431 lines
18 KiB
Plaintext
431 lines
18 KiB
Plaintext
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.\" ========================================================================
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.\"
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.IX Title "PROVIDER-ENCODER 7ossl"
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.TH PROVIDER-ENCODER 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\-encoder \- The OSSL_ENCODER 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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\& /* Encoder parameter accessor and descriptor */
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\& const OSSL_PARAM *OSSL_FUNC_encoder_gettable_params(void *provctx);
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\& int OSSL_FUNC_encoder_get_params(OSSL_PARAM params[]);
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\&
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\& /* Functions to construct / destruct / manipulate the encoder context */
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\& void *OSSL_FUNC_encoder_newctx(void *provctx);
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\& void OSSL_FUNC_encoder_freectx(void *ctx);
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\& int OSSL_FUNC_encoder_set_ctx_params(void *ctx, const OSSL_PARAM params[]);
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\& const OSSL_PARAM *OSSL_FUNC_encoder_settable_ctx_params(void *provctx);
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\&
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\& /* Functions to check selection support */
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\& int OSSL_FUNC_encoder_does_selection(void *provctx, int selection);
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\&
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\& /* Functions to encode object data */
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\& int OSSL_FUNC_encoder_encode(void *ctx, OSSL_CORE_BIO *out,
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\& const void *obj_raw,
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\& const OSSL_PARAM obj_abstract[],
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\& int selection,
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\& OSSL_PASSPHRASE_CALLBACK *cb,
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\& void *cbarg);
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\&
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\& /* Functions to import and free a temporary object to be encoded */
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\& void *OSSL_FUNC_encoder_import_object(void *ctx, int selection,
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\& const OSSL_PARAM params[]);
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\& void OSSL_FUNC_encoder_free_object(void *obj);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fIWe use the wide term \*(L"encode\*(R" in this manual. This includes but is
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not limited to serialization.\fR
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.PP
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The \s-1ENCODER\s0 operation is a generic method to encode a provider-native
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object (\fIobj_raw\fR) or an object abstraction (\fIobject_abstract\fR, see
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\&\fIprovider\-object\fR\|(7)) into an encoded form, and write the result to
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the given \s-1OSSL_CORE_BIO. \s0 If the caller wants to get the encoded
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stream to memory, it should provide a \fIBIO_s_mem\fR\|(3) \fB\s-1BIO\s0\fR.
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.PP
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The encoder doesn't need to know more about the \fB\s-1OSSL_CORE_BIO\s0\fR
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pointer than being able to pass it to the appropriate \s-1BIO\s0 upcalls (see
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\&\*(L"Core functions\*(R" in \fIprovider\-base\fR\|(7)).
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.PP
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The \s-1ENCODER\s0 implementation may be part of a chain, where data is
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passed from one to the next. For example, there may be an
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implementation to encode an object to \s-1DER \s0(that object is assumed to
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be provider-native and thereby passed via \fIobj_raw\fR), and another one
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that encodes \s-1DER\s0 to \s-1PEM \s0(that one would receive the \s-1DER\s0 encoding via
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\&\fIobj_abstract\fR).
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.PP
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The encoding using the \s-1\fIOSSL_PARAM\s0\fR\|(3) array form allows a
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encoder to be used for data that's been exported from another
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provider, and thereby allow them to exist independently of each
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other.
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.PP
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The encoding using a provider side object can only be safely used
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with provider data coming from the same provider, for example keys
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with the \s-1KEYMGMT\s0 provider.
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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
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named \fBOSSL_FUNC_{name}_fn\fR, and a helper function to retrieve the
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function pointer from an \s-1\fIOSSL_DISPATCH\s0\fR\|(3) element named
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\&\fBOSSL_FUNC_{name}\fR.
