mirror of
https://github.com/openssl/openssl.git
synced 2024-12-09 05:51:54 +08:00
8c1cbc7210
CLA: trivial Reviewed-by: Shane Lontis <shane.lontis@oracle.com> Reviewed-by: Matthias St. Pierre <Matthias.St.Pierre@ncp-e.com> (Merged from https://github.com/openssl/openssl/pull/12320)
621 lines
22 KiB
Plaintext
621 lines
22 KiB
Plaintext
=pod
|
|
|
|
=head1 NAME
|
|
|
|
provider-base
|
|
- The basic OpenSSL library E<lt>-E<gt> provider functions
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
#include <openssl/core_dispatch.h>
|
|
|
|
/*
|
|
* None of these are actual functions, but are displayed like this for
|
|
* the function signatures for functions that are offered as function
|
|
* pointers in OSSL_DISPATCH arrays.
|
|
*/
|
|
|
|
/* Functions offered by libcrypto to the providers */
|
|
const OSSL_ITEM *core_gettable_params(const OSSL_CORE_HANDLE *handle);
|
|
int core_get_params(const OSSL_CORE_HANDLE *handle, OSSL_PARAM params[]);
|
|
int core_thread_start(const OSSL_CORE_HANDLE *handle,
|
|
OSSL_thread_stop_handler_fn handfn);
|
|
OPENSSL_CORE_CTX *core_get_library_context(const OSSL_CORE_HANDLE *handle);
|
|
void core_new_error(const OSSL_CORE_HANDLE *handle);
|
|
void core_set_error_debug(const OSSL_CORE_HANDLE *handle,
|
|
const char *file, int line, const char *func);
|
|
void core_vset_error(const OSSL_CORE_HANDLE *handle,
|
|
uint32_t reason, const char *fmt, va_list args);
|
|
|
|
/*
|
|
* Some OpenSSL functionality is directly offered to providers via
|
|
* dispatch
|
|
*/
|
|
void *CRYPTO_malloc(size_t num, const char *file, int line);
|
|
void *CRYPTO_zalloc(size_t num, const char *file, int line);
|
|
void *CRYPTO_memdup(const void *str, size_t siz,
|
|
const char *file, int line);
|
|
char *CRYPTO_strdup(const char *str, const char *file, int line);
|
|
char *CRYPTO_strndup(const char *str, size_t s,
|
|
const char *file, int line);
|
|
void CRYPTO_free(void *ptr, const char *file, int line);
|
|
void CRYPTO_clear_free(void *ptr, size_t num,
|
|
const char *file, int line);
|
|
void *CRYPTO_realloc(void *addr, size_t num,
|
|
const char *file, int line);
|
|
void *CRYPTO_clear_realloc(void *addr, size_t old_num, size_t num,
|
|
const char *file, int line);
|
|
void *CRYPTO_secure_malloc(size_t num, const char *file, int line);
|
|
void *CRYPTO_secure_zalloc(size_t num, const char *file, int line);
|
|
void CRYPTO_secure_free(void *ptr, const char *file, int line);
|
|
void CRYPTO_secure_clear_free(void *ptr, size_t num,
|
|
const char *file, int line);
|
|
int CRYPTO_secure_allocated(const void *ptr);
|
|
void OPENSSL_cleanse(void *ptr, size_t len);
|
|
|
|
OSSL_CORE_BIO * BIO_new_file(const char *filename, const char *mode)
|
|
OSSL_CORE_BIO * BIO_new_membuf(const void *buf, int len)
|
|
int BIO_read_ex(OSSL_CORE_BIO *bio, void *data, size_t data_len,
|
|
size_t *bytes_read))
|
|
int BIO_write_ex(OSSL_CORE_BIO *bio, const void *data, size_t data_len,
|
|
size_t *written)
|
|
int BIO_free(OSSL_CORE_BIO *bio))
|
|
int BIO_vprintf(OSSL_CORE_BIO *bio, const char *format, va_list args)
|
|
int BIO_vsnprintf(char *buf, size_t n, const char *fmt, va_list args)
|
|
|
|
void self_test_cb(OPENSSL_CORE_CTX *ctx, OSSL_CALLBACK **cb, void **cbarg)
|
|
|
|
|
|
/* Functions offered by the provider to libcrypto */
|
|
void provider_teardown(void *provctx);
|
|
const OSSL_ITEM *provider_gettable_params(void *provctx);
|
|
int provider_get_params(void *provctx, OSSL_PARAM params[]);
|
|
const OSSL_ALGORITHM *provider_query_operation(void *provctx,
|
|
int operation_id,
|
|
const int *no_store);
|
|
const OSSL_ITEM *provider_get_reason_strings(void *provctx);
|
|
int provider_get_capabilities(void *provctx, const char *capability,
|
|
OSSL_CALLBACK *cb, void *arg);
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
All "functions" mentioned here are passed as function pointers between
|
|
F<libcrypto> and the provider in B<OSSL_DISPATCH> arrays, in the call
|
|
of the provider initialization function. See L<provider(7)/Provider>
|
|
for a description of the initialization function.
