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DSA_meth_new.3
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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" DSA_meth_new, DSA_meth_free, DSA_meth_dup, DSA_meth_get0_name, DSA_meth_set1_name, DSA_meth_get_flags, DSA_meth_set_flags, DSA_meth_get0_app_data, DSA_meth_set0_app_data, DSA_meth_get_sign, DSA_meth_set_sign, DSA_meth_get_sign_setup, DSA_meth_set_sign_setup, DSA_meth_get_verify, DSA_meth_set_verify, DSA_meth_get_mod_exp, DSA_meth_set_mod_exp, DSA_meth_get_bn_mod_exp, DSA_meth_set_bn_mod_exp, DSA_meth_get_init, DSA_meth_set_init, DSA_meth_get_finish, DSA_meth_set_finish, DSA_meth_get_paramgen, DSA_meth_set_paramgen, DSA_meth_get_keygen, DSA_meth_set_keygen \- Routines to build up DSA methods .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/dsa.h> \& \& 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 .SH "DESCRIPTION" .IX Header "DESCRIPTION" The \fB\s-1DSA_METHOD\s0\fR 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. See the dsa page for more information. .PP \&\fBDSA_meth_new()\fR creates a new \fB\s-1DSA_METHOD\s0\fR structure. It should be given a unique \fBname\fR and a set of \fBflags\fR. The \fBname\fR should be a \s-1NULL\s0 terminated string, which will be duplicated and stored in the \fB\s-1DSA_METHOD\s0\fR object. It is the callers responsibility to free the original string. The flags will be used during the construction of a new \fB\s-1DSA\s0\fR object based on this \fB\s-1DSA_METHOD\s0\fR. Any new \fB\s-1DSA\s0\fR object will have those flags set by default. .PP \&\fBDSA_meth_dup()\fR creates a duplicate copy of the \fB\s-1DSA_METHOD\s0\fR object passed as a parameter. This might be useful for creating a new \fB\s-1DSA_METHOD\s0\fR based on an existing one, but with some differences. .PP \&\fBDSA_meth_free()\fR destroys a \fB\s-1DSA_METHOD\s0\fR structure and frees up any memory associated with it. .PP \&\fBDSA_meth_get0_name()\fR 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. \fBDSA_meth_set1_name()\fR sets the name of the \s-1DSA_METHOD\s0 to \fBname\fR. 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. .PP \&\fBDSA_meth_get_flags()\fR returns the current value of the flags associated with this \&\s-1DSA_METHOD.\s0 \fBDSA_meth_set_flags()\fR provides the ability to set these flags. .PP The functions \fBDSA_meth_get0_app_data()\fR and \fBDSA_meth_set0_app_data()\fR 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 \fBDSA_meth_free()\fR. .PP \&\fBDSA_meth_get_sign()\fR and \fBDSA_meth_set_sign()\fR 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 \fBDSA_do_sign()\fR (or \fBDSA_sign()\fR). The parameters for the function have the same meaning as for \fBDSA_do_sign()\fR. .PP \&\fBDSA_meth_get_sign_setup()\fR and \fBDSA_meth_set_sign_setup()\fR get and set the function used for precalculating the \s-1DSA\s0 signature values \fBk^\-1\fR and \fBr\fR. This function will be called in response to the application calling \fBDSA_sign_setup()\fR. The parameters for the function have the same meaning as for \fBDSA_sign_setup()\fR. .PP \&\fBDSA_meth_get_verify()\fR and \fBDSA_meth_set_verify()\fR 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 \fBDSA_do_verify()\fR (or \fBDSA_verify()\fR). The parameters for the function have the same meaning as for \fBDSA_do_verify()\fR. .PP \&\fBDSA_meth_get_mod_exp()\fR and \fBDSA_meth_set_mod_exp()\fR get and set the function used for computing the following value: .PP .Vb 1 \& rr = a1^p1 * a2^p2 mod m .Ve .PP This function will be called by the default OpenSSL method during verification of a \s-1DSA\s0 signature. The result is stored in the \fBrr\fR parameter. This function may be \s-1NULL.\s0 .PP \&\fBDSA_meth_get_bn_mod_exp()\fR and \fBDSA_meth_set_bn_mod_exp()\fR get and set the function used for computing the following value: .PP .Vb 1 \& r = a ^ p mod m .Ve .PP This function will be called by the default OpenSSL function for \&\fBDSA_sign_setup()\fR. The result is stored in the \fBr\fR parameter. This function may be \s-1NULL.\s0 .PP \&\fBDSA_meth_get_init()\fR and \fBDSA_meth_set_init()\fR 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 \fBDSA_new()\fR (if the current default \&\s-1DSA_METHOD\s0 is this one) or \fBDSA_new_method()\fR. The \fBDSA_new()\fR and \fBDSA_new_method()\fR 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 .PP \&\fBDSA_meth_get_finish()\fR and \fBDSA_meth_set_finish()\fR 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 \fBDSA_free()\fR. 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 .PP \&\fBDSA_meth_get_paramgen()\fR and \fBDSA_meth_set_paramgen()\fR get and set the function used for generating \s-1DSA\s0 parameters respectively. This function will be called in response to the application calling \fBDSA_generate_parameters_ex()\fR (or \&\fBDSA_generate_parameters()\fR). The parameters for the function have the same meaning as for \fBDSA_generate_parameters_ex()\fR. .PP \&\fBDSA_meth_get_keygen()\fR and \fBDSA_meth_set_keygen()\fR 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 \fBDSA_generate_key()\fR. The parameter for the function has the same meaning as for \fBDSA_generate_key()\fR. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBDSA_meth_new()\fR and \fBDSA_meth_dup()\fR return the newly allocated \s-1DSA_METHOD\s0 object or \s-1NULL\s0 on failure. .PP \&\fBDSA_meth_get0_name()\fR and \fBDSA_meth_get_flags()\fR return the name and flags associated with the \s-1DSA_METHOD\s0 respectively. .PP 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. .PP \&\fBDSA_meth_set1_name()\fR and all DSA_meth_set_*() functions return 1 on success or 0 on failure. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBDSA_new\fR\|(3), \fBDSA_new\fR\|(3), \fBDSA_generate_parameters\fR\|(3), \fBDSA_generate_key\fR\|(3), \&\fBDSA_dup_DH\fR\|(3), \fBDSA_do_sign\fR\|(3), \fBDSA_set_method\fR\|(3), \fBDSA_SIG_new\fR\|(3), \&\fBDSA_sign\fR\|(3), \fBDSA_size\fR\|(3), \fBDSA_get0_pqg\fR\|(3) .SH "HISTORY" .IX Header "HISTORY" The functions described here were added in OpenSSL 1.1.0. .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2016\-2018 The OpenSSL Project Authors. All Rights Reserved. .PP Licensed under the OpenSSL license (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>.
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