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-.\" $OpenBSD: EVP_DigestVerifyInit.3,v 1.17 2024/12/06 14:27:49 schwarze Exp $
-.\" full merge up to OpenSSL f097e875 Aug 23 11:37:22 2018 +0100
-.\" selective merge up to 24a535ea Sep 22 13:14:20 2020 +0100
-.\"
-.\" This file was written by Dr. Stephen Henson <steve@openssl.org>.
-.\" Copyright (c) 2006, 2009, 2014, 2015, 2016, 2017 The OpenSSL Project.
-.\" All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\"
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\"
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in
-.\"    the documentation and/or other materials provided with the
-.\"    distribution.
-.\"
-.\" 3. All advertising materials mentioning features or use of this
-.\"    software must display the following acknowledgment:
-.\"    "This product includes software developed by the OpenSSL Project
-.\"    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
-.\"
-.\" 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
-.\"    endorse or promote products derived from this software without
-.\"    prior written permission. For written permission, please contact
-.\"    openssl-core@openssl.org.
-.\"
-.\" 5. Products derived from this software may not be called "OpenSSL"
-.\"    nor may "OpenSSL" appear in their names without prior written
-.\"    permission of the OpenSSL Project.
-.\"
-.\" 6. Redistributions of any form whatsoever must retain the following
-.\"    acknowledgment:
-.\"    "This product includes software developed by the OpenSSL Project
-.\"    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
-.\" EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
-.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
-.\" ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-.\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
-.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
-.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
-.\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
-.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
-.\" OF THE POSSIBILITY OF SUCH DAMAGE.
-.\"
-.Dd $Mdocdate: December 6 2024 $
-.Dt EVP_DIGESTVERIFYINIT 3
-.Os
-.Sh NAME
-.Nm EVP_DigestVerifyInit ,
-.Nm EVP_DigestVerifyUpdate ,
-.Nm EVP_DigestVerifyFinal ,
-.Nm EVP_DigestVerify
-.Nd EVP signature verification functions
-.Sh SYNOPSIS
-.In openssl/evp.h
-.Ft int
-.Fo EVP_DigestVerifyInit
-.Fa "EVP_MD_CTX *ctx"
-.Fa "EVP_PKEY_CTX **pctx"
-.Fa "const EVP_MD *type"
-.Fa "ENGINE *engine"
-.Fa "EVP_PKEY *pkey"
-.Fc
-.Ft int
-.Fo EVP_DigestVerifyUpdate
-.Fa "EVP_MD_CTX *ctx"
-.Fa "const void *d"
-.Fa "size_t cnt"
-.Fc
-.Ft int
-.Fo EVP_DigestVerifyFinal
-.Fa "EVP_MD_CTX *ctx"
-.Fa "const unsigned char *sig"
-.Fa "size_t siglen"
-.Fc
-.Ft int
-.Fo EVP_DigestVerify
-.Fa "EVP_MD_CTX *ctx"
-.Fa "const unsigned char *sig"
-.Fa "size_t siglen"
-.Fa "const unsigned char *tbs"
-.Fa "size_t *tbslen"
-.Fc
-.Sh DESCRIPTION
-The EVP signature routines are a high-level interface to digital
-signatures.
-.Pp
-.Fn EVP_DigestVerifyInit
-sets up the verification context
-.Fa ctx
-to use the digest
-.Fa type
-and the public key
-.Fa pkey .
-Before calling this function, obtain
-.Fa ctx
-from
-.Xr EVP_MD_CTX_new 3
-or call
-.Xr EVP_MD_CTX_reset 3
-on it.
-The
-.Fa engine
-argument is always ignored and passing
-.Dv NULL
-is recommended.
-.Pp
-If
-.Fa pctx
-is not
-.Dv NULL ,
-any pointer passed in as
-.Pf * Fa pctx
-is ignored and overwritten by an internal pointer to the
-.Vt EVP_PKEY_CTX
-used by the verification operation:
-this can be used to set alternative signing options.
-The returned
-.Vt EVP_PKEY_CTX
-must not be freed by the application.
-It is freed automatically when the
-.Vt EVP_MD_CTX
-is freed.
-.Pp
-.Fn EVP_DigestVerifyUpdate
-hashes
-.Fa cnt
-bytes of data at
-.Fa d
-into the verification context
-.Fa ctx .
-This function can be called several times on the same
-.Fa ctx
-to include additional data.
-This function is currently implemented using a macro.
-.Pp
-.Fn EVP_DigestVerifyFinal
-verifies the data in
-.Fa ctx
-against the signature in
-.Fa sig
-of length
-.Fa siglen .
-.Pp
-.Fn EVP_DigestVerify
-verifies
-.Fa tbslen
-bytes at
-.Fa tbs
-against the signature in
-.Fa sig
-of length
-.Fa siglen .
-.Fn EVP_DigestVerify
-is a one shot operation which verifies a single block of data
-in one function call.
-For algorithms that support streaming it is equivalent to calling
-.Fn EVP_DigestVerifyUpdate
-and
-.Fn EVP_DigestVerifyFinal .
-.\" For algorithms which do not support streaming
-.\" (e.g. PureEdDSA)
-.\" it is the only way to verify data.
-.Pp
-The EVP interface to digital signatures should almost always be
-used in preference to the low-level interfaces.
-This is because the code then becomes transparent to the algorithm used
-and much more flexible.
-.Pp
-The call to
-.Fn EVP_DigestVerifyFinal
-internally finalizes a copy of the digest context.
-This means that
-.Xr EVP_VerifyUpdate 3
-and
-.Xr EVP_VerifyFinal 3
-can be called later to digest and verify additional data.
-.Pp
-Since only a copy of the digest context is ever finalized, the context
-must be cleaned up after use by calling
-.Xr EVP_MD_CTX_free 3
-or a memory leak will occur.
-.Sh RETURN VALUES
-.Fn EVP_DigestVerifyInit
-and
-.Fn EVP_DigestVerifyUpdate
-return 1 for success and 0 for failure.
-.Pp
-.Fn EVP_DigestVerifyFinal
-and
-.Fn EVP_DigestVerify
-return 1 for success; any other value indicates failure.
-A return value of 0 indicates that the signature did not verify
-successfully (that is, the signature did not match the original
-data or the signature had an invalid form), while other values
-indicate a more serious error (and sometimes also indicate an invalid
-signature form).
-.Pp
-The error codes can be obtained from
-.Xr ERR_get_error 3 .
-.Sh SEE ALSO
-.Xr evp 3 ,
-.Xr EVP_DigestInit 3 ,
-.Xr EVP_DigestSignInit 3
-.Sh HISTORY
-.Fn EVP_DigestVerifyInit ,
-.Fn EVP_DigestVerifyUpdate ,
-and
-.Fn EVP_DigestVerifyFinal
-first appeared in OpenSSL 1.0.0 and have been available since
-.Ox 4.9 .
-.Pp
-.Fn EVP_DigestVerify
-first appeared in OpenSSL 1.1.1 and has been available since
-.Ox 7.0 .