|
|
|
|
All these "functions" have a corresponding function type definition
|
|
named B<OSSL_{name}_fn>, and a helper function to retrieve the
|
|
function pointer from a B<OSSL_DISPATCH> element named
|
|
B<OSSL_FUNC_{name}>.
|
|
For example, the "function" core_gettable_params() has these:
|
|
|
|
typedef OSSL_PARAM *
|
|
(OSSL_FUNC_core_gettable_params_fn)(const OSSL_CORE_HANDLE *handle);
|
|
static ossl_inline OSSL_NAME_core_gettable_params_fn
|
|
OSSL_FUNC_core_gettable_params(const OSSL_DISPATCH *opf);
|
|
|
|
B<OSSL_DISPATCH> arrays are indexed by numbers that are provided as
|
|
macros in L<openssl-core_dispatch.h(7)>, as follows:
|
|
|
|
For I<in> (the B<OSSL_DISPATCH> array passed from F<libcrypto> to the
|
|
provider):
|
|
|
|
core_gettable_params OSSL_FUNC_CORE_GETTABLE_PARAMS
|
|
core_get_params OSSL_FUNC_CORE_GET_PARAMS
|
|
core_thread_start OSSL_FUNC_CORE_THREAD_START
|
|
core_get_library_context OSSL_FUNC_CORE_GET_LIBRARY_CONTEXT
|
|
core_new_error OSSL_FUNC_CORE_NEW_ERROR
|
|
core_set_error_debug OSSL_FUNC_CORE_SET_ERROR_DEBUG
|
|
core_set_error OSSL_FUNC_CORE_SET_ERROR
|
|
CRYPTO_malloc OSSL_FUNC_CRYPTO_MALLOC
|
|
CRYPTO_zalloc OSSL_FUNC_CRYPTO_ZALLOC
|
|
CRYPTO_memdup OSSL_FUNC_CRYPTO_MEMDUP
|
|
CRYPTO_strdup OSSL_FUNC_CRYPTO_STRDUP
|
|
CRYPTO_strndup OSSL_FUNC_CRYPTO_STRNDUP
|
|
CRYPTO_free OSSL_FUNC_CRYPTO_FREE
|
|
CRYPTO_clear_free OSSL_FUNC_CRYPTO_CLEAR_FREE
|
|
CRYPTO_realloc OSSL_FUNC_CRYPTO_REALLOC
|
|
CRYPTO_clear_realloc OSSL_FUNC_CRYPTO_CLEAR_REALLOC
|
|
CRYPTO_secure_malloc OSSL_FUNC_CRYPTO_SECURE_MALLOC
|
|
CRYPTO_secure_zalloc OSSL_FUNC_CRYPTO_SECURE_ZALLOC
|
|
CRYPTO_secure_free OSSL_FUNC_CRYPTO_SECURE_FREE
|
|
CRYPTO_secure_clear_free OSSL_FUNC_CRYPTO_SECURE_CLEAR_FREE
|
|
CRYPTO_secure_allocated OSSL_FUNC_CRYPTO_SECURE_ALLOCATED
|
|
BIO_new_file OSSL_FUNC_BIO_NEW_FILE
|
|
BIO_new_mem_buf OSSL_FUNC_BIO_NEW_MEMBUF
|
|
BIO_read_ex OSSL_FUNC_BIO_READ_EX
|
|
BIO_free OSSL_FUNC_BIO_FREE
|
|
BIO_vprintf OSSL_FUNC_BIO_VPRINTF
|
|
OPENSSL_cleanse OSSL_FUNC_OPENSSL_CLEANSE
|
|
OSSL_SELF_TEST_set_callback OSSL_FUNC_SELF_TEST_CB
|
|
|
|
For I<*out> (the B<OSSL_DISPATCH> array passed from the provider to
|
|
F<libcrypto>):
|
|
|
|
provider_teardown OSSL_FUNC_PROVIDER_TEARDOWN
|
|
provider_gettable_params OSSL_FUNC_PROVIDER_GETTABLE_PARAMS
|
|
provider_get_params OSSL_FUNC_PROVIDER_GET_PARAMS
|
|
provider_query_operation OSSL_FUNC_PROVIDER_QUERY_OPERATION
|
|
provider_get_reason_strings OSSL_FUNC_PROVIDER_GET_REASON_STRINGS
|
|
provider_get_capabilities OSSL_FUNC_PROVIDER_GET_CAPABILITIES
|
|
|
|
=head2 Core functions
|
|
|
|
core_gettable_params() returns a constant array of descriptor
|
|
B<OSSL_PARAM>, for parameters that core_get_params() can handle.
