crypto/cms/cms_ess.c - third_party/openssl - Git at Google

 /*
  * Copyright 2008-2021 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 "internal/cryptlib.h"
 #include <openssl/asn1t.h>
 #include <openssl/pem.h>
 #include <openssl/rand.h>
 #include <openssl/x509v3.h>
 #include <openssl/err.h>
 #include <openssl/cms.h>
 #include <openssl/ess.h>
 #include "crypto/ess.h"
 #include "crypto/x509.h"
 #include "cms_local.h"

 IMPLEMENT_ASN1_FUNCTIONS(CMS_ReceiptRequest)

 /* ESS services */

 int CMS_get1_ReceiptRequest(CMS_SignerInfo *si, CMS_ReceiptRequest **prr)
 {
     ASN1_STRING *str;
     CMS_ReceiptRequest *rr;
     ASN1_OBJECT *obj = OBJ_nid2obj(NID_id_smime_aa_receiptRequest);

     if (prr != NULL)
         *prr = NULL;
     str = CMS_signed_get0_data_by_OBJ(si, obj, -3, V_ASN1_SEQUENCE);
     if (str == NULL)
         return 0;

     rr = ASN1_item_unpack(str, ASN1_ITEM_rptr(CMS_ReceiptRequest));
     if (rr == NULL)
         return -1;
     if (prr != NULL)
         *prr = rr;
     else
         CMS_ReceiptRequest_free(rr);
     return 1;
 }

 /*
  * Returns 0 if attribute is not found, 1 if found,
  * or -1 on attribute parsing failure.
  */
 static int ossl_cms_signerinfo_get_signing_cert(const CMS_SignerInfo *si,
                                                 ESS_SIGNING_CERT **psc)
 {
     ASN1_STRING *str;
     ESS_SIGNING_CERT *sc;
     ASN1_OBJECT *obj = OBJ_nid2obj(NID_id_smime_aa_signingCertificate);

     if (psc != NULL)
         *psc = NULL;
     str = CMS_signed_get0_data_by_OBJ(si, obj, -3, V_ASN1_SEQUENCE);
     if (str == NULL)
         return 0;

     sc = ASN1_item_unpack(str, ASN1_ITEM_rptr(ESS_SIGNING_CERT));
     if (sc == NULL)
         return -1;
     if (psc != NULL)
         *psc = sc;
     else
         ESS_SIGNING_CERT_free(sc);
     return 1;
 }

 /*
  * Returns 0 if attribute is not found, 1 if found,
  * or -1 on attribute parsing failure.
  */
 static int ossl_cms_signerinfo_get_signing_cert_v2(const CMS_SignerInfo *si,
                                                    ESS_SIGNING_CERT_V2 **psc)
 {
     ASN1_STRING *str;
     ESS_SIGNING_CERT_V2 *sc;
     ASN1_OBJECT *obj = OBJ_nid2obj(NID_id_smime_aa_signingCertificateV2);

     if (psc != NULL)
         *psc = NULL;
     str = CMS_signed_get0_data_by_OBJ(si, obj, -3, V_ASN1_SEQUENCE);
     if (str == NULL)
         return 0;

     sc = ASN1_item_unpack(str, ASN1_ITEM_rptr(ESS_SIGNING_CERT_V2));
     if (sc == NULL)
         return -1;
     if (psc != NULL)
         *psc = sc;
     else
         ESS_SIGNING_CERT_V2_free(sc);
     return 1;
 }

 int ossl_cms_check_signing_certs(const CMS_SignerInfo *si,
                                  const STACK_OF(X509) *chain)
 {
     ESS_SIGNING_CERT *ss = NULL;
     ESS_SIGNING_CERT_V2 *ssv2 = NULL;
     int ret = ossl_cms_signerinfo_get_signing_cert(si, &ss) >= 0
         && ossl_cms_signerinfo_get_signing_cert_v2(si, &ssv2) >= 0
         && OSSL_ESS_check_signing_certs(ss, ssv2, chain, 1) > 0;

     ESS_SIGNING_CERT_free(ss);
     ESS_SIGNING_CERT_V2_free(ssv2);
     return ret;
 }

