357 lines
15 KiB
Plaintext
357 lines
15 KiB
Plaintext
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.\" ========================================================================
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.\"
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.IX Title "PROVIDER-STOREMGMT 7ossl"
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.TH PROVIDER-STOREMGMT 7ossl "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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provider\-storemgmt \- The OSSL_STORE library <\-> provider functions
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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/core_dispatch.h>
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\&
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\& /*
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\& * None of these are actual functions, but are displayed like this for
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\& * the function signatures for functions that are offered as function
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\& * pointers in OSSL_DISPATCH arrays.
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\& */
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\&
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\& void *OSSL_FUNC_store_open(void *provctx, const char *uri);
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\& void *OSSL_FUNC_store_attach(void *provctx, OSSL_CORE_BIO *bio);
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\& const OSSL_PARAM *store_settable_ctx_params(void *provctx);
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\& int OSSL_FUNC_store_set_ctx_params(void *loaderctx, const OSSL_PARAM[]);
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\& int OSSL_FUNC_store_load(void *loaderctx,
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\& OSSL_CALLBACK *object_cb, void *object_cbarg,
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\& OSSL_PASSPHRASE_CALLBACK *pw_cb, void *pw_cbarg);
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\& int OSSL_FUNC_store_eof(void *loaderctx);
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\& int OSSL_FUNC_store_close(void *loaderctx);
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\&
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\& int OSSL_FUNC_store_export_object
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\& (void *loaderctx, const void *objref, size_t objref_sz,
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\& OSSL_CALLBACK *export_cb, void *export_cbarg);
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\& void *OSSL_FUNC_store_open_ex(void *provctx, const char *uri,
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\& const OSSL_PARAM params[],
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\& OSSL_PASSPHRASE_CALLBACK *pw_cb,
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\& void *pw_cbarg);
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\&
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\& int OSSL_FUNC_store_delete(void *provctx, const char *uri,
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\& const OSSL_PARAM params[],
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\& OSSL_PASSPHRASE_CALLBACK *pw_cb, void *pw_cbarg);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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The \s-1STORE\s0 operation is the provider side of the \fIossl_store\fR\|(7) \s-1API.\s0
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.PP
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The primary responsibility of the \s-1STORE\s0 operation is to load all sorts
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of objects from a container indicated by \s-1URI. \s0 These objects are given
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to the OpenSSL library in provider-native object abstraction form (see
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\&\fIprovider\-object\fR\|(7)). The OpenSSL library is then responsible for
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passing on that abstraction to suitable provided functions.
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.PP
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Examples of functions that the OpenSSL library can pass the abstraction to
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include \fIOSSL_FUNC_keymgmt_load()\fR (\fIprovider\-keymgmt\fR\|(7)),
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\&\fIOSSL_FUNC_store_export_object()\fR (which exports the object in parameterized
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form).
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.PP
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All \*(L"functions\*(R" mentioned here are passed as function pointers between
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\&\fIlibcrypto\fR and the provider in \s-1\fIOSSL_DISPATCH\s0\fR\|(3) arrays via
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\&\s-1\fIOSSL_ALGORITHM\s0\fR\|(3) arrays that are returned by the provider's
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\&\fIprovider_query_operation()\fR function
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(see \*(L"Provider Functions\*(R" in \fIprovider\-base\fR\|(7)).
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.PP
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All these \*(L"functions\*(R" have a corresponding function type definition named
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\&\fBOSSL_FUNC_{name}_fn\fR, and a helper function to retrieve the function pointer
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from a \s-1\fIOSSL_DISPATCH\s0\fR\|(3) element named \fBOSSL_get_{name}\fR.
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For example, the \*(L"function\*(R" \fIOSSL_FUNC_store_attach()\fR has these:
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.PP
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.Vb 4
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\& typedef void *(OSSL_FUNC_store_attach_fn)(void *provctx,
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\& OSSL_CORE_BIO * bio);
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\& static ossl_inline OSSL_FUNC_store_attach_fn
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\& OSSL_FUNC_store_attach(const OSSL_DISPATCH *opf);
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.Ve
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.PP
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\&\s-1\fIOSSL_DISPATCH\s0\fR\|(3) arrays are indexed by numbers that are provided as macros
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in \fIopenssl\-core_dispatch.h\fR\|(7), as follows:
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.PP
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.Vb 10
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\& OSSL_FUNC_store_open OSSL_FUNC_STORE_OPEN
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\& OSSL_FUNC_store_attach OSSL_FUNC_STORE_ATTACH
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\& OSSL_FUNC_store_settable_ctx_params OSSL_FUNC_STORE_SETTABLE_CTX_PARAMS
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\& OSSL_FUNC_store_set_ctx_params OSSL_FUNC_STORE_SET_CTX_PARAMS
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\& OSSL_FUNC_store_load OSSL_FUNC_STORE_LOAD
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\& OSSL_FUNC_store_eof OSSL_FUNC_STORE_EOF
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\& OSSL_FUNC_store_close OSSL_FUNC_STORE_CLOSE
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\& OSSL_FUNC_store_export_object OSSL_FUNC_STORE_EXPORT_OBJECT
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\& OSSL_FUNC_store_delete OSSL_FUNC_STORE_DELETE
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\& OSSL_FUNC_store_open_ex OSSL_FUNC_STORE_OPEN_EX
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.Ve
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.SS "Functions"
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.IX Subsection "Functions"
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\&\fIOSSL_FUNC_store_open()\fR should create a provider side context with data based
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on the input \fIuri\fR. The implementation is entirely responsible for the
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interpretation of the \s-1URI.\s0
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.PP
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\&\fIOSSL_FUNC_store_attach()\fR should create a provider side context with the core
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\&\fB\s-1BIO\s0\fR \fIbio\fR attached. This is an alternative to using a \s-1URI\s0 to find storage,
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supporting \fIOSSL_STORE_attach\fR\|(3).