|
|
|
|
core_get_params() retrieves parameters from the core for the given I<handle>.
|
|
See L</Core parameters> below for a description of currently known
|
|
parameters.
|
|
|
|
=for comment core_thread_start() TBA
|
|
|
|
core_get_library_context() retrieves the library context in which the library
|
|
object for the current provider is stored, accessible through the I<handle>.
|
|
This may sometimes be useful if the provider wishes to store a
|
|
reference to its context in the same library context.
|
|
|
|
core_new_error(), core_set_error_debug() and core_set_error() are
|
|
building blocks for reporting an error back to the core, with
|
|
reference to the I<handle>.
|
|
|
|
=over 4
|
|
|
|
=item core_new_error()
|
|
|
|
allocates a new thread specific error record.
|
|
|
|
This corresponds to the OpenSSL function L<ERR_new(3)>.
|
|
|
|
=item core_set_error_debug()
|
|
|
|
sets debugging information in the current thread specific error
|
|
record.
|
|
The debugging information includes the name of the file I<file>, the
|
|
line I<line> and the function name I<func> where the error occurred.
|
|
|
|
This corresponds to the OpenSSL function L<ERR_set_debug(3)>.
|
|
|
|
=item core_set_error()
|
|
|
|
sets the I<reason> for the error, along with any addition data.
|
|
The I<reason> is a number defined by the provider and used to index
|
|
the reason strings table that's returned by
|
|
provider_get_reason_strings().
|
|
The additional data is given as a format string I<fmt> and a set of
|
|
arguments I<args>, which are treated in the same manner as with
|
|
BIO_vsnprintf().
|
|
I<file> and I<line> may also be passed to indicate exactly where the
|
|
error occurred or was reported.
|
|
|
|
This corresponds to the OpenSSL function L<ERR_vset_error(3)>.
|
|
|
|
=back
|
|
|
|
CRYPTO_malloc(), CRYPTO_zalloc(), CRYPTO_memdup(), CRYPTO_strdup(),
|
|
CRYPTO_strndup(), CRYPTO_free(), CRYPTO_clear_free(),
|
|
CRYPTO_realloc(), CRYPTO_clear_realloc(), CRYPTO_secure_malloc(),
|
|
CRYPTO_secure_zalloc(), CRYPTO_secure_free(),
|
|
CRYPTO_secure_clear_free(), CRYPTO_secure_allocated(),
|
|
BIO_new_file(), BIO_new_mem_buf(), BIO_read_ex(), BIO_free(),
|
|
BIO_vprintf(), OPENSSL_cleanse(), and OPENSSL_hexstr2buf()
|
|
correspond exactly to the public functions with the same name.
|
|
As a matter of fact, the pointers in the B<OSSL_DISPATCH> array are
|
|
direct pointers to those public functions. Note that the BIO functions take an
|
|
B<OSSL_CORE_BIO> type rather than the standard B<BIO> type. This is to ensure
|
|
that a provider does not mix BIOs from the core with BIOs used on the provider
|
|
side (the two are not compatible).
|
|
OSSL_SELF_TEST_set_callback() is used to set an optional callback that can be
|
|
passed into a provider. This may be ignored by a provider.
|
|
|
|
=head2 Provider functions
|
|
|
|
provider_teardown() is called when a provider is shut down and removed
|
|
from the core's provider store.
|
|
It must free the passed I<provctx>.
