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NAMEEVP_PKEY_verify_init, 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(EVP_PKEY_CTX *ctx, const unsigned char *sig, size_t siglen, const unsigned char *tbs, size_t tbslen);
DESCRIPTIONThe The
NOTESAfter the call to The function
RETURN VALUES
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.
EXAMPLESVerify 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 ALSOEVP_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)
HISTORYThese functions were added in OpenSSL 1.0.0.
COPYRIGHTCopyright 2006-2019 The OpenSSL Project Authors. All Rights Reserved. Licensed under the OpenSSL license (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. |
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