381 lines
16 KiB
Plaintext
381 lines
16 KiB
Plaintext
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.\" ========================================================================
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.\"
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.IX Title "OSSL_PROVIDER 3ossl"
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.TH OSSL_PROVIDER 3ossl "2024-01-30" "3.2.1" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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OSSL_PROVIDER_set_default_search_path,
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OSSL_PROVIDER_get0_default_search_path,
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OSSL_PROVIDER, OSSL_PROVIDER_load, OSSL_PROVIDER_try_load, OSSL_PROVIDER_unload,
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OSSL_PROVIDER_load_ex, OSSL_PROVIDER_try_load_ex,
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OSSL_PROVIDER_available, OSSL_PROVIDER_do_all,
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OSSL_PROVIDER_gettable_params, OSSL_PROVIDER_get_params,
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OSSL_PROVIDER_query_operation, OSSL_PROVIDER_unquery_operation,
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OSSL_PROVIDER_get0_provider_ctx, OSSL_PROVIDER_get0_dispatch,
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OSSL_PROVIDER_add_builtin, OSSL_PROVIDER_get0_name, OSSL_PROVIDER_get_capabilities,
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OSSL_PROVIDER_self_test
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\&\- provider routines
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/provider.h>
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\&
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\& typedef struct ossl_provider_st OSSL_PROVIDER;
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\&
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\& int OSSL_PROVIDER_set_default_search_path(OSSL_LIB_CTX *libctx,
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\& const char *path);
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\& const char *OSSL_PROVIDER_get0_default_search_path(OSSL_LIB_CTX *libctx);
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\&
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\& OSSL_PROVIDER *OSSL_PROVIDER_load(OSSL_LIB_CTX *libctx, const char *name);
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\& OSSL_PROVIDER *OSSL_PROVIDER_load_ex(OSSL_LIB_CTX *, const char *name,
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\& OSSL_PARAM *params);
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\& OSSL_PROVIDER *OSSL_PROVIDER_try_load(OSSL_LIB_CTX *libctx, const char *name,
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\& int retain_fallbacks);
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\& OSSL_PROVIDER *OSSL_PROVIDER_try_load_ex(OSSL_LIB_CTX *, const char *name,
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\& OSSL_PARAM *params,
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\& int retain_fallbacks);
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\& int OSSL_PROVIDER_unload(OSSL_PROVIDER *prov);
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\& int OSSL_PROVIDER_available(OSSL_LIB_CTX *libctx, const char *name);
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\& int OSSL_PROVIDER_do_all(OSSL_LIB_CTX *ctx,
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\& int (*cb)(OSSL_PROVIDER *provider, void *cbdata),
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\& void *cbdata);
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\&
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\& const OSSL_PARAM *OSSL_PROVIDER_gettable_params(OSSL_PROVIDER *prov);
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\& int OSSL_PROVIDER_get_params(OSSL_PROVIDER *prov, OSSL_PARAM params[]);
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\&
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\& const OSSL_ALGORITHM *OSSL_PROVIDER_query_operation(const OSSL_PROVIDER *prov,
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\& int operation_id,
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\& int *no_cache);
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\& void OSSL_PROVIDER_unquery_operation(const OSSL_PROVIDER *prov,
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\& int operation_id,
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\& const OSSL_ALGORITHM *algs);
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\& void *OSSL_PROVIDER_get0_provider_ctx(const OSSL_PROVIDER *prov);
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\& const OSSL_DISPATCH *OSSL_PROVIDER_get0_dispatch(const OSSL_PROVIDER *prov);
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\&
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\& int OSSL_PROVIDER_add_builtin(OSSL_LIB_CTX *libctx, const char *name,
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\& ossl_provider_init_fn *init_fn);
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\&
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\& const char *OSSL_PROVIDER_get0_name(const OSSL_PROVIDER *prov);
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\&
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\& int OSSL_PROVIDER_get_capabilities(const OSSL_PROVIDER *prov,
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\& const char *capability,
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\& OSSL_CALLBACK *cb,
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\& void *arg);
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\& int OSSL_PROVIDER_self_test(const OSSL_PROVIDER *prov);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fB\s-1OSSL_PROVIDER\s0\fR is a type that holds internal information about
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implementation providers (see \fIprovider\fR\|(7) for information on what a
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provider is).