 CMS_ReceiptRequest *CMS_ReceiptRequest_create0_ex(
     unsigned char *id, int idlen, int allorfirst,
     STACK_OF(GENERAL_NAMES) *receiptList, STACK_OF(GENERAL_NAMES) *receiptsTo,
     OSSL_LIB_CTX *libctx)
 {
     CMS_ReceiptRequest *rr;

     rr = CMS_ReceiptRequest_new();
     if (rr == NULL)
         goto merr;
     if (id)
         ASN1_STRING_set0(rr->signedContentIdentifier, id, idlen);
     else {
         if (!ASN1_STRING_set(rr->signedContentIdentifier, NULL, 32))
             goto merr;
         if (RAND_bytes_ex(libctx, rr->signedContentIdentifier->data, 32,
                           0) <= 0)
             goto err;
     }

     sk_GENERAL_NAMES_pop_free(rr->receiptsTo, GENERAL_NAMES_free);
     rr->receiptsTo = receiptsTo;

     if (receiptList != NULL) {
         rr->receiptsFrom->type = 1;
         rr->receiptsFrom->d.receiptList = receiptList;
     } else {
         rr->receiptsFrom->type = 0;
         rr->receiptsFrom->d.allOrFirstTier = allorfirst;
     }

     return rr;

  merr:
     ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);

  err:
     CMS_ReceiptRequest_free(rr);
     return NULL;

 }

 CMS_ReceiptRequest *CMS_ReceiptRequest_create0(
     unsigned char *id, int idlen, int allorfirst,
     STACK_OF(GENERAL_NAMES) *receiptList, STACK_OF(GENERAL_NAMES) *receiptsTo)
 {
     return CMS_ReceiptRequest_create0_ex(id, idlen, allorfirst, receiptList,
                                          receiptsTo, NULL);
 }

 int CMS_add1_ReceiptRequest(CMS_SignerInfo *si, CMS_ReceiptRequest *rr)
 {
     unsigned char *rrder = NULL;
     int rrderlen, r = 0;

     rrderlen = i2d_CMS_ReceiptRequest(rr, &rrder);
     if (rrderlen < 0)
         goto merr;

     if (!CMS_signed_add1_attr_by_NID(si, NID_id_smime_aa_receiptRequest,
                                      V_ASN1_SEQUENCE, rrder, rrderlen))
         goto merr;

     r = 1;

  merr:
     if (!r)
         ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);

     OPENSSL_free(rrder);

     return r;

 }

 void CMS_ReceiptRequest_get0_values(CMS_ReceiptRequest *rr,
                                     ASN1_STRING **pcid,
                                     int *pallorfirst,
                                     STACK_OF(GENERAL_NAMES) **plist,
                                     STACK_OF(GENERAL_NAMES) **prto)
 {
     if (pcid != NULL)
         *pcid = rr->signedContentIdentifier;
     if (rr->receiptsFrom->type == 0) {
         if (pallorfirst != NULL)
             *pallorfirst = (int)rr->receiptsFrom->d.allOrFirstTier;
         if (plist != NULL)
             *plist = NULL;
     } else {
         if (pallorfirst != NULL)
             *pallorfirst = -1;
         if (plist != NULL)
             *plist = rr->receiptsFrom->d.receiptList;
     }
     if (prto != NULL)
         *prto = rr->receiptsTo;
 }

 /* Digest a SignerInfo structure for msgSigDigest attribute processing */

 static int cms_msgSigDigest(CMS_SignerInfo *si,
                             unsigned char *dig, unsigned int *diglen)
 {
     const EVP_MD *md = EVP_get_digestbyobj(si->digestAlgorithm->algorithm);

     if (md == NULL)
         return 0;
     if (!ossl_asn1_item_digest_ex(ASN1_ITEM_rptr(CMS_Attributes_Verify), md,
                                   si->signedAttrs, dig, diglen,
                                   ossl_cms_ctx_get0_libctx(si->cms_ctx),
                                   ossl_cms_ctx_get0_propq(si->cms_ctx)))
         return 0;
     return 1;
 }

 /* Add a msgSigDigest attribute to a SignerInfo */

 int ossl_cms_msgSigDigest_add1(CMS_SignerInfo *dest, CMS_SignerInfo *src)
 {
     unsigned char dig[EVP_MAX_MD_SIZE];
     unsigned int diglen;

     if (!cms_msgSigDigest(src, dig, &diglen)) {
         ERR_raise(ERR_LIB_CMS, CMS_R_MSGSIGDIGEST_ERROR);
         return 0;
     }
     if (!CMS_signed_add1_attr_by_NID(dest, NID_id_smime_aa_msgSigDigest,
                                      V_ASN1_OCTET_STRING, dig, diglen)) {
         ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
         return 0;
     }
     return 1;
 }

