path: root/lib/libcrypto/cms/cms_asn1.c

/* $OpenBSD: cms_asn1.c,v 1.14 2019/08/10 18:15:52 jsing Exp $ */
/*
 * 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 <openssl/asn1t.h>
#include <openssl/pem.h>
#include <openssl/x509v3.h>
#include <openssl/cms.h>
#include "cms_lcl.h"


ASN1_SEQUENCE(CMS_IssuerAndSerialNumber) = {
	ASN1_SIMPLE(CMS_IssuerAndSerialNumber, issuer, X509_NAME),
	ASN1_SIMPLE(CMS_IssuerAndSerialNumber, serialNumber, ASN1_INTEGER)
} ASN1_SEQUENCE_END(CMS_IssuerAndSerialNumber)

ASN1_SEQUENCE(CMS_OtherCertificateFormat) = {
	ASN1_SIMPLE(CMS_OtherCertificateFormat, otherCertFormat, ASN1_OBJECT),
	ASN1_OPT(CMS_OtherCertificateFormat, otherCert, ASN1_ANY)
} static_ASN1_SEQUENCE_END(CMS_OtherCertificateFormat)

ASN1_CHOICE(CMS_CertificateChoices) = {
	ASN1_SIMPLE(CMS_CertificateChoices, d.certificate, X509),
	ASN1_IMP(CMS_CertificateChoices, d.extendedCertificate, ASN1_SEQUENCE, 0),
	ASN1_IMP(CMS_CertificateChoices, d.v1AttrCert, ASN1_SEQUENCE, 1),
	ASN1_IMP(CMS_CertificateChoices, d.v2AttrCert, ASN1_SEQUENCE, 2),
	ASN1_IMP(CMS_CertificateChoices, d.other, CMS_OtherCertificateFormat, 3)
} ASN1_CHOICE_END(CMS_CertificateChoices)

ASN1_CHOICE(CMS_SignerIdentifier) = {
	ASN1_SIMPLE(CMS_SignerIdentifier, d.issuerAndSerialNumber, CMS_IssuerAndSerialNumber),
	ASN1_IMP(CMS_SignerIdentifier, d.subjectKeyIdentifier, ASN1_OCTET_STRING, 0)
} static_ASN1_CHOICE_END(CMS_SignerIdentifier)

ASN1_NDEF_SEQUENCE(CMS_EncapsulatedContentInfo) = {
	ASN1_SIMPLE(CMS_EncapsulatedContentInfo, eContentType, ASN1_OBJECT),
	ASN1_NDEF_EXP_OPT(CMS_EncapsulatedContentInfo, eContent, ASN1_OCTET_STRING_NDEF, 0)
} static_ASN1_NDEF_SEQUENCE_END(CMS_EncapsulatedContentInfo)

/* Minor tweak to operation: free up signer key, cert */
static int
cms_si_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it, void *exarg)
{
	if (operation == ASN1_OP_FREE_POST) {
		CMS_SignerInfo *si = (CMS_SignerInfo *)*pval;
		EVP_PKEY_free(si->pkey);
		X509_free(si->signer);
		EVP_MD_CTX_free(si->mctx);
	}
	return 1;
}

ASN1_SEQUENCE_cb(CMS_SignerInfo, cms_si_cb) = {
	ASN1_EMBED(CMS_SignerInfo, version, INT32),
	ASN1_SIMPLE(CMS_SignerInfo, sid, CMS_SignerIdentifier),
	ASN1_SIMPLE(CMS_SignerInfo, digestAlgorithm, X509_ALGOR),
	ASN1_IMP_SET_OF_OPT(CMS_SignerInfo, signedAttrs, X509_ATTRIBUTE, 0),
	ASN1_SIMPLE(CMS_SignerInfo, signatureAlgorithm, X509_ALGOR),
	ASN1_SIMPLE(CMS_SignerInfo, signature, ASN1_OCTET_STRING),
	ASN1_IMP_SET_OF_OPT(CMS_SignerInfo, unsignedAttrs, X509_ATTRIBUTE, 1)
} ASN1_SEQUENCE_END_cb(CMS_SignerInfo, CMS_SignerInfo)