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A provider can be built in to the application or the OpenSSL
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libraries, or can be a loadable module.
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The functions described here handle both forms.
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.PP
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Some of these functions operate within a library context, please see
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\&\s-1\fIOSSL_LIB_CTX\s0\fR\|(3) for further details.
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.SS "Functions"
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.IX Subsection "Functions"
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\&\fIOSSL_PROVIDER_set_default_search_path()\fR specifies the default search \fIpath\fR
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that is to be used for looking for providers in the specified \fIlibctx\fR.
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If left unspecified, an environment variable and a fall back default value will
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be used instead.
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.PP
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\&\fIOSSL_PROVIDER_get0_default_search_path()\fR retrieves the default search \fIpath\fR
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that is to be used for looking for providers in the specified \fIlibctx\fR.
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If successful returns the path or empty string; the path is valid until the
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context is released or \fIOSSL_PROVIDER_set_default_search_path()\fR is called.
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.PP
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\&\fIOSSL_PROVIDER_add_builtin()\fR is used to add a built in provider to
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\&\fB\s-1OSSL_PROVIDER\s0\fR store in the given library context, by associating a
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provider name with a provider initialization function.
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This name can then be used with \fIOSSL_PROVIDER_load()\fR.
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.PP
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\&\fIOSSL_PROVIDER_load()\fR loads and initializes a provider.
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This may simply initialize a provider that was previously added with
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\&\fIOSSL_PROVIDER_add_builtin()\fR and run its given initialization function,
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or load a provider module with the given name and run its provider
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entry point, \f(CW\*(C`OSSL_provider_init\*(C'\fR. The \fIname\fR can be a path
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to a provider module, in that case the provider name as returned
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by \fIOSSL_PROVIDER_get0_name()\fR will be the path. Interpretation
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of relative paths is platform dependent and they are relative
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to the configured \*(L"\s-1MODULESDIR\*(R"\s0 directory or the path set in
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the environment variable \s-1OPENSSL_MODULES\s0 if set.
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.PP
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\&\fIOSSL_PROVIDER_try_load()\fR functions like \fIOSSL_PROVIDER_load()\fR, except that
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it does not disable the fallback providers if the provider cannot be
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loaded and initialized or if \fIretain_fallbacks\fR is nonzero.
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If the provider loads successfully and \fIretain_fallbacks\fR is zero, the
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fallback providers are disabled.
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.PP
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\&\fIOSSL_PROVIDER_load_ex()\fR and \fIOSSL_PROVIDER_try_load_ex()\fR are the variants
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of the previous functions accepting an \f(CW\*(C`OSSL_PARAM\*(C'\fR array of the parameters
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that are passed as the configuration of the loaded provider. The parameters
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of any type but \f(CW\*(C`OSSL_PARAM_UTF8_STRING\*(C'\fR are silently ignored. If the
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parameters are provided, they replace \fBall\fR the ones specified in the
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configuration file.
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.PP
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\&\fIOSSL_PROVIDER_unload()\fR unloads the given provider.
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For a provider added with \fIOSSL_PROVIDER_add_builtin()\fR, this simply
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runs its teardown function.
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.PP
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\&\fIOSSL_PROVIDER_available()\fR checks if a named provider is available
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for use.
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.PP
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\&\fIOSSL_PROVIDER_do_all()\fR iterates over all loaded providers, calling
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\&\fIcb\fR for each one, with the current provider in \fIprovider\fR and the
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\&\fIcbdata\fR that comes from the caller. If no other provider has been loaded
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before calling this function, the default provider is still available as
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fallback.
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See \fIOSSL_PROVIDER\-default\fR\|(7) for more information on this fallback
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behaviour.