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.PP
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\&\fIOSSL_FUNC_store_settable_ctx_params()\fR should return a constant array of
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descriptor \s-1\fIOSSL_PARAM\s0\fR\|(3), for parameters that \fIOSSL_FUNC_store_set_ctx_params()\fR
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can handle.
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.PP
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\&\fIOSSL_FUNC_store_set_ctx_params()\fR should set additional parameters, such as what
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kind of data to expect, search criteria, and so on. More on those below, in
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\&\*(L"Load Parameters\*(R". Whether unrecognised parameters are an error or simply
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ignored is at the implementation's discretion.
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Passing \s-1NULL\s0 for \fIparams\fR should return true.
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.PP
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\&\fIOSSL_FUNC_store_load()\fR loads the next object from the \s-1URI\s0 opened by
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\&\fIOSSL_FUNC_store_open()\fR, creates an object abstraction for it (see
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\&\fIprovider\-object\fR\|(7)), and calls \fIobject_cb\fR with it as well as
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\&\fIobject_cbarg\fR. \fIobject_cb\fR will then interpret the object abstraction
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and do what it can to wrap it or decode it into an OpenSSL structure. In
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case a passphrase needs to be prompted to unlock an object, \fIpw_cb\fR should
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be called.
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.PP
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\&\fIOSSL_FUNC_store_eof()\fR indicates if the end of the set of objects from the
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\&\s-1URI\s0 has been reached. When that happens, there's no point trying to do any
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further loading.
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.PP
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\&\fIOSSL_FUNC_store_close()\fR frees the provider side context \fIctx\fR.
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.PP
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When a provider-native object is created by a store manager it would be unsuitable
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for direct use with a foreign provider. The export function allows for
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exporting the object to that foreign provider if the foreign provider
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supports the type of the object and provides an import function.
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.PP
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\&\fIOSSL_FUNC_store_export_object()\fR should export the object of size \fIobjref_sz\fR
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referenced by \fIobjref\fR as an \s-1\fIOSSL_PARAM\s0\fR\|(3) array and pass that to the
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\&\fIexport_cb\fR as well as the given \fIexport_cbarg\fR.
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.PP
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\&\fIOSSL_FUNC_store_delete()\fR deletes the object identified by the \fIuri\fR. The
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implementation is entirely responsible for the interpretation of the \s-1URI. \s0 In
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case a passphrase needs to be prompted to remove an object, \fIpw_cb\fR should be
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called.
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.PP
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\&\fIOSSL_FUNC_store_open_ex()\fR is an extended variant of \fIOSSL_FUNC_store_open()\fR. If
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the provider does not implement this function the code internally falls back to
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use the original \fIOSSL_FUNC_store_open()\fR.
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This variant additionally accepts an \s-1\fIOSSL_PARAM\s0\fR\|(3) object and a \fIpw_cb\fR
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callback that can be used to request a passphrase in cases where the whole
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store needs to be unlocked before performing any load operation.
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.SS "Load Parameters"
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.IX Subsection "Load Parameters"
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.ie n .IP """expect"" (\fB\s-1OSSL_STORE_PARAM_EXPECT\s0\fR) <integer>" 4
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.el .IP "``expect'' (\fB\s-1OSSL_STORE_PARAM_EXPECT\s0\fR) <integer>" 4
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.IX Item "expect (OSSL_STORE_PARAM_EXPECT) <integer>"
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Is a hint of what type of data the OpenSSL library expects to get.
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This is only useful for optimization, as the library will check that the
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object types match the expectation too.
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.Sp
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The number that can be given through this parameter is found in
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\&\fI<openssl/store.h>\fR, with the macros having names starting with
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\&\f(CW\*(C`OSSL_STORE_INFO_\*(C'\fR. These are further described in
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\&\*(L"\s-1SUPPORTED OBJECTS\*(R"\s0 in \s-1\fIOSSL_STORE_INFO\s0\fR\|(3).