 /* Verify signed receipt after it has already passed normal CMS verify */

 int ossl_cms_Receipt_verify(CMS_ContentInfo *cms, CMS_ContentInfo *req_cms)
 {
     int r = 0, i;
     CMS_ReceiptRequest *rr = NULL;
     CMS_Receipt *rct = NULL;
     STACK_OF(CMS_SignerInfo) *sis, *osis;
     CMS_SignerInfo *si, *osi = NULL;
     ASN1_OCTET_STRING *msig, **pcont;
     ASN1_OBJECT *octype;
     unsigned char dig[EVP_MAX_MD_SIZE];
     unsigned int diglen;

     /* Get SignerInfos, also checks SignedData content type */
     osis = CMS_get0_SignerInfos(req_cms);
     sis = CMS_get0_SignerInfos(cms);
     if (!osis || !sis)
         goto err;

     if (sk_CMS_SignerInfo_num(sis) != 1) {
         ERR_raise(ERR_LIB_CMS, CMS_R_NEED_ONE_SIGNER);
         goto err;
     }

     /* Check receipt content type */
     if (OBJ_obj2nid(CMS_get0_eContentType(cms)) != NID_id_smime_ct_receipt) {
         ERR_raise(ERR_LIB_CMS, CMS_R_NOT_A_SIGNED_RECEIPT);
         goto err;
     }

     /* Extract and decode receipt content */
     pcont = CMS_get0_content(cms);
     if (pcont == NULL || *pcont == NULL) {
         ERR_raise(ERR_LIB_CMS, CMS_R_NO_CONTENT);
         goto err;
     }

     rct = ASN1_item_unpack(*pcont, ASN1_ITEM_rptr(CMS_Receipt));

     if (!rct) {
         ERR_raise(ERR_LIB_CMS, CMS_R_RECEIPT_DECODE_ERROR);
         goto err;
     }

     /* Locate original request */

     for (i = 0; i < sk_CMS_SignerInfo_num(osis); i++) {
         osi = sk_CMS_SignerInfo_value(osis, i);
         if (!ASN1_STRING_cmp(osi->signature, rct->originatorSignatureValue))
             break;
     }

     if (i == sk_CMS_SignerInfo_num(osis)) {
         ERR_raise(ERR_LIB_CMS, CMS_R_NO_MATCHING_SIGNATURE);
         goto err;
     }

     si = sk_CMS_SignerInfo_value(sis, 0);

     /* Get msgSigDigest value and compare */

     msig = CMS_signed_get0_data_by_OBJ(si,
                                        OBJ_nid2obj
                                        (NID_id_smime_aa_msgSigDigest), -3,
                                        V_ASN1_OCTET_STRING);

     if (!msig) {
         ERR_raise(ERR_LIB_CMS, CMS_R_NO_MSGSIGDIGEST);
         goto err;
     }

     if (!cms_msgSigDigest(osi, dig, &diglen)) {
         ERR_raise(ERR_LIB_CMS, CMS_R_MSGSIGDIGEST_ERROR);
         goto err;
     }

     if (diglen != (unsigned int)msig->length) {
         ERR_raise(ERR_LIB_CMS, CMS_R_MSGSIGDIGEST_WRONG_LENGTH);
         goto err;
     }

     if (memcmp(dig, msig->data, diglen)) {
         ERR_raise(ERR_LIB_CMS, CMS_R_MSGSIGDIGEST_VERIFICATION_FAILURE);
         goto err;
     }

     /* Compare content types */

     octype = CMS_signed_get0_data_by_OBJ(osi,
                                          OBJ_nid2obj(NID_pkcs9_contentType),
                                          -3, V_ASN1_OBJECT);
     if (!octype) {
         ERR_raise(ERR_LIB_CMS, CMS_R_NO_CONTENT_TYPE);
         goto err;
     }

