X-Git-Url: https://git.openssl.org/gitweb/?p=openssl.git;a=blobdiff_plain;f=doc%2Fcrypto%2FDSA_generate_parameters.pod;h=92c89a07eb6ac0af80b189be0ea1563c13cdc61b;hp=44c38b90c1cf173253bedab70ced0c819b094f76;hb=f00a10b89734e84fe80f98ad9e2e77b557c701ae;hpb=1749d8a039e637a6ab06f30cd0351605b44dc625

diff --git a/doc/crypto/DSA_generate_parameters.pod b/doc/crypto/DSA_generate_parameters.pod
index 44c38b90c1..92c89a07eb 100644
--- a/doc/crypto/DSA_generate_parameters.pod
+++ b/doc/crypto/DSA_generate_parameters.pod
@@ -2,87 +2,102 @@
 
 =head1 NAME
 
-DSA_generate_parameters - Generate DSA parameters
+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)(), void *cb_arg);
+		void (*callback)(int, int, void *), void *cb_arg);
 
 =head1 DESCRIPTION
 
-DSA_generate_parameters() generates primes p and q and a generator g
-for use in the DSA.
+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.
+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
+at least 2048, it is set to 256 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>.
+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() places the iteration count in
+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<callback> is not B<NULL>, it will be
-called as follows:
+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)>.
 
 =over 4
 
 =item *
 
-When a candidate for q is generated, B<callback(0, m++, cb_arg)> is called
+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<callback(1, -1, cb_arg)> is called.
+B<BN_GENCB_call(cb, 1, -1)> is called.
 While a candidate for q is tested by Miller-Rabin primality tests,
-B<callback(1, i, cb_arg)> is called in the outer loop
+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<callback(2, 0, cb_arg)> and
-B<callback(3, 0, cb_arg)> are called.
+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<callback(0, counter, cb_arg)> is called.
+B<BN_GENCB_call(cb, 0, counter)> is called.
 
 =item *
 
 When a candidate for p has passed the test by trial division,
-B<callback(1, -1, cb_arg)> is called.
+B<BN_GENCB_call(cb, 1, -1)> is called.
 While it is tested by the Miller-Rabin primality test,
-B<callback(1, i, cb_arg)> is called in the outer loop
+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<callback(2, 1, cb_arg)> is called.
+When p has been found, B<BN_GENCB_call(cb, 2, 1)> is called.
 
 =item *
 
-When the generator has been found, B<callback(3, 1, cb_arg)> is called.
+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)> 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)>.
+B<NULL> if the parameter generation fails.
+
+The error codes can be obtained by L<ERR_get_error(3)>.
 
 =head1 BUGS
 
@@ -90,8 +105,8 @@ Seed lengths E<gt> 20 are not supported.
 
 =head1 SEE ALSO
 
-L<dsa(3)|dsa(3)>, L<err(3)|err(3)>, L<rand(3)|rand(3)>,
-L<DSA_free(3)|DSA_free(3)>
+L<dsa(3)>, L<ERR_get_error(3)>, L<rand(3)>,
+L<DSA_free(3)>, L<BN_generate_prime(3)>
 
 =head1 HISTORY