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.ie n .IP """subject"" (\fB\s-1OSSL_STORE_PARAM_SUBJECT\s0\fR) <octet string>" 4
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.el .IP "``subject'' (\fB\s-1OSSL_STORE_PARAM_SUBJECT\s0\fR) <octet string>" 4
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.IX Item "subject (OSSL_STORE_PARAM_SUBJECT) <octet string>"
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Indicates that the caller wants to search for an object with the given
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subject associated. This can be used to select specific certificates
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by subject.
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.Sp
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The contents of the octet string is expected to be in \s-1DER\s0 form.
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.ie n .IP """issuer"" (\fB\s-1OSSL_STORE_PARAM_ISSUER\s0\fR) <octet string>" 4
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.el .IP "``issuer'' (\fB\s-1OSSL_STORE_PARAM_ISSUER\s0\fR) <octet string>" 4
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.IX Item "issuer (OSSL_STORE_PARAM_ISSUER) <octet string>"
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Indicates that the caller wants to search for an object with the given
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issuer associated. This can be used to select specific certificates
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by issuer.
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.Sp
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The contents of the octet string is expected to be in \s-1DER\s0 form.
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.ie n .IP """serial"" (\fB\s-1OSSL_STORE_PARAM_SERIAL\s0\fR) <integer>" 4
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.el .IP "``serial'' (\fB\s-1OSSL_STORE_PARAM_SERIAL\s0\fR) <integer>" 4
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.IX Item "serial (OSSL_STORE_PARAM_SERIAL) <integer>"
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Indicates that the caller wants to search for an object with the given
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serial number associated.
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.ie n .IP """digest"" (\fB\s-1OSSL_STORE_PARAM_DIGEST\s0\fR) <\s-1UTF8\s0 string>" 4
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.el .IP "``digest'' (\fB\s-1OSSL_STORE_PARAM_DIGEST\s0\fR) <\s-1UTF8\s0 string>" 4
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.IX Item "digest (OSSL_STORE_PARAM_DIGEST) <UTF8 string>"
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.PD 0
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.ie n .IP """fingerprint"" (\fB\s-1OSSL_STORE_PARAM_FINGERPRINT\s0\fR) <octet string>" 4
|
||
|
.el .IP "``fingerprint'' (\fB\s-1OSSL_STORE_PARAM_FINGERPRINT\s0\fR) <octet string>" 4
|
||
|
.IX Item "fingerprint (OSSL_STORE_PARAM_FINGERPRINT) <octet string>"
|
||
|
.PD
|
||
|
Indicates that the caller wants to search for an object with the given
|
||
|
fingerprint, computed with the given digest.
|
||
|
.ie n .IP """alias"" (\fB\s-1OSSL_STORE_PARAM_ALIAS\s0\fR) <\s-1UTF8\s0 string>" 4
|
||
|
.el .IP "``alias'' (\fB\s-1OSSL_STORE_PARAM_ALIAS\s0\fR) <\s-1UTF8\s0 string>" 4
|
||
|
.IX Item "alias (OSSL_STORE_PARAM_ALIAS) <UTF8 string>"
|
||
|
Indicates that the caller wants to search for an object with the given
|
||
|
alias (some call it a \*(L"friendly name\*(R").
|
||
|
.ie n .IP """properties"" (\fB\s-1OSSL_STORE_PARAM_PROPERTIES\s0\fR) <utf8 string>" 4
|
||
|
.el .IP "``properties'' (\fB\s-1OSSL_STORE_PARAM_PROPERTIES\s0\fR) <utf8 string>" 4
|
||
|
.IX Item "properties (OSSL_STORE_PARAM_PROPERTIES) <utf8 string>"
|
||
|
Property string to use when querying for algorithms such as the \fB\s-1OSSL_DECODER\s0\fR
|
||
|
decoder implementations.
|
||
|
.ie n .IP """input-type"" (\fB\s-1OSSL_STORE_PARAM_INPUT_TYPE\s0\fR) <utf8 string>" 4
|
||
|
.el .IP "``input-type'' (\fB\s-1OSSL_STORE_PARAM_INPUT_TYPE\s0\fR) <utf8 string>" 4
|
||
|
.IX Item "input-type (OSSL_STORE_PARAM_INPUT_TYPE) <utf8 string>"
|
||
|
Type of the input format as a hint to use when decoding the objects in the
|
||
|
store.
|
||
|
.PP
|
||
|
Several of these search criteria may be combined. For example, to
|
||
|
search for a certificate by issuer+serial, both the \*(L"issuer\*(R" and the
|
||
|
\&\*(L"serial\*(R" parameters will be given.
|
||
|
.SH "SEE ALSO"
|
||
|
.IX Header "SEE ALSO"
|
||
|
\&\fIprovider\fR\|(7)
|
||
|
.SH "HISTORY"
|
||
|
.IX Header "HISTORY"
|
||
|
The \s-1STORE\s0 interface was introduced in OpenSSL 3.0.
|
||
|
.PP
|
||
|
\&\fIOSSL_FUNC_store_delete()\fR callback was added in OpenSSL 3.2
|
||
|
.SH "COPYRIGHT"
|
||
|
.IX Header "COPYRIGHT"
|
||
|
Copyright 2020\-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>.
|