406 lines
17 KiB
Plaintext
406 lines
17 KiB
Plaintext
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.\" ========================================================================
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.\"
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.IX Title "PROVIDER-DIGEST 7ossl"
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.TH PROVIDER-DIGEST 7ossl "2024-10-22" "3.4.0" "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\-digest \- The digest 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_dispatch.h>
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\& #include <openssl/core_names.h>
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\&
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\& /*
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\& * Digests support the following function signatures in OSSL_DISPATCH arrays.
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\& * (The function signatures are not actual functions).
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\& */
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\&
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\& /* Context management */
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\& void *OSSL_FUNC_digest_newctx(void *provctx);
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\& void OSSL_FUNC_digest_freectx(void *dctx);
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\& void *OSSL_FUNC_digest_dupctx(void *dctx);
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\&
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\& /* Digest generation */
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\& int OSSL_FUNC_digest_init(void *dctx, const OSSL_PARAM params[]);
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\& int OSSL_FUNC_digest_update(void *dctx, const unsigned char *in, size_t inl);
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\& int OSSL_FUNC_digest_final(void *dctx, unsigned char *out, size_t *outl,
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\& size_t outsz);
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\& int OSSL_FUNC_digest_digest(void *provctx, const unsigned char *in, size_t inl,
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\& unsigned char *out, size_t *outl, size_t outsz);
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\&
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\& /* Digest parameter descriptors */
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\& const OSSL_PARAM *OSSL_FUNC_digest_gettable_params(void *provctx);
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\&
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\& /* Digest operation parameter descriptors */
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\& const OSSL_PARAM *OSSL_FUNC_digest_gettable_ctx_params(void *dctx,
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\& void *provctx);
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\& const OSSL_PARAM *OSSL_FUNC_digest_settable_ctx_params(void *dctx,
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\& void *provctx);
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\&
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\& /* Digest parameters */
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\& int OSSL_FUNC_digest_get_params(OSSL_PARAM params[]);
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\&
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\& /* Digest operation parameters */
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\& int OSSL_FUNC_digest_set_ctx_params(void *dctx, const OSSL_PARAM params[]);
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\& int OSSL_FUNC_digest_get_ctx_params(void *dctx, OSSL_PARAM params[]);
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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 \fBprovider\fR\|(7)
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for further information.
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.PP
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The \s-1DIGEST\s0 operation enables providers to implement digest algorithms and make
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them available to applications via the \s-1API\s0 functions \fBEVP_DigestInit_ex\fR\|(3),
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\&\fBEVP_DigestUpdate\fR\|(3) and \fBEVP_DigestFinal\fR\|(3) (and 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 \s-1\fBOSSL_DISPATCH\s0\fR\|(3) arrays via
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\&\s-1\fBOSSL_ALGORITHM\s0\fR\|(3) arrays that are returned by the provider's
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\&\fBprovider_query_operation()\fR function
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(see \*(L"Provider Functions\*(R" in \fBprovider\-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\fBOSSL_DISPATCH\s0\fR\|(3) element named
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\&\fBOSSL_FUNC_{name}\fR.
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For example, the \*(L"function\*(R" \fBOSSL_FUNC_digest_newctx()\fR has these:
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.PP
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.Vb 3
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\& typedef void *(OSSL_FUNC_digest_newctx_fn)(void *provctx);
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\& static ossl_inline OSSL_FUNC_digest_newctx_fn
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\& OSSL_FUNC_digest_newctx(const OSSL_DISPATCH *opf);
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.Ve
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.PP
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\&\s-1\fBOSSL_DISPATCH\s0\fR\|(3) arrays are indexed by numbers that are provided as
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macros in \fBopenssl\-core_dispatch.h\fR\|(7), as follows:
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.PP
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.Vb 3
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\& OSSL_FUNC_digest_newctx OSSL_FUNC_DIGEST_NEWCTX
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\& OSSL_FUNC_digest_freectx OSSL_FUNC_DIGEST_FREECTX
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\& OSSL_FUNC_digest_dupctx OSSL_FUNC_DIGEST_DUPCTX
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\&
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\& OSSL_FUNC_digest_init OSSL_FUNC_DIGEST_INIT
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\& OSSL_FUNC_digest_update OSSL_FUNC_DIGEST_UPDATE
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\& OSSL_FUNC_digest_final OSSL_FUNC_DIGEST_FINAL
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\& OSSL_FUNC_digest_digest OSSL_FUNC_DIGEST_DIGEST
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\&
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\& OSSL_FUNC_digest_get_params OSSL_FUNC_DIGEST_GET_PARAMS
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\& OSSL_FUNC_digest_get_ctx_params OSSL_FUNC_DIGEST_GET_CTX_PARAMS
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\& OSSL_FUNC_digest_set_ctx_params OSSL_FUNC_DIGEST_SET_CTX_PARAMS
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\&
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\& OSSL_FUNC_digest_gettable_params OSSL_FUNC_DIGEST_GETTABLE_PARAMS
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\& OSSL_FUNC_digest_gettable_ctx_params OSSL_FUNC_DIGEST_GETTABLE_CTX_PARAMS
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\& OSSL_FUNC_digest_settable_ctx_params OSSL_FUNC_DIGEST_SETTABLE_CTX_PARAMS
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.Ve
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.PP
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A digest algorithm implementation may not implement all of these functions.