|
|
|
|
provider_gettable_params() should return a constant array of
|
|
descriptor B<OSSL_PARAM>, for parameters that provider_get_params()
|
|
can handle.
|
|
|
|
provider_get_params() should process the B<OSSL_PARAM> array
|
|
I<params>, setting the values of the parameters it understands.
|
|
|
|
provider_query_operation() should return a constant B<OSSL_ALGORITHM>
|
|
that corresponds to the given I<operation_id>.
|
|
It should indicate if the core may store a reference to this array by
|
|
setting I<*no_store> to 0 (core may store a reference) or 1 (core may
|
|
not store a reference).
|
|
|
|
provider_get_reason_strings() should return a constant B<OSSL_ITEM>
|
|
array that provides reason strings for reason codes the provider may
|
|
use when reporting errors using core_put_error().
|
|
|
|
The provider_get_capabilities() function should call the callback I<cb> passing
|
|
it a set of B<OSSL_PARAM>s and the caller supplied argument I<arg>. The
|
|
B<OSSL_PARAM>s should provide details about the capability with the name given
|
|
in the I<capability> argument relevant for the provider context I<provctx>. If a
|
|
provider supports multiple capabilities with the given name then it may call the
|
|
callback multiple times (one for each capability). Capabilities can be useful for
|
|
describing the services that a provider can offer. For further details see the
|
|
L</CAPABILITIES> section below. It should return 1 on success or 0 on error.
|
|
|
|
None of these functions are mandatory, but a provider is fairly
|
|
useless without at least provider_query_operation(), and
|
|
provider_gettable_params() is fairly useless if not accompanied by
|
|
provider_get_params().
|
|
|
|
=head2 Provider parameters
|
|
|
|
provider_get_params() can return the following provider parameters to the core:
|
|
|
|
=over 4
|
|
|
|
=item "name" (B<OSSL_PROV_PARAM_NAME>) <UTF8_ptr>
|
|
|
|
This points to a string that should give a unique name for the provider.
|
|
|
|
=item "version" (B<OSSL_PROV_PARAM_VERSION>) <UTF8_ptr>
|
|
|
|
This points to a string that is a version number associated with this provider.
|
|
OpenSSL in-built providers use OPENSSL_VERSION_STR, but this may be different
|
|
for any third party provider. This string is for informational purposes only.
|
|
|
|
=item "buildinfo" (B<OSSL_PROV_PARAM_BUILDINFO>) <UTF8_ptr>
|
|
|
|
This points to a string that is a build information associated with this provider.
|
|
OpenSSL in-built providers use OPENSSL_FULL_VERSION_STR, but this may be
|
|
different for any third party provider.
|
|
|
|
=back
|
|
|
|
provider_gettable_params() should return the above parameters.
|
|
|
|
|
|
=head2 Core parameters
|
|
|
|
core_get_params() can retrieve the following core parameters for each provider:
|
|
|
|
=over 4
|
|
|
|
=item "openssl-version" (B<OSSL_PROV_PARAM_CORE_VERSION>) <UTF8_ptr>
|
|
|
|
This points to the OpenSSL libraries' full version string, i.e. the string
|
|
expanded from the macro B<OPENSSL_VERSION_STR>.
|
|
|
|
=item "provider-name" (B<OSSL_PROV_PARAM_CORE_PROV_NAME>) <UTF8_ptr>
|
|
|
|
This points to the OpenSSL libraries' idea of what the calling provider is named.
|
|
|
|
=item "module-filename" (B<OSSL_PROV_PARAM_CORE_MODULE_FILENAME>) <UTF8_ptr>
|
|
|
|
This points to a string containing the full filename of the providers
|
|
module file.
|
|
|
|
=back
|
|
|
|
Additionally, provider specific configuration parameters from the
|
|
config file are available, in dotted name form.
|
|
The dotted name form is a concatenation of section names and final
|
|
config command name separated by periods.
|
|
|
|
For example, let's say we have the following config example:
|
|
|
|
openssl_conf = openssl_init
|
|
|
|
[openssl_init]
|
|
providers = providers_sect
|
|
|
|
[providers_sect]
|
|
foo = foo_sect
|
|
|
|
[foo_sect]
|
|
activate = 1
|
|
data1 = 2
|
|
data2 = str
|
|
more = foo_more
|
|
|
|
[foo_more]
|
|
data3 = foo,bar
|
|
|
|
The provider will have these additional parameters available:
|
|
|
|
=over 4
|
|
|
|
=item "activate"
|
|
|
|
pointing at the string "1"
|
|
|
|
=item "data1"
|
|
|
|
pointing at the string "2"
|
|
|
|
=item "data2"
|
|
|
|
pointing at the string "str"
|
|
|
|
=item "more.data3"
|
|
|
|
pointing at the string "foo,bar"
|
|
|
|
=back
|
|
|
|
For more information on handling parameters, see L<OSSL_PARAM(3)> as
|
|
L<OSSL_PARAM_int(3)>.
