dh man page on DigitalUNIX

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dh(3)									 dh(3)

       dh - Diffie-Hellman key agreement

       #include <openssl/dh.h> #include <openssl/engine.h>

       DH * DH_new(
	       void ); void DH_free(
	       DH *dh ); int   DH_size(
	       DH *dh ); DH * DH_generate_parameters(
	       int prime_len,
	       int generator,
	       void (*callback)(int, int, void *),
	       void *(cb_arg),
	       int    DH_check (DH *dh, int *codes) ); int   DH_generate_key(
	       DH *dh ); int   DH_compute_key(
	       unsigned char *key,
	       IGNUM *pub_key,
	       DH *dh ); void DH_set_default_openssl_method(
	       DH_METHOD *meth ); DH_METHOD *DH_get_default_openssl_method(
	       void ); int   DH_set_method(
	       DH *dh,
	       ENGINE *engine ); DH *DH_new_method(
	       ENGINE *engine ); 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(
	       DH *a,
	       unsigned char **pp ); int   DHparams_print_fp(
	       FILE *fp,
	       DH *x ); int   DHparams_print(
	       BIO *bp,
	       DH *x );

       These  functions	 implement  the Diffie-Hellman key agreement protocol.
       The generation of  shared  DH  parameters  is  described	 in  DH_gener‐
       ate_parameters(3).   See DH_generate_key(3) for a description of how to
       perform a key agreement.

       The DH structure consists of several BIGNUM components:
	       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
	       // ...

       Commands: dhparam(1)

       Functions:    bn(3),    dsa(3),	  err(3),     rand_ssl(3),     rsa(3),
       DH_set_method(3), DH_new(3), DH_get_ex_new_index(3), DH_generate_param‐
       eters(3), DH_compute_key(3), d2i_DHparams(3), RSA_print(3)


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