ASN1_SEQUENCE(CMS_OtherRevocationInfoFormat) = {
	ASN1_SIMPLE(CMS_OtherRevocationInfoFormat, otherRevInfoFormat, ASN1_OBJECT),
	ASN1_OPT(CMS_OtherRevocationInfoFormat, otherRevInfo, ASN1_ANY)
} static_ASN1_SEQUENCE_END(CMS_OtherRevocationInfoFormat)

ASN1_CHOICE(CMS_RevocationInfoChoice) = {
	ASN1_SIMPLE(CMS_RevocationInfoChoice, d.crl, X509_CRL),
	ASN1_IMP(CMS_RevocationInfoChoice, d.other, CMS_OtherRevocationInfoFormat, 1)
} ASN1_CHOICE_END(CMS_RevocationInfoChoice)

ASN1_NDEF_SEQUENCE(CMS_SignedData) = {
	ASN1_EMBED(CMS_SignedData, version, INT32),
	ASN1_SET_OF(CMS_SignedData, digestAlgorithms, X509_ALGOR),
	ASN1_SIMPLE(CMS_SignedData, encapContentInfo, CMS_EncapsulatedContentInfo),
	ASN1_IMP_SET_OF_OPT(CMS_SignedData, certificates, CMS_CertificateChoices, 0),
	ASN1_IMP_SET_OF_OPT(CMS_SignedData, crls, CMS_RevocationInfoChoice, 1),
	ASN1_SET_OF(CMS_SignedData, signerInfos, CMS_SignerInfo)
} ASN1_NDEF_SEQUENCE_END(CMS_SignedData)

ASN1_SEQUENCE(CMS_OriginatorInfo) = {
	ASN1_IMP_SET_OF_OPT(CMS_OriginatorInfo, certificates, CMS_CertificateChoices, 0),
	ASN1_IMP_SET_OF_OPT(CMS_OriginatorInfo, crls, CMS_RevocationInfoChoice, 1)
} static_ASN1_SEQUENCE_END(CMS_OriginatorInfo)

ASN1_NDEF_SEQUENCE(CMS_EncryptedContentInfo) = {
	ASN1_SIMPLE(CMS_EncryptedContentInfo, contentType, ASN1_OBJECT),
	ASN1_SIMPLE(CMS_EncryptedContentInfo, contentEncryptionAlgorithm, X509_ALGOR),
	ASN1_IMP_OPT(CMS_EncryptedContentInfo, encryptedContent, ASN1_OCTET_STRING_NDEF, 0)
} static_ASN1_NDEF_SEQUENCE_END(CMS_EncryptedContentInfo)

ASN1_SEQUENCE(CMS_KeyTransRecipientInfo) = {
	ASN1_EMBED(CMS_KeyTransRecipientInfo, version, INT32),
	ASN1_SIMPLE(CMS_KeyTransRecipientInfo, rid, CMS_SignerIdentifier),
	ASN1_SIMPLE(CMS_KeyTransRecipientInfo, keyEncryptionAlgorithm, X509_ALGOR),
	ASN1_SIMPLE(CMS_KeyTransRecipientInfo, encryptedKey, ASN1_OCTET_STRING)
} ASN1_SEQUENCE_END(CMS_KeyTransRecipientInfo)

ASN1_SEQUENCE(CMS_OtherKeyAttribute) = {
	ASN1_SIMPLE(CMS_OtherKeyAttribute, keyAttrId, ASN1_OBJECT),
	ASN1_OPT(CMS_OtherKeyAttribute, keyAttr, ASN1_ANY)
} ASN1_SEQUENCE_END(CMS_OtherKeyAttribute)

