422 lines
16 KiB
Plaintext
422 lines
16 KiB
Plaintext
.\" Automatically generated by Pod::Man 2.27 (Pod::Simple 3.28)
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.\" ========================================================================
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.\"
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.IX Title "PROVIDER-DECODER 7ossl"
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.TH PROVIDER-DECODER 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\-decoder \- The OSSL_DECODER 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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\& /* Decoder parameter accessor and descriptor */
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\& const OSSL_PARAM *OSSL_FUNC_decoder_gettable_params(void *provctx);
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\& int OSSL_FUNC_decoder_get_params(OSSL_PARAM params[]);
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\&
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\& /* Functions to construct / destruct / manipulate the decoder context */
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\& void *OSSL_FUNC_decoder_newctx(void *provctx);
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\& void OSSL_FUNC_decoder_freectx(void *ctx);
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\& const OSSL_PARAM *OSSL_FUNC_decoder_settable_ctx_params(void *provctx);
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\& int OSSL_FUNC_decoder_set_ctx_params(void *ctx, const OSSL_PARAM params[]);
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\&
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\& /* Functions to check selection support */
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\& int OSSL_FUNC_decoder_does_selection(void *provctx, int selection);
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\&
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\& /* Functions to decode object data */
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\& int OSSL_FUNC_decoder_decode(void *ctx, OSSL_CORE_BIO *in,
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\& int selection,
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\& OSSL_CALLBACK *data_cb, void *data_cbarg,
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\& OSSL_PASSPHRASE_CALLBACK *cb, void *cbarg);
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\&
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\& /* Functions to export a decoded object */
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\& int OSSL_FUNC_decoder_export_object(void *ctx,
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\& const void *objref, size_t objref_sz,
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\& OSSL_CALLBACK *export_cb,
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\& void *export_cbarg);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fIThe term \*(L"decode\*(R" is used throughout this manual. This includes but is
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not limited to deserialization as individual decoders can also do
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decoding into intermediate data formats.\fR
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.PP
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The \s-1DECODER\s0 operation is a generic method to create a provider-native
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object reference or intermediate decoded data from an encoded form
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read from the given \fB\s-1OSSL_CORE_BIO\s0\fR. If the caller wants to decode
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data from memory, it should provide a \fIBIO_s_mem\fR\|(3) \fB\s-1BIO\s0\fR. The decoded
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data or object reference is passed along with eventual metadata
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to the \fImetadata_cb\fR as \s-1\fIOSSL_PARAM\s0\fR\|(3) parameters.
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.PP
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The decoder 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-1DECODER\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 decode an object from \s-1PEM\s0 to \s-1DER,\s0 and another one
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that decodes \s-1DER\s0 to a provider-native object.
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.PP
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The last decoding step in the decoding chain is usually supposed to create
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a provider-native object referenced by an object reference. To import
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that object into a different provider the \fIOSSL_FUNC_decoder_export_object()\fR
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can be called as the final step of the decoding process.
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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_decoder_decode()\fR has these:
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.PP
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.Vb 7
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\& typedef int
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\& (OSSL_FUNC_decoder_decode_fn)(void *ctx, OSSL_CORE_BIO *in,
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\& int selection,
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\& OSSL_CALLBACK *data_cb, void *data_cbarg,
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\& OSSL_PASSPHRASE_CALLBACK *cb, void *cbarg);
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\& static ossl_inline OSSL_FUNC_decoder_decode_fn*
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\& OSSL_FUNC_decoder_decode(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_decoder_get_params OSSL_FUNC_DECODER_GET_PARAMS
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\& OSSL_FUNC_decoder_gettable_params OSSL_FUNC_DECODER_GETTABLE_PARAMS
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\&
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\& OSSL_FUNC_decoder_newctx OSSL_FUNC_DECODER_NEWCTX
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\& OSSL_FUNC_decoder_freectx OSSL_FUNC_DECODER_FREECTX
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\& OSSL_FUNC_decoder_set_ctx_params OSSL_FUNC_DECODER_SET_CTX_PARAMS
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\& OSSL_FUNC_decoder_settable_ctx_params OSSL_FUNC_DECODER_SETTABLE_CTX_PARAMS
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\&
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\& OSSL_FUNC_decoder_does_selection OSSL_FUNC_DECODER_DOES_SELECTION
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\&
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\& OSSL_FUNC_decoder_decode OSSL_FUNC_DECODER_DECODE
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\&
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\& OSSL_FUNC_decoder_export_object OSSL_FUNC_DECODER_EXPORT_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 target type of object
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it decodes. For example, an implementation that decodes an \s-1RSA\s0 key
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should be named \*(L"\s-1RSA\*(R".\s0 Likewise, an implementation that decodes \s-1DER\s0 data
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from \s-1PEM\s0 input 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 "input" 4
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.IX Item "input"
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This property is used to specify what format of input the implementation
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can decode.
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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 input types:
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.RS 4
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.IP "pem" 4
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.IX Item "pem"
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An implementation with that input type decodes \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 input type decodes \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 input type decodes \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 input type decodes \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 the decoded data is
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expected to have.
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.Sp
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This property is \fIoptional\fR.
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.Sp
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Structures currently recognised by built-in decoders:
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.RS 4
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.ie n .IP """type-specific""" 4
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.el .IP "``type-specific''" 4
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.IX Item "type-specific"
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Type specific structure.
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.ie n .IP """pkcs8""" 4
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.el .IP "``pkcs8''" 4
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.IX Item "pkcs8"
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Structure according to the PKCS#8 specification.
