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Edit File : DSA_generate_parameters_ex.3ssl \| Size : 8.08 KB
.\" Automatically generated by Pod::Man 4.11 (Pod::Simple 3.35) .\" .\" Standard preamble: .\" ======================================================================== .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" Set up some character translations and predefined strings. \(-- will .\" give an unbreakable dash, \(PI will give pi, \(L" will give a left .\" double quote, and \(R" will give a right double quote. \(C+ will .\" give a nicer C++. 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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" DSA_generate_parameters_ex, DSA_generate_parameters \- generate DSA parameters .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #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); .Ve .PP Deprecated: .PP .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" \&\fBDSA_generate_parameters_ex()\fR generates primes p and q and a generator g for use in the \s-1DSA\s0 and stores the result in \fBdsa\fR. .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. .PP \&\fBDSA_generate_parameters_ex()\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 \fBcb\fR is not \fB\s-1NULL\s0\fR, it will be called as shown below. For information on the \s-1BN_GENCB\s0 structure and the BN_GENCB_call function discussed below, refer to \&\fBBN_generate_prime\fR\\|(3). .IP "\(bu" 4 When a candidate for q is generated, \fBBN_GENCB_call(cb, 0, m++)\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, \&\fBBN_GENCB_call(cb, 1, \-1)\fR is called. While a candidate for q is tested by Miller-Rabin primality tests, \&\fBBN_GENCB_call(cb, 1, i)\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, \fBBN_GENCB_call(cb, 2, 0)\fR and \&\fBBN_GENCB_call(cb, 3, 0)\fR are called. .IP "\(bu" 4 Before a candidate for p (other than the first) is generated and tested, \&\fBBN_GENCB_call(cb, 0, counter)\fR is called. .IP "\(bu" 4 When a candidate for p has passed the test by trial division, \&\fBBN_GENCB_call(cb, 1, \-1)\fR is called. While it is tested by the Miller-Rabin primality test, \&\fBBN_GENCB_call(cb, 1, i)\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, \fBBN_GENCB_call(cb, 2, 1)\fR is called. .IP "\(bu" 4 When the generator has been found, \fBBN_GENCB_call(cb, 3, 1)\fR is called. .PP \&\fBDSA_generate_parameters()\fR (deprecated) works in much the same way as for DSA_generate_parameters_ex, except that no \fBdsa\fR parameter is passed and instead a newly allocated \fB\s-1DSA\s0\fR structure is returned. Additionally \(L"old style\*(R" callbacks are used instead of the newer \s-1BN_GENCB\s0 based approach. Refer to \fBBN_generate_prime\fR\\|(3) for further information. .SH "RETURN VALUE" .IX Header "RETURN VALUE" \&\fBDSA_generate_parameters_ex()\fR returns a 1 on success, or 0 otherwise. .PP \&\fBDSA_generate_parameters()\fR returns a pointer to the \s-1DSA\s0 structure, or \&\fB\s-1NULL\s0\fR if the parameter generation fails. .PP The error codes can be obtained by \fBERR_get_error\fR\\|(3). .SH "BUGS" .IX Header "BUGS" Seed lengths > 20 are not supported. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBdsa\fR\\|(3), \fBERR_get_error\fR\\|(3), \fBrand\fR\\|(3), \&\fBDSA_free\fR\\|(3), \fBBN_generate_prime\fR\\|(3) .SH "HISTORY" .IX Header "HISTORY" \&\fBDSA_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 \fBBN_is_prime\fR\\|(3), i.e. once for each witness. Back

Edit File : DSA_generate_parameters_ex.3ssl | Size : 8.08 KB

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.\" ========================================================================
.\"
.IX Title "DSA_generate_parameters 3"
.TH DSA_generate_parameters 3 "2019-12-20" "1.0.2u" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
DSA_generate_parameters_ex, DSA_generate_parameters \- generate DSA parameters
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #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);
.Ve
.PP
Deprecated:
.PP
.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"
\&\fBDSA_generate_parameters_ex()\fR generates primes p and q and a generator g
for use in the \s-1DSA\s0 and stores the result in \fBdsa\fR.
.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.
.PP
\&\fBDSA_generate_parameters_ex()\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 \fBcb\fR is not \fB\s-1NULL\s0\fR, it will be
called as shown below. For information on the \s-1BN_GENCB\s0 structure and the
BN_GENCB_call function discussed below, refer to
\&\fBBN_generate_prime\fR\|(3).
.IP "\(bu" 4
When a candidate for q is generated, \fBBN_GENCB_call(cb, 0, m++)\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,
\&\fBBN_GENCB_call(cb, 1, \-1)\fR is called.
While a candidate for q is tested by Miller-Rabin primality tests,
\&\fBBN_GENCB_call(cb, 1, i)\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, \fBBN_GENCB_call(cb, 2, 0)\fR and
\&\fBBN_GENCB_call(cb, 3, 0)\fR are called.
.IP "\(bu" 4
Before a candidate for p (other than the first) is generated and tested,
\&\fBBN_GENCB_call(cb, 0, counter)\fR is called.
.IP "\(bu" 4
When a candidate for p has passed the test by trial division,
\&\fBBN_GENCB_call(cb, 1, \-1)\fR is called.
While it is tested by the Miller-Rabin primality test,
\&\fBBN_GENCB_call(cb, 1, i)\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, \fBBN_GENCB_call(cb, 2, 1)\fR is called.
.IP "\(bu" 4
When the generator has been found, \fBBN_GENCB_call(cb, 3, 1)\fR is called.
.PP
\&\fBDSA_generate_parameters()\fR (deprecated) works in much the same way as for DSA_generate_parameters_ex, except that no \fBdsa\fR parameter is passed and
instead a newly allocated \fB\s-1DSA\s0\fR structure is returned. Additionally \*(L"old
style\*(R" callbacks are used instead of the newer \s-1BN_GENCB\s0 based approach.
Refer to \fBBN_generate_prime\fR\|(3) for further information.
.SH "RETURN VALUE"
.IX Header "RETURN VALUE"
\&\fBDSA_generate_parameters_ex()\fR returns a 1 on success, or 0 otherwise.
.PP
\&\fBDSA_generate_parameters()\fR returns a pointer to the \s-1DSA\s0 structure, or
\&\fB\s-1NULL\s0\fR if the parameter generation fails.
.PP
The error codes can be obtained by \fBERR_get_error\fR\|(3).
.SH "BUGS"
.IX Header "BUGS"
Seed lengths > 20 are not supported.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBdsa\fR\|(3), \fBERR_get_error\fR\|(3), \fBrand\fR\|(3),
\&\fBDSA_free\fR\|(3), \fBBN_generate_prime\fR\|(3)
.SH "HISTORY"
.IX Header "HISTORY"
\&\fBDSA_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 \fBBN_is_prime\fR\|(3), i.e. once for each witness.

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