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For example, the \*(L"function\*(R" \fIOSSL_FUNC_encoder_encode()\fR has these:
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.PP
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.Vb 8
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\& typedef int
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\& (OSSL_FUNC_encoder_encode_fn)(void *ctx, OSSL_CORE_BIO *out,
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\& const void *obj_raw,
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\& const OSSL_PARAM obj_abstract[],
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\& int selection,
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\& OSSL_PASSPHRASE_CALLBACK *cb, void *cbarg);
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\& static ossl_inline OSSL_FUNC_encoder_encode_fn
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\& OSSL_FUNC_encoder_encode(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
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macros in \fIopenssl\-core_dispatch.h\fR\|(7), as follows:
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.PP
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.Vb 2
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\& OSSL_FUNC_encoder_get_params OSSL_FUNC_ENCODER_GET_PARAMS
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\& OSSL_FUNC_encoder_gettable_params OSSL_FUNC_ENCODER_GETTABLE_PARAMS
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\&
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\& OSSL_FUNC_encoder_newctx OSSL_FUNC_ENCODER_NEWCTX
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\& OSSL_FUNC_encoder_freectx OSSL_FUNC_ENCODER_FREECTX
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\& OSSL_FUNC_encoder_set_ctx_params OSSL_FUNC_ENCODER_SET_CTX_PARAMS
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\& OSSL_FUNC_encoder_settable_ctx_params OSSL_FUNC_ENCODER_SETTABLE_CTX_PARAMS
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\&
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\& OSSL_FUNC_encoder_does_selection OSSL_FUNC_ENCODER_DOES_SELECTION
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\&
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\& OSSL_FUNC_encoder_encode OSSL_FUNC_ENCODER_ENCODE
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\&
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\& OSSL_FUNC_encoder_import_object OSSL_FUNC_ENCODER_IMPORT_OBJECT
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\& OSSL_FUNC_encoder_free_object OSSL_FUNC_ENCODER_FREE_OBJECT
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.Ve
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.SS "Names and properties"
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.IX Subsection "Names and properties"
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The name of an implementation should match the type of object it handles.
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For example, an implementation that encodes an \s-1RSA\s0 key should be named \*(L"\s-1RSA\*(R".\s0
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Likewise, an implementation that further encodes \s-1DER\s0 should be named \*(L"\s-1DER\*(R".\s0
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.PP
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Properties can be used to further specify details about an implementation:
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.IP "output" 4
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.IX Item "output"
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This property is used to specify what type of output the implementation
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produces.
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.Sp
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This property is \fImandatory\fR.
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.Sp
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OpenSSL providers recognize the following output types:
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.RS 4
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.IP "text" 4
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.IX Item "text"
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An implementation with that output type outputs human readable text, making
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that implementation suitable for \f(CW\*(C`\-text\*(C'\fR output in diverse \fIopenssl\fR\|(1)
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commands.
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.IP "pem" 4
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.IX Item "pem"
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An implementation with that output type outputs \s-1PEM\s0 formatted data.
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.IP "der" 4
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.IX Item "der"
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An implementation with that output type outputs \s-1DER\s0 formatted data.
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.IP "msblob" 4
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.IX Item "msblob"
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An implementation with that output type outputs \s-1MSBLOB\s0 formatted data.
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.IP "pvk" 4
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.IX Item "pvk"
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An implementation with that output type outputs \s-1PVK\s0 formatted data.
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.RE
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.RS 4
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.RE
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.IP "structure" 4
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.IX Item "structure"
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This property is used to specify the structure that is used for the encoded
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object. An example could be \f(CW\*(C`pkcs8\*(C'\fR, to specify explicitly that an object
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(presumably an asymmetric key pair, in this case) will be wrapped in a
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PKCS#8 structure as part of the encoding.
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.Sp
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This property is \fIoptional\fR.
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.PP
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The possible values of both these properties is open ended. A provider may
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very well specify output types and structures that libcrypto doesn't know
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anything about.
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.SS "Subset selections"
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.IX Subsection "Subset selections"
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Sometimes, an object has more than one subset of data that is interesting to
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treat separately or together. It's possible to specify what subsets are to
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be encoded, with a set of bits \fIselection\fR that are passed in an \fBint\fR.
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.PP
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|
|
This set of bits depend entirely on what kind of provider-side object is
|
||
|
|
passed. For example, those bits are assumed to be the same as those used
|
||
|
|
with \fIprovider\-keymgmt\fR\|(7) (see \*(L"Key Objects\*(R" in \fIprovider\-keymgmt\fR\|(7)) when
|
||
|
|
the object is an asymmetric keypair.
|
||
|
|
.PP
|
||
|
|
\&\s-1ENCODER\s0 implementations are free to regard the \fIselection\fR as a set of
|
||
|
|
hints, but must do so with care. In the end, the output must make sense,
|
||
|
|
and if there's a corresponding decoder, the resulting decoded object must
|
||
|
|
match the original object that was encoded.
|
||
|
|
.PP
|
||
|
|
\&\fIOSSL_FUNC_encoder_does_selection()\fR should tell if a particular implementation
|
||
|
|
supports any of the combinations given by \fIselection\fR.
|
||
|
|
.SS "Context functions"
|
||
|
|
.IX Subsection "Context functions"
|
||
|
|
\&\fIOSSL_FUNC_encoder_newctx()\fR returns a context to be used with the rest of
|
||
|
|
the functions.