     /* Compare details in receipt request */

     if (OBJ_cmp(octype, rct->contentType)) {
         ERR_raise(ERR_LIB_CMS, CMS_R_CONTENT_TYPE_MISMATCH);
         goto err;
     }

     /* Get original receipt request details */

     if (CMS_get1_ReceiptRequest(osi, &rr) <= 0) {
         ERR_raise(ERR_LIB_CMS, CMS_R_NO_RECEIPT_REQUEST);
         goto err;
     }

     if (ASN1_STRING_cmp(rr->signedContentIdentifier,
                         rct->signedContentIdentifier)) {
         ERR_raise(ERR_LIB_CMS, CMS_R_CONTENTIDENTIFIER_MISMATCH);
         goto err;
     }

     r = 1;

  err:
     CMS_ReceiptRequest_free(rr);
     M_ASN1_free_of(rct, CMS_Receipt);
     return r;

 }

 /*
  * Encode a Receipt into an OCTET STRING read for including into content of a
  * SignedData ContentInfo.
  */

 ASN1_OCTET_STRING *ossl_cms_encode_Receipt(CMS_SignerInfo *si)
 {
     CMS_Receipt rct;
     CMS_ReceiptRequest *rr = NULL;
     ASN1_OBJECT *ctype;
     ASN1_OCTET_STRING *os = NULL;

     /* Get original receipt request */

     /* Get original receipt request details */

     if (CMS_get1_ReceiptRequest(si, &rr) <= 0) {
         ERR_raise(ERR_LIB_CMS, CMS_R_NO_RECEIPT_REQUEST);
         goto err;
     }

     /* Get original content type */

     ctype = CMS_signed_get0_data_by_OBJ(si,
                                         OBJ_nid2obj(NID_pkcs9_contentType),
                                         -3, V_ASN1_OBJECT);
     if (!ctype) {
         ERR_raise(ERR_LIB_CMS, CMS_R_NO_CONTENT_TYPE);
         goto err;
     }

     rct.version = 1;
     rct.contentType = ctype;
     rct.signedContentIdentifier = rr->signedContentIdentifier;
     rct.originatorSignatureValue = si->signature;

     os = ASN1_item_pack(&rct, ASN1_ITEM_rptr(CMS_Receipt), NULL);

  err:
     CMS_ReceiptRequest_free(rr);
     return os;
 }
	/*
	* Copyright 2008-2021 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 "internal/cryptlib.h"
	#include <openssl/asn1t.h>
	#include <openssl/pem.h>
	#include <openssl/rand.h>
	#include <openssl/x509v3.h>
	#include <openssl/err.h>
	#include <openssl/cms.h>
	#include <openssl/ess.h>
	#include "crypto/ess.h"
	#include "crypto/x509.h"
	#include "cms_local.h"

	IMPLEMENT_ASN1_FUNCTIONS(CMS_ReceiptRequest)

	/* ESS services */

	int CMS_get1_ReceiptRequest(CMS_SignerInfo si, CMS_ReceiptRequest *prr)
	{
	ASN1_STRING *str;
	CMS_ReceiptRequest *rr;
	ASN1_OBJECT *obj = OBJ_nid2obj(NID_id_smime_aa_receiptRequest);

	if (prr != NULL)
	*prr = NULL;
	str = CMS_signed_get0_data_by_OBJ(si, obj, -3, V_ASN1_SEQUENCE);
	if (str == NULL)
	return 0;

	rr = ASN1_item_unpack(str, ASN1_ITEM_rptr(CMS_ReceiptRequest));
	if (rr == NULL)
	return -1;
	if (prr != NULL)
	*prr = rr;
	else
	CMS_ReceiptRequest_free(rr);
	return 1;
	}

	/*
	* Returns 0 if attribute is not found, 1 if found,
	* or -1 on attribute parsing failure.
	*/
	static int ossl_cms_signerinfo_get_signing_cert(const CMS_SignerInfo *si,
	ESS_SIGNING_CERT **psc)
	{
	ASN1_STRING *str;
	ESS_SIGNING_CERT *sc;
	ASN1_OBJECT *obj = OBJ_nid2obj(NID_id_smime_aa_signingCertificate);

	if (psc != NULL)
	*psc = NULL;
	str = CMS_signed_get0_data_by_OBJ(si, obj, -3, V_ASN1_SEQUENCE);
	if (str == NULL)
	return 0;

	sc = ASN1_item_unpack(str, ASN1_ITEM_rptr(ESS_SIGNING_CERT));
	if (sc == NULL)
	return -1;
	if (psc != NULL)
	*psc = sc;
	else
	ESS_SIGNING_CERT_free(sc);
	return 1;
	}

