249 lines
6.9 KiB
Groff
249 lines
6.9 KiB
Groff
.\" $NetBSD: DH_set_method.3,v 1.5 2001/04/12 10:45:36 itojun Exp $
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.\" Thu Apr 12 19:26:52 2001
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.\" ======================================================================
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.\"
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.IX Title "DH_set_method 3"
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.TH DH_set_method 3 "0.9.6a" "2001-04-12" "OpenSSL"
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.UC
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.SH "NAME"
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DH_set_default_method, DH_get_default_method, DH_set_method,
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DH_new_method, DH_OpenSSL \- select \s-1DH\s0 method
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.SH "LIBRARY"
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libcrypto, -lcrypto
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/dh.h>
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.Ve
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.Vb 1
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\& void DH_set_default_method(DH_METHOD *meth);
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.Ve
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.Vb 1
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\& DH_METHOD *DH_get_default_method(void);
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.Ve
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.Vb 1
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\& DH_METHOD *DH_set_method(DH *dh, DH_METHOD *meth);
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.Ve
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.Vb 1
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\& DH *DH_new_method(DH_METHOD *meth);
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.Ve
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.Vb 1
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\& DH_METHOD *DH_OpenSSL(void);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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A \fB\s-1DH_METHOD\s0\fR specifies the functions that OpenSSL uses for Diffie-Hellman
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operations. By modifying the method, alternative implementations
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such as hardware accelerators may be used.
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.PP
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Initially, the default is to use the OpenSSL internal implementation.
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\&\fIDH_OpenSSL()\fR returns a pointer to that method.
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.PP
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\&\fIDH_set_default_method()\fR makes \fBmeth\fR the default method for all \fB\s-1DH\s0\fR
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structures created later.
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.PP
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\&\fIDH_get_default_method()\fR returns a pointer to the current default
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method.
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.PP
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\&\fIDH_set_method()\fR selects \fBmeth\fR for all operations using the structure \fBdh\fR.
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.PP
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\&\fIDH_new_method()\fR allocates and initializes a \fB\s-1DH\s0\fR structure so that
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\&\fBmethod\fR will be used for the \s-1DH\s0 operations. If \fBmethod\fR is \fB\s-1NULL\s0\fR,
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the default method is used.
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.SH "THE DH_METHOD STRUCTURE"
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.IX Header "THE DH_METHOD STRUCTURE"
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.Vb 4
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\& typedef struct dh_meth_st
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\& {
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\& /* name of the implementation */
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\& const char *name;
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.Ve
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.Vb 2
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\& /* generate private and public DH values for key agreement */
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\& int (*generate_key)(DH *dh);
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.Ve
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.Vb 2
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\& /* compute shared secret */
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\& int (*compute_key)(unsigned char *key, BIGNUM *pub_key, DH *dh);
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.Ve
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.Vb 4
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\& /* compute r = a ^ p mod m (May be NULL for some implementations) */
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\& int (*bn_mod_exp)(DH *dh, BIGNUM *r, BIGNUM *a, const BIGNUM *p,
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\& const BIGNUM *m, BN_CTX *ctx,
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\& BN_MONT_CTX *m_ctx);
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.Ve
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.Vb 2
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\& /* called at DH_new */
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\& int (*init)(DH *dh);
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.Ve
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.Vb 2
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\& /* called at DH_free */
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\& int (*finish)(DH *dh);
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.Ve
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.Vb 1
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\& int flags;
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.Ve
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.Vb 1
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\& char *app_data; /* ?? */
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.Ve
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.Vb 1
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\& } DH_METHOD;
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.Ve
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fIDH_OpenSSL()\fR and \fIDH_get_default_method()\fR return pointers to the respective
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\&\fB\s-1DH_METHOD\s0\fRs.
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.PP
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\&\fIDH_set_default_method()\fR returns no value.
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.PP
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\&\fIDH_set_method()\fR returns a pointer to the \fB\s-1DH_METHOD\s0\fR previously
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associated with \fBdh\fR.
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.PP
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\&\fIDH_new_method()\fR returns \fB\s-1NULL\s0\fR and sets an error code that can be
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obtained by ERR_get_error(3) if the allocation fails. Otherwise it
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returns a pointer to the newly allocated structure.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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openssl_dh(3), DH_new(3)
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.SH "HISTORY"
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.IX Header "HISTORY"
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\&\fIDH_set_default_method()\fR, \fIDH_get_default_method()\fR, \fIDH_set_method()\fR,
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\&\fIDH_new_method()\fR and \fIDH_OpenSSL()\fR were added in OpenSSL 0.9.4.
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