|
||
|
|
.PP
|
||
|
|
\&\fIOSSL_FUNC_encoder_freectx()\fR frees the given \fIctx\fR, if it was created by
|
||
|
|
\&\fIOSSL_FUNC_encoder_newctx()\fR.
|
||
|
|
.PP
|
||
|
|
\&\fIOSSL_FUNC_encoder_set_ctx_params()\fR sets context data according to parameters
|
||
|
|
from \fIparams\fR that it recognises. Unrecognised parameters should be
|
||
|
|
ignored.
|
||
|
|
Passing \s-1NULL\s0 for \fIparams\fR should return true.
|
||
|
|
.PP
|
||
|
|
\&\fIOSSL_FUNC_encoder_settable_ctx_params()\fR returns a constant \s-1\fIOSSL_PARAM\s0\fR\|(3)
|
||
|
|
array describing the parameters that \fIOSSL_FUNC_encoder_set_ctx_params()\fR
|
||
|
|
can handle.
|
||
|
|
.PP
|
||
|
|
See \s-1\fIOSSL_PARAM\s0\fR\|(3) for further details on the parameters structure used by
|
||
|
|
\&\fIOSSL_FUNC_encoder_set_ctx_params()\fR and \fIOSSL_FUNC_encoder_settable_ctx_params()\fR.
|
||
|
|
.SS "Import functions"
|
||
|
|
.IX Subsection "Import functions"
|
||
|
|
A provider-native object may be associated with a foreign provider, and may
|
||
|
|
therefore be unsuitable for direct use with a given \s-1ENCODER\s0 implementation.
|
||
|
|
Provided that the foreign provider's implementation to handle the object has
|
||
|
|
a function to export that object in \s-1\fIOSSL_PARAM\s0\fR\|(3) array form, the \s-1ENCODER\s0
|
||
|
|
implementation should be able to import that array and create a suitable
|
||
|
|
object to be passed to \fIOSSL_FUNC_encoder_encode()\fR's \fIobj_raw\fR.
|
||
|
|
.PP
|
||
|
|
\&\fIOSSL_FUNC_encoder_import_object()\fR should import the subset of \fIparams\fR
|
||
|
|
given with \fIselection\fR to create a provider-native object that can be
|
||
|
|
passed as \fIobj_raw\fR to \fIOSSL_FUNC_encoder_encode()\fR.
|
||
|
|
.PP
|
||
|
|
\&\fIOSSL_FUNC_encoder_free_object()\fR should free the object that was created with
|
||
|
|
\&\fIOSSL_FUNC_encoder_import_object()\fR.
|
||
|
|
.SS "Encoding functions"
|
||
|
|
.IX Subsection "Encoding functions"
|
||
|
|
\&\fIOSSL_FUNC_encoder_encode()\fR should take a provider-native object (in
|
||
|
|
\&\fIobj_raw\fR) or an object abstraction (in \fIobj_abstract\fR), and should output
|
||
|
|
the object in encoded form to the \fB\s-1OSSL_CORE_BIO\s0\fR. The \fIselection\fR bits,
|
||
|
|
if relevant, should determine in greater detail what will be output.
|
||
|
|
The encoding functions also take an \s-1\fIOSSL_PASSPHRASE_CALLBACK\s0\fR\|(3) function
|
||
|
|
pointer along with a pointer to application data \fIcbarg\fR, which should be
|
||
|
|
used when a pass phrase prompt is needed.
|
||
|
|
.SS "Encoder operation parameters"
|
||
|
|
.IX Subsection "Encoder operation parameters"
|
||
|
|
Operation parameters currently recognised by built-in encoders are as
|
||
|
|
follows:
|
||
|
|
.ie n .IP """cipher"" (\fB\s-1OSSL_ENCODER_PARAM_CIPHER\s0\fR) <\s-1UTF8\s0 string>" 4
|
||
|
|
.el .IP "``cipher'' (\fB\s-1OSSL_ENCODER_PARAM_CIPHER\s0\fR) <\s-1UTF8\s0 string>" 4
|
||
|
|
.IX Item "cipher (OSSL_ENCODER_PARAM_CIPHER) <UTF8 string>"
|
||
|
|
The name of the encryption cipher to be used when generating encrypted
|
||
|
|
encoding. This is used when encoding private keys, as well as
|
||
|
|
other objects that need protection.
|
||
|
|
.Sp
|
||
|
|
If this name is invalid for the encoding implementation, the
|
||
|
|
implementation should refuse to perform the encoding, i.e.
