216 lines
10 KiB
Plaintext
216 lines
10 KiB
Plaintext
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=pod
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=head1 NAME
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DSA_meth_new, DSA_meth_free, DSA_meth_dup, DSA_meth_get0_name,
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DSA_meth_set1_name, DSA_meth_get_flags, DSA_meth_set_flags,
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DSA_meth_get0_app_data, DSA_meth_set0_app_data, DSA_meth_get_sign,
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DSA_meth_set_sign, DSA_meth_get_sign_setup, DSA_meth_set_sign_setup,
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DSA_meth_get_verify, DSA_meth_set_verify, DSA_meth_get_mod_exp,
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DSA_meth_set_mod_exp, DSA_meth_get_bn_mod_exp, DSA_meth_set_bn_mod_exp,
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DSA_meth_get_init, DSA_meth_set_init, DSA_meth_get_finish, DSA_meth_set_finish,
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DSA_meth_get_paramgen, DSA_meth_set_paramgen, DSA_meth_get_keygen,
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DSA_meth_set_keygen - Routines to build up DSA methods
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=head1 SYNOPSIS
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#include <openssl/dsa.h>
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DSA_METHOD *DSA_meth_new(const char *name, int flags);
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void DSA_meth_free(DSA_METHOD *dsam);
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DSA_METHOD *DSA_meth_dup(const DSA_METHOD *meth);
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const char *DSA_meth_get0_name(const DSA_METHOD *dsam);
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int DSA_meth_set1_name(DSA_METHOD *dsam, const char *name);
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int DSA_meth_get_flags(const DSA_METHOD *dsam);
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int DSA_meth_set_flags(DSA_METHOD *dsam, int flags);
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void *DSA_meth_get0_app_data(const DSA_METHOD *dsam);
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int DSA_meth_set0_app_data(DSA_METHOD *dsam, void *app_data);
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DSA_SIG *(*DSA_meth_get_sign(const DSA_METHOD *dsam))(const unsigned char *,
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int, DSA *);
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int DSA_meth_set_sign(DSA_METHOD *dsam, DSA_SIG *(*sign)(const unsigned char *,
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int, DSA *));
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int (*DSA_meth_get_sign_setup(const DSA_METHOD *dsam))(DSA *, BN_CTX *,$
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BIGNUM **, BIGNUM **);
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int DSA_meth_set_sign_setup(DSA_METHOD *dsam, int (*sign_setup)(DSA *, BN_CTX *,
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BIGNUM **, BIGNUM **));
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int (*DSA_meth_get_verify(const DSA_METHOD *dsam))(const unsigned char *,
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int, DSA_SIG *, DSA *);
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int DSA_meth_set_verify(DSA_METHOD *dsam, int (*verify)(const unsigned char *,
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int, DSA_SIG *, DSA *));
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int (*DSA_meth_get_mod_exp(const DSA_METHOD *dsam))(DSA *dsa, BIGNUM *rr, BIGNUM *a1,
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BIGNUM *p1, BIGNUM *a2, BIGNUM *p2,
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BIGNUM *m, BN_CTX *ctx,
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BN_MONT_CTX *in_mont);
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int DSA_meth_set_mod_exp(DSA_METHOD *dsam, int (*mod_exp)(DSA *dsa, BIGNUM *rr,
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BIGNUM *a1, BIGNUM *p1,
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BIGNUM *a2, BIGNUM *p2,
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BIGNUM *m, BN_CTX *ctx,
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BN_MONT_CTX *mont));
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int (*DSA_meth_get_bn_mod_exp(const DSA_METHOD *dsam))(DSA *dsa, BIGNUM *r, BIGNUM *a,
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const BIGNUM *p, const BIGNUM *m,
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BN_CTX *ctx, BN_MONT_CTX *mont);
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int DSA_meth_set_bn_mod_exp(DSA_METHOD *dsam, int (*bn_mod_exp)(DSA *dsa,
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BIGNUM *r,
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BIGNUM *a,
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const BIGNUM *p,
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const BIGNUM *m,
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BN_CTX *ctx,
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BN_MONT_CTX *mont));
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int (*DSA_meth_get_init(const DSA_METHOD *dsam))(DSA *);
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int DSA_meth_set_init(DSA_METHOD *dsam, int (*init)(DSA *));
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int (*DSA_meth_get_finish(const DSA_METHOD *dsam))(DSA *);
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int DSA_meth_set_finish(DSA_METHOD *dsam, int (*finish)(DSA *));
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int (*DSA_meth_get_paramgen(const DSA_METHOD *dsam))(DSA *, int,
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const unsigned char *,
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int, int *, unsigned long *,
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BN_GENCB *);
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int DSA_meth_set_paramgen(DSA_METHOD *dsam,
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int (*paramgen)(DSA *, int, const unsigned char *,
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int, int *, unsigned long *, BN_GENCB *));
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int (*DSA_meth_get_keygen(const DSA_METHOD *dsam))(DSA *);
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int DSA_meth_set_keygen(DSA_METHOD *dsam, int (*keygen)(DSA *));
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=head1 DESCRIPTION
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The B<DSA_METHOD> type is a structure used for the provision of custom DSA
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implementations. It provides a set of functions used by OpenSSL for the
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implementation of the various DSA capabilities. See the L<dsa> page for more
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information.