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In order to be usable all or none of OSSL_FUNC_digest_newctx, OSSL_FUNC_digest_freectx,
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OSSL_FUNC_digest_init, OSSL_FUNC_digest_update and OSSL_FUNC_digest_final should be implemented.
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All other functions are optional.
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.SS "Context Management Functions"
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.IX Subsection "Context Management Functions"
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\&\fBOSSL_FUNC_digest_newctx()\fR should create and return a pointer to a provider side
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structure for holding context information during a digest operation.
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A pointer to this context will be passed back in a number of the other digest
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operation function calls.
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The parameter \fIprovctx\fR is the provider context generated during provider
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initialisation (see \fBprovider\fR\|(7)).
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.PP
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\&\fBOSSL_FUNC_digest_freectx()\fR is passed a pointer to the provider side digest context in
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the \fIdctx\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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\&\fBOSSL_FUNC_digest_dupctx()\fR should duplicate the provider side digest context in the
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\&\fIdctx\fR parameter and return the duplicate copy.
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.SS "Digest Generation Functions"
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.IX Subsection "Digest Generation Functions"
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\&\fBOSSL_FUNC_digest_init()\fR initialises a digest operation given a newly created
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provider side digest context in the \fIdctx\fR parameter.
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The \fIparams\fR, if not \s-1NULL,\s0 should be set on the context in a manner similar to
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using \fBOSSL_FUNC_digest_set_ctx_params()\fR.
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.PP
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\&\fBOSSL_FUNC_digest_update()\fR is called to supply data to be digested as part of a
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previously initialised digest operation.
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The \fIdctx\fR parameter contains a pointer to a previously initialised provider
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side context.
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\&\fBOSSL_FUNC_digest_update()\fR should digest \fIinl\fR bytes of data at the location pointed to
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by \fIin\fR.
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\&\fBOSSL_FUNC_digest_update()\fR may be called multiple times for a single digest operation.
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.PP
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\&\fBOSSL_FUNC_digest_final()\fR generates a digest started through previous \fBOSSL_FUNC_digest_init()\fR
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and \fBOSSL_FUNC_digest_update()\fR calls.
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The \fIdctx\fR parameter contains a pointer to the provider side context.
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The digest should be written to \fI*out\fR and the length of the digest to
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\&\fI*outl\fR.
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The digest should not exceed \fIoutsz\fR bytes.
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.PP
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\&\fBOSSL_FUNC_digest_digest()\fR is a \*(L"oneshot\*(R" digest function.
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No provider side digest context is used.
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Instead the provider context that was created during provider initialisation is
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passed in the \fIprovctx\fR parameter (see \fBprovider\fR\|(7)).
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\&\fIinl\fR bytes at \fIin\fR should be digested and the result should be stored at
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\&\fIout\fR. The length of the digest should be stored in \fI*outl\fR which should not
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exceed \fIoutsz\fR bytes.
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.SS "Digest Parameters"
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.IX Subsection "Digest Parameters"
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See \s-1\fBOSSL_PARAM\s0\fR\|(3) for further details on the parameters structure used by
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these functions.
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.PP
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\&\fBOSSL_FUNC_digest_get_params()\fR gets details of the algorithm implementation
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and stores them in \fIparams\fR.
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.PP
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\&\fBOSSL_FUNC_digest_set_ctx_params()\fR sets digest operation parameters for the
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provider side digest context \fIdctx\fR to \fIparams\fR.
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Any parameter settings are additional to any that were previously set.
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Passing \s-1NULL\s0 for \fIparams\fR should return true.
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.PP
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\&\fBOSSL_FUNC_digest_get_ctx_params()\fR gets digest operation details details from
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the given provider side digest context \fIdctx\fR and stores them in \fIparams\fR.
