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Title "DSA_GENERATE_PARAMETERS 3" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
DSA_generate_parameters_ex, DSA_generate_parameters - generate DSA parameters Header "SYNOPSIS" .Vb 1 #include <openssl/dsa.h> .Ve

The following functions have been deprecated since OpenSSL 3.0, and can be hidden entirely by defining \s-1OPENSSL_API_COMPAT\s0 with a suitable version value, see openssl_user_macros\|(7):

.Vb 4 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

The following functions have been deprecated since OpenSSL 0.9.8, and can be hidden entirely by defining \s-1OPENSSL_API_COMPAT\s0 with a suitable version value, see openssl_user_macros\|(7):

.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

Header "DESCRIPTION" All of the functions described on this page are deprecated. Applications should instead use EVP_PKEY_paramgen_init\|(3) and \fBEVP_PKEY_keygen\|(3) as described in \s-1EVP_PKEY-DSA\s0\|(7).

\fBDSA_generate_parameters_ex() generates primes p and q and a generator g for use in the \s-1DSA\s0 and stores the result in dsa.

\fBbits 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.

If seed is \s-1NULL,\s0 the primes will be generated at random. If seed_len is less than the length of q, an error is returned.

\fBDSA_generate_parameters_ex() places the iteration count in *counter_ret and a counter used for finding a generator in *h_ret, unless these are \s-1NULL\s0.

A callback function may be used to provide feedback about the progress of the key generation. If cb is not \s-1NULL\s0, 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\|(3).

\fBDSA_generate_prime() is similar to DSA_generate_prime_ex() but expects an old-style callback function; see \fBBN_generate_prime\|(3) for information on the old-style callback.

When a candidate for q is generated, BN_GENCB_call(cb, 0, m++) is called (m is 0 for the first candidate). When a candidate for q has passed a test by trial division, \fBBN_GENCB_call(cb, 1, -1) is called. While a candidate for q is tested by Miller-Rabin primality tests, \fBBN_GENCB_call(cb, 1, i) 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). When a prime q has been found, BN_GENCB_call(cb, 2, 0) and \fBBN_GENCB_call(cb, 3, 0) are called. Before a candidate for p (other than the first) is generated and tested, \fBBN_GENCB_call(cb, 0, counter) is called. When a candidate for p has passed the test by trial division, \fBBN_GENCB_call(cb, 1, -1) is called. While it is tested by the Miller-Rabin primality test, \fBBN_GENCB_call(cb, 1, i) 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). When p has been found, BN_GENCB_call(cb, 2, 1) is called. When the generator has been found, BN_GENCB_call(cb, 3, 1) is called. Header "RETURN VALUES" \fBDSA_generate_parameters_ex() returns a 1 on success, or 0 otherwise. The error codes can be obtained by ERR_get_error\|(3).

\fBDSA_generate_parameters() returns a pointer to the \s-1DSA\s0 structure or \fB\s-1NULL\s0 if the parameter generation fails.

Header "BUGS" Seed lengths greater than 20 are not supported. Header "SEE ALSO" \fBDSA_new\|(3), ERR_get_error\|(3), RAND_bytes\|(3), \fBDSA_free\|(3), BN_generate_prime\|(3) Header "HISTORY" \fBDSA_generate_parameters_ex() was deprecated in OpenSSL 3.0.

\fBDSA_generate_parameters() was deprecated in OpenSSL 0.9.8; use \fBDSA_generate_parameters_ex() instead.

Header "COPYRIGHT" Copyright 2000-2021 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the Apache License 2.0 (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>.