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DSA_meth_new() creates a new B<DSA_METHOD> structure. It should be given a
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unique B<name> and a set of B<flags>. The B<name> should be a NULL terminated
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string, which will be duplicated and stored in the B<DSA_METHOD> object. It is
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the callers responsibility to free the original string. The flags will be used
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during the construction of a new B<DSA> object based on this B<DSA_METHOD>. Any
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new B<DSA> object will have those flags set by default.
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DSA_meth_dup() creates a duplicate copy of the B<DSA_METHOD> object passed as a
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parameter. This might be useful for creating a new B<DSA_METHOD> based on an
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existing one, but with some differences.
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DSA_meth_free() destroys a B<DSA_METHOD> structure and frees up any memory
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associated with it.
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DSA_meth_get0_name() will return a pointer to the name of this DSA_METHOD. This
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is a pointer to the internal name string and so should not be freed by the
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caller. DSA_meth_set1_name() sets the name of the DSA_METHOD to B<name>. The
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string is duplicated and the copy is stored in the DSA_METHOD structure, so the
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caller remains responsible for freeing the memory associated with the name.
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DSA_meth_get_flags() returns the current value of the flags associated with this
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DSA_METHOD. DSA_meth_set_flags() provides the ability to set these flags.
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The functions DSA_meth_get0_app_data() and DSA_meth_set0_app_data() provide the
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ability to associate implementation specific data with the DSA_METHOD. It is
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the application's responsibility to free this data before the DSA_METHOD is
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freed via a call to DSA_meth_free().
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DSA_meth_get_sign() and DSA_meth_set_sign() get and set the function used for
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creating a DSA signature respectively. This function will be
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called in response to the application calling DSA_do_sign() (or DSA_sign()). The
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parameters for the function have the same meaning as for DSA_do_sign().
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DSA_meth_get_sign_setup() and DSA_meth_set_sign_setup() get and set the function
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used for precalculating the DSA signature values B<k^-1> and B<r>. This function
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will be called in response to the application calling DSA_sign_setup(). The
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parameters for the function have the same meaning as for DSA_sign_setup().
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DSA_meth_get_verify() and DSA_meth_set_verify() get and set the function used
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for verifying a DSA signature respectively. This function will be called in
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response to the application calling DSA_do_verify() (or DSA_verify()). The
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parameters for the function have the same meaning as for DSA_do_verify().
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DSA_meth_get_mod_exp() and DSA_meth_set_mod_exp() get and set the function used
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for computing the following value:
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rr = a1^p1 * a2^p2 mod m
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This function will be called by the default OpenSSL method during verification
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of a DSA signature. The result is stored in the B<rr> parameter. This function
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may be NULL.
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DSA_meth_get_bn_mod_exp() and DSA_meth_set_bn_mod_exp() get and set the function
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used for computing the following value:
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r = a ^ p mod m
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This function will be called by the default OpenSSL function for
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DSA_sign_setup(). The result is stored in the B<r> parameter. This function
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may be NULL.
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DSA_meth_get_init() and DSA_meth_set_init() get and set the function used
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for creating a new DSA instance respectively. This function will be
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called in response to the application calling DSA_new() (if the current default
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DSA_METHOD is this one) or DSA_new_method(). The DSA_new() and DSA_new_method()
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functions will allocate the memory for the new DSA object, and a pointer to this
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newly allocated structure will be passed as a parameter to the function. This
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function may be NULL.
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DSA_meth_get_finish() and DSA_meth_set_finish() get and set the function used
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for destroying an instance of a DSA object respectively. This function will be
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called in response to the application calling DSA_free(). A pointer to the DSA
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to be destroyed is passed as a parameter. The destroy function should be used
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for DSA implementation specific clean up. The memory for the DSA itself should
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not be freed by this function. This function may be NULL.
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DSA_meth_get_paramgen() and DSA_meth_set_paramgen() get and set the function
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used for generating DSA parameters respectively. This function will be called in
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response to the application calling DSA_generate_parameters_ex() (or
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DSA_generate_parameters()). The parameters for the function have the same
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meaning as for DSA_generate_parameters_ex().
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DSA_meth_get_keygen() and DSA_meth_set_keygen() get and set the function
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used for generating a new DSA key pair respectively. This function will be
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called in response to the application calling DSA_generate_key(). The parameter
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for the function has the same meaning as for DSA_generate_key().
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=head1 RETURN VALUES
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DSA_meth_new() and DSA_meth_dup() return the newly allocated DSA_METHOD object
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or NULL on failure.
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DSA_meth_get0_name() and DSA_meth_get_flags() return the name and flags
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associated with the DSA_METHOD respectively.
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All other DSA_meth_get_*() functions return the appropriate function pointer
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that has been set in the DSA_METHOD, or NULL if no such pointer has yet been
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set.
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DSA_meth_set1_name() and all DSA_meth_set_*() functions return 1 on success or
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0 on failure.
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=head1 SEE ALSO
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L<DSA_new(3)>, L<DSA_new(3)>, L<DSA_generate_parameters(3)>, L<DSA_generate_key(3)>,
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L<DSA_dup_DH(3)>, L<DSA_do_sign(3)>, L<DSA_set_method(3)>, L<DSA_SIG_new(3)>,
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L<DSA_sign(3)>, L<DSA_size(3)>, L<DSA_get0_pqg(3)>
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=head1 HISTORY
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The functions described here were added in OpenSSL 1.1.0.
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=head1 COPYRIGHT
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Copyright 2016-2018 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the OpenSSL license (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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