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.PP
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\&\fIOSSL_PROVIDER_gettable_params()\fR is used to get a provider parameter
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descriptor set as a constant \s-1\fIOSSL_PARAM\s0\fR\|(3) array.
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.PP
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\&\fIOSSL_PROVIDER_get_params()\fR is used to get provider parameter values.
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The caller must prepare the \s-1\fIOSSL_PARAM\s0\fR\|(3) array before calling this
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function, and the variables acting as buffers for this parameter array
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should be filled with data when it returns successfully.
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.PP
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\&\fIOSSL_PROVIDER_self_test()\fR is used to run a provider's self tests on demand.
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If the self tests fail then the provider will fail to provide any further
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services and algorithms. \fIOSSL_SELF_TEST_set_callback\fR\|(3) may be called
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beforehand in order to display diagnostics for the running self tests.
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.PP
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\&\fIOSSL_PROVIDER_query_operation()\fR calls the provider's \fIquery_operation\fR
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function (see \fIprovider\fR\|(7)), if the provider has one. It returns an
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array of \fI\s-1OSSL_ALGORITHM\s0\fR for the given \fIoperation_id\fR terminated by an all
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\&\s-1NULL OSSL_ALGORITHM\s0 entry. This is considered a low-level function that most
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applications should not need to call.
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.PP
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\&\fIOSSL_PROVIDER_unquery_operation()\fR calls the provider's \fIunquery_operation\fR
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function (see \fIprovider\fR\|(7)), if the provider has one. This is considered a
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low-level function that most applications should not need to call.
|
||
|
|
.PP
|
||
|
|
\&\fIOSSL_PROVIDER_get0_provider_ctx()\fR returns the provider context for the given
|
||
|
|
provider. The provider context is an opaque handle set by the provider itself
|
||
|
|
and is passed back to the provider by libcrypto in various function calls.
|
||
|
|
.PP
|
||
|
|
\&\fIOSSL_PROVIDER_get0_dispatch()\fR returns the provider's dispatch table as it was
|
||
|
|
returned in the \fIout\fR parameter from the provider's init function. See
|
||
|
|
\&\fIprovider\-base\fR\|(7).
|
||
|
|
.PP
|
||
|
|
If it is permissible to cache references to this array then \fI*no_store\fR is set
|
||
|
|
to 0 or 1 otherwise. If the array is not cacheable then it is assumed to
|
||
|
|
have a short lifetime.
|
||
|
|
.PP
|
||
|
|
\&\fIOSSL_PROVIDER_get0_name()\fR returns the name of the given provider.
|
||
|
|
.PP
|
||
|
|
\&\fIOSSL_PROVIDER_get_capabilities()\fR provides information about the capabilities
|
||
|
|
supported by the provider specified in \fIprov\fR with the capability name
|
||
|
|
\&\fIcapability\fR. For each capability of that name supported by the provider it
|
||
|
|
will call the callback \fIcb\fR and supply a set of \s-1\fIOSSL_PARAM\s0\fR\|(3)s describing the
|
||
|
|
capability. It will also pass back the argument \fIarg\fR. For more details about
|
||
|
|
capabilities and what they can be used for please see
|
||
|
|
\&\*(L"\s-1CAPABILTIIES\*(R"\s0 in \fIprovider\-base\fR\|(7).
|
||
|
|
.SH "RETURN VALUES"
|
||
|
|
.IX Header "RETURN VALUES"
|
||
|
|
\&\fIOSSL_PROVIDER_set_default_search_path()\fR, \fIOSSL_PROVIDER_add()\fR,
|
||
|
|
\&\fIOSSL_PROVIDER_unload()\fR, \fIOSSL_PROVIDER_get_params()\fR and
|
||
|
|
\&\fIOSSL_PROVIDER_get_capabilities()\fR return 1 on success, or 0 on error.
|
||
|
|
.PP
|
||
|
|
\&\fIOSSL_PROVIDER_get0_default_search_path()\fR returns a pointer to a path on success,
|
||
|
|
or \s-1NULL\s0 on error or if the path has not previously been set.
