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+.\" ======================================================================
+.\"
+.IX Title "DSA_GENERATE_PARAMETERS 1"
+.TH DSA_GENERATE_PARAMETERS 1 "perl v5.6.1" "2000-04-13" "User Contributed Perl Documentation"
+.UC
+.SH "NAME"
+DSA_generate_parameters \- generate \s-1DSA\s0 parameters
+.SH "SYNOPSIS"
+.IX Header "SYNOPSIS"
+.Vb 1
+\& #include <openssl/dsa.h>
+.Ve
+.Vb 3
+\& 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);
+.Ve
+.SH "DESCRIPTION"
+.IX Header "DESCRIPTION"
+\&\fIDSA_generate_parameters()\fR generates primes p and q and a generator g
+for use in the \s-1DSA\s0.
+.PP
+\&\fBbits\fR is the length of the prime to be generated; the \s-1DSS\s0 allows a
+maximum of 1024 bits.
+.PP
+If \fBseed\fR is \fB\s-1NULL\s0\fR or \fBseed_len\fR < 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 \fBseed\fR.
+.PP
+\&\fIDSA_generate_parameters()\fR places the iteration count in
+*\fBcounter_ret\fR and a counter used for finding a generator in
+*\fBh_ret\fR, unless these are \fB\s-1NULL\s0\fR.
+.PP
+A callback function may be used to provide feedback about the progress
+of the key generation. If \fBcallback\fR is not \fB\s-1NULL\s0\fR, it will be
+called as follows:
+.Ip "\(bu" 4
+When a candidate for q is generated, \fBcallback(0, m++, cb_arg)\fR is called
+(m is 0 for the first candidate).
+.Ip "\(bu" 4
+When a candidate for q has passed a test by trial division,
+\&\fBcallback(1, \-1, cb_arg)\fR is called.
+While a candidate for q is tested by Miller-Rabin primality tests,
+\&\fBcallback(1, i, cb_arg)\fR 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).
+.Ip "\(bu" 4
+When a prime q has been found, \fBcallback(2, 0, cb_arg)\fR and
+\&\fBcallback(3, 0, cb_arg)\fR are called.
+.Ip "\(bu" 4
+Before a candidate for p (other than the first) is generated and tested,
+\&\fBcallback(0, counter, cb_arg)\fR is called.
+.Ip "\(bu" 4
+When a candidate for p has passed the test by trial division,
+\&\fBcallback(1, \-1, cb_arg)\fR is called.
+While it is tested by the Miller-Rabin primality test,
+\&\fBcallback(1, i, cb_arg)\fR 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).
+.Ip "\(bu" 4
+When p has been found, \fBcallback(2, 1, cb_arg)\fR is called.
+.Ip "\(bu" 4
+When the generator has been found, \fBcallback(3, 1, cb_arg)\fR is called.
+.SH "RETURN VALUE"
+.IX Header "RETURN VALUE"
+\&\fIDSA_generate_parameters()\fR returns a pointer to the \s-1DSA\s0 structure, or
+\&\fB\s-1NULL\s0\fR if the parameter generation fails. The error codes can be
+obtained by ERR_get_error(3).
+.SH "BUGS"
+.IX Header "BUGS"
+Seed lengths > 20 are not supported.
+.SH "SEE ALSO"
+.IX Header "SEE ALSO"
+dsa(3), err(3), rand(3),
+DSA_free(3)
+.SH "HISTORY"
+.IX Header "HISTORY"
+\&\fIDSA_generate_parameters()\fR appeared in SSLeay 0.8. The \fBcb_arg\fR
+argument was added in SSLeay 0.9.0.
+In versions up to OpenSSL 0.9.4, \fBcallback(1, ...)\fR was called
+in the inner loop of the Miller-Rabin test whenever it reached the
+squaring step (the parameters to \fBcallback\fR did not reveal how many
+witnesses had been tested); since OpenSSL 0.9.5, \fBcallback(1, ...)\fR
+is called as in \fIBN_is_prime\fR\|(3), i.e. once for each witness.
+=cut