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+\{\
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+.rm #[ #] #H #V #F C
+.\" ========================================================================
+.\"
+.IX Title "PROVIDER-DIGEST 7ossl"
+.TH PROVIDER-DIGEST 7ossl "2023-09-19" "3.0.11" "OpenSSL"
+.\" For nroff, turn off justification. Always turn off hyphenation; it makes
+.\" way too many mistakes in technical documents.
+.if n .ad l
+.nh
+.SH "NAME"
+provider\-digest \- The digest library <\-> provider functions
+.SH "SYNOPSIS"
+.IX Header "SYNOPSIS"
+.Vb 2
+\& #include <openssl/core_dispatch.h>
+\& #include <openssl/core_names.h>
+\&
+\& /*
+\& * Digests support the following function signatures in OSSL_DISPATCH arrays.
+\& * (The function signatures are not actual functions).
+\& */
+\&
+\& /* Context management */
+\& void *OSSL_FUNC_digest_newctx(void *provctx);
+\& void OSSL_FUNC_digest_freectx(void *dctx);
+\& void *OSSL_FUNC_digest_dupctx(void *dctx);
+\&
+\& /* Digest generation */
+\& int OSSL_FUNC_digest_init(void *dctx, const OSSL_PARAM params[]);
+\& int OSSL_FUNC_digest_update(void *dctx, const unsigned char *in, size_t inl);
+\& int OSSL_FUNC_digest_final(void *dctx, unsigned char *out, size_t *outl,
+\& size_t outsz);
+\& int OSSL_FUNC_digest_digest(void *provctx, const unsigned char *in, size_t inl,
+\& unsigned char *out, size_t *outl, size_t outsz);
+\&
+\& /* Digest parameter descriptors */
+\& const OSSL_PARAM *OSSL_FUNC_digest_gettable_params(void *provctx);
+\&
+\& /* Digest operation parameter descriptors */
+\& const OSSL_PARAM *OSSL_FUNC_digest_gettable_ctx_params(void *dctx,
+\& void *provctx);
+\& const OSSL_PARAM *OSSL_FUNC_digest_settable_ctx_params(void *dctx,
+\& void *provctx);
+\&
+\& /* Digest parameters */
+\& int OSSL_FUNC_digest_get_params(OSSL_PARAM params[]);
+\&
+\& /* Digest operation parameters */
+\& int OSSL_FUNC_digest_set_ctx_params(void *dctx, const OSSL_PARAM params[]);
+\& int OSSL_FUNC_digest_get_ctx_params(void *dctx, OSSL_PARAM params[]);
+.Ve
+.SH "DESCRIPTION"
+.IX Header "DESCRIPTION"
+This documentation is primarily aimed at provider authors. See \fBprovider\fR\|(7)
+for further information.
+.PP
+The \s-1DIGEST\s0 operation enables providers to implement digest algorithms and make
+them available to applications via the \s-1API\s0 functions \fBEVP_DigestInit_ex\fR\|(3),
+\&\fBEVP_DigestUpdate\fR\|(3) and \fBEVP_DigestFinal\fR\|(3) (and other related functions).
+.PP
+All \*(L"functions\*(R" mentioned here are passed as function pointers between
+\&\fIlibcrypto\fR and the provider in \s-1\fBOSSL_DISPATCH\s0\fR\|(3) arrays via
+\&\s-1\fBOSSL_ALGORITHM\s0\fR\|(3) arrays that are returned by the provider's
+\&\fBprovider_query_operation()\fR function
+(see \*(L"Provider Functions\*(R" in \fBprovider\-base\fR\|(7)).
+.PP
+All these \*(L"functions\*(R" have a corresponding function type definition
+named \fBOSSL_FUNC_{name}_fn\fR, and a helper function to retrieve the
+function pointer from an \s-1\fBOSSL_DISPATCH\s0\fR\|(3) element named
+\&\fBOSSL_FUNC_{name}\fR.
+For example, the \*(L"function\*(R" \fBOSSL_FUNC_digest_newctx()\fR has these:
+.PP
+.Vb 3
+\& typedef void *(OSSL_FUNC_digest_newctx_fn)(void *provctx);
+\& static ossl_inline OSSL_FUNC_digest_newctx_fn
+\& OSSL_FUNC_digest_newctx(const OSSL_DISPATCH *opf);
+.Ve
+.PP
+\&\s-1\fBOSSL_DISPATCH\s0\fR\|(3) arrays are indexed by numbers that are provided as
+macros in \fBopenssl\-core_dispatch.h\fR\|(7), as follows:
+.PP
+.Vb 3
+\& OSSL_FUNC_digest_newctx OSSL_FUNC_DIGEST_NEWCTX
+\& OSSL_FUNC_digest_freectx OSSL_FUNC_DIGEST_FREECTX
+\& OSSL_FUNC_digest_dupctx OSSL_FUNC_DIGEST_DUPCTX
+\&
+\& OSSL_FUNC_digest_init OSSL_FUNC_DIGEST_INIT
+\& OSSL_FUNC_digest_update OSSL_FUNC_DIGEST_UPDATE
+\& OSSL_FUNC_digest_final OSSL_FUNC_DIGEST_FINAL
+\& OSSL_FUNC_digest_digest OSSL_FUNC_DIGEST_DIGEST
+\&
+\& OSSL_FUNC_digest_get_params OSSL_FUNC_DIGEST_GET_PARAMS
+\& OSSL_FUNC_digest_get_ctx_params OSSL_FUNC_DIGEST_GET_CTX_PARAMS
+\& OSSL_FUNC_digest_set_ctx_params OSSL_FUNC_DIGEST_SET_CTX_PARAMS
+\&
+\& OSSL_FUNC_digest_gettable_params OSSL_FUNC_DIGEST_GETTABLE_PARAMS
+\& OSSL_FUNC_digest_gettable_ctx_params OSSL_FUNC_DIGEST_GETTABLE_CTX_PARAMS
+\& OSSL_FUNC_digest_settable_ctx_params OSSL_FUNC_DIGEST_SETTABLE_CTX_PARAMS
+.Ve
+.PP
+A digest algorithm implementation may not implement all of these functions.
