crypto/cms/cms_dd.c

/* crypto/cms/cms_dd.c */
/*
 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
 * project.
 */
/* ====================================================================
 * Copyright (c) 2008 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
 *    licensing@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,
 * 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.
 * ====================================================================
 */

#include "internal/cryptlib.h"
#include <openssl/asn1t.h>
#include <openssl/pem.h>
#include <openssl/x509v3.h>
#include <openssl/err.h>
#include <openssl/cms.h>
#include "cms_lcl.h"

/* CMS DigestedData Utilities */

CMS_ContentInfo *cms_DigestedData_create(const EVP_MD *md)
{
    CMS_ContentInfo *cms;
    CMS_DigestedData *dd;
    cms = CMS_ContentInfo_new();
    if (cms == NULL)
        return NULL;

    dd = M_ASN1_new_of(CMS_DigestedData);

    if (dd == NULL)
        goto err;

    cms->contentType = OBJ_nid2obj(NID_pkcs7_digest);
    cms->d.digestedData = dd;

    dd->version = 0;
    dd->encapContentInfo->eContentType = OBJ_nid2obj(NID_pkcs7_data);

    X509_ALGOR_set_md(dd->digestAlgorithm, md);

    return cms;

 err:
    CMS_ContentInfo_free(cms);
    return NULL;
}

BIO *cms_DigestedData_init_bio(CMS_ContentInfo *cms)
{
    CMS_DigestedData *dd;
    dd = cms->d.digestedData;
    return cms_DigestAlgorithm_init_bio(dd->digestAlgorithm);
}

int cms_DigestedData_do_final(CMS_ContentInfo *cms, BIO *chain, int verify)
{
    EVP_MD_CTX *mctx = EVP_MD_CTX_new();
    unsigned char md[EVP_MAX_MD_SIZE];
    unsigned int mdlen;
    int r = 0;
    CMS_DigestedData *dd;

    if (mctx == NULL) {
        CMSerr(CMS_F_CMS_DIGESTEDDATA_DO_FINAL, ERR_R_MALLOC_FAILURE);
        goto err;
    }

    dd = cms->d.digestedData;

    if (!cms_DigestAlgorithm_find_ctx(mctx, chain, dd->digestAlgorithm))
        goto err;

    if (EVP_DigestFinal_ex(mctx, md, &mdlen) <= 0)
        goto err;

    if (verify) {
        if (mdlen != (unsigned int)dd->digest->length) {
            CMSerr(CMS_F_CMS_DIGESTEDDATA_DO_FINAL,
                   CMS_R_MESSAGEDIGEST_WRONG_LENGTH);
            goto err;
        }

        if (memcmp(md, dd->digest->data, mdlen))
            CMSerr(CMS_F_CMS_DIGESTEDDATA_DO_FINAL,
                   CMS_R_VERIFICATION_FAILURE);
        else
            r = 1;
    } else {
        if (!ASN1_STRING_set(dd->digest, md, mdlen))
            goto err;
        r = 1;
    }

 err:
    EVP_MD_CTX_free(mctx);

    return r;

}