ASN1_SEQUENCE(CMS_RecipientKeyIdentifier) = {
	ASN1_SIMPLE(CMS_RecipientKeyIdentifier, subjectKeyIdentifier, ASN1_OCTET_STRING),
	ASN1_OPT(CMS_RecipientKeyIdentifier, date, ASN1_GENERALIZEDTIME),
	ASN1_OPT(CMS_RecipientKeyIdentifier, other, CMS_OtherKeyAttribute)
} ASN1_SEQUENCE_END(CMS_RecipientKeyIdentifier)

ASN1_CHOICE(CMS_KeyAgreeRecipientIdentifier) = {
	ASN1_SIMPLE(CMS_KeyAgreeRecipientIdentifier, d.issuerAndSerialNumber, CMS_IssuerAndSerialNumber),
	ASN1_IMP(CMS_KeyAgreeRecipientIdentifier, d.rKeyId, CMS_RecipientKeyIdentifier, 0)
} static_ASN1_CHOICE_END(CMS_KeyAgreeRecipientIdentifier)

static int
cms_rek_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it, void *exarg)
{
	CMS_RecipientEncryptedKey *rek = (CMS_RecipientEncryptedKey *)*pval;
	if (operation == ASN1_OP_FREE_POST) {
		EVP_PKEY_free(rek->pkey);
	}
	return 1;
}

ASN1_SEQUENCE_cb(CMS_RecipientEncryptedKey, cms_rek_cb) = {
	ASN1_SIMPLE(CMS_RecipientEncryptedKey, rid, CMS_KeyAgreeRecipientIdentifier),
	ASN1_SIMPLE(CMS_RecipientEncryptedKey, encryptedKey, ASN1_OCTET_STRING)
} ASN1_SEQUENCE_END_cb(CMS_RecipientEncryptedKey, CMS_RecipientEncryptedKey)

ASN1_SEQUENCE(CMS_OriginatorPublicKey) = {
	ASN1_SIMPLE(CMS_OriginatorPublicKey, algorithm, X509_ALGOR),
	ASN1_SIMPLE(CMS_OriginatorPublicKey, publicKey, ASN1_BIT_STRING)
} ASN1_SEQUENCE_END(CMS_OriginatorPublicKey)

ASN1_CHOICE(CMS_OriginatorIdentifierOrKey) = {
	ASN1_SIMPLE(CMS_OriginatorIdentifierOrKey, d.issuerAndSerialNumber, CMS_IssuerAndSerialNumber),
	ASN1_IMP(CMS_OriginatorIdentifierOrKey, d.subjectKeyIdentifier, ASN1_OCTET_STRING, 0),
	ASN1_IMP(CMS_OriginatorIdentifierOrKey, d.originatorKey, CMS_OriginatorPublicKey, 1)
} static_ASN1_CHOICE_END(CMS_OriginatorIdentifierOrKey)

static int
cms_kari_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it, void *exarg)
{
	CMS_KeyAgreeRecipientInfo *kari = (CMS_KeyAgreeRecipientInfo *)*pval;
	if (operation == ASN1_OP_NEW_POST) {
		kari->ctx = EVP_CIPHER_CTX_new();
		if (kari->ctx == NULL)
			return 0;
		EVP_CIPHER_CTX_set_flags(kari->ctx, EVP_CIPHER_CTX_FLAG_WRAP_ALLOW);
		kari->pctx = NULL;
	} else if (operation == ASN1_OP_FREE_POST) {
		EVP_PKEY_CTX_free(kari->pctx);
		EVP_CIPHER_CTX_free(kari->ctx);
	}
	return 1;
}