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Passing \s-1NULL\s0 for \fIparams\fR should return true.
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.PP
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\&\fBOSSL_FUNC_digest_gettable_params()\fR returns a constant \s-1\fBOSSL_PARAM\s0\fR\|(3) array
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containing descriptors of the parameters that \fBOSSL_FUNC_digest_get_params()\fR
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can handle.
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.PP
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\&\fBOSSL_FUNC_digest_gettable_ctx_params()\fR and
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\&\fBOSSL_FUNC_digest_settable_ctx_params()\fR both return constant
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\&\s-1\fBOSSL_PARAM\s0\fR\|(3) arrays as descriptors of the parameters that
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\&\fBOSSL_FUNC_digest_get_ctx_params()\fR and \fBOSSL_FUNC_digest_set_ctx_params()\fR
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can handle, respectively. The array is based on the current state of
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the provider side context if \fIdctx\fR is not \s-1NULL\s0 and on the provider
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side algorithm \fIprovctx\fR otherwise.
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.PP
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Parameters currently recognised by built-in digests with this function
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are as follows. Not all parameters are relevant to, or are understood
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by all digests:
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.ie n .IP """blocksize"" (\fB\s-1OSSL_DIGEST_PARAM_BLOCK_SIZE\s0\fR) <unsigned integer>" 4
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.el .IP "``blocksize'' (\fB\s-1OSSL_DIGEST_PARAM_BLOCK_SIZE\s0\fR) <unsigned integer>" 4
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.IX Item "blocksize (OSSL_DIGEST_PARAM_BLOCK_SIZE) <unsigned integer>"
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The digest block size.
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The length of the \*(L"blocksize\*(R" parameter should not exceed that of a \fBsize_t\fR.
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.ie n .IP """size"" (\fB\s-1OSSL_DIGEST_PARAM_SIZE\s0\fR) <unsigned integer>" 4
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.el .IP "``size'' (\fB\s-1OSSL_DIGEST_PARAM_SIZE\s0\fR) <unsigned integer>" 4
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.IX Item "size (OSSL_DIGEST_PARAM_SIZE) <unsigned integer>"
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The digest output size.
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The length of the \*(L"size\*(R" parameter should not exceed that of a \fBsize_t\fR.
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.ie n .IP """flags"" (\fB\s-1OSSL_DIGEST_PARAM_FLAGS\s0\fR) <unsigned integer>" 4
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.el .IP "``flags'' (\fB\s-1OSSL_DIGEST_PARAM_FLAGS\s0\fR) <unsigned integer>" 4
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.IX Item "flags (OSSL_DIGEST_PARAM_FLAGS) <unsigned integer>"
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Diverse flags that describe exceptional behaviour for the digest:
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.RS 4
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.IP "\fB\s-1EVP_MD_FLAG_ONESHOT\s0\fR" 4
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.IX Item "EVP_MD_FLAG_ONESHOT"
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This digest method can only handle one block of input.
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.IP "\fB\s-1EVP_MD_FLAG_XOF\s0\fR" 4
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.IX Item "EVP_MD_FLAG_XOF"
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This digest method is an extensible-output function (\s-1XOF\s0).
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.IP "\fB\s-1EVP_MD_FLAG_DIGALGID_NULL\s0\fR" 4
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.IX Item "EVP_MD_FLAG_DIGALGID_NULL"
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When setting up a DigestAlgorithmIdentifier, this flag will have the
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parameter set to \s-1NULL\s0 by default. Use this for PKCS#1. \fINote: if
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combined with \s-1EVP_MD_FLAG_DIGALGID_ABSENT,\s0 the latter will override.\fR
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.IP "\fB\s-1EVP_MD_FLAG_DIGALGID_ABSENT\s0\fR" 4
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.IX Item "EVP_MD_FLAG_DIGALGID_ABSENT"
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When setting up a DigestAlgorithmIdentifier, this flag will have the
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parameter be left absent by default. \fINote: if combined with
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\&\s-1EVP_MD_FLAG_DIGALGID_NULL,\s0 the latter will be overridden.\fR
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.IP "\fB\s-1EVP_MD_FLAG_DIGALGID_CUSTOM\s0\fR" 4
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.IX Item "EVP_MD_FLAG_DIGALGID_CUSTOM"
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Custom DigestAlgorithmIdentifier handling via ctrl, with
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\&\fB\s-1EVP_MD_FLAG_DIGALGID_ABSENT\s0\fR as default. \fINote: if combined with
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\&\s-1EVP_MD_FLAG_DIGALGID_NULL,\s0 the latter will be overridden.\fR
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Currently unused.
