forked from cory/tildefriends
Cory McWilliams
09ddfffa6b
git-svn-id: https://www.unprompted.com/svn/projects/tildefriends/trunk@4088 ed5197a5-7fde-0310-b194-c3ffbd925b24
241 lines
8.1 KiB
Groff
241 lines
8.1 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "DSA_GENERATE_PARAMETERS 3"
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.TH DSA_GENERATE_PARAMETERS 3 "2020-04-21" "1.1.1g" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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DSA_generate_parameters_ex, DSA_generate_parameters \- generate DSA parameters
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/dsa.h>
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\&
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\& int DSA_generate_parameters_ex(DSA *dsa, int bits,
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\& const unsigned char *seed, int seed_len,
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\& int *counter_ret, unsigned long *h_ret,
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\& BN_GENCB *cb);
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.Ve
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.PP
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Deprecated:
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.PP
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.Vb 5
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\& #if OPENSSL_API_COMPAT < 0x00908000L
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\& DSA *DSA_generate_parameters(int bits, unsigned char *seed, int seed_len,
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\& int *counter_ret, unsigned long *h_ret,
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\& void (*callback)(int, int, void *), void *cb_arg);
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\& #endif
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fBDSA_generate_parameters_ex()\fR generates primes p and q and a generator g
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for use in the \s-1DSA\s0 and stores the result in \fBdsa\fR.
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.PP
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\&\fBbits\fR is the length of the prime p to be generated.
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For lengths under 2048 bits, the length of q is 160 bits; for lengths
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greater than or equal to 2048 bits, the length of q is set to 256 bits.
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.PP
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If \fBseed\fR is \s-1NULL,\s0 the primes will be generated at random.
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If \fBseed_len\fR is less than the length of q, an error is returned.
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.PP
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\&\fBDSA_generate_parameters_ex()\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 \fB\s-1NULL\s0\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 \fBcb\fR is not \fB\s-1NULL\s0\fR, it will be
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called as shown below. For information on the \s-1BN_GENCB\s0 structure and the
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BN_GENCB_call function discussed below, refer to
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\&\fBBN_generate_prime\fR\|(3).
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.PP
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\&\fBDSA_generate_prime()\fR is similar to \fBDSA_generate_prime_ex()\fR but
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expects an old-style callback function; see
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\&\fBBN_generate_prime\fR\|(3) for information on the old-style callback.
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.IP "\(bu" 2
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When a candidate for q is generated, \fBBN_GENCB_call(cb, 0, m++)\fR is called
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(m is 0 for the first candidate).
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.IP "\(bu" 2
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When a candidate for q has passed a test by trial division,
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\&\fBBN_GENCB_call(cb, 1, \-1)\fR is called.
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While a candidate for q is tested by Miller-Rabin primality tests,
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\&\fBBN_GENCB_call(cb, 1, i)\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" 2
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When a prime q has been found, \fBBN_GENCB_call(cb, 2, 0)\fR and
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\&\fBBN_GENCB_call(cb, 3, 0)\fR are called.
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.IP "\(bu" 2
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Before a candidate for p (other than the first) is generated and tested,
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\&\fBBN_GENCB_call(cb, 0, counter)\fR is called.
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.IP "\(bu" 2
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When a candidate for p has passed the test by trial division,
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\&\fBBN_GENCB_call(cb, 1, \-1)\fR is called.
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While it is tested by the Miller-Rabin primality test,
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\&\fBBN_GENCB_call(cb, 1, i)\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" 2
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When p has been found, \fBBN_GENCB_call(cb, 2, 1)\fR is called.
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.IP "\(bu" 2
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When the generator has been found, \fBBN_GENCB_call(cb, 3, 1)\fR is called.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fBDSA_generate_parameters_ex()\fR returns a 1 on success, or 0 otherwise.
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The error codes can be obtained by \fBERR_get_error\fR\|(3).
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.PP
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\&\fBDSA_generate_parameters()\fR returns a pointer to the \s-1DSA\s0 structure or
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\&\fB\s-1NULL\s0\fR if the parameter generation fails.
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.SH "BUGS"
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.IX Header "BUGS"
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Seed lengths greater than 20 are not supported.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fBDSA_new\fR\|(3), \fBERR_get_error\fR\|(3), \fBRAND_bytes\fR\|(3),
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\&\fBDSA_free\fR\|(3), \fBBN_generate_prime\fR\|(3)
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.SH "HISTORY"
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.IX Header "HISTORY"
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\&\fBDSA_generate_parameters()\fR was deprecated in OpenSSL 0.9.8; use
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\&\fBDSA_generate_parameters_ex()\fR instead.
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.SH "COPYRIGHT"
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.IX Header "COPYRIGHT"
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Copyright 2000\-2018 The OpenSSL Project Authors. All Rights Reserved.
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.PP
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Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file \s-1LICENSE\s0 in the source distribution or at
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<https://www.openssl.org/source/license.html>.
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