|
||
|
|
\&\fIOSSL_FUNC_encoder_encode_data()\fR and \fIOSSL_FUNC_encoder_encode_object()\fR
|
||
|
|
should return an error.
|
||
|
|
.ie n .IP """properties"" (\fB\s-1OSSL_ENCODER_PARAM_PROPERTIES\s0\fR) <\s-1UTF8\s0 string>" 4
|
||
|
|
.el .IP "``properties'' (\fB\s-1OSSL_ENCODER_PARAM_PROPERTIES\s0\fR) <\s-1UTF8\s0 string>" 4
|
||
|
|
.IX Item "properties (OSSL_ENCODER_PARAM_PROPERTIES) <UTF8 string>"
|
||
|
|
The properties to be queried when trying to fetch the algorithm given
|
||
|
|
with the \*(L"cipher\*(R" parameter.
|
||
|
|
This must be given together with the \*(L"cipher\*(R" parameter to be
|
||
|
|
considered valid.
|
||
|
|
.Sp
|
||
|
|
The encoding implementation isn't obligated to use this value.
|
||
|
|
However, it is recommended that implementations that do not handle
|
||
|
|
property strings return an error on receiving this parameter unless
|
||
|
|
its value \s-1NULL\s0 or the empty string.
|
||
|
|
.ie n .IP """save-parameters"" (\fB\s-1OSSL_ENCODER_PARAM_SAVE_PARAMETERS\s0\fR) <integer>" 4
|
||
|
|
.el .IP "``save-parameters'' (\fB\s-1OSSL_ENCODER_PARAM_SAVE_PARAMETERS\s0\fR) <integer>" 4
|
||
|
|
.IX Item "save-parameters (OSSL_ENCODER_PARAM_SAVE_PARAMETERS) <integer>"
|
||
|
|
If set to 0 disables saving of key domain parameters. Default is 1.
|
||
|
|
It currently has an effect only on \s-1DSA\s0 keys.
|
||
|
|
.PP
|
||
|
|
Parameters currently recognised by the built-in pass phrase callback:
|
||
|
|
.ie n .IP """info"" (\fB\s-1OSSL_PASSPHRASE_PARAM_INFO\s0\fR) <\s-1UTF8\s0 string>" 4
|
||
|
|
.el .IP "``info'' (\fB\s-1OSSL_PASSPHRASE_PARAM_INFO\s0\fR) <\s-1UTF8\s0 string>" 4
|
||
|
|
.IX Item "info (OSSL_PASSPHRASE_PARAM_INFO) <UTF8 string>"
|
||
|
|
A string of information that will become part of the pass phrase
|
||
|
|
prompt. This could be used to give the user information on what kind
|
||
|
|
of object it's being prompted for.
|
||
|
|
.SH "RETURN VALUES"
|
||
|
|
.IX Header "RETURN VALUES"
|
||
|
|
\&\fIOSSL_FUNC_encoder_newctx()\fR returns a pointer to a context, or \s-1NULL\s0 on
|
||
|
|
failure.
|
||
|
|
.PP
|
||
|
|
\&\fIOSSL_FUNC_encoder_set_ctx_params()\fR returns 1, unless a recognised
|
||
|
|
parameter was invalid or caused an error, for which 0 is returned.
|
||
|
|
.PP
|
||
|
|
\&\fIOSSL_FUNC_encoder_settable_ctx_params()\fR returns a pointer to an array of
|
||
|
|
constant \s-1\fIOSSL_PARAM\s0\fR\|(3) elements.
|
||
|
|
.PP
|
||
|
|
\&\fIOSSL_FUNC_encoder_does_selection()\fR returns 1 if the encoder implementation
|
||
|
|
supports any of the \fIselection\fR bits, otherwise 0.
|
||
|
|
.PP
|
||
|
|
\&\fIOSSL_FUNC_encoder_encode()\fR returns 1 on success, or 0 on failure.
|
||
|
|
.SH "SEE ALSO"
|
||
|
|
.IX Header "SEE ALSO"
|
||
|
|
\&\fIprovider\fR\|(7)
|
||
|
|
.SH "HISTORY"
|
||
|
|
.IX Header "HISTORY"
|
||
|
|
The \s-1ENCODER\s0 interface was introduced in OpenSSL 3.0.
|
||
|
|
.SH "COPYRIGHT"
|
||
|
|
.IX Header "COPYRIGHT"
|
||
|
|
Copyright 2019\-2021 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>.
|