	/*
	* Returns 0 if attribute is not found, 1 if found,
	* or -1 on attribute parsing failure.
	*/
	static int ossl_cms_signerinfo_get_signing_cert_v2(const CMS_SignerInfo *si,
	ESS_SIGNING_CERT_V2 **psc)
	{
	ASN1_STRING *str;
	ESS_SIGNING_CERT_V2 *sc;
	ASN1_OBJECT *obj = OBJ_nid2obj(NID_id_smime_aa_signingCertificateV2);

	if (psc != NULL)
	*psc = NULL;
	str = CMS_signed_get0_data_by_OBJ(si, obj, -3, V_ASN1_SEQUENCE);
	if (str == NULL)
	return 0;

	sc = ASN1_item_unpack(str, ASN1_ITEM_rptr(ESS_SIGNING_CERT_V2));
	if (sc == NULL)
	return -1;
	if (psc != NULL)
	*psc = sc;
	else
	ESS_SIGNING_CERT_V2_free(sc);
	return 1;
	}

	int ossl_cms_check_signing_certs(const CMS_SignerInfo *si,
	const STACK_OF(X509) *chain)
	{
	ESS_SIGNING_CERT *ss = NULL;
	ESS_SIGNING_CERT_V2 *ssv2 = NULL;
	int ret = ossl_cms_signerinfo_get_signing_cert(si, &ss) >= 0
	&& ossl_cms_signerinfo_get_signing_cert_v2(si, &ssv2) >= 0
	&& OSSL_ESS_check_signing_certs(ss, ssv2, chain, 1) > 0;

	ESS_SIGNING_CERT_free(ss);
	ESS_SIGNING_CERT_V2_free(ssv2);
	return ret;
	}

	CMS_ReceiptRequest *CMS_ReceiptRequest_create0_ex(
	unsigned char *id, int idlen, int allorfirst,
	STACK_OF(GENERAL_NAMES) receiptList, STACK_OF(GENERAL_NAMES) receiptsTo,
	OSSL_LIB_CTX *libctx)
	{
	CMS_ReceiptRequest *rr;

	rr = CMS_ReceiptRequest_new();
	if (rr == NULL)
	goto merr;
	if (id)
	ASN1_STRING_set0(rr->signedContentIdentifier, id, idlen);
	else {
	if (!ASN1_STRING_set(rr->signedContentIdentifier, NULL, 32))
	goto merr;
	if (RAND_bytes_ex(libctx, rr->signedContentIdentifier->data, 32,
	0) <= 0)
	goto err;
	}

	sk_GENERAL_NAMES_pop_free(rr->receiptsTo, GENERAL_NAMES_free);
	rr->receiptsTo = receiptsTo;

	if (receiptList != NULL) {
	rr->receiptsFrom->type = 1;
	rr->receiptsFrom->d.receiptList = receiptList;
	} else {
	rr->receiptsFrom->type = 0;
	rr->receiptsFrom->d.allOrFirstTier = allorfirst;
	}

	return rr;

	merr:
	ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);

	err:
	CMS_ReceiptRequest_free(rr);
	return NULL;

	}

	CMS_ReceiptRequest *CMS_ReceiptRequest_create0(
	unsigned char *id, int idlen, int allorfirst,
	STACK_OF(GENERAL_NAMES) receiptList, STACK_OF(GENERAL_NAMES) receiptsTo)
	{
	return CMS_ReceiptRequest_create0_ex(id, idlen, allorfirst, receiptList,
	receiptsTo, NULL);
	}

	int CMS_add1_ReceiptRequest(CMS_SignerInfo si, CMS_ReceiptRequest rr)
	{
	unsigned char *rrder = NULL;
	int rrderlen, r = 0;

	rrderlen = i2d_CMS_ReceiptRequest(rr, &rrder);
	if (rrderlen < 0)
	goto merr;

	if (!CMS_signed_add1_attr_by_NID(si, NID_id_smime_aa_receiptRequest,
	V_ASN1_SEQUENCE, rrder, rrderlen))
	goto merr;

	r = 1;

	merr:
	if (!r)
	ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);

