• NAME
• SYNOPSIS
• DESCRIPTION
• RETURN VALUES
• BUGS
• SEE ALSO
• HISTORY
• COPYRIGHT

NAME

DSA_generate_parameters_ex, DSA_generate_parameters - generate DSA parameters

SYNOPSIS

 #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);

Deprecated since OpenSSL 0.9.8, can be hidden entirely by defining OPENSSL_API_COMPAT with a suitable version value, see 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);

DESCRIPTION

A callback function may be used to provide feedback about the progress of the key generation. If cb is not NULL, it will be called as shown below. For information on the BN_GENCB structure and the BN_GENCB_call function discussed below, refer to BN_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, BN_GENCB_call(cb, 1, -1) is called. While a candidate for q is tested by Miller-Rabin primality tests, BN_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 BN_GENCB_call(cb, 3, 0) are called.

• Before a candidate for p (other than the first) is generated and tested, BN_GENCB_call(cb, 0, counter) is called.

• When a candidate for p has passed the test by trial division, BN_GENCB_call(cb, 1, -1) is called. While it is tested by the Miller-Rabin primality test, BN_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.

RETURN VALUES

DSA_generate_parameters_ex() returns a 1 on success, or 0 otherwise. The error codes can be obtained by BUGS

Seed lengths greater than 20 are not supported.

ERR_get_error(3), DSA_free(3), HISTORY

DSA_generate_parameters() was deprecated in OpenSSL 0.9.8; use DSA_generate_parameters_ex() instead.

Licensed under the Apache License 2.0 (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at https://www.openssl.org/source/license.html.