|
||
|
|
.PP
|
||
|
|
\&\fIOSSL_PROVIDER_load()\fR and \fIOSSL_PROVIDER_try_load()\fR return a pointer to a
|
||
|
|
provider object on success, or \s-1NULL\s0 on error.
|
||
|
|
.PP
|
||
|
|
\&\fIOSSL_PROVIDER_do_all()\fR returns 1 if the callback \fIcb\fR returns 1 for every
|
||
|
|
provider it is called with, or 0 if any provider callback invocation returns 0;
|
||
|
|
callback processing stops at the first callback invocation on a provider
|
||
|
|
that returns 0.
|
||
|
|
.PP
|
||
|
|
\&\fIOSSL_PROVIDER_available()\fR returns 1 if the named provider is available,
|
||
|
|
otherwise 0.
|
||
|
|
.PP
|
||
|
|
\&\fIOSSL_PROVIDER_gettable_params()\fR returns a pointer to an array
|
||
|
|
of constant \s-1\fIOSSL_PARAM\s0\fR\|(3), or \s-1NULL\s0 if none is provided.
|
||
|
|
.PP
|
||
|
|
\&\fIOSSL_PROVIDER_get_params()\fR and returns 1 on success, or 0 on error.
|
||
|
|
.PP
|
||
|
|
\&\fIOSSL_PROVIDER_query_operation()\fR returns an array of \s-1OSSL_ALGORITHM\s0 or \s-1NULL\s0 on
|
||
|
|
error.
|
||
|
|
.PP
|
||
|
|
\&\fIOSSL_PROVIDER_self_test()\fR returns 1 if the self tests pass, or 0 on error.
|
||
|
|
.SH "EXAMPLES"
|
||
|
|
.IX Header "EXAMPLES"
|
||
|
|
This demonstrates how to load the provider module \*(L"foo\*(R" and ask for
|
||
|
|
its build information.
|
||
|
|
.PP
|
||
|
|
.Vb 3
|
||
|
|
\& #include <openssl/params.h>
|
||
|
|
\& #include <openssl/provider.h>
|
||
|
|
\& #include <openssl/err.h>
|
||
|
|
\&
|
||
|
|
\& OSSL_PROVIDER *prov = NULL;
|
||
|
|
\& const char *build = NULL;
|
||
|
|
\& OSSL_PARAM request[] = {
|
||
|
|
\& { "buildinfo", OSSL_PARAM_UTF8_PTR, &build, 0, 0 },
|
||
|
|
\& { NULL, 0, NULL, 0, 0 }
|
||
|
|
\& };
|
||
|
|
\&
|
||
|
|
\& if ((prov = OSSL_PROVIDER_load(NULL, "foo")) != NULL
|
||
|
|
\& && OSSL_PROVIDER_get_params(prov, request))
|
||
|
|
\& printf("Provider \*(Aqfoo\*(Aq buildinfo: %s\en", build);
|
||
|
|
\& else
|
||
|
|
\& ERR_print_errors_fp(stderr);
|
||
|
|
.Ve
|
||
|
|
.SH "SEE ALSO"
|
||
|
|
.IX Header "SEE ALSO"
|
||
|
|
\&\fIopenssl\-core.h\fR\|(7), \s-1\fIOSSL_LIB_CTX\s0\fR\|(3), \fIprovider\fR\|(7)
|
||
|
|
.SH "HISTORY"
|
||
|
|
.IX Header "HISTORY"
|
||
|
|
The type and functions described here were added in OpenSSL 3.0.
|
||
|
|
.PP
|
||
|
|
The \fIOSSL_PROVIDER_load_ex\fR and \fIOSSL_PROVIDER_try_load_ex\fR functions were
|
||
|
|
added in OpenSSL 3.2.
|
||
|
|
.SH "COPYRIGHT"
|
||
|
|
.IX Header "COPYRIGHT"
|
||
|
|
Copyright 2019\-2023 The OpenSSL Project Authors. All Rights Reserved.
|
||
|
|
.PP
|
||
|
|
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>.
|