	OPENSSL_free(rrder);

	return r;

	}

	void CMS_ReceiptRequest_get0_values(CMS_ReceiptRequest *rr,
	ASN1_STRING **pcid,
	int *pallorfirst,
	STACK_OF(GENERAL_NAMES) **plist,
	STACK_OF(GENERAL_NAMES) **prto)
	{
	if (pcid != NULL)
	*pcid = rr->signedContentIdentifier;
	if (rr->receiptsFrom->type == 0) {
	if (pallorfirst != NULL)
	*pallorfirst = (int)rr->receiptsFrom->d.allOrFirstTier;
	if (plist != NULL)
	*plist = NULL;
	} else {
	if (pallorfirst != NULL)
	*pallorfirst = -1;
	if (plist != NULL)
	*plist = rr->receiptsFrom->d.receiptList;
	}
	if (prto != NULL)
	*prto = rr->receiptsTo;
	}

	/* Digest a SignerInfo structure for msgSigDigest attribute processing */

	static int cms_msgSigDigest(CMS_SignerInfo *si,
	unsigned char dig, unsigned int diglen)
	{
	const EVP_MD *md = EVP_get_digestbyobj(si->digestAlgorithm->algorithm);

	if (md == NULL)
	return 0;
	if (!ossl_asn1_item_digest_ex(ASN1_ITEM_rptr(CMS_Attributes_Verify), md,
	si->signedAttrs, dig, diglen,
	ossl_cms_ctx_get0_libctx(si->cms_ctx),
	ossl_cms_ctx_get0_propq(si->cms_ctx)))
	return 0;
	return 1;
	}

	/* Add a msgSigDigest attribute to a SignerInfo */

	int ossl_cms_msgSigDigest_add1(CMS_SignerInfo dest, CMS_SignerInfo src)
	{
	unsigned char dig[EVP_MAX_MD_SIZE];
	unsigned int diglen;

	if (!cms_msgSigDigest(src, dig, &diglen)) {
	ERR_raise(ERR_LIB_CMS, CMS_R_MSGSIGDIGEST_ERROR);
	return 0;
	}
	if (!CMS_signed_add1_attr_by_NID(dest, NID_id_smime_aa_msgSigDigest,
	V_ASN1_OCTET_STRING, dig, diglen)) {
	ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
	return 0;
	}
	return 1;
	}

	/* Verify signed receipt after it has already passed normal CMS verify */

	int ossl_cms_Receipt_verify(CMS_ContentInfo cms, CMS_ContentInfo req_cms)
	{
	int r = 0, i;
	CMS_ReceiptRequest *rr = NULL;
	CMS_Receipt *rct = NULL;
	STACK_OF(CMS_SignerInfo) sis, osis;
	CMS_SignerInfo si, osi = NULL;
	ASN1_OCTET_STRING msig, *pcont;
	ASN1_OBJECT *octype;
	unsigned char dig[EVP_MAX_MD_SIZE];
	unsigned int diglen;

	/* Get SignerInfos, also checks SignedData content type */
	osis = CMS_get0_SignerInfos(req_cms);
	sis = CMS_get0_SignerInfos(cms);
	if (!osis \|\| !sis)
	goto err;

	if (sk_CMS_SignerInfo_num(sis) != 1) {
	ERR_raise(ERR_LIB_CMS, CMS_R_NEED_ONE_SIGNER);
	goto err;
	}

	/* Check receipt content type */
	if (OBJ_obj2nid(CMS_get0_eContentType(cms)) != NID_id_smime_ct_receipt) {
	ERR_raise(ERR_LIB_CMS, CMS_R_NOT_A_SIGNED_RECEIPT);
	goto err;
	}