|
|
|
|
=head1 CAPABILITIES
|
|
|
|
Capabilities describe some of the services that a provider can offer.
|
|
Applications can query the capabilities to discover those services.
|
|
|
|
=head3 "TLS-GROUP" Capability
|
|
|
|
The "TLS-GROUP" capability can be queried by libssl to discover the list of
|
|
TLS groups that a provider can support. Each group supported can be used for
|
|
key exchange during a TLS handshake. TLS clients can advertise the list of
|
|
TLS groups they support in the supported_groups extension, and TLS servers can
|
|
select a group from the offered list that they also support. In this way a
|
|
provider can add to the list of groups that libssl already supports with
|
|
additional ones.
|
|
|
|
Each TLS group that a provider supports should be described via the callback
|
|
passed in through the provider_get_capabilities function. Each group should have
|
|
the following details supplied (all are mandatory):
|
|
|
|
=over 4
|
|
|
|
=item "tls-group-name" (B<OSSL_CAPABILITY_TLS_GROUP_NAME>) <utf8 string>
|
|
|
|
The name of the group as given in the IANA TLS Supported Groups registry
|
|
L<https://www.iana.org/assignments/tls-parameters/tls-parameters.xhtml#tls-parameters-8>.
|
|
|
|
=item "tls-group-name-internal" (B<OSSL_CAPABILITY_TLS_GROUP_NAME_INTERNAL>) <utf8 string>
|
|
|
|
The name of the group as known by the provider. This could be the same as the
|
|
"tls-group-name", but does not have to be.
|
|
|
|
=item "tls-group-id" (B<OSSL_CAPABILITY_TLS_GROUP_ID>) <unsigned integer>
|
|
|
|
The TLS group id value as given in the IANA TLS Supported Groups registry.
|
|
|
|
=item "tls-group-alg" (B<OSSL_CAPABILITY_TLS_GROUP_ALG>) <utf8 string>
|
|
|
|
The name of a Key Management algorithm that the provider offers and that should
|
|
be used with this group. Keys created should be able to support key exchange.
|
|
The algorithm must support key and parameter generation as well as the
|
|
key/parameter generation parameter, B<OSSL_PKEY_PARAM_GROUP_NAME>. The group
|
|
name given via "tls-group-name-internal" above will be passed via
|
|
B<OSSL_PKEY_PARAM_GROUP_NAME> when libssl wishes to generate keys/parameters.
|
|
|
|
=item "tls-group-sec-bits" (B<OSSL_CAPABILITY_TLS_GROUP_SECURITY_BITS>) <unsigned integer>
|
|
|
|
The number of bits of security offered by keys in this group. The number of bits
|
|
should be comparable with the ones given in table 2 and 3 of the NIST SP800-57
|
|
document.
|
|
|
|
=item "tls-min-tls" (B<OSSL_CAPABILITY_TLS_GROUP_MIN_TLS>) <integer>
|
|
|
|
=item "tls-max-tls" (B<OSSL_CAPABILITY_TLS_GROUP_MAX_TLS>) <integer>
|
|
|
|
=item "tls-min-dtls" (B<OSSL_CAPABILITY_TLS_GROUP_MIN_DTLS>) <integer>
|
|
|
|
=item "tls-max-dtls" (B<OSSL_CAPABILITY_TLS_GROUP_MAX_DTLS>) <integer>
|
|
|
|
These parameters can be used to describe the minimum and maximum TLS and DTLS
|
|
versions supported by the group. The values equate to the on-the-wire encoding
|
|
of the various TLS versions. For example TLSv1.3 is 0x0304 (772 decimal), and
|
|
TLSv1.2 is 0x0303 (771 decimal). A 0 indicates that there is no defined minimum
|
|
or maximum. A -1 indicates that the group should not be used in that protocol.
|
|
|
|
=back
|
|
|
|
=head1 EXAMPLES
|
|
|
|
This is an example of a simple provider made available as a
|
|
dynamically loadable module.
