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Title "DSA_METH_NEW 3"
way too many mistakes in technical documents.
The following functions have been deprecated since OpenSSL 3.0, and can be hidden entirely by defining \s-1OPENSSL_API_COMPAT\s0 with a suitable version value, see openssl_user_macros\|(7):
.Vb 1 DSA_METHOD *DSA_meth_new(const char *name, int flags); \& void DSA_meth_free(DSA_METHOD *dsam); \& DSA_METHOD *DSA_meth_dup(const DSA_METHOD *meth); \& const char *DSA_meth_get0_name(const DSA_METHOD *dsam); int DSA_meth_set1_name(DSA_METHOD *dsam, const char *name); \& int DSA_meth_get_flags(const DSA_METHOD *dsam); int DSA_meth_set_flags(DSA_METHOD *dsam, int flags); \& void *DSA_meth_get0_app_data(const DSA_METHOD *dsam); int DSA_meth_set0_app_data(DSA_METHOD *dsam, void *app_data); \& DSA_SIG *(*DSA_meth_get_sign(const DSA_METHOD *dsam))(const unsigned char *, int, DSA *); int DSA_meth_set_sign(DSA_METHOD *dsam, DSA_SIG *(*sign)(const unsigned char *, int, DSA *)); \& int (*DSA_meth_get_sign_setup(const DSA_METHOD *dsam))(DSA *, BN_CTX *,$ BIGNUM **, BIGNUM **); int DSA_meth_set_sign_setup(DSA_METHOD *dsam, int (*sign_setup)(DSA *, BN_CTX *, BIGNUM **, BIGNUM **)); \& int (*DSA_meth_get_verify(const DSA_METHOD *dsam))(const unsigned char *, int, DSA_SIG *, DSA *); int DSA_meth_set_verify(DSA_METHOD *dsam, int (*verify)(const unsigned char *, int, DSA_SIG *, DSA *)); \& int (*DSA_meth_get_mod_exp(const DSA_METHOD *dsam))(DSA *dsa, BIGNUM *rr, BIGNUM *a1, BIGNUM *p1, BIGNUM *a2, BIGNUM *p2, BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *in_mont); int DSA_meth_set_mod_exp(DSA_METHOD *dsam, int (*mod_exp)(DSA *dsa, BIGNUM *rr, BIGNUM *a1, BIGNUM *p1, BIGNUM *a2, BIGNUM *p2, BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *mont)); \& int (*DSA_meth_get_bn_mod_exp(const DSA_METHOD *dsam))(DSA *dsa, BIGNUM *r, BIGNUM *a, const BIGNUM *p, const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *mont); int DSA_meth_set_bn_mod_exp(DSA_METHOD *dsam, int (*bn_mod_exp)(DSA *dsa, BIGNUM *r, BIGNUM *a, const BIGNUM *p, const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *mont)); \& int (*DSA_meth_get_init(const DSA_METHOD *dsam))(DSA *); int DSA_meth_set_init(DSA_METHOD *dsam, int (*init)(DSA *)); \& int (*DSA_meth_get_finish(const DSA_METHOD *dsam))(DSA *); int DSA_meth_set_finish(DSA_METHOD *dsam, int (*finish)(DSA *)); \& int (*DSA_meth_get_paramgen(const DSA_METHOD *dsam))(DSA *, int, const unsigned char *, int, int *, unsigned long *, BN_GENCB *); int DSA_meth_set_paramgen(DSA_METHOD *dsam, int (*paramgen)(DSA *, int, const unsigned char *, int, int *, unsigned long *, BN_GENCB *)); \& int (*DSA_meth_get_keygen(const DSA_METHOD *dsam))(DSA *); int DSA_meth_set_keygen(DSA_METHOD *dsam, int (*keygen)(DSA *)); .Ve
The \s-1DSA_METHOD\s0 type is a structure used for the provision of custom \s-1DSA\s0 implementations. It provides a set of functions used by OpenSSL for the implementation of the various \s-1DSA\s0 capabilities.
\fBDSA_meth_new() creates a new \s-1DSA_METHOD\s0 structure. It should be given a unique name and a set of flags. The name should be a \s-1NULL\s0 terminated string, which will be duplicated and stored in the \s-1DSA_METHOD\s0 object. It is the callers responsibility to free the original string. The flags will be used during the construction of a new \s-1DSA\s0 object based on this \s-1DSA_METHOD\s0. Any new \s-1DSA\s0 object will have those flags set by default.
\fBDSA_meth_dup() creates a duplicate copy of the \s-1DSA_METHOD\s0 object passed as a parameter. This might be useful for creating a new \s-1DSA_METHOD\s0 based on an existing one, but with some differences.
