openssl_dh(3) - NetBSD Manual Pages

Command: Section: Arch: Collection:  
dh(3)                               OpenSSL                              dh(3)




NAME
dh - Diffie-Hellman key agreement
LIBRARY
libcrypto, -lcrypto
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);
DESCRIPTION
These functions implement the Diffie-Hellman key agreement protocol. The generation of shared DH parameters is described in DH_gener- ate_parameters(3); DH_generate_key(3) describes how to perform a key agreement. The 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 DH_METHOD implementations, either directly or by the use of ENGINE modules. In some cases (eg. an ENGINE providing support for hardware-embedded keys), these BIGNUM val- ues will not be used by the implementation or may be used for alterna- tive data storage. For this reason, applications should generally avoid using DH structure elements directly and instead use API functions to query or modify keys.
SEE ALSO
openssl_dhparam(1), openssl_bn(3), openssl_dsa(3), openssl_err(3), openssl_rand(3), openssl_rsa(3), engine(3), DH_set_method(3), DH_new(3), DH_get_ex_new_index(3), DH_generate_parameters(3), DH_com- pute_key(3), d2i_DHparams(3), RSA_print(3) 0.9.9-dev 2003-07-24 dh(3)
Powered by man-cgi 1.15, Panagiotis Christias
Modified for NetBSD by Kimmo Suominen