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DSA_SET_METHOD(3) FreeBSD Library Functions Manual DSA_SET_METHOD(3) NAME DSA_set_default_method, DSA_get_default_method, DSA_set_method, DSA_new_method, DSA_OpenSSL - select DSA method SYNOPSIS #include <openssl/dsa.h> void DSA_set_default_method(const DSA_METHOD *meth); const DSA_METHOD * DSA_get_default_method(void); int DSA_set_method(DSA *dsa, const DSA_METHOD *meth); DSA * DSA_new_method(ENGINE *engine); DSA_METHOD * DSA_OpenSSL(void); DESCRIPTION A DSA_METHOD object contains pointers to the functions used for DSA operations. By default, the internal implementation returned by DSA_OpenSSL() is used. By selecting another method, alternative implementations such as hardware accelerators may be used. DSA_set_default_method() selects meth as the default method for all DSA structures created later. DSA_get_default_method() returns a pointer to the current default method. DSA_set_method() selects meth to perform all operations using the key dsa. This replaces the DSA_METHOD used by the DSA key. It is possible to have DSA keys that only work with certain DSA_METHOD implementations, and in such cases attempting to change the DSA_METHOD for the key can have unexpected results. DSA_new_method() allocates and initializes a DSA structure. The engine argument is ignored and the default method controlled by DSA_set_default_method() is used. The DSA_METHOD structure is defined as follows: 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); /* called at DSA_new */ int (*init)(DSA *DSA); /* called at DSA_free */ int (*finish)(DSA *DSA); int flags; } DSA_METHOD; RETURN VALUES DSA_OpenSSL() and DSA_get_default_method() return pointers to the respective DSA_METHOD. DSA_set_method() returns 1 on success or 0 on failure. Currently, it cannot fail. DSA_new_method() returns NULL 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. SEE ALSO DSA_meth_new(3), DSA_new(3) HISTORY DSA_set_default_method(), DSA_get_default_method(), DSA_set_method(), DSA_new_method(), and DSA_OpenSSL() first appeared in OpenSSL 0.9.5 and have been available since OpenBSD 2.7. FreeBSD 14.1-RELEASE-p8 May 11, 2024 FreeBSD 14.1-RELEASE-p8