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.RE
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.RS 4
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.Sp
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The length of the \*(L"flags\*(R" parameter should equal that of an
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\&\fBunsigned long int\fR.
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.RE
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.SS "Digest Context Parameters"
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.IX Subsection "Digest Context Parameters"
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\&\fBOSSL_FUNC_digest_set_ctx_params()\fR sets digest parameters associated with the
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given provider side digest context \fIdctx\fR to \fIparams\fR.
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Any parameter settings are additional to any that were previously set.
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See \s-1\fBOSSL_PARAM\s0\fR\|(3) for further details on the parameters structure.
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.PP
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\&\fBOSSL_FUNC_digest_get_ctx_params()\fR gets details of currently set parameters
|
|
values associated with the give provider side digest context \fIdctx\fR
|
|
and stores them in \fIparams\fR.
|
|
See \s-1\fBOSSL_PARAM\s0\fR\|(3) for further details on the parameters structure.
|
|
.SH "RETURN VALUES"
|
|
.IX Header "RETURN VALUES"
|
|
\&\fBOSSL_FUNC_digest_newctx()\fR and \fBOSSL_FUNC_digest_dupctx()\fR should return the newly created
|
|
provider side digest context, or \s-1NULL\s0 on failure.
|
|
.PP
|
|
\&\fBOSSL_FUNC_digest_init()\fR, \fBOSSL_FUNC_digest_update()\fR, \fBOSSL_FUNC_digest_final()\fR, \fBOSSL_FUNC_digest_digest()\fR,
|
|
\&\fBOSSL_FUNC_digest_set_params()\fR and \fBOSSL_FUNC_digest_get_params()\fR should return 1 for success or
|
|
0 on error.
|
|
.PP
|
|
\&\fBOSSL_FUNC_digest_size()\fR should return the digest size.
|
|
.PP
|
|
\&\fBOSSL_FUNC_digest_block_size()\fR should return the block size of the underlying digest
|
|
algorithm.
|
|
.SH "BUGS"
|
|
.IX Header "BUGS"
|
|
The \fBEVP_Q_digest()\fR, \fBEVP_Digest()\fR and \fBEVP_DigestFinal_ex()\fR \s-1API\s0 calls do not
|
|
expect the digest size to be larger than \s-1EVP_MAX_MD_SIZE.\s0 Any algorithm which
|
|
produces larger digests is unusable with those \s-1API\s0 calls.
|
|
.SH "SEE ALSO"
|
|
.IX Header "SEE ALSO"
|
|
\&\fBprovider\fR\|(7), \s-1\fBOSSL_PROVIDER\-FIPS\s0\fR\|(7), \fBOSSL_PROVIDER\-default\fR\|(7),
|
|
\&\fBOSSL_PROVIDER\-legacy\fR\|(7),
|
|
\&\fBEVP_MD\-common\fR\|(7), \s-1\fBEVP_MD\-BLAKE2\s0\fR\|(7), \s-1\fBEVP_MD\-MD2\s0\fR\|(7),
|
|
\&\s-1\fBEVP_MD\-MD4\s0\fR\|(7), \s-1\fBEVP_MD\-MD5\s0\fR\|(7), \s-1\fBEVP_MD\-MD5\-SHA1\s0\fR\|(7),
|
|
\&\s-1\fBEVP_MD\-MDC2\s0\fR\|(7), \s-1\fBEVP_MD\-RIPEMD160\s0\fR\|(7), \s-1\fBEVP_MD\-SHA1\s0\fR\|(7),
|
|
\&\s-1\fBEVP_MD\-SHA2\s0\fR\|(7), \s-1\fBEVP_MD\-SHA3\s0\fR\|(7), \s-1\fBEVP_MD\-KECCAK\s0\fR\|(7)
|
|
\&\s-1\fBEVP_MD\-SHAKE\s0\fR\|(7), \s-1\fBEVP_MD\-SM3\s0\fR\|(7), \s-1\fBEVP_MD\-WHIRLPOOL\s0\fR\|(7),
|
|
\&\s-1\fBEVP_MD\-NULL\s0\fR\|(7),
|
|
\&\fBlife_cycle\-digest\fR\|(7), \fBEVP_DigestInit\fR\|(3)
|
|
.SH "HISTORY"
|
|
.IX Header "HISTORY"
|
|
The provider \s-1DIGEST\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>.
|