|
|
It implements the fictitious algorithm C<FOO> for the fictitious
|
|
operation C<BAR>.
|
|
|
|
#include <malloc.h>
|
|
#include <openssl/core.h>
|
|
#include <openssl/core_dispatch.h>
|
|
|
|
/* Errors used in this provider */
|
|
#define E_MALLOC 1
|
|
|
|
static const OSSL_ITEM reasons[] = {
|
|
{ E_MALLOC, "memory allocation failure" }.
|
|
{ 0, NULL } /* Termination */
|
|
};
|
|
|
|
/*
|
|
* To ensure we get the function signature right, forward declare
|
|
* them using function types provided by openssl/core_dispatch.h
|
|
*/
|
|
OSSL_FUNC_bar_newctx_fn foo_newctx;
|
|
OSSL_FUNC_bar_freectx_fn foo_freectx;
|
|
OSSL_FUNC_bar_init_fn foo_init;
|
|
OSSL_FUNC_bar_update_fn foo_update;
|
|
OSSL_FUNC_bar_final_fn foo_final;
|
|
|
|
OSSL_FUNC_provider_query_operation_fn p_query;
|
|
OSSL_FUNC_provider_get_reason_strings_fn p_reasons;
|
|
OSSL_FUNC_provider_teardown_fn p_teardown;
|
|
|
|
OSSL_provider_init_fn OSSL_provider_init;
|
|
|
|
OSSL_FUNC_core_put_error *c_put_error = NULL;
|
|
|
|
/* Provider context */
|
|
struct prov_ctx_st {
|
|
OSSL_CORE_HANDLE *handle;
|
|
}
|
|
|
|
/* operation context for the algorithm FOO */
|
|
struct foo_ctx_st {
|
|
struct prov_ctx_st *provctx;
|
|
int b;
|
|
};
|
|
|
|
static void *foo_newctx(void *provctx)
|
|
{
|
|
struct foo_ctx_st *fooctx = malloc(sizeof(*fooctx));
|
|
|
|
if (fooctx != NULL)
|
|
fooctx->provctx = provctx;
|
|
else
|
|
c_put_error(provctx->handle, E_MALLOC, __FILE__, __LINE__);
|
|
return fooctx;
|
|
}
|
|
|
|
static void foo_freectx(void *fooctx)
|
|
{
|
|
free(fooctx);
|
|
}
|
|
|
|
static int foo_init(void *vfooctx)
|
|
{
|
|
struct foo_ctx_st *fooctx = vfooctx;
|
|
|
|
fooctx->b = 0x33;
|
|
}
|
|
|
|
static int foo_update(void *vfooctx, unsigned char *in, size_t inl)
|
|
{
|
|
struct foo_ctx_st *fooctx = vfooctx;
|
|
|
|
/* did you expect something serious? */
|
|
if (inl == 0)
|
|
return 1;
|
|
for (; inl-- > 0; in++)
|
|
*in ^= fooctx->b;
|
|
return 1;
|
|
}
|
|
|
|
static int foo_final(void *vfooctx)
|
|
{
|
|
struct foo_ctx_st *fooctx = vfooctx;
|
|
|
|
fooctx->b = 0x66;
|
|
}
|
|
|
|
static const OSSL_DISPATCH foo_fns[] = {
|
|
{ OSSL_FUNC_BAR_NEWCTX, (void (*)(void))foo_newctx },
|
|
{ OSSL_FUNC_BAR_FREECTX, (void (*)(void))foo_freectx },
|
|
{ OSSL_FUNC_BAR_INIT, (void (*)(void))foo_init },
|
|
{ OSSL_FUNC_BAR_UPDATE, (void (*)(void))foo_update },
|
|
{ OSSL_FUNC_BAR_FINAL, (void (*)(void))foo_final },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static const OSSL_ALGORITHM bars[] = {
|
|
{ "FOO", "provider=chumbawamba", foo_fns },
|
|
{ NULL, NULL, NULL }
|
|
};
|
|
|
|
static const OSSL_ALGORITHM *p_query(void *provctx, int operation_id,
|
|
int *no_store)
|
|
{
|
|
switch (operation_id) {
|
|
case OSSL_OP_BAR:
|
|
return bars;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static const OSSL_ITEM *p_reasons(void *provctx)
|
|
{
|
|
return reasons;
