376 lines
16 KiB
Groff
376 lines
16 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "PROVIDER-KEYEXCH 7"
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.TH PROVIDER-KEYEXCH 7 "2020-03-02" "3.0.0-dev" "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\-keyexch \- The keyexch library <\-> provider functions
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 2
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\& #include <openssl/core_numbers.h>
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\& #include <openssl/core_names.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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\& /* Context management */
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\& void *OP_keyexch_newctx(void *provctx);
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\& void OP_keyexch_freectx(void *ctx);
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\& void *OP_keyexch_dupctx(void *ctx);
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\&
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\& /* Shared secret derivation */
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\& int OP_keyexch_init(void *ctx, void *provkey);
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\& int OP_keyexch_set_peer(void *ctx, void *provkey);
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\& int OP_keyexch_derive(void *ctx, unsigned char *secret, size_t *secretlen,
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\& size_t outlen);
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\&
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\& /* Key Exchange parameters */
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\& int OP_keyexch_set_ctx_params(void *ctx, const OSSL_PARAM params[]);
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\& const OSSL_PARAM *OP_keyexch_settable_ctx_params(void);
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\& int OP_keyexch_get_ctx_params(void *ctx, OSSL_PARAM params[]);
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\& const OSSL_PARAM *OP_keyexch_gettable_ctx_params(void);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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This documentation is primarily aimed at provider authors. See \fIprovider\fR\|(7)
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for further information.
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.PP
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The key exchange (\s-1OSSL_OP_KEYEXCH\s0) operation enables providers to implement key
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exchange algorithms and make them available to applications via
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\&\fIEVP_PKEY_derive\fR\|(3) and
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other related functions).
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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 \fB\s-1OSSL_DISPATCH\s0\fR arrays via
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\&\fB\s-1OSSL_ALGORITHM\s0\fR 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_{name}_fn\fR, and a helper function to retrieve the
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function pointer from an \fB\s-1OSSL_DISPATCH\s0\fR element named
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\&\fBOSSL_get_{name}\fR.
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For example, the \*(L"function\*(R" \fIOP_keyexch_newctx()\fR has these:
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.PP
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.Vb 3
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\& typedef void *(OSSL_OP_keyexch_newctx_fn)(void *provctx);
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\& static ossl_inline OSSL_OP_keyexch_newctx_fn
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\& OSSL_get_OP_keyexch_newctx(const OSSL_DISPATCH *opf);
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.Ve
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.PP
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\&\fB\s-1OSSL_DISPATCH\s0\fR arrays are indexed by numbers that are provided as
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macros in \fIopenssl\-core_numbers.h\fR\|(7), as follows:
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.PP
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.Vb 3
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\& OP_keyexch_newctx OSSL_FUNC_KEYEXCH_NEWCTX
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\& OP_keyexch_freectx OSSL_FUNC_KEYEXCH_FREECTX
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\& OP_keyexch_dupctx OSSL_FUNC_KEYEXCH_DUPCTX
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\&
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\& OP_keyexch_init OSSL_FUNC_KEYEXCH_INIT
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\& OP_keyexch_set_peer OSSL_FUNC_KEYEXCH_SET_PEER
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\& OP_keyexch_derive OSSL_FUNC_KEYEXCH_DERIVE
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\&
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\& OP_keyexch_set_ctx_params OSSL_FUNC_KEYEXCH_SET_CTX_PARAMS
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\& OP_keyexch_settable_ctx_params OSSL_FUNC_KEYEXCH_SETTABLE_CTX_PARAMS
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\& OP_keyexch_get_ctx_params OSSL_FUNC_KEYEXCH_GET_CTX_PARAMS
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\& OP_keyexch_gettable_ctx_params OSSL_FUNC_KEYEXCH_GETTABLE_CTX_PARAMS
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.Ve
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.PP
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A key exchange algorithm implementation may not implement all of these functions.
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In order to be a consistent set of functions a provider must implement
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OP_keyexch_newctx, OP_keyexch_freectx, OP_keyexch_init and OP_keyexch_derive.
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All other functions are optional.
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.PP
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A key exchange algorithm must also implement some mechanism for generating,
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loading or importing keys via the key management (\s-1OSSL_OP_KEYMGMT\s0) operation.
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See \fIprovider\-keymgmt\fR\|(7) for further details.
