223 lines
6.4 KiB
Groff
223 lines
6.4 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "dh 3"
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.TH dh 3 "2006-07-29" "0.9.8b" "OpenSSL"
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.SH "NAME"
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dh \- Diffie\-Hellman key agreement
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 2
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\& #include <openssl/dh.h>
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\& #include <openssl/engine.h>
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.Ve
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.PP
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.Vb 2
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\& DH * DH_new(void);
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\& void DH_free(DH *dh);
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.Ve
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.PP
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.Vb 1
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\& int DH_size(const DH *dh);
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.Ve
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.PP
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.Vb 3
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\& DH * DH_generate_parameters(int prime_len, int generator,
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\& void (*callback)(int, int, void *), void *cb_arg);
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\& int DH_check(const DH *dh, int *codes);
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.Ve
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.PP
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.Vb 2
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\& int DH_generate_key(DH *dh);
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\& int DH_compute_key(unsigned char *key, BIGNUM *pub_key, DH *dh);
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.Ve
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.PP
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.Vb 5
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\& void DH_set_default_method(const DH_METHOD *meth);
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\& const DH_METHOD *DH_get_default_method(void);
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\& int DH_set_method(DH *dh, const DH_METHOD *meth);
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\& DH *DH_new_method(ENGINE *engine);
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\& const DH_METHOD *DH_OpenSSL(void);
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.Ve
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.PP
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.Vb 4
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\& int DH_get_ex_new_index(long argl, char *argp, int (*new_func)(),
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\& int (*dup_func)(), void (*free_func)());
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\& int DH_set_ex_data(DH *d, int idx, char *arg);
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\& char *DH_get_ex_data(DH *d, int idx);
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.Ve
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.PP
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.Vb 2
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\& DH * d2i_DHparams(DH **a, unsigned char **pp, long length);
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\& int i2d_DHparams(const DH *a, unsigned char **pp);
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.Ve
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.PP
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.Vb 2
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\& int DHparams_print_fp(FILE *fp, const DH *x);
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\& int DHparams_print(BIO *bp, const DH *x);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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These functions implement the Diffie-Hellman key agreement protocol.
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The generation of shared \s-1DH\s0 parameters is described in
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\&\fIDH_generate_parameters\fR\|(3); \fIDH_generate_key\fR\|(3) describes how
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to perform a key agreement.
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.PP
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The \fB\s-1DH\s0\fR structure consists of several \s-1BIGNUM\s0 components.
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.PP
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.Vb 9
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\& struct
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\& {
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\& BIGNUM *p; // prime number (shared)
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\& BIGNUM *g; // generator of Z_p (shared)
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\& BIGNUM *priv_key; // private DH value x
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\& BIGNUM *pub_key; // public DH value g^x
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\& // ...
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\& };
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\& DH
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.Ve
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.PP
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Note that \s-1DH\s0 keys may use non-standard \fB\s-1DH_METHOD\s0\fR implementations,
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either directly or by the use of \fB\s-1ENGINE\s0\fR modules. In some cases (eg. an
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\&\s-1ENGINE\s0 providing support for hardware-embedded keys), these \s-1BIGNUM\s0 values
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will not be used by the implementation or may be used for alternative data
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storage. For this reason, applications should generally avoid using \s-1DH\s0
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structure elements directly and instead use \s-1API\s0 functions to query or
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modify keys.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIdhparam\fR\|(1), \fIbn\fR\|(3), \fIdsa\fR\|(3), \fIerr\fR\|(3),
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\&\fIrand\fR\|(3), \fIrsa\fR\|(3), \fIengine\fR\|(3),
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\&\fIDH_set_method\fR\|(3), \fIDH_new\fR\|(3),
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\&\fIDH_get_ex_new_index\fR\|(3),
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\&\fIDH_generate_parameters\fR\|(3),
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\&\fIDH_compute_key\fR\|(3), \fId2i_DHparams\fR\|(3),
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\&\fIRSA_print\fR\|(3)
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