From 027351f729b9e837200dae6e1520cda6577ab930 Mon Sep 17 00:00:00 2001 From: cvs2svn Date: Wed, 15 May 2002 02:29:24 +0000 Subject: This commit was manufactured by cvs2git to create branch 'unlabeled-1.1.1'. --- src/lib/libcrypto/doc/DSA_set_method.pod | 111 +++++++++++++++++++++++++++++++ 1 file changed, 111 insertions(+) create mode 100644 src/lib/libcrypto/doc/DSA_set_method.pod (limited to 'src/lib/libcrypto/doc/DSA_set_method.pod') diff --git a/src/lib/libcrypto/doc/DSA_set_method.pod b/src/lib/libcrypto/doc/DSA_set_method.pod new file mode 100644 index 0000000000..0b13ec9237 --- /dev/null +++ b/src/lib/libcrypto/doc/DSA_set_method.pod @@ -0,0 +1,111 @@ +=pod + +=head1 NAME + +DSA_set_default_method, DSA_get_default_method, DSA_set_method, +DSA_new_method, DSA_OpenSSL - select RSA method + +=head1 SYNOPSIS + + #include + + void DSA_set_default_method(DSA_METHOD *meth); + + DSA_METHOD *DSA_get_default_method(void); + + DSA_METHOD *DSA_set_method(DSA *dsa, DSA_METHOD *meth); + + DSA *DSA_new_method(DSA_METHOD *meth); + + DSA_METHOD *DSA_OpenSSL(void); + +=head1 DESCRIPTION + +A B specifies the functions that OpenSSL uses for DSA +operations. By modifying the method, alternative implementations +such as hardware accelerators may be used. + +Initially, the default is to use the OpenSSL internal implementation. +DSA_OpenSSL() returns a pointer to that method. + +DSA_set_default_method() makes B the default method for all B +structures created later. + +DSA_get_default_method() returns a pointer to the current default +method. + +DSA_set_method() selects B for all operations using the structure B. + +DSA_get_method() returns a pointer to the method currently selected +for B. + +DSA_new_method() allocates and initializes a B structure so that +B will be used for the DSA operations. If B is B, +the default method is used. + +=head1 THE DSA_METHOD STRUCTURE + +struct + { + /* name of the implementation */ + const char *name; + + /* sign */ + DSA_SIG *(*dsa_do_sign)(const unsigned char *dgst, int dlen, + DSA *dsa); + + /* pre-compute k^-1 and r */ + int (*dsa_sign_setup)(DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp, + BIGNUM **rp); + + /* verify */ + int (*dsa_do_verify)(const unsigned char *dgst, int dgst_len, + DSA_SIG *sig, DSA *dsa); + + /* compute rr = a1^p1 * a2^p2 mod m. May be NULL */ + 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); + + /* compute r = a ^ p mod m. May be NULL */ + int (*bn_mod_exp)(DSA *dsa, BIGNUM *r, BIGNUM *a, + const BIGNUM *p, const BIGNUM *m, + BN_CTX *ctx, BN_MONT_CTX *m_ctx); + + /* called at DSA_new */ + int (*init)(DSA *DSA); + + /* called at DSA_free */ + int (*finish)(DSA *DSA); + + int flags; + + char *app_data; /* ?? */ + + } DSA_METHOD; + +=head1 RETURN VALUES + +DSA_OpenSSL(), DSA_get_default_method() and DSA_get_method() return +pointers to the respective Bs. + +DSA_set_default_method() returns no value. + +DSA_set_method() returns a pointer to the B previously +associated with B. + +DSA_new_method() returns B and sets an error code that can be +obtained by L if the allocation +fails. Otherwise it returns a pointer to the newly allocated +structure. + +=head1 SEE ALSO + +L, L + +=head1 HISTORY + +DSA_set_default_method(), DSA_get_default_method(), DSA_set_method(), +DSA_new_method() and DSA_OpenSSL() were added in OpenSSL 0.9.4. + +=cut -- cgit v1.2.3-55-g6feb