/* crypto/evp/p_verify.c */

/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)

 * All rights reserved.

 *

 * This package is an SSL implementation written

 * by Eric Young (eay@cryptsoft.com).

 * The implementation was written so as to conform with Netscapes SSL.

 *

 * This library is free for commercial and non-commercial use as long as

 * the following conditions are aheared to.  The following conditions

 * apply to all code found in this distribution, be it the RC4, RSA,

 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation

 * included with this distribution is covered by the same copyright terms

 * except that the holder is Tim Hudson (tjh@cryptsoft.com).

 *

 * Copyright remains Eric Young's, and as such any Copyright notices in

 * the code are not to be removed.

 * If this package is used in a product, Eric Young should be given attribution

 * as the author of the parts of the library used.

 * This can be in the form of a textual message at program startup or

 * in documentation (online or textual) provided with the package.

 *

 * 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 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 acknowledgement:

 *    "This product includes cryptographic software written by

 *     Eric Young (eay@cryptsoft.com)"

 *    The word 'cryptographic' can be left out if the rouines from the library

 *    being used are not cryptographic related :-).

 * 4. If you include any Windows specific code (or a derivative thereof) from

 *    the apps directory (application code) you must include an acknowledgement:

 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"

 *

 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND

 * ANY EXPRESS 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 AUTHOR OR 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.

 *

 * The licence and distribution terms for any publically available version or

 * derivative of this code cannot be changed.  i.e. this code cannot simply be

 * copied and put under another distribution licence

 * [including the GNU Public Licence.]

 */

#include <stdio.h>

#include "cryptlib.h"

#include <openssl/evp.h>

#include <openssl/objects.h>

#include <openssl/x509.h>

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

                    unsigned int siglen, EVP_PKEY *pkey)

{

    unsigned char m[EVP_MAX_MD_SIZE];

    unsigned int m_len;

    int i = 0, ok = 0, v;

    EVP_MD_CTX tmp_ctx;

    EVP_PKEY_CTX *pkctx = NULL;

    EVP_MD_CTX_init(&tmp_ctx);

    if (!EVP_MD_CTX_copy_ex(&tmp_ctx, ctx))

        goto err;

    if (!EVP_DigestFinal_ex(&tmp_ctx, &(m[0]), &m_len))

        goto err;

    EVP_MD_CTX_cleanup(&tmp_ctx);

    if (ctx->digest->flags & EVP_MD_FLAG_PKEY_METHOD_SIGNATURE) {

        i = -1;

        pkctx = EVP_PKEY_CTX_new(pkey, NULL);

        if (!pkctx)

            goto err;

        if (EVP_PKEY_verify_init(pkctx) <= 0)

            goto err;

        if (EVP_PKEY_CTX_set_signature_md(pkctx, ctx->digest) <= 0)

            goto err;

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

 err:

        EVP_PKEY_CTX_free(pkctx);

        return i;

    }

    for (i = 0; i < 4; i++) {

        v = ctx->digest->required_pkey_type[i];

        if (v == 0)

            break;

        if (pkey->type == v) {

            ok = 1;

            break;

        }

    }

    if (!ok) {

        EVPerr(EVP_F_EVP_VERIFYFINAL, EVP_R_WRONG_PUBLIC_KEY_TYPE);

        return (-1);

    }

    if (ctx->digest->verify == NULL) {

        EVPerr(EVP_F_EVP_VERIFYFINAL, EVP_R_NO_VERIFY_FUNCTION_CONFIGURED);

        return (0);

    }

    return (ctx->digest->verify(ctx->digest->type, m, m_len,

                                sigbuf, siglen, pkey->pkey.ptr));

}