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Title "DSA_SET_METHOD 1" C DSA_set_default_method, DSA_get_default_method, DSA_set_method, DSA_new_method, DSA_OpenSSL - select \s-1DSA\s0 method 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 Header "DESCRIPTION" A \s-1DSA_METHOD\s0 specifies the functions that OpenSSL uses for \s-1DSA\s0 operations. By modifying the method, alternative implementations such as hardware accelerators may be used.

Initially, the default is to use the OpenSSL internal implementation. \fIDSA_OpenSSL() returns a pointer to that method.

\fIDSA_set_default_method() makes meth the default method for all \s-1DSA\s0 structures created later.

\fIDSA_get_default_method() returns a pointer to the current default method.

\fIDSA_set_method() selects meth for all operations using the structure dsa.

\fIDSA_new_method() allocates and initializes a \s-1DSA\s0 structure so that \fBmethod will be used for the \s-1DSA\s0 operations. If method is \s-1NULL\s0, the default method is used.

Header "THE DSA_METHOD STRUCTURE" struct { /* name of the implementation */ const char *name;

.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

Header "RETURN VALUES" \fIDSA_OpenSSL() and DSA_get_default_method() return pointers to the respective \s-1DSA_METHOD\s0s.

\fIDSA_set_default_method() returns no value.

\fIDSA_set_method() returns a pointer to the \s-1DSA_METHOD\s0 previously associated with dsa.

\fIDSA_new_method() returns \s-1NULL\s0 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.

Header "SEE ALSO" dsa(3), DSA_new(3) Header "HISTORY" \fIDSA_set_default_method(), DSA_get_default_method(), DSA_set_method(), \fIDSA_new_method() and DSA_OpenSSL() were added in OpenSSL 0.9.4.