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DSA_generate_parameters_ex.3
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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 5 \& #if OPENSSL_API_COMPAT < 0x00908000L \& 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); \& #endif .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 p to be generated. For lengths under 2048 bits, the length of q is 160 bits; for lengths greater than or equal to 2048 bits, the length of q is set to 256 bits. .PP If \fBseed\fR is \s-1NULL,\s0 the primes will be generated at random. If \fBseed_len\fR is less than the length of q, an error is returned. .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). .PP \&\fBDSA_generate_prime()\fR is similar to \fBDSA_generate_prime_ex()\fR but expects an old-style callback function; see \&\fBBN_generate_prime\fR\|(3) for information on the old-style callback. .IP "\(bu" 2 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" 2 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" 2 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" 2 Before a candidate for p (other than the first) is generated and tested, \&\fBBN_GENCB_call(cb, 0, counter)\fR is called. .IP "\(bu" 2 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" 2 When p has been found, \fBBN_GENCB_call(cb, 2, 1)\fR is called. .IP "\(bu" 2 When the generator has been found, \fBBN_GENCB_call(cb, 3, 1)\fR is called. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBDSA_generate_parameters_ex()\fR returns a 1 on success, or 0 otherwise. The error codes can be obtained by \fBERR_get_error\fR\|(3). .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. .SH "BUGS" .IX Header "BUGS" Seed lengths greater than 20 are not supported. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBDSA_new\fR\|(3), \fBERR_get_error\fR\|(3), \fBRAND_bytes\fR\|(3), \&\fBDSA_free\fR\|(3), \fBBN_generate_prime\fR\|(3) .SH "HISTORY" .IX Header "HISTORY" \&\fBDSA_generate_parameters()\fR was deprecated in OpenSSL 0.9.8; use \&\fBDSA_generate_parameters_ex()\fR instead. .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2000\-2018 The OpenSSL Project Authors. All Rights Reserved. .PP Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.
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