	/* Extract and decode receipt content */
	pcont = CMS_get0_content(cms);
	if (pcont == NULL \|\| *pcont == NULL) {
	ERR_raise(ERR_LIB_CMS, CMS_R_NO_CONTENT);
	goto err;
	}

	rct = ASN1_item_unpack(*pcont, ASN1_ITEM_rptr(CMS_Receipt));

	if (!rct) {
	ERR_raise(ERR_LIB_CMS, CMS_R_RECEIPT_DECODE_ERROR);
	goto err;
	}

	/* Locate original request */

	for (i = 0; i < sk_CMS_SignerInfo_num(osis); i++) {
	osi = sk_CMS_SignerInfo_value(osis, i);
	if (!ASN1_STRING_cmp(osi->signature, rct->originatorSignatureValue))
	break;
	}

	if (i == sk_CMS_SignerInfo_num(osis)) {
	ERR_raise(ERR_LIB_CMS, CMS_R_NO_MATCHING_SIGNATURE);
	goto err;
	}

	si = sk_CMS_SignerInfo_value(sis, 0);

	/* Get msgSigDigest value and compare */

	msig = CMS_signed_get0_data_by_OBJ(si,
	OBJ_nid2obj
	(NID_id_smime_aa_msgSigDigest), -3,
	V_ASN1_OCTET_STRING);

	if (!msig) {
	ERR_raise(ERR_LIB_CMS, CMS_R_NO_MSGSIGDIGEST);
	goto err;
	}

	if (!cms_msgSigDigest(osi, dig, &diglen)) {
	ERR_raise(ERR_LIB_CMS, CMS_R_MSGSIGDIGEST_ERROR);
	goto err;
	}

	if (diglen != (unsigned int)msig->length) {
	ERR_raise(ERR_LIB_CMS, CMS_R_MSGSIGDIGEST_WRONG_LENGTH);
	goto err;
	}

	if (memcmp(dig, msig->data, diglen)) {
	ERR_raise(ERR_LIB_CMS, CMS_R_MSGSIGDIGEST_VERIFICATION_FAILURE);
	goto err;
	}

	/* Compare content types */

	octype = CMS_signed_get0_data_by_OBJ(osi,
	OBJ_nid2obj(NID_pkcs9_contentType),
	-3, V_ASN1_OBJECT);
	if (!octype) {
	ERR_raise(ERR_LIB_CMS, CMS_R_NO_CONTENT_TYPE);
	goto err;
	}

	/* Compare details in receipt request */

	if (OBJ_cmp(octype, rct->contentType)) {
	ERR_raise(ERR_LIB_CMS, CMS_R_CONTENT_TYPE_MISMATCH);
	goto err;
	}

	/* Get original receipt request details */

	if (CMS_get1_ReceiptRequest(osi, &rr) <= 0) {
	ERR_raise(ERR_LIB_CMS, CMS_R_NO_RECEIPT_REQUEST);
	goto err;
	}

	if (ASN1_STRING_cmp(rr->signedContentIdentifier,
	rct->signedContentIdentifier)) {
	ERR_raise(ERR_LIB_CMS, CMS_R_CONTENTIDENTIFIER_MISMATCH);
	goto err;
	}

	r = 1;

	err:
	CMS_ReceiptRequest_free(rr);
	M_ASN1_free_of(rct, CMS_Receipt);
	return r;

	}

	/*
	* Encode a Receipt into an OCTET STRING read for including into content of a
	* SignedData ContentInfo.
	*/

	ASN1_OCTET_STRING ossl_cms_encode_Receipt(CMS_SignerInfo si)
	{
	CMS_Receipt rct;
	CMS_ReceiptRequest *rr = NULL;
	ASN1_OBJECT *ctype;
	ASN1_OCTET_STRING *os = NULL;

	/* Get original receipt request */

	/* Get original receipt request details */

	if (CMS_get1_ReceiptRequest(si, &rr) <= 0) {
	ERR_raise(ERR_LIB_CMS, CMS_R_NO_RECEIPT_REQUEST);
	goto err;
	}

	/* Get original content type */

	ctype = CMS_signed_get0_data_by_OBJ(si,
	OBJ_nid2obj(NID_pkcs9_contentType),
	-3, V_ASN1_OBJECT);
	if (!ctype) {
	ERR_raise(ERR_LIB_CMS, CMS_R_NO_CONTENT_TYPE);
	goto err;
	}

	rct.version = 1;
	rct.contentType = ctype;
	rct.signedContentIdentifier = rr->signedContentIdentifier;
	rct.originatorSignatureValue = si->signature;

	os = ASN1_item_pack(&rct, ASN1_ITEM_rptr(CMS_Receipt), NULL);

	err:
	CMS_ReceiptRequest_free(rr);
	return os;
	}