299 lines
7.5 KiB
Groff
299 lines
7.5 KiB
Groff
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.tr \(*W-|\(bv\*(Tr
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.ie n \{\
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'br\}
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.\" If the F register is turned on, we'll generate
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.\" index entries out stderr for the following things:
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.\" TH Title
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.de IX
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.nr % 0
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.rr F
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.\}
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.TH DSA_generate_parameters 3 "0.9.5a" "22/Jul/100" "OpenSSL"
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.UC
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..
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.\" @(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2
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\{\
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.\}
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.rm #[ #] #H #V #F C
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.SH "NAME"
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DSA_generate_parameters \- generate DSA parameters
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.SH "LIBRARY"
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libcrypto, -lcrypto
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.SH "SYNOPSIS"
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.PP
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.Vb 1
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\& #include <openssl/dsa.h>
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.Ve
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.Vb 3
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\& DSA *DSA_generate_parameters(int bits, unsigned char *seed,
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\& int seed_len, int *counter_ret, unsigned long *h_ret,
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\& void (*callback)(int, int, void *), void *cb_arg);
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.Ve
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.SH "DESCRIPTION"
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\fIDSA_generate_parameters()\fR generates primes p and q and a generator g
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for use in the DSA.
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.PP
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\fBbits\fR is the length of the prime to be generated; the DSS allows a
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maximum of 1024 bits.
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.PP
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If \fBseed\fR is \fBNULL\fR or \fBseed_len\fR < 20, the primes will be
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generated at random. Otherwise, the seed is used to generate
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them. If the given seed does not yield a prime q, a new random
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seed is chosen and placed at \fBseed\fR.
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.PP
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\fIDSA_generate_parameters()\fR places the iteration count in
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*\fBcounter_ret\fR and a counter used for finding a generator in
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*\fBh_ret\fR, unless these are \fBNULL\fR.
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.PP
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A callback function may be used to provide feedback about the progress
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of the key generation. If \fBcallback\fR is not \fBNULL\fR, it will be
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called as follows:
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.Ip "\(bu" 4
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When a candidate for q is generated, \fBcallback(0, m++, cb_arg)\fR is called
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(m is 0 for the first candidate).
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.Ip "\(bu" 4
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When a candidate for q has passed a test by trial division,
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\fBcallback(1, \-1, cb_arg)\fR is called.
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While a candidate for q is tested by Miller-Rabin primality tests,
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\fBcallback(1, i, cb_arg)\fR is called in the outer loop
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(once for each witness that confirms that the candidate may be prime);
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i is the loop counter (starting at 0).
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.Ip "\(bu" 4
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When a prime q has been found, \fBcallback(2, 0, cb_arg)\fR and
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\fBcallback(3, 0, cb_arg)\fR are called.
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.Ip "\(bu" 4
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Before a candidate for p (other than the first) is generated and tested,
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\fBcallback(0, counter, cb_arg)\fR is called.
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.Ip "\(bu" 4
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When a candidate for p has passed the test by trial division,
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\fBcallback(1, \-1, cb_arg)\fR is called.
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While it is tested by the Miller-Rabin primality test,
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\fBcallback(1, i, cb_arg)\fR is called in the outer loop
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(once for each witness that confirms that the candidate may be prime).
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i is the loop counter (starting at 0).
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.Ip "\(bu" 4
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When p has been found, \fBcallback(2, 1, cb_arg)\fR is called.
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.Ip "\(bu" 4
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When the generator has been found, \fBcallback(3, 1, cb_arg)\fR is called.
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.SH "RETURN VALUE"
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\fIDSA_generate_parameters()\fR returns a pointer to the DSA structure, or
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\fBNULL\fR if the parameter generation fails. The error codes can be
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obtained by the \fIERR_get_error(3)|ERR_get_error(3)\fR manpage.
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.SH "BUGS"
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Seed lengths > 20 are not supported.
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.SH "SEE ALSO"
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the \fIdsa(3)|dsa(3)\fR manpage, the \fIerr(3)|err(3)\fR manpage, the \fIrand(3)|rand(3)\fR manpage,
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the \fIDSA_free(3)|DSA_free(3)\fR manpage
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.SH "HISTORY"
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\fIDSA_generate_parameters()\fR appeared in SSLeay 0.8. The \fBcb_arg\fR
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argument was added in SSLeay 0.9.0.
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In versions up to OpenSSL 0.9.4, \fBcallback(1, ...)\fR was called
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in the inner loop of the Miller-Rabin test whenever it reached the
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squaring step (the parameters to \fBcallback\fR did not reveal how many
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witnesses had been tested); since OpenSSL 0.9.5, \fBcallback(1, ...)\fR
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is called as in \fIBN_is_prime\fR\|(3), i.e. once for each witness.
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=cut
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.rn }` ''
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.IX Title "DSA_generate_parameters 3"
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.IX Name "DSA_generate_parameters - generate DSA parameters"
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.IX Header "NAME"
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.IX Header "SYNOPSIS"
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.IX Header "DESCRIPTION"
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.IX Item "\(bu"
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.IX Item "\(bu"
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.IX Item "\(bu"
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.IX Item "\(bu"
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.IX Item "\(bu"
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.IX Item "\(bu"
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.IX Item "\(bu"
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.IX Header "RETURN VALUE"
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.IX Header "BUGS"
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.IX Header "SEE ALSO"
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.IX Header "HISTORY"
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