EVP_PKEY_VERIFY(3ossl) OpenSSL EVP_PKEY_VERIFY(3ossl)
NAME
EVP_PKEY_verify_init, EVP_PKEY_verify_init_ex, EVP_PKEY_verify -
signature verification using a public key algorithm
SYNOPSIS
#include <openssl/evp.h>
int EVP_PKEY_verify_init(EVP_PKEY_CTX *ctx);
int EVP_PKEY_verify_init_ex(EVP_PKEY_CTX *ctx, const OSSL_PARAM params[]);
int EVP_PKEY_verify(EVP_PKEY_CTX *ctx,
const unsigned char *sig, size_t siglen,
const unsigned char *tbs, size_t tbslen);
DESCRIPTION
EVP_PKEY_verify_init() initializes a public key algorithm context ctx
for signing using the algorithm given when the context was created
using EVP_PKEY_CTX_new(3) or variants thereof. The algorithm is used
to fetch a EVP_SIGNATURE method implicitly, see "Implicit fetch" in
provider(7) for more information about implicit fetches.
EVP_PKEY_verify_init_ex() is the same as EVP_PKEY_verify_init() but
additionally sets the passed parameters params on the context before
returning.
The EVP_PKEY_verify(3) function performs a public key verification
operation using ctx. The signature is specified using the sig and
siglen parameters. The verified data (i.e. the data believed originally
signed) is specified using the tbs and tbslen parameters.
NOTES
After the call to EVP_PKEY_verify_init() algorithm specific control
operations can be performed to set any appropriate parameters for the
operation.
The function EVP_PKEY_verify(3) can be called more than once on the same
context if several operations are performed using the same parameters.
RETURN VALUES
EVP_PKEY_verify(3) return 1 if the
verification was successful and 0 if it failed. Unlike other functions
the return value 0 from EVP_PKEY_verify(3) only indicates that the
signature did not verify successfully (that is tbs did not match the
original data or the signature was of invalid form) it is not an
indication of a more serious error.
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.
EXAMPLES
Verify signature using PKCS#1 and SHA256 digest:
#include <openssl/evp.h>
#include <openssl/rsa.h>
EVP_PKEY_CTX *ctx;
unsigned char *md, *sig;
size_t mdlen, siglen;
EVP_PKEY *verify_key;
/*
* NB: assumes 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 /* no engine */);
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 for some
* other error.
*/
SEE ALSO
EVP_PKEY_CTX_new(3), EVP_PKEY_encrypt(3), EVP_PKEY_decrypt(3),
EVP_PKEY_sign(3), EVP_PKEY_verify_recover(3), EVP_PKEY_derive(3)
HISTORY
The EVP_PKEY_verify(3) functions were added
in OpenSSL 1.0.0.
The EVP_PKEY_verify_init_ex() function was added in OpenSSL 3.0.
COPYRIGHT
Copyright 2006-2021 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the Apache License 2.0 (the "License"). You may not use
this file except in compliance with the License. You can obtain a copy
in the file LICENSE in the source distribution or at
<https://www.openssl.org/source/license.html>.
3.3.2 2024-09-04 EVP_PKEY_VERIFY(3ossl)
openssl 3.3.2 - Generated Sat Sep 14 08:31:51 CDT 2024