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.SS "Context Management Functions"
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.IX Subsection "Context Management Functions"
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\&\fIOP_keyexch_newctx()\fR should create and return a pointer to a provider side
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structure for holding context information during a key exchange operation.
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A pointer to this context will be passed back in a number of the other key
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exchange operation function calls.
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The parameter \fIprovctx\fR is the provider context generated during provider
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initialisation (see \fIprovider\fR\|(7)).
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.PP
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\&\fIOP_keyexch_freectx()\fR is passed a pointer to the provider side key exchange
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context in the \fIctx\fR parameter.
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This function should free any resources associated with that context.
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.PP
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\&\fIOP_keyexch_dupctx()\fR should duplicate the provider side key exchange context in
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the \fIctx\fR parameter and return the duplicate copy.
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.SS "Shared Secret Derivation Functions"
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.IX Subsection "Shared Secret Derivation Functions"
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\&\fIOP_keyexch_init()\fR initialises a key exchange operation given a provider side key
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exchange context in the \fIctx\fR parameter, and a pointer to a provider key object
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in the \fIprovkey\fR parameter. The key object should have been previously
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generated, loaded or imported into the provider using the key management
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(\s-1OSSL_OP_KEYMGMT\s0) operation (see \fIprovider\-keymgmt\fR\|(7)>.
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.PP
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\&\fIOP_keyexch_set_peer()\fR is called to supply the peer's public key (in the
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\&\fIprovkey\fR parameter) to be used when deriving the shared secret.
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It is also passed a previously initialised key exchange context in the \fIctx\fR
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parameter.
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The key object should have been previously generated, loaded or imported into
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the provider using the key management (\s-1OSSL_OP_KEYMGMT\s0) operation (see
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\&\fIprovider\-keymgmt\fR\|(7)>.
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.PP
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\&\fIOP_keyexch_derive()\fR performs the actual key exchange itself by deriving a shared
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secret.
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A previously initialised key exchange context is passed in the \fIctx\fR
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parameter.
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The derived secret should be written to the location \fIsecret\fR which should not
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exceed \fIoutlen\fR bytes.
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The length of the shared secret should be written to \fI*secretlen\fR.
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If \fIsecret\fR is \s-1NULL\s0 then the maximum length of the shared secret should be
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written to \fI*secretlen\fR.
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.SS "Key Exchange Parameters Functions"
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.IX Subsection "Key Exchange Parameters Functions"
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\&\fIOP_keyexch_set_ctx_params()\fR sets key exchange parameters associated with the
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given provider side key exchange context \fIctx\fR to \fIparams\fR,
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see \*(L"Key Exchange Parameters\*(R".
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Any parameter settings are additional to any that were previously set.
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.PP
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\&\fIOP_keyexch_get_ctx_params()\fR gets key exchange parameters associated with the
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given provider side key exchange context \fIctx\fR into \fIparams\fR,
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see \*(L"Key Exchange Parameters\*(R".
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.PP
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\&\fIOP_keyexch_settable_ctx_params()\fR yields a constant \fB\s-1OSSL_PARAM\s0\fR array that
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describes the settable parameters, i.e. parameters that can be used with
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\&\fIOP_signature_set_ctx_params()\fR.
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If \fIOP_keyexch_settable_ctx_params()\fR is present, \fIOP_keyexch_set_ctx_params()\fR must
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also be present, and vice versa.
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Similarly, \fIOP_keyexch_gettable_ctx_params()\fR yields a constant \fB\s-1OSSL_PARAM\s0\fR
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array that describes the gettable parameters, i.e. parameters that can be
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handled by \fIOP_signature_get_ctx_params()\fR.
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If \fIOP_keyexch_gettable_ctx_params()\fR is present, \fIOP_keyexch_get_ctx_params()\fR must
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also be present, and vice versa.
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See \s-1\fIOSSL_PARAM\s0\fR\|(3) for the use of \fB\s-1OSSL_PARAM\s0\fR as parameter descriptor.
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.PP
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Notice that not all settable parameters are also gettable, and vice versa.
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.SS "Key Exchange Parameters"
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.IX Subsection "Key Exchange Parameters"
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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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the \fIOP_keyexch_set_ctx_params()\fR and \fIOP_keyexch_get_ctx_params()\fR functions.
