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-.\" $OpenBSD: EVP_PKEY_verify.3,v 1.8 2024/12/06 14:27:49 schwarze Exp $
-.\" full merge up to: OpenSSL 48e5119a Jan 19 10:49:22 2018 +0100
-.\"
-.\" This file was written by Dr. Stephen Henson <steve@openssl.org>.
-.\" Copyright (c) 2006, 2009, 2010, 2013, 2018 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,
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-.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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-.\"
-.Dd $Mdocdate: December 6 2024 $
-.Dt EVP_PKEY_VERIFY 3
-.Os
-.Sh NAME
-.Nm EVP_PKEY_verify_init ,
-.Nm EVP_PKEY_verify
-.Nd signature verification using a public key algorithm
-.Sh SYNOPSIS
-.In openssl/evp.h
-.Ft int
-.Fo EVP_PKEY_verify_init
-.Fa "EVP_PKEY_CTX *ctx"
-.Fc
-.Ft int
-.Fo EVP_PKEY_verify
-.Fa "EVP_PKEY_CTX *ctx"
-.Fa "const unsigned char *sig"
-.Fa "size_t siglen"
-.Fa "const unsigned char *tbs"
-.Fa "size_t tbslen"
-.Fc
-.Sh DESCRIPTION
-The
-.Fn EVP_PKEY_verify_init
-function initializes a public key algorithm context using key
-.Fa ctx->pkey
-for a signature verification operation.
-.Pp
-The
-.Fn EVP_PKEY_verify
-function performs a public key verification operation using
-.Fa ctx .
-The signature is specified using the
-.Fa sig
-and
-.Fa siglen
-parameters.
-The verified data (i.e. the data believed originally signed) is
-specified using the
-.Fa tbs
-and
-.Fa tbslen
-parameters.
-.Pp
-After the call to
-.Fn EVP_PKEY_verify_init ,
-algorithm specific control operations can be performed to set any
-appropriate parameters for the operation.
-.Pp
-The function
-.Fn EVP_PKEY_verify
-can be called more than once on the same context if several operations
-are performed using the same parameters.
-.Sh RETURN VALUES
-.Fn EVP_PKEY_verify_init
-and
-.Fn EVP_PKEY_verify
-return 1 if the verification was successful and 0 if it failed.
-Unlike other functions the return value 0 from
-.Fn EVP_PKEY_verify
-only indicates that the signature did not verify successfully.
-That is,
-.Fa tbs
-did not match the original data or the signature was of invalid form.
-It is not an indication of a more serious error.
-.Pp
-A negative value indicates an error other that signature verification
-failure.
-In particular, a return value of -2 indicates the operation is not
-supported by the public key algorithm.
-.Sh EXAMPLES
-Verify signature using PKCS#1 and SHA256 digest:
-.Bd -literal -offset 3n
-#include <openssl/evp.h>
-#include <openssl/rsa.h>
-
-EVP_PKEY_CTX *ctx;
-unsigned char *md, *sig;
-size_t mdlen, siglen;
-EVP_PKEY *verify_key;
-
-/*
- * Assumes that verify_key, sig, siglen, md, and mdlen are already set up
- * and that verify_key is an RSA public key.
- */
-ctx = EVP_PKEY_CTX_new(verify_key, NULL);
-if (!ctx)
-        /* Error occurred */
-if (EVP_PKEY_verify_init(ctx) <= 0)
-        /* Error */
-if (EVP_PKEY_CTX_set_rsa_padding(ctx, RSA_PKCS1_PADDING) <= 0)
-        /* Error */
-if (EVP_PKEY_CTX_set_signature_md(ctx, EVP_sha256()) <= 0)
-        /* Error */
-
-/* Perform operation */
-ret = EVP_PKEY_verify(ctx, sig, siglen, md, mdlen);
-
-/*
- * ret == 1 indicates success, 0 verify failure,
- * and < 0 some other error.
- */
-.Ed
-.Sh SEE ALSO
-.Xr EVP_PKEY_CTX_new 3 ,
-.Xr EVP_PKEY_decrypt 3 ,
-.Xr EVP_PKEY_derive 3 ,
-.Xr EVP_PKEY_encrypt 3 ,
-.Xr EVP_PKEY_sign 3 ,
-.Xr EVP_PKEY_verify_recover 3
-.Sh HISTORY
-.Fn EVP_PKEY_verify_init
-and
-.Fn EVP_PKEY_verify
-first appeared in OpenSSL 1.0.0 and have been available since
-.Ox 4.9 .