mirror of
https://github.com/openssl/openssl.git
synced 2024-11-27 05:21:51 +08:00
61f805c1d5
Because the related PR/commits are merged in 2018... Reviewed-by: Andy Polyakov <appro@openssl.org> Reviewed-by: Matt Caswell <matt@openssl.org> (Merged from https://github.com/openssl/openssl/pull/4976)
127 lines
3.8 KiB
Plaintext
127 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:
|
|
|
|
#if OPENSSL_API_COMPAT < 0x00908000L
|
|
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);
|
|
#endif
|
|
|
|
=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 p to be generated.
|
|
For lengths under 2048 bits, the length of q is 160 bits; for lengths
|
|
greater than or equal to 2048 bits, the length of q is set to 256 bits.
|
|
|
|
If B<seed> is NULL, the primes will be generated at random.
|
|
If B<seed_len> is less than the length of q, an error is returned.
|
|
|
|
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)>.
|
|
|
|
DSA_generate_prime() is similar to DSA_generate_prime_ex() but
|
|
expects an old-style callback function; see
|
|
L<BN_generate_prime(3)> for information on the old-style callback.
|
|
|
|
=over 2
|
|
|
|
=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
|
|
|
|
=head1 RETURN VALUES
|
|
|
|
DSA_generate_parameters_ex() returns a 1 on success, or 0 otherwise.
|
|
The error codes can be obtained by L<ERR_get_error(3)>.
|
|
|
|
DSA_generate_parameters() returns a pointer to the DSA structure or
|
|
B<NULL> if the parameter generation fails.
|
|
|
|
=head1 BUGS
|
|
|
|
Seed lengths greater than 20 are not supported.
|
|
|
|
=head1 SEE ALSO
|
|
|
|
L<DSA_new(3)>, L<ERR_get_error(3)>, L<RAND_bytes(3)>,
|
|
L<DSA_free(3)>, L<BN_generate_prime(3)>
|
|
|
|
=head1 HISTORY
|
|
|
|
DSA_generate_parameters() was deprecated in OpenSSL 0.9.8; use
|
|
DSA_generate_parameters_ex() instead.
|
|
|
|
=head1 COPYRIGHT
|
|
|
|
Copyright 2000-2018 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
|