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.PP
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Parameters currently recognised by built-in key exchange algorithms are as
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follows.
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Not all parameters are relevant to, or are understood by all key exchange
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algorithms:
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.ie n .IP """pad"" (\fB\s-1OSSL_EXCHANGE_PARAM_PAD\s0\fR) <unsigned integer>" 4
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.el .IP "``pad'' (\fB\s-1OSSL_EXCHANGE_PARAM_PAD\s0\fR) <unsigned integer>" 4
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.IX Item "pad (OSSL_EXCHANGE_PARAM_PAD) <unsigned integer>"
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Sets the padding mode for the associated key exchange ctx.
|
||
|
|
Setting a value of 1 will turn padding on.
|
||
|
|
Setting a vlue of 0 will turn padding off.
|
||
|
|
If padding is off then the derived shared secret may be smaller than the largest
|
||
|
|
possible secret size.
|
||
|
|
If padding is on then the derived shared secret will have its first bytes filled
|
||
|
|
with 0s where necessary to make the shared secret the same size as the largest
|
||
|
|
possible secret size.
|
||
|
|
.ie n .IP """ecdh-cofactor-mode"" (\fB\s-1OSSL_EXCHANGE_PARAM_EC_ECDH_COFACTOR_MODE\s0\fR) <integer>" 4
|
||
|
|
.el .IP "``ecdh-cofactor-mode'' (\fB\s-1OSSL_EXCHANGE_PARAM_EC_ECDH_COFACTOR_MODE\s0\fR) <integer>" 4
|
||
|
|
.IX Item "ecdh-cofactor-mode (OSSL_EXCHANGE_PARAM_EC_ECDH_COFACTOR_MODE) <integer>"
|
||
|
|
Sets/gets the \s-1ECDH\s0 mode of operation for the associated key exchange ctx.
|
||
|
|
.Sp
|
||
|
|
In the context of an Elliptic Curve Diffie-Hellman key exchange, this parameter
|
||
|
|
can be used to select between the plain Diffie-Hellman (\s-1DH\s0) or Cofactor
|
||
|
|
Diffie-Hellman (\s-1CDH\s0) variants of the key exchange algorithm.
|
||
|
|
.Sp
|
||
|
|
When setting, the value should be 1, 0 or \-1, respectively forcing cofactor mode
|
||
|
|
on, off, or resetting it to the default for the private key associated with the
|
||
|
|
given key exchange ctx.
|
||
|
|
.Sp
|
||
|
|
When getting, the value should be either 1 or 0, respectively signaling if the
|
||
|
|
cofactor mode is on or off.
|
||
|
|
.Sp
|
||
|
|
See also \fIprovider\-keymgmt\fR\|(7) for the related
|
||
|
|
\&\fB\s-1OSSL_PKEY_PARAM_USE_COFACTOR_ECDH\s0\fR parameter that can be set on a
|
||
|
|
per-key basis.
|
||
|
|
.ie n .IP """kdf-type"" (\fB\s-1OSSL_EXCHANGE_PARAM_KDF_TYPE\s0\fR) <utf8_string>" 4
|
||
|
|
.el .IP "``kdf-type'' (\fB\s-1OSSL_EXCHANGE_PARAM_KDF_TYPE\s0\fR) <utf8_string>" 4
|
||
|
|
.IX Item "kdf-type (OSSL_EXCHANGE_PARAM_KDF_TYPE) <utf8_string>"
|
||
|
|
Sets/gets the Key Derivation Function type to apply within the associated key
|
||
|
|
exchange ctx.
|
||
|
|
.ie n .IP """kdf-digest"" (\fB\s-1OSSL_EXCHANGE_PARAM_KDF_DIGEST\s0\fR) <utf8_string>" 4
|
||
|
|
.el .IP "``kdf-digest'' (\fB\s-1OSSL_EXCHANGE_PARAM_KDF_DIGEST\s0\fR) <utf8_string>" 4
|
||
|
|
.IX Item "kdf-digest (OSSL_EXCHANGE_PARAM_KDF_DIGEST) <utf8_string>"
|
||
|
|
Sets/gets the Digest algorithm to be used as part of the Key Derivation Function
|
||
|
|
associated with the given key exchange ctx.