ASN1_SEQUENCE_cb(CMS_KeyAgreeRecipientInfo, cms_kari_cb) = {
	ASN1_EMBED(CMS_KeyAgreeRecipientInfo, version, INT32),
	ASN1_EXP(CMS_KeyAgreeRecipientInfo, originator, CMS_OriginatorIdentifierOrKey, 0),
	ASN1_EXP_OPT(CMS_KeyAgreeRecipientInfo, ukm, ASN1_OCTET_STRING, 1),
	ASN1_SIMPLE(CMS_KeyAgreeRecipientInfo, keyEncryptionAlgorithm, X509_ALGOR),
	ASN1_SEQUENCE_OF(CMS_KeyAgreeRecipientInfo, recipientEncryptedKeys, CMS_RecipientEncryptedKey)
} ASN1_SEQUENCE_END_cb(CMS_KeyAgreeRecipientInfo, CMS_KeyAgreeRecipientInfo)

ASN1_SEQUENCE(CMS_KEKIdentifier) = {
	ASN1_SIMPLE(CMS_KEKIdentifier, keyIdentifier, ASN1_OCTET_STRING),
	ASN1_OPT(CMS_KEKIdentifier, date, ASN1_GENERALIZEDTIME),
	ASN1_OPT(CMS_KEKIdentifier, other, CMS_OtherKeyAttribute)
} static_ASN1_SEQUENCE_END(CMS_KEKIdentifier)

ASN1_SEQUENCE(CMS_KEKRecipientInfo) = {
	ASN1_EMBED(CMS_KEKRecipientInfo, version, INT32),
	ASN1_SIMPLE(CMS_KEKRecipientInfo, kekid, CMS_KEKIdentifier),
	ASN1_SIMPLE(CMS_KEKRecipientInfo, keyEncryptionAlgorithm, X509_ALGOR),
	ASN1_SIMPLE(CMS_KEKRecipientInfo, encryptedKey, ASN1_OCTET_STRING)
} ASN1_SEQUENCE_END(CMS_KEKRecipientInfo)

ASN1_SEQUENCE(CMS_PasswordRecipientInfo) = {
	ASN1_EMBED(CMS_PasswordRecipientInfo, version, INT32),
	ASN1_IMP_OPT(CMS_PasswordRecipientInfo, keyDerivationAlgorithm, X509_ALGOR, 0),
	ASN1_SIMPLE(CMS_PasswordRecipientInfo, keyEncryptionAlgorithm, X509_ALGOR),
	ASN1_SIMPLE(CMS_PasswordRecipientInfo, encryptedKey, ASN1_OCTET_STRING)
} ASN1_SEQUENCE_END(CMS_PasswordRecipientInfo)

ASN1_SEQUENCE(CMS_OtherRecipientInfo) = {
	ASN1_SIMPLE(CMS_OtherRecipientInfo, oriType, ASN1_OBJECT),
	ASN1_OPT(CMS_OtherRecipientInfo, oriValue, ASN1_ANY)
} static_ASN1_SEQUENCE_END(CMS_OtherRecipientInfo)

/* Free up RecipientInfo additional data */
static int
cms_ri_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it, void *exarg)
{
	if (operation == ASN1_OP_FREE_PRE) {
		CMS_RecipientInfo *ri = (CMS_RecipientInfo *)*pval;
		if (ri->type == CMS_RECIPINFO_TRANS) {
			CMS_KeyTransRecipientInfo *ktri = ri->d.ktri;
			EVP_PKEY_free(ktri->pkey);
			X509_free(ktri->recip);
			EVP_PKEY_CTX_free(ktri->pctx);
		} else if (ri->type == CMS_RECIPINFO_KEK) {
			CMS_KEKRecipientInfo *kekri = ri->d.kekri;
			OPENSSL_clear_free(kekri->key, kekri->keylen);
		} else if (ri->type == CMS_RECIPINFO_PASS) {
			CMS_PasswordRecipientInfo *pwri = ri->d.pwri;
			OPENSSL_clear_free(pwri->pass, pwri->passlen);
		}
	}
	return 1;
}

