DH_GENERATE_PARAMETERS - Online Linux Manual PageSection : 3
Updated : 2021-03-26
Source : 1.1.1k
Note : OpenSSL
NAMEDH_generate_parameters_ex, DH_generate_parameters, DH_check, DH_check_params, DH_check_ex, DH_check_params_ex, DH_check_pub_key_ex ​− generate and check Diffie−Hellman parameters
SYNOPSIS​ #include <openssl/dh.h> ​ ​ int DH_generate_parameters_ex(DH *dh, int prime_len, int generator, BN_GENCB *cb); ​ ​ int DH_check(DH *dh, int *codes); ​ int DH_check_params(DH *dh, int *codes); ​ ​ int DH_check_ex(const DH *dh); ​ int DH_check_params_ex(const DH *dh); ​ int DH_check_pub_key_ex(const DH *dh, const BIGNUM *pub_key); Deprecated: ​ #if OPENSSL_API_COMPAT < 0x00908000L ​ DH *DH_generate_parameters(int prime_len, int generator, ​ void (*callback)(int, int, void *), void *cb_arg); ​ #endif
DESCRIPTION​DH_generate_parameters_ex() generates Diffie-Hellman parameters that can be shared among a group of users, and stores them in the provided DH structure. The pseudo-random number generator must be seeded before calling it. The parameters generated by DH_generate_parameters_ex() should not be used in signature schemes. ​prime_len is the length in bits of the safe prime to be generated. ​generator is a small number > 1, typically 2 or 5. 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 described in BN_generate_prime (3) while a random prime number is generated, and when a prime has been found, BN_GENCB_call(cb, 3, 0) is called. See BN_generate_prime_ex (3) for information on the BN_GENCB_call() function. ​DH_generate_parameters() is similar to DH_generate_prime_ex() but expects an old-style callback function; see ​BN_generate_prime (3) for information on the old-style callback. ​DH_check_params() confirms that the p and g are likely enough to be valid. This is a lightweight check, if a more thorough check is needed, use ​DH_check(). The value of *codes is updated with any problems found. If *codes is zero then no problems were found, otherwise the following bits may be set: DH_CHECK_P_NOT_PRIME The parameter p has been determined to not being an odd prime. Note that the lack of this bit doesn't guarantee that p is a prime. DH_NOT_SUITABLE_GENERATOR The generator g is not suitable. Note that the lack of this bit doesn't guarantee that g is suitable, unless p is known to be a strong prime. ​DH_check() confirms that the Diffie-Hellman parameters dh are valid. The value of *codes is updated with any problems found. If *codes is zero then no problems were found, otherwise the following bits may be set: DH_CHECK_P_NOT_PRIME The parameter p is not prime. DH_CHECK_P_NOT_SAFE_PRIME The parameter p is not a safe prime and no q value is present. DH_UNABLE_TO_CHECK_GENERATOR The generator g cannot be checked for suitability. DH_NOT_SUITABLE_GENERATOR The generator g is not suitable. DH_CHECK_Q_NOT_PRIME The parameter q is not prime. DH_CHECK_INVALID_Q_VALUE The parameter q is invalid. DH_CHECK_INVALID_J_VALUE The parameter j is invalid. ​DH_check_ex(), DH_check_params() and DH_check_pub_key_ex() are similar to ​DH_check() and DH_check_params() respectively, but the error reasons are added to the thread's error queue instead of provided as return values from the function.
RETURN VALUES​DH_generate_parameters_ex(), DH_check() and DH_check_params() return 1 if the check could be performed, 0 otherwise. ​DH_generate_parameters() returns a pointer to the DH structure or NULL if the parameter generation fails. ​DH_check_ex(), DH_check_params() and DH_check_pub_key_ex() return 1 if the check is successful, 0 for failed. The error codes can be obtained by ERR_get_error (3).
SEE ALSO​DH_new (3), ERR_get_error (3), RAND_bytes (3), ​DH_free (3)
HISTORY​DH_generate_parameters() was deprecated in OpenSSL 0.9.8; use ​DH_generate_parameters_ex() instead.
COPYRIGHTCopyright 2000−2018 The OpenSSL Project Authors. All Rights Reserved. Licensed under the OpenSSL license (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>. 0
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