called as in BN_is_prime(3), i.e. once for each witness.
|
|
=cut
|