+In order to be usable all or none of OSSL_FUNC_digest_newctx, OSSL_FUNC_digest_freectx,
+OSSL_FUNC_digest_init, OSSL_FUNC_digest_update and OSSL_FUNC_digest_final should be implemented.
+All other functions are optional.
+.SS "Context Management Functions"
+.IX Subsection "Context Management Functions"
+\&\fBOSSL_FUNC_digest_newctx()\fR should create and return a pointer to a provider side
+structure for holding context information during a digest operation.
+A pointer to this context will be passed back in a number of the other digest
+operation function calls.
+The parameter \fIprovctx\fR is the provider context generated during provider
+initialisation (see \fBprovider\fR\|(7)).
+.PP
+\&\fBOSSL_FUNC_digest_freectx()\fR is passed a pointer to the provider side digest context in
+the \fIdctx\fR parameter.
+This function should free any resources associated with that context.
+.PP
+\&\fBOSSL_FUNC_digest_dupctx()\fR should duplicate the provider side digest context in the
+\&\fIdctx\fR parameter and return the duplicate copy.
+.SS "Digest Generation Functions"
+.IX Subsection "Digest Generation Functions"
+\&\fBOSSL_FUNC_digest_init()\fR initialises a digest operation given a newly created
+provider side digest context in the \fIdctx\fR parameter.
+The \fIparams\fR, if not \s-1NULL,\s0 should be set on the context in a manner similar to
+using \fBOSSL_FUNC_digest_set_ctx_params()\fR.
+.PP
+\&\fBOSSL_FUNC_digest_update()\fR is called to supply data to be digested as part of a
+previously initialised digest operation.
+The \fIdctx\fR parameter contains a pointer to a previously initialised provider
+side context.
+\&\fBOSSL_FUNC_digest_update()\fR should digest \fIinl\fR bytes of data at the location pointed to
+by \fIin\fR.
+\&\fBOSSL_FUNC_digest_update()\fR may be called multiple times for a single digest operation.
+.PP
+\&\fBOSSL_FUNC_digest_final()\fR generates a digest started through previous \fBOSSL_FUNC_digest_init()\fR
+and \fBOSSL_FUNC_digest_update()\fR calls.
+The \fIdctx\fR parameter contains a pointer to the provider side context.
+The digest should be written to \fI*out\fR and the length of the digest to
+\&\fI*outl\fR.
+The digest should not exceed \fIoutsz\fR bytes.
+.PP
+\&\fBOSSL_FUNC_digest_digest()\fR is a \*(L"oneshot\*(R" digest function.
+No provider side digest context is used.
+Instead the provider context that was created during provider initialisation is
+passed in the \fIprovctx\fR parameter (see \fBprovider\fR\|(7)).
+\&\fIinl\fR bytes at \fIin\fR should be digested and the result should be stored at
+\&\fIout\fR. The length of the digest should be stored in \fI*outl\fR which should not
+exceed \fIoutsz\fR bytes.
+.SS "Digest Parameters"
+.IX Subsection "Digest Parameters"
+See \s-1\fBOSSL_PARAM\s0\fR\|(3) for further details on the parameters structure used by
+these functions.
+.PP
+\&\fBOSSL_FUNC_digest_get_params()\fR gets details of the algorithm implementation
+and stores them in \fIparams\fR.
+.PP
+\&\fBOSSL_FUNC_digest_set_ctx_params()\fR sets digest operation parameters for the
+provider side digest context \fIdctx\fR to \fIparams\fR.
+Any parameter settings are additional to any that were previously set.
+Passing \s-1NULL\s0 for \fIparams\fR should return true.
+.PP
+\&\fBOSSL_FUNC_digest_get_ctx_params()\fR gets digest operation details details from
+the given provider side digest context \fIdctx\fR and stores them in \fIparams\fR.
+Passing \s-1NULL\s0 for \fIparams\fR should return true.
+.PP
+\&\fBOSSL_FUNC_digest_gettable_params()\fR returns a constant \s-1\fBOSSL_PARAM\s0\fR\|(3) array
+containing descriptors of the parameters that \fBOSSL_FUNC_digest_get_params()\fR
+can handle.
