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DSA_set_method(3ssl) |
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DSA_set_default_openssl_method, DSA_get_default_openssl_method, DSA_set_method, DSA_new_method, DSA_OpenSSL − select DSA method
#include <openssl/dsa.h> #include <openssl/engine.h> void DSA_set_default_openssl_method(DSA_METHOD *meth); DSA_METHOD *DSA_get_default_openssl_method(void); int DSA_set_method(DSA *dsa, ENGINE *engine); DSA *DSA_new_method(ENGINE *engine); DSA_METHOD *DSA_OpenSSL(void);
A DSA_METHOD 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_openssl_method() makes meth the default method for all DSA structures created later. NB: This is true only whilst the default engine for DSA operations remains as "openssl". ENGINEs provide an encapsulation for implementations of one or more algorithms at a time, and all the DSA functions mentioned here operate within the scope of the default "openssl" engine.
DSA_get_default_openssl_method() returns a pointer to the current default method for the "openssl" engine.
DSA_set_method() selects engine for all operations using the structure dsa.
DSA_new_method() allocates and initializes a DSA structure so that engine will be used for the DSA operations. If engine is NULL, the default engine for DSA operations is used.
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 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);
/* 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);
/* called at DSA_new */
int (*init)(DSA *DSA);
/* called at DSA_free */
int (*finish)(DSA *DSA);
int flags;
char *app_data; /* ?? */
} DSA_METHOD;
DSA_OpenSSL() and DSA_get_default_openssl_method() return pointers to the respective DSA_METHODs.
DSA_set_default_openssl_method() returns no value.
DSA_set_method() returns non-zero if the ENGINE associated with dsa was successfully changed to engine.
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.
dsa(3), DSA_new(3)
DSA_set_default_method(), DSA_get_default_method(), DSA_set_method(), DSA_new_method() and DSA_OpenSSL() were added in OpenSSL 0.9.4.
DSA_set_default_openssl_method() and DSA_get_default_openssl_method() replaced DSA_set_default_method() and DSA_get_default_method() respectively, and DSA_set_method() and DSA_new_method() were altered to use ENGINEs rather than DSA_METHODs during development of OpenSSL 0.9.6.
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DSA_set_method(3ssl) | |