ASN1_CHOICE_cb(CMS_RecipientInfo, cms_ri_cb) = {
	ASN1_SIMPLE(CMS_RecipientInfo, d.ktri, CMS_KeyTransRecipientInfo),
	ASN1_IMP(CMS_RecipientInfo, d.kari, CMS_KeyAgreeRecipientInfo, 1),
	ASN1_IMP(CMS_RecipientInfo, d.kekri, CMS_KEKRecipientInfo, 2),
	ASN1_IMP(CMS_RecipientInfo, d.pwri, CMS_PasswordRecipientInfo, 3),
	ASN1_IMP(CMS_RecipientInfo, d.ori, CMS_OtherRecipientInfo, 4)
} ASN1_CHOICE_END_cb(CMS_RecipientInfo, CMS_RecipientInfo, type)

ASN1_NDEF_SEQUENCE(CMS_EnvelopedData) = {
	ASN1_EMBED(CMS_EnvelopedData, version, INT32),
	ASN1_IMP_OPT(CMS_EnvelopedData, originatorInfo, CMS_OriginatorInfo, 0),
	ASN1_SET_OF(CMS_EnvelopedData, recipientInfos, CMS_RecipientInfo),
	ASN1_SIMPLE(CMS_EnvelopedData, encryptedContentInfo, CMS_EncryptedContentInfo),
	ASN1_IMP_SET_OF_OPT(CMS_EnvelopedData, unprotectedAttrs, X509_ATTRIBUTE, 1)
} ASN1_NDEF_SEQUENCE_END(CMS_EnvelopedData)

ASN1_NDEF_SEQUENCE(CMS_DigestedData) = {
	ASN1_EMBED(CMS_DigestedData, version, INT32),
	ASN1_SIMPLE(CMS_DigestedData, digestAlgorithm, X509_ALGOR),
	ASN1_SIMPLE(CMS_DigestedData, encapContentInfo, CMS_EncapsulatedContentInfo),
	ASN1_SIMPLE(CMS_DigestedData, digest, ASN1_OCTET_STRING)
} ASN1_NDEF_SEQUENCE_END(CMS_DigestedData)

ASN1_NDEF_SEQUENCE(CMS_EncryptedData) = {
	ASN1_EMBED(CMS_EncryptedData, version, INT32),
	ASN1_SIMPLE(CMS_EncryptedData, encryptedContentInfo, CMS_EncryptedContentInfo),
	ASN1_IMP_SET_OF_OPT(CMS_EncryptedData, unprotectedAttrs, X509_ATTRIBUTE, 1)
} ASN1_NDEF_SEQUENCE_END(CMS_EncryptedData)

ASN1_NDEF_SEQUENCE(CMS_AuthenticatedData) = {
	ASN1_EMBED(CMS_AuthenticatedData, version, INT32),
	ASN1_IMP_OPT(CMS_AuthenticatedData, originatorInfo, CMS_OriginatorInfo, 0),
	ASN1_SET_OF(CMS_AuthenticatedData, recipientInfos, CMS_RecipientInfo),
	ASN1_SIMPLE(CMS_AuthenticatedData, macAlgorithm, X509_ALGOR),
	ASN1_IMP(CMS_AuthenticatedData, digestAlgorithm, X509_ALGOR, 1),
	ASN1_SIMPLE(CMS_AuthenticatedData, encapContentInfo, CMS_EncapsulatedContentInfo),
	ASN1_IMP_SET_OF_OPT(CMS_AuthenticatedData, authAttrs, X509_ALGOR, 2),
	ASN1_SIMPLE(CMS_AuthenticatedData, mac, ASN1_OCTET_STRING),
	ASN1_IMP_SET_OF_OPT(CMS_AuthenticatedData, unauthAttrs, X509_ALGOR, 3)
} static_ASN1_NDEF_SEQUENCE_END(CMS_AuthenticatedData)

