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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.pod | |
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Diffstat (limited to 'openssl/doc/crypto/dh.pod')
-rw-r--r-- | openssl/doc/crypto/dh.pod | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/openssl/doc/crypto/dh.pod b/openssl/doc/crypto/dh.pod new file mode 100644 index 000000000..c3ccd0620 --- /dev/null +++ b/openssl/doc/crypto/dh.pod @@ -0,0 +1,78 @@ +=pod + +=head1 NAME + +dh - Diffie-Hellman key agreement + +=head1 SYNOPSIS + + #include <openssl/dh.h> + #include <openssl/engine.h> + + DH * DH_new(void); + void DH_free(DH *dh); + + int DH_size(const DH *dh); + + DH * DH_generate_parameters(int prime_len, int generator, + void (*callback)(int, int, void *), void *cb_arg); + int DH_check(const DH *dh, int *codes); + + int DH_generate_key(DH *dh); + int DH_compute_key(unsigned char *key, BIGNUM *pub_key, DH *dh); + + void DH_set_default_method(const DH_METHOD *meth); + const DH_METHOD *DH_get_default_method(void); + int DH_set_method(DH *dh, const DH_METHOD *meth); + DH *DH_new_method(ENGINE *engine); + const DH_METHOD *DH_OpenSSL(void); + + int DH_get_ex_new_index(long argl, char *argp, int (*new_func)(), + int (*dup_func)(), void (*free_func)()); + int DH_set_ex_data(DH *d, int idx, char *arg); + char *DH_get_ex_data(DH *d, int idx); + + DH * d2i_DHparams(DH **a, unsigned char **pp, long length); + int i2d_DHparams(const DH *a, unsigned char **pp); + + int DHparams_print_fp(FILE *fp, const DH *x); + int DHparams_print(BIO *bp, const DH *x); + +=head1 DESCRIPTION + +These functions implement the Diffie-Hellman key agreement protocol. +The generation of shared DH parameters is described in +L<DH_generate_parameters(3)|DH_generate_parameters(3)>; L<DH_generate_key(3)|DH_generate_key(3)> describes how +to perform a key agreement. + +The B<DH> structure consists of several BIGNUM components. + + struct + { + BIGNUM *p; // prime number (shared) + BIGNUM *g; // generator of Z_p (shared) + BIGNUM *priv_key; // private DH value x + BIGNUM *pub_key; // public DH value g^x + // ... + }; + DH + +Note that DH keys may use non-standard B<DH_METHOD> implementations, +either directly or by the use of B<ENGINE> modules. In some cases (eg. an +ENGINE providing support for hardware-embedded keys), these BIGNUM values +will not be used by the implementation or may be used for alternative data +storage. For this reason, applications should generally avoid using DH +structure elements directly and instead use API functions to query or +modify keys. + +=head1 SEE ALSO + +L<dhparam(1)|dhparam(1)>, L<bn(3)|bn(3)>, L<dsa(3)|dsa(3)>, L<err(3)|err(3)>, +L<rand(3)|rand(3)>, L<rsa(3)|rsa(3)>, L<engine(3)|engine(3)>, +L<DH_set_method(3)|DH_set_method(3)>, L<DH_new(3)|DH_new(3)>, +L<DH_get_ex_new_index(3)|DH_get_ex_new_index(3)>, +L<DH_generate_parameters(3)|DH_generate_parameters(3)>, +L<DH_compute_key(3)|DH_compute_key(3)>, L<d2i_DHparams(3)|d2i_DHparams(3)>, +L<RSA_print(3)|RSA_print(3)> + +=cut |