|
|
}
|
|
|
|
static void p_teardown(void *provctx)
|
|
{
|
|
free(provctx);
|
|
}
|
|
|
|
static const OSSL_DISPATCH prov_fns[] = {
|
|
{ OSSL_FUNC_PROVIDER_TEARDOWN, (void (*)(void))p_teardown },
|
|
{ OSSL_FUNC_PROVIDER_QUERY_OPERATION, (void (*)(void))p_query },
|
|
{ OSSL_FUNC_PROVIDER_GET_REASON_STRINGS, (void (*)(void))p_reasons },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
int OSSL_provider_init(const OSSL_CORE_HANDLE *handle,
|
|
const OSSL_DISPATCH *in,
|
|
const OSSL_DISPATCH **out,
|
|
void **provctx)
|
|
{
|
|
struct prov_ctx_st *pctx = NULL;
|
|
|
|
for (; in->function_id != 0; in++)
|
|
switch (in->function_id) {
|
|
case OSSL_FUNC_CORE_PUT_ERROR:
|
|
c_put_error = OSSL_FUNC_core_put_error(in);
|
|
break;
|
|
}
|
|
|
|
*out = prov_fns;
|
|
|
|
if ((pctx = malloc(sizeof(*pctx))) == NULL) {
|
|
/*
|
|
* ALEA IACTA EST, if the core retrieves the reason table
|
|
* regardless, that string will be displayed, otherwise not.
|
|
*/
|
|
c_put_error(handle, E_MALLOC, __FILE__, __LINE__);
|
|
return 0;
|
|
}
|
|
pctx->handle = handle;
|
|
return 1;
|
|
}
|
|
|
|
This relies on a few things existing in F<openssl/core_dispatch.h>:
|
|
|
|
#define OSSL_OP_BAR 4711
|
|
|
|
#define OSSL_FUNC_BAR_NEWCTX 1
|
|
typedef void *(OSSL_FUNC_bar_newctx_fn)(void *provctx);
|
|
static ossl_inline OSSL_FUNC_bar_newctx(const OSSL_DISPATCH *opf)
|
|
{ return (OSSL_FUNC_bar_newctx_fn *)opf->function; }
|
|
|
|
#define OSSL_FUNC_BAR_FREECTX 2
|
|
typedef void (OSSL_FUNC_bar_freectx_fn)(void *ctx);
|
|
static ossl_inline OSSL_FUNC_bar_newctx(const OSSL_DISPATCH *opf)
|
|
{ return (OSSL_FUNC_bar_freectx_fn *)opf->function; }
|
|
|
|
#define OSSL_FUNC_BAR_INIT 3
|
|
typedef void *(OSSL_FUNC_bar_init_fn)(void *ctx);
|
|
static ossl_inline OSSL_FUNC_bar_init(const OSSL_DISPATCH *opf)
|
|
{ return (OSSL_FUNC_bar_init_fn *)opf->function; }
|
|
|
|
#define OSSL_FUNC_BAR_UPDATE 4
|
|
typedef void *(OSSL_FUNC_bar_update_fn)(void *ctx,
|
|
unsigned char *in, size_t inl);
|
|
static ossl_inline OSSL_FUNC_bar_update(const OSSL_DISPATCH *opf)
|
|
{ return (OSSL_FUNC_bar_update_fn *)opf->function; }
|
|
|
|
#define OSSL_FUNC_BAR_FINAL 5
|
|
typedef void *(OSSL_FUNC_bar_final_fn)(void *ctx);
|
|
static ossl_inline OSSL_FUNC_bar_final(const OSSL_DISPATCH *opf)
|
|
{ return (OSSL_FUNC_bar_final_fn *)opf->function; }
|
|
|
|
=head1 SEE ALSO
|
|
|
|
L<provider(7)>
|
|
|
|
=head1 HISTORY
|
|
|
|
The concept of providers and everything surrounding them was
|
|
introduced in OpenSSL 3.0.
|
|
|
|
=head1 COPYRIGHT
|
|
|
|
Copyright 2019-2020 The OpenSSL Project Authors. All Rights Reserved.
|
|
|
|
Licensed under the Apache License 2.0 (the "License"). You may not use
|
|
this file except in compliance with the License. You can obtain a copy
|
|
in the file LICENSE in the source distribution or at
|
|
L<https://www.openssl.org/source/license.html>.
|
|
|
|
=cut
|