ASN1_NDEF_SEQUENCE(CMS_CompressedData) = {
	ASN1_EMBED(CMS_CompressedData, version, INT32),
	ASN1_SIMPLE(CMS_CompressedData, compressionAlgorithm, X509_ALGOR),
	ASN1_SIMPLE(CMS_CompressedData, encapContentInfo, CMS_EncapsulatedContentInfo),
} ASN1_NDEF_SEQUENCE_END(CMS_CompressedData)

/* This is the ANY DEFINED BY table for the top level ContentInfo structure */

ASN1_ADB_TEMPLATE(cms_default) = ASN1_EXP(CMS_ContentInfo, d.other, ASN1_ANY, 0);

ASN1_ADB(CMS_ContentInfo) = {
	ADB_ENTRY(NID_pkcs7_data, ASN1_NDEF_EXP(CMS_ContentInfo, d.data, ASN1_OCTET_STRING_NDEF, 0)),
	ADB_ENTRY(NID_pkcs7_signed, ASN1_NDEF_EXP(CMS_ContentInfo, d.signedData, CMS_SignedData, 0)),
	ADB_ENTRY(NID_pkcs7_enveloped, ASN1_NDEF_EXP(CMS_ContentInfo, d.envelopedData, CMS_EnvelopedData, 0)),
	ADB_ENTRY(NID_pkcs7_digest, ASN1_NDEF_EXP(CMS_ContentInfo, d.digestedData, CMS_DigestedData, 0)),
	ADB_ENTRY(NID_pkcs7_encrypted, ASN1_NDEF_EXP(CMS_ContentInfo, d.encryptedData, CMS_EncryptedData, 0)),
	ADB_ENTRY(NID_id_smime_ct_authData, ASN1_NDEF_EXP(CMS_ContentInfo, d.authenticatedData, CMS_AuthenticatedData, 0)),
	ADB_ENTRY(NID_id_smime_ct_compressedData, ASN1_NDEF_EXP(CMS_ContentInfo, d.compressedData, CMS_CompressedData, 0)),
} ASN1_ADB_END(CMS_ContentInfo, 0, contentType, 0, &cms_default_tt, NULL);

/* CMS streaming support */
static int
cms_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it, void *exarg)
{
	ASN1_STREAM_ARG *sarg = exarg;
	CMS_ContentInfo *cms = NULL;
	if (pval)
		cms = (CMS_ContentInfo *)*pval;
	else
		return 1;
	switch (operation) {

	case ASN1_OP_STREAM_PRE:
		if (CMS_stream(&sarg->boundary, cms) <= 0)
			return 0;
		/* fall thru */
	case ASN1_OP_DETACHED_PRE:
		sarg->ndef_bio = CMS_dataInit(cms, sarg->out);
		if (!sarg->ndef_bio)
			return 0;
		break;

	case ASN1_OP_STREAM_POST:
	case ASN1_OP_DETACHED_POST:
		if (CMS_dataFinal(cms, sarg->ndef_bio) <= 0)
			return 0;
		break;

	}
	return 1;
}

ASN1_NDEF_SEQUENCE_cb(CMS_ContentInfo, cms_cb) = {
	ASN1_SIMPLE(CMS_ContentInfo, contentType, ASN1_OBJECT),
	ASN1_ADB_OBJECT(CMS_ContentInfo)
} ASN1_NDEF_SEQUENCE_END_cb(CMS_ContentInfo, CMS_ContentInfo)

/* Specials for signed attributes */

/*
 * When signing attributes we want to reorder them to match the sorted
 * encoding.
 */

ASN1_ITEM_TEMPLATE(CMS_Attributes_Sign) =
	ASN1_EX_TEMPLATE_TYPE(ASN1_TFLG_SET_ORDER, 0, CMS_ATTRIBUTES, X509_ATTRIBUTE)
ASN1_ITEM_TEMPLATE_END(CMS_Attributes_Sign)

/*
 * When verifying attributes we need to use the received order. So we use
 * SEQUENCE OF and tag it to SET OF
 */