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.ie n .IP """SubjectPublicKeyInfo""" 4
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.el .IP "``SubjectPublicKeyInfo''" 4
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.IX Item "SubjectPublicKeyInfo"
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Encoding of public keys according to the Subject Public Key Info of \s-1RFC 5280.\s0
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.RE
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.RS 4
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.RE
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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 input 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 decoded, 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
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to be decoded. For example, those bits are assumed to be the same as those
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used with \fIprovider\-keymgmt\fR\|(7) (see \*(L"Key Objects\*(R" in \fIprovider\-keymgmt\fR\|(7)) when
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the object is an asymmetric keypair \- e.g., \fB\s-1OSSL_KEYMGMT_SELECT_PRIVATE_KEY\s0\fR
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if the object to be decoded is supposed to contain private key components.
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.PP
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\&\fIOSSL_FUNC_decoder_does_selection()\fR should tell if a particular implementation
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supports any of the combinations given by \fIselection\fR.
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.SS "Context functions"
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.IX Subsection "Context functions"
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\&\fIOSSL_FUNC_decoder_newctx()\fR returns a context to be used with the rest of
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the functions.
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.PP
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\&\fIOSSL_FUNC_decoder_freectx()\fR frees the given \fIctx\fR as created by
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\&\fIOSSL_FUNC_decoder_newctx()\fR.
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.PP
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\&\fIOSSL_FUNC_decoder_set_ctx_params()\fR sets context data according to parameters
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from \fIparams\fR that it recognises. Unrecognised parameters should be
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ignored.
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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_decoder_settable_ctx_params()\fR returns a constant \s-1\fIOSSL_PARAM\s0\fR\|(3)
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array describing the parameters that \fIOSSL_FUNC_decoder_set_ctx_params()\fR
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can handle.
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.PP
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See \s-1\fIOSSL_PARAM\s0\fR\|(3) for further details on the parameters structure used by
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\&\fIOSSL_FUNC_decoder_set_ctx_params()\fR and \fIOSSL_FUNC_decoder_settable_ctx_params()\fR.
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.SS "Export function"
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.IX Subsection "Export function"
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When a provider-native object is created by a decoder 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 into 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_decoder_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 into the
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\&\fIexport_cb\fR as well as the given \fIexport_cbarg\fR.
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.SS "Decoding functions"
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.IX Subsection "Decoding functions"
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\&\fIOSSL_FUNC_decoder_decode()\fR should decode the data as read from
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the \fB\s-1OSSL_CORE_BIO\s0\fR \fIin\fR to produce decoded data or an object to be
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passed as reference in an \s-1\fIOSSL_PARAM\s0\fR\|(3) array along with possible other
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metadata that was decoded from the input. This \s-1\fIOSSL_PARAM\s0\fR\|(3) array is
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then passed to the \fIdata_cb\fR callback. The \fIselection\fR bits,
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if relevant, should determine what the input data should contain.
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The decoding functions also take an \s-1\fIOSSL_PASSPHRASE_CALLBACK\s0\fR\|(3) function
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pointer along with a pointer to application data \fIcbarg\fR, which should be
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used when a pass phrase prompt is needed.
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.PP
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It's important to understand that the return value from this function is
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interpreted as follows:
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.IP "True (1)" 4
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.IX Item "True (1)"
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This means \*(L"carry on the decoding process\*(R", and is meaningful even though
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this function couldn't decode the input into anything, because there may be
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another decoder implementation that can decode it into something.
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.Sp
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The \fIdata_cb\fR callback should never be called when this function can't
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decode the input into anything.
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.IP "False (0)" 4
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.IX Item "False (0)"
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This means \*(L"stop the decoding process\*(R", and is meaningful when the input
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could be decoded into some sort of object that this function understands,
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but further treatment of that object results into errors that won't be
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possible for some other decoder implementation to get a different result.
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.PP
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The conditions to stop the decoding process are at the discretion of the
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implementation.
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.SS "Decoder operation parameters"
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.IX Subsection "Decoder operation parameters"
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There are currently no operation parameters currently recognised by the
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built-in decoders.
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.PP
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Parameters currently recognised by the built-in pass phrase callback:
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.ie n .IP """info"" (\fB\s-1OSSL_PASSPHRASE_PARAM_INFO\s0\fR) <\s-1UTF8\s0 string>" 4
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.el .IP "``info'' (\fB\s-1OSSL_PASSPHRASE_PARAM_INFO\s0\fR) <\s-1UTF8\s0 string>" 4
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.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_decoder_newctx()\fR returns a pointer to a context, or \s-1NULL\s0 on
|
|
failure.
|
|
.PP
|
|
\&\fIOSSL_FUNC_decoder_set_ctx_params()\fR returns 1, unless a recognised
|
|
parameter was invalid or caused an error, for which 0 is returned.
|
|
.PP
|
|
\&\fIOSSL_FUNC_decoder_settable_ctx_params()\fR returns a pointer to an array of
|
|
constant \s-1\fIOSSL_PARAM\s0\fR\|(3) elements.
|
|
.PP
|
|
\&\fIOSSL_FUNC_decoder_does_selection()\fR returns 1 if the decoder implementation
|
|
supports any of the \fIselection\fR bits, otherwise 0.
|
|
.PP
|
|
\&\fIOSSL_FUNC_decoder_decode()\fR returns 1 to signal that the decoding process
|
|
should continue, or 0 to signal that it should stop.
|
|
.SH "SEE ALSO"
|
|
.IX Header "SEE ALSO"
|
|
\&\fIprovider\fR\|(7)
|
|
.SH "HISTORY"
|
|
.IX Header "HISTORY"
|
|
The \s-1DECODER\s0 interface was introduced in OpenSSL 3.0.
|
|
.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>.
|