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-.\" ========================================================================
-.\"
-.IX Title "dh 3"
-.TH dh 3 "2018-08-14" "1.0.2p" "OpenSSL"
-.\" For nroff, turn off justification. Always turn off hyphenation; it makes
-.\" way too many mistakes in technical documents.
-.if n .ad l
-.nh
-.SH "NAME"
-dh \- Diffie\-Hellman key agreement
-.SH "SYNOPSIS"
-.IX Header "SYNOPSIS"
-.Vb 2
-\& #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);
-.Ve
-.SH "DESCRIPTION"
-.IX Header "DESCRIPTION"
-These functions implement the Diffie-Hellman key agreement protocol.
-The generation of shared \s-1DH\s0 parameters is described in
-\&\fIDH_generate_parameters\fR\|(3); \fIDH_generate_key\fR\|(3) describes how
-to perform a key agreement.
-.PP
-The \fB\s-1DH\s0\fR structure consists of several \s-1BIGNUM\s0 components.
-.PP
-.Vb 9
-\& 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
-.Ve
-.PP
-Note that \s-1DH\s0 keys may use non-standard \fB\s-1DH_METHOD\s0\fR implementations,
-either directly or by the use of \fB\s-1ENGINE\s0\fR modules. In some cases (eg. an
-\&\s-1ENGINE\s0 providing support for hardware-embedded keys), these \s-1BIGNUM\s0 values
-will not be used by the implementation or may be used for alternative data
-storage. For this reason, applications should generally avoid using \s-1DH\s0
-structure elements directly and instead use \s-1API\s0 functions to query or
-modify keys.
-.SH "SEE ALSO"
-.IX Header "SEE ALSO"
-\&\fIdhparam\fR\|(1), \fIbn\fR\|(3), \fIdsa\fR\|(3), \fIerr\fR\|(3),
-\&\fIrand\fR\|(3), \fIrsa\fR\|(3), \fIengine\fR\|(3),
-\&\fIDH_set_method\fR\|(3), \fIDH_new\fR\|(3),
-\&\fIDH_get_ex_new_index\fR\|(3),
-\&\fIDH_generate_parameters\fR\|(3),
-\&\fIDH_compute_key\fR\|(3), \fId2i_DHparams\fR\|(3),
-\&\fIRSA_print\fR\|(3)
generated by cgit v1.2.3 (git 2.25.1) at 2025-08-01 22:54:56 +0000