/*

 * Copyright 1995-2021 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

 */

#include <stdio.h>

#include "internal/cryptlib.h"

#include <openssl/evp.h>

#include <openssl/objects.h>

#include <openssl/x509.h>

#include "crypto/evp.h"

int EVP_VerifyFinal_ex(EVP_MD_CTX *ctx, const unsigned char *sigbuf,

                       unsigned int siglen, EVP_PKEY *pkey, OSSL_LIB_CTX *libctx,

                       const char *propq)

{

    unsigned char m[EVP_MAX_MD_SIZE];

    unsigned int m_len = 0;

    int i = 0;

    EVP_PKEY_CTX *pkctx = NULL;

    if (EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_FINALISE)) {

        if (!EVP_DigestFinal_ex(ctx, m, &m_len))

            goto err;

    } else {

        int rv = 0;

        EVP_MD_CTX *tmp_ctx = EVP_MD_CTX_new();

        if (tmp_ctx == NULL) {

            ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);

            return 0;

        }

        rv = EVP_MD_CTX_copy_ex(tmp_ctx, ctx);

        if (rv)

            rv = EVP_DigestFinal_ex(tmp_ctx, m, &m_len);

        EVP_MD_CTX_free(tmp_ctx);

        if (!rv)

            return 0;

    }

    i = -1;

    pkctx = EVP_PKEY_CTX_new_from_pkey(libctx, pkey, propq);

    if (pkctx == NULL)

        goto err;

    if (EVP_PKEY_verify_init(pkctx) <= 0)

        goto err;

    if (EVP_PKEY_CTX_set_signature_md(pkctx, EVP_MD_CTX_get0_md(ctx)) <= 0)

        goto err;

    i = EVP_PKEY_verify(pkctx, sigbuf, siglen, m, m_len);

 err:

    EVP_PKEY_CTX_free(pkctx);

    return i;

}

int EVP_VerifyFinal(EVP_MD_CTX *ctx, const unsigned char *sigbuf,

                    unsigned int siglen, EVP_PKEY *pkey)

{

    return EVP_VerifyFinal_ex(ctx, sigbuf, siglen, pkey, NULL, NULL);

}