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Manpages DSA_generate_parametersSection: OpenSSL (3ssl)Updated: 0.9.6c Index Return to Main Contents NAMEDSA_generate_parameters - generate DSA parametersSYNOPSIS
#include <openssl/dsa.h> 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); DESCRIPTIONDSA_generate_parameters() generates primes p and q and a generator g for use in the DSA.bits is the length of the prime to be generated; the DSS allows a maximum of 1024 bits. If seed is NULL or seed_len < 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 and placed at seed. DSA_generate_parameters() places the iteration count in *counter_ret and a counter used for finding a generator in *h_ret, unless these are NULL.
A callback function may be used to provide feedback about the progress
of the key generation. If callback is not NULL, it will be
called as follows:
RETURN VALUEDSA_generate_parameters() returns a pointer to the DSA structure, or NULL if the parameter generation fails. The error codes can be obtained by ERR_get_error(3).BUGSSeed lengths > 20 are not supported.SEE ALSOdsa(3), err(3), rand(3), DSA_free(3)HISTORYDSA_generate_parameters() appeared in SSLeay 0.8. The cb_arg argument was added in SSLeay 0.9.0. In versions up to OpenSSL 0.9.4, callback(1, ...) was called in the inner loop of the Miller-Rabin test whenever it reached the squaring step (the parameters to callback did not reveal how many witnesses had been tested); since OpenSSL 0.9.5, callback(1, ...) is called as in BN_is_prime(3), i.e. once for each witness. =cut
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