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Diffstat (limited to 'doc/man3/DSA_generate_parameters.pod')
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diff --git a/doc/man3/DSA_generate_parameters.pod b/doc/man3/DSA_generate_parameters.pod new file mode 100644 index 000000000000..970f6a6b08af --- /dev/null +++ b/doc/man3/DSA_generate_parameters.pod @@ -0,0 +1,126 @@ +=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 |