\fBDSA_meth_free() destroys a \s-1DSA_METHOD\s0 structure and frees up any memory associated with it.
\fBDSA_meth_get0_name() will return a pointer to the name of this \s-1DSA_METHOD.\s0 This is a pointer to the internal name string and so should not be freed by the caller. DSA_meth_set1_name() sets the name of the \s-1DSA_METHOD\s0 to name. The string is duplicated and the copy is stored in the \s-1DSA_METHOD\s0 structure, so the caller remains responsible for freeing the memory associated with the name.
\fBDSA_meth_get_flags() returns the current value of the flags associated with this \s-1DSA_METHOD.\s0 DSA_meth_set_flags() provides the ability to set these flags.
The functions DSA_meth_get0_app_data() and DSA_meth_set0_app_data() provide the ability to associate implementation specific data with the \s-1DSA_METHOD.\s0 It is the application's responsibility to free this data before the \s-1DSA_METHOD\s0 is freed via a call to DSA_meth_free().
\fBDSA_meth_get_sign() and DSA_meth_set_sign() get and set the function used for creating a \s-1DSA\s0 signature respectively. This function will be called in response to the application calling DSA_do_sign() (or DSA_sign()). The parameters for the function have the same meaning as for DSA_do_sign().
\fBDSA_meth_get_sign_setup() and DSA_meth_set_sign_setup() get and set the function used for precalculating the \s-1DSA\s0 signature values k^-1 and r. This function will be called in response to the application calling DSA_sign_setup(). The parameters for the function have the same meaning as for DSA_sign_setup().
\fBDSA_meth_get_verify() and DSA_meth_set_verify() get and set the function used for verifying a \s-1DSA\s0 signature respectively. This function will be called in response to the application calling DSA_do_verify() (or DSA_verify()). The parameters for the function have the same meaning as for DSA_do_verify().
\fBDSA_meth_get_mod_exp() and DSA_meth_set_mod_exp() get and set the function used for computing the following value:
.Vb 1 rr = a1^p1 * a2^p2 mod m .Ve
This function will be called by the default OpenSSL method during verification of a \s-1DSA\s0 signature. The result is stored in the rr parameter. This function may be \s-1NULL.\s0
\fBDSA_meth_get_bn_mod_exp() and DSA_meth_set_bn_mod_exp() get and set the function used for computing the following value:
.Vb 1 r = a ^ p mod m .Ve
This function will be called by the default OpenSSL function for \fBDSA_sign_setup(). The result is stored in the r parameter. This function may be \s-1NULL.\s0
\fBDSA_meth_get_init() and DSA_meth_set_init() get and set the function used for creating a new \s-1DSA\s0 instance respectively. This function will be called in response to the application calling DSA_new() (if the current default \s-1DSA_METHOD\s0 is this one) or DSA_new_method(). The DSA_new() and DSA_new_method() functions will allocate the memory for the new \s-1DSA\s0 object, and a pointer to this newly allocated structure will be passed as a parameter to the function. This function may be \s-1NULL.\s0
\fBDSA_meth_get_finish() and DSA_meth_set_finish() get and set the function used for destroying an instance of a \s-1DSA\s0 object respectively. This function will be called in response to the application calling DSA_free(). A pointer to the \s-1DSA\s0 to be destroyed is passed as a parameter. The destroy function should be used for \s-1DSA\s0 implementation specific clean up. The memory for the \s-1DSA\s0 itself should not be freed by this function. This function may be \s-1NULL.\s0
\fBDSA_meth_get_paramgen() and DSA_meth_set_paramgen() get and set the function used for generating \s-1DSA\s0 parameters respectively. This function will be called in response to the application calling DSA_generate_parameters_ex() (or \fBDSA_generate_parameters()). The parameters for the function have the same meaning as for DSA_generate_parameters_ex().
\fBDSA_meth_get_keygen() and DSA_meth_set_keygen() get and set the function used for generating a new \s-1DSA\s0 key pair respectively. This function will be called in response to the application calling DSA_generate_key(). The parameter for the function has the same meaning as for DSA_generate_key().
\fBDSA_meth_get0_name() and DSA_meth_get_flags() return the name and flags associated with the \s-1DSA_METHOD\s0 respectively.
All other DSA_meth_get_*() functions return the appropriate function pointer that has been set in the \s-1DSA_METHOD,\s0 or \s-1NULL\s0 if no such pointer has yet been set.
\fBDSA_meth_set1_name() and all DSA_meth_set_*() functions return 1 on success or 0 on failure.
The functions described here were added in OpenSSL 1.1.0.
Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.