ASN1_ITEM_TEMPLATE(CMS_Attributes_Verify) =
	ASN1_EX_TEMPLATE_TYPE(ASN1_TFLG_SEQUENCE_OF | ASN1_TFLG_IMPTAG | ASN1_TFLG_UNIVERSAL, V_ASN1_SET, CMS_ATTRIBUTES, X509_ATTRIBUTE)
ASN1_ITEM_TEMPLATE_END(CMS_Attributes_Verify)



ASN1_CHOICE(CMS_ReceiptsFrom) = {
	ASN1_IMP_EMBED(CMS_ReceiptsFrom, d.allOrFirstTier, INT32, 0),
	ASN1_IMP_SEQUENCE_OF(CMS_ReceiptsFrom, d.receiptList, GENERAL_NAMES, 1)
} static_ASN1_CHOICE_END(CMS_ReceiptsFrom)

ASN1_SEQUENCE(CMS_ReceiptRequest) = {
	ASN1_SIMPLE(CMS_ReceiptRequest, signedContentIdentifier, ASN1_OCTET_STRING),
	ASN1_SIMPLE(CMS_ReceiptRequest, receiptsFrom, CMS_ReceiptsFrom),
	ASN1_SEQUENCE_OF(CMS_ReceiptRequest, receiptsTo, GENERAL_NAMES)
} ASN1_SEQUENCE_END(CMS_ReceiptRequest)

ASN1_SEQUENCE(CMS_Receipt) = {
	ASN1_EMBED(CMS_Receipt, version, INT32),
	ASN1_SIMPLE(CMS_Receipt, contentType, ASN1_OBJECT),
	ASN1_SIMPLE(CMS_Receipt, signedContentIdentifier, ASN1_OCTET_STRING),
	ASN1_SIMPLE(CMS_Receipt, originatorSignatureValue, ASN1_OCTET_STRING)
} ASN1_SEQUENCE_END(CMS_Receipt)

/*
 * Utilities to encode the CMS_SharedInfo structure used during key
 * derivation.
 */

typedef struct {
	X509_ALGOR *keyInfo;
	ASN1_OCTET_STRING *entityUInfo;
	ASN1_OCTET_STRING *suppPubInfo;
} CMS_SharedInfo;

ASN1_SEQUENCE(CMS_SharedInfo) = {
	ASN1_SIMPLE(CMS_SharedInfo, keyInfo, X509_ALGOR),
	ASN1_EXP_OPT(CMS_SharedInfo, entityUInfo, ASN1_OCTET_STRING, 0),
	ASN1_EXP_OPT(CMS_SharedInfo, suppPubInfo, ASN1_OCTET_STRING, 2),
} static_ASN1_SEQUENCE_END(CMS_SharedInfo)

int
CMS_SharedInfo_encode(unsigned char **pder, X509_ALGOR *kekalg,
    ASN1_OCTET_STRING *ukm, int keylen)
{
	union {
		CMS_SharedInfo *pecsi;
		ASN1_VALUE *a;
	} intsi = {
		NULL
	};

	ASN1_OCTET_STRING oklen;
	unsigned char kl[4];
	CMS_SharedInfo ecsi;

	keylen <<= 3;
	kl[0] = (keylen >> 24) & 0xff;
	kl[1] = (keylen >> 16) & 0xff;
	kl[2] = (keylen >> 8) & 0xff;
	kl[3] = keylen & 0xff;
	oklen.length = 4;
	oklen.data = kl;
	oklen.type = V_ASN1_OCTET_STRING;
	oklen.flags = 0;
	ecsi.keyInfo = kekalg;
	ecsi.entityUInfo = ukm;
	ecsi.suppPubInfo = &oklen;
	intsi.pecsi = &ecsi;

	return ASN1_item_i2d(intsi.a, pder, ASN1_ITEM_rptr(CMS_SharedInfo));
}