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+.\" ======================================================================
+.\"
+.IX Title "DSA_SET_METHOD 1"
+.TH DSA_SET_METHOD 1 "perl v5.6.1" "2000-11-13" "User Contributed Perl Documentation"
+.UC
+.SH "NAME"
+DSA_set_default_method, DSA_get_default_method, DSA_set_method,
+DSA_new_method, DSA_OpenSSL \- select \s-1DSA\s0 method
+.SH "SYNOPSIS"
+.IX Header "SYNOPSIS"
+.Vb 1
+\& #include <openssl/dsa.h>
+.Ve
+.Vb 1
+\& void DSA_set_default_method(DSA_METHOD *meth);
+.Ve
+.Vb 1
+\& DSA_METHOD *DSA_get_default_method(void);
+.Ve
+.Vb 1
+\& DSA_METHOD *DSA_set_method(DSA *dsa, DSA_METHOD *meth);
+.Ve
+.Vb 1
+\& DSA *DSA_new_method(DSA_METHOD *meth);
+.Ve
+.Vb 1
+\& DSA_METHOD *DSA_OpenSSL(void);
+.Ve
+.SH "DESCRIPTION"
+.IX Header "DESCRIPTION"
+A \fB\s-1DSA_METHOD\s0\fR specifies the functions that OpenSSL uses for \s-1DSA\s0
+operations. By modifying the method, alternative implementations
+such as hardware accelerators may be used.
+.PP
+Initially, the default is to use the OpenSSL internal implementation.
+\&\fIDSA_OpenSSL()\fR returns a pointer to that method.
+.PP
+\&\fIDSA_set_default_method()\fR makes \fBmeth\fR the default method for all \fB\s-1DSA\s0\fR
+structures created later.
+.PP
+\&\fIDSA_get_default_method()\fR returns a pointer to the current default
+method.
+.PP
+\&\fIDSA_set_method()\fR selects \fBmeth\fR for all operations using the structure \fBdsa\fR.
+.PP
+\&\fIDSA_new_method()\fR allocates and initializes a \fB\s-1DSA\s0\fR structure so that
+\&\fBmethod\fR will be used for the \s-1DSA\s0 operations. If \fBmethod\fR is \fB\s-1NULL\s0\fR,
+the default method is used.
+.SH "THE DSA_METHOD STRUCTURE"
+.IX Header "THE DSA_METHOD STRUCTURE"
+struct
+ {
+     /* name of the implementation */
+        const char *name;
+.PP
+.Vb 3
+\&     /* sign */
+\&        DSA_SIG *(*dsa_do_sign)(const unsigned char *dgst, int dlen,
+\&                                 DSA *dsa);
+.Ve
+.Vb 3
+\&     /* pre-compute k^-1 and r */
+\&        int (*dsa_sign_setup)(DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp,
+\&                                 BIGNUM **rp);
+.Ve
+.Vb 3
+\&     /* verify */
+\&        int (*dsa_do_verify)(const unsigned char *dgst, int dgst_len,
+\&                                 DSA_SIG *sig, DSA *dsa);
+.Ve
+.Vb 5
+\&     /* compute rr = a1^p1 * a2^p2 mod m (May be NULL for some
+\&                                          implementations) */
+\&        int (*dsa_mod_exp)(DSA *dsa, BIGNUM *rr, BIGNUM *a1, BIGNUM *p1,
+\&                                 BIGNUM *a2, BIGNUM *p2, BIGNUM *m,
+\&                                 BN_CTX *ctx, BN_MONT_CTX *in_mont);
+.Ve
+.Vb 4
+\&     /* compute r = a ^ p mod m (May be NULL for some implementations) */
+\&        int (*bn_mod_exp)(DSA *dsa, BIGNUM *r, BIGNUM *a,
+\&                                 const BIGNUM *p, const BIGNUM *m,
+\&                                 BN_CTX *ctx, BN_MONT_CTX *m_ctx);
+.Ve
+.Vb 2
+\&     /* called at DSA_new */
+\&        int (*init)(DSA *DSA);
+.Ve
+.Vb 2
+\&     /* called at DSA_free */
+\&        int (*finish)(DSA *DSA);
+.Ve
+.Vb 1
+\&        int flags;
+.Ve
+.Vb 1
+\&        char *app_data; /* ?? */
+.Ve
+.Vb 1
+\& } DSA_METHOD;
+.Ve
+.SH "RETURN VALUES"
+.IX Header "RETURN VALUES"
+\&\fIDSA_OpenSSL()\fR and \fIDSA_get_default_method()\fR return pointers to the
+respective \fB\s-1DSA_METHOD\s0\fRs.
+.PP
+\&\fIDSA_set_default_method()\fR returns no value.
+.PP
+\&\fIDSA_set_method()\fR returns a pointer to the \fB\s-1DSA_METHOD\s0\fR previously
+associated with \fBdsa\fR.
+.PP
+\&\fIDSA_new_method()\fR returns \fB\s-1NULL\s0\fR and sets an error code that can be
+obtained by ERR_get_error(3) if the allocation
+fails. Otherwise it returns a pointer to the newly allocated
+structure.
+.SH "SEE ALSO"
+.IX Header "SEE ALSO"
+dsa(3), DSA_new(3)
+.SH "HISTORY"
+.IX Header "HISTORY"
+\&\fIDSA_set_default_method()\fR, \fIDSA_get_default_method()\fR, \fIDSA_set_method()\fR,
+\&\fIDSA_new_method()\fR and \fIDSA_OpenSSL()\fR were added in OpenSSL 0.9.4.