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.\" $NetBSD: openssl_dh.3,v 1.1 2001/04/12 10:45:47 itojun Exp $
.\"
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.\" ======================================================================
.\"
.IX Title "dh 3"
.TH dh 3 "0.9.6a" "2000-07-22" "OpenSSL"
.UC
.SH "NAME"
dh \- Diffie-Hellman key agreement
.SH "LIBRARY"
libcrypto, -lcrypto
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/dh.h>
.Ve
.Vb 2
\& DH * DH_new(void);
\& void DH_free(DH *dh);
.Ve
.Vb 1
\& int DH_size(DH *dh);
.Ve
.Vb 3
\& DH * DH_generate_parameters(int prime_len, int generator,
\& void (*callback)(int, int, void *), void *cb_arg);
\& int DH_check(DH *dh, int *codes);
.Ve
.Vb 2
\& int DH_generate_key(DH *dh);
\& int DH_compute_key(unsigned char *key, BIGNUM *pub_key, DH *dh);
.Ve
.Vb 5
\& void DH_set_default_method(DH_METHOD *meth);
\& DH_METHOD *DH_get_default_method(void);
\& DH_METHOD *DH_set_method(DH *dh, DH_METHOD *meth);
\& DH *DH_new_method(DH_METHOD *meth);
\& DH_METHOD *DH_OpenSSL(void);
.Ve
.Vb 4
\& 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);
.Ve
.Vb 2
\& DH * d2i_DHparams(DH **a, unsigned char **pp, long length);
\& int i2d_DHparams(DH *a, unsigned char **pp);
.Ve
.Vb 2
\& int DHparams_print_fp(FILE *fp, DH *x);
\& int DHparams_print(BIO *bp, 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
DH_generate_parameters(3); DH_generate_key(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
.SH "SEE ALSO"
.IX Header "SEE ALSO"
openssl_dhparam(1), openssl_bn(3), openssl_dsa(3), openssl_err(3),
openssl_rand(3), openssl_rsa(3), DH_set_method(3),
DH_new(3), DH_get_ex_new_index(3),
DH_generate_parameters(3),
DH_compute_key(3), d2i_DHparams(3),
RSA_print(3)
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