+.PP
+\&\fBOSSL_FUNC_digest_gettable_ctx_params()\fR and
+\&\fBOSSL_FUNC_digest_settable_ctx_params()\fR both return constant
+\&\s-1\fBOSSL_PARAM\s0\fR\|(3) arrays as descriptors of the parameters that
+\&\fBOSSL_FUNC_digest_get_ctx_params()\fR and \fBOSSL_FUNC_digest_set_ctx_params()\fR
+can handle, respectively. The array is based on the current state of
+the provider side context if \fIdctx\fR is not \s-1NULL\s0 and on the provider
+side algorithm \fIprovctx\fR otherwise.
+.PP
+Parameters currently recognised by built-in digests with this function
+are as follows. Not all parameters are relevant to, or are understood
+by all digests:
+.ie n .IP """blocksize"" (\fB\s-1OSSL_DIGEST_PARAM_BLOCK_SIZE\s0\fR) <unsigned integer>" 4
+.el .IP "``blocksize'' (\fB\s-1OSSL_DIGEST_PARAM_BLOCK_SIZE\s0\fR) <unsigned integer>" 4
+.IX Item "blocksize (OSSL_DIGEST_PARAM_BLOCK_SIZE) <unsigned integer>"
+The digest block size.
+The length of the \*(L"blocksize\*(R" parameter should not exceed that of a \fBsize_t\fR.
+.ie n .IP """size"" (\fB\s-1OSSL_DIGEST_PARAM_SIZE\s0\fR) <unsigned integer>" 4
+.el .IP "``size'' (\fB\s-1OSSL_DIGEST_PARAM_SIZE\s0\fR) <unsigned integer>" 4
+.IX Item "size (OSSL_DIGEST_PARAM_SIZE) <unsigned integer>"
+The digest output size.
+The length of the \*(L"size\*(R" parameter should not exceed that of a \fBsize_t\fR.
+.ie n .IP """flags"" (\fB\s-1OSSL_DIGEST_PARAM_FLAGS\s0\fR) <unsigned integer>" 4
+.el .IP "``flags'' (\fB\s-1OSSL_DIGEST_PARAM_FLAGS\s0\fR) <unsigned integer>" 4
+.IX Item "flags (OSSL_DIGEST_PARAM_FLAGS) <unsigned integer>"
+Diverse flags that describe exceptional behaviour for the digest:
+.RS 4
+.IP "\fB\s-1EVP_MD_FLAG_ONESHOT\s0\fR" 4
+.IX Item "EVP_MD_FLAG_ONESHOT"
+This digest method can only handle one block of input.
+.IP "\fB\s-1EVP_MD_FLAG_XOF\s0\fR" 4
+.IX Item "EVP_MD_FLAG_XOF"
+This digest method is an extensible-output function (\s-1XOF\s0) and supports
+setting the \fB\s-1OSSL_DIGEST_PARAM_XOFLEN\s0\fR parameter.
+.IP "\fB\s-1EVP_MD_FLAG_DIGALGID_NULL\s0\fR" 4
+.IX Item "EVP_MD_FLAG_DIGALGID_NULL"
+When setting up a DigestAlgorithmIdentifier, this flag will have the
+parameter set to \s-1NULL\s0 by default. Use this for PKCS#1. \fINote: if
+combined with \s-1EVP_MD_FLAG_DIGALGID_ABSENT,\s0 the latter will override.\fR
+.IP "\fB\s-1EVP_MD_FLAG_DIGALGID_ABSENT\s0\fR" 4
+.IX Item "EVP_MD_FLAG_DIGALGID_ABSENT"
+When setting up a DigestAlgorithmIdentifier, this flag will have the
+parameter be left absent by default. \fINote: if combined with
+\&\s-1EVP_MD_FLAG_DIGALGID_NULL,\s0 the latter will be overridden.\fR
+.IP "\fB\s-1EVP_MD_FLAG_DIGALGID_CUSTOM\s0\fR" 4
+.IX Item "EVP_MD_FLAG_DIGALGID_CUSTOM"
+Custom DigestAlgorithmIdentifier handling via ctrl, with
+\&\fB\s-1EVP_MD_FLAG_DIGALGID_ABSENT\s0\fR as default. \fINote: if combined with
+\&\s-1EVP_MD_FLAG_DIGALGID_NULL,\s0 the latter will be overridden.\fR
+Currently unused.
+.RE
+.RS 4
+.Sp
+The length of the \*(L"flags\*(R" parameter should equal that of an
+\&\fBunsigned long int\fR.
+.RE
+.SS "Digest Context Parameters"
+.IX Subsection "Digest Context Parameters"
+\&\fBOSSL_FUNC_digest_set_ctx_params()\fR sets digest parameters associated with the
+given provider side digest context \fIdctx\fR to \fIparams\fR.
+Any parameter settings are additional to any that were previously set.
+See \s-1\fBOSSL_PARAM\s0\fR\|(3) for further details on the parameters structure.
+.PP
+\&\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\-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>.