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author | marha <marha@users.sourceforge.net> | 2009-06-28 22:07:26 +0000 |
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committer | marha <marha@users.sourceforge.net> | 2009-06-28 22:07:26 +0000 |
commit | 3562e78743202e43aec8727005182a2558117eca (patch) | |
tree | 8f9113a77d12470c5c851a2a8e4cb02e89df7d43 /openssl/doc/crypto/DH_generate_parameters.pod | |
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Diffstat (limited to 'openssl/doc/crypto/DH_generate_parameters.pod')
-rw-r--r-- | openssl/doc/crypto/DH_generate_parameters.pod | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/openssl/doc/crypto/DH_generate_parameters.pod b/openssl/doc/crypto/DH_generate_parameters.pod new file mode 100644 index 000000000..9081e9ea7 --- /dev/null +++ b/openssl/doc/crypto/DH_generate_parameters.pod @@ -0,0 +1,73 @@ +=pod + +=head1 NAME + +DH_generate_parameters, DH_check - generate and check Diffie-Hellman parameters + +=head1 SYNOPSIS + + #include <openssl/dh.h> + + DH *DH_generate_parameters(int prime_len, int generator, + void (*callback)(int, int, void *), void *cb_arg); + + int DH_check(DH *dh, int *codes); + +=head1 DESCRIPTION + +DH_generate_parameters() generates Diffie-Hellman parameters that can +be shared among a group of users, and returns them in a newly +allocated B<DH> structure. The pseudo-random number generator must be +seeded prior to calling DH_generate_parameters(). + +B<prime_len> is the length in bits of the safe prime to be generated. +B<generator> is a small number E<gt> 1, typically 2 or 5. + +A callback function may be used to provide feedback about the progress +of the key generation. If B<callback> is not B<NULL>, it will be +called as described in L<BN_generate_prime(3)|BN_generate_prime(3)> while a random prime +number is generated, and when a prime has been found, B<callback(3, +0, cb_arg)> is called. + +DH_check() validates Diffie-Hellman parameters. It checks that B<p> is +a safe prime, and that B<g> is a suitable generator. In the case of an +error, the bit flags DH_CHECK_P_NOT_SAFE_PRIME or +DH_NOT_SUITABLE_GENERATOR are set in B<*codes>. +DH_UNABLE_TO_CHECK_GENERATOR is set if the generator cannot be +checked, i.e. it does not equal 2 or 5. + +=head1 RETURN VALUES + +DH_generate_parameters() returns a pointer to the DH structure, or +NULL if the parameter generation fails. The error codes can be +obtained by L<ERR_get_error(3)|ERR_get_error(3)>. + +DH_check() returns 1 if the check could be performed, 0 otherwise. + +=head1 NOTES + +DH_generate_parameters() may run for several hours before finding a +suitable prime. + +The parameters generated by DH_generate_parameters() are not to be +used in signature schemes. + +=head1 BUGS + +If B<generator> is not 2 or 5, B<dh-E<gt>g>=B<generator> is not +a usable generator. + +=head1 SEE ALSO + +L<dh(3)|dh(3)>, L<ERR_get_error(3)|ERR_get_error(3)>, L<rand(3)|rand(3)>, +L<DH_free(3)|DH_free(3)> + +=head1 HISTORY + +DH_check() is available in all versions of SSLeay and OpenSSL. +The B<cb_arg> argument to DH_generate_parameters() was added in SSLeay 0.9.0. + +In versions before OpenSSL 0.9.5, DH_CHECK_P_NOT_STRONG_PRIME is used +instead of DH_CHECK_P_NOT_SAFE_PRIME. + +=cut |