|
||
|
|
.ie n .IP """kdf-digest-props"" (\fB\s-1OSSL_EXCHANGE_PARAM_KDF_DIGEST_PROPS\s0\fR) <utf8_string>" 4
|
||
|
|
.el .IP "``kdf-digest-props'' (\fB\s-1OSSL_EXCHANGE_PARAM_KDF_DIGEST_PROPS\s0\fR) <utf8_string>" 4
|
||
|
|
.IX Item "kdf-digest-props (OSSL_EXCHANGE_PARAM_KDF_DIGEST_PROPS) <utf8_string>"
|
||
|
|
Sets properties to be used upon look up of the implementation for the selected
|
||
|
|
Digest algorithm for the Key Derivation Function associated with the given key
|
||
|
|
exchange ctx.
|
||
|
|
.ie n .IP """kdf-outlen"" (\fB\s-1OSSL_EXCHANGE_PARAM_KDF_OUTLEN\s0\fR) <size_t>" 4
|
||
|
|
.el .IP "``kdf-outlen'' (\fB\s-1OSSL_EXCHANGE_PARAM_KDF_OUTLEN\s0\fR) <size_t>" 4
|
||
|
|
.IX Item "kdf-outlen (OSSL_EXCHANGE_PARAM_KDF_OUTLEN) <size_t>"
|
||
|
|
Sets/gets the desired size for the output of the chosen Key Derivation Function
|
||
|
|
associated with the given key exchange ctx.
|
||
|
|
.ie n .IP """kdf-ukm"" (\fB\s-1OSSL_EXCHANGE_PARAM_KDF_UKM\s0\fR) <octet_string>" 4
|
||
|
|
.el .IP "``kdf-ukm'' (\fB\s-1OSSL_EXCHANGE_PARAM_KDF_UKM\s0\fR) <octet_string>" 4
|
||
|
|
.IX Item "kdf-ukm (OSSL_EXCHANGE_PARAM_KDF_UKM) <octet_string>"
|
||
|
|
Sets/gets User Key Material to be used as part of the selected Key Derivation
|
||
|
|
Function associated with the given key exchange ctx.
|
||
|
|
.ie n .IP """kdf-ukm-len"" (\fB\s-1OSSL_EXCHANGE_PARAM_KDF_UKM_LEN\s0\fR) <size_t>" 4
|
||
|
|
.el .IP "``kdf-ukm-len'' (\fB\s-1OSSL_EXCHANGE_PARAM_KDF_UKM_LEN\s0\fR) <size_t>" 4
|
||
|
|
.IX Item "kdf-ukm-len (OSSL_EXCHANGE_PARAM_KDF_UKM_LEN) <size_t>"
|
||
|
|
Sets/gets the size of the User Key Material to be used as part of the selected
|
||
|
|
Key Derivation Function associated with the given key exchange ctx.
|
||
|
|
.SH "RETURN VALUES"
|
||
|
|
.IX Header "RETURN VALUES"
|
||
|
|
\&\fIOP_keyexch_newctx()\fR and \fIOP_keyexch_dupctx()\fR should return the newly created
|
||
|
|
provider side key exchange context, or \s-1NULL\s0 on failure.
|
||
|
|
.PP
|
||
|
|
\&\fIOP_keyexch_init()\fR, \fIOP_keyexch_set_peer()\fR, \fIOP_keyexch_derive()\fR,
|
||
|
|
\&\fIOP_keyexch_set_params()\fR, and \fIOP_keyexch_get_params()\fR should return 1 for success
|
||
|
|
or 0 on error.
|
||
|
|
.PP
|
||
|
|
\&\fIOP_keyexch_settable_ctx_params()\fR and \fIOP_keyexch_gettable_ctx_params()\fR should
|
||
|
|
always return a constant \fB\s-1OSSL_PARAM\s0\fR array.
|
||
|
|
.SH "SEE ALSO"
|
||
|
|
.IX Header "SEE ALSO"
|
||
|
|
\&\fIprovider\fR\|(7)
|
||
|
|
.SH "HISTORY"
|
||
|
|
.IX Header "HISTORY"
|
||
|
|
The provider \s-1KEYEXCH\s0 interface was introduced in OpenSSL 3.0.
|
||
|
|
.SH "COPYRIGHT"
|
||
|
|
.IX Header "COPYRIGHT"
|
||
|
|
Copyright 2019 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>.
|