pineapple/externals/libressl/crypto/cms/cms_env.c
2022-04-24 22:29:35 +02:00

979 lines
21 KiB
C
Executable file

/* $OpenBSD: cms_env.c,v 1.24 2021/09/08 14:33:02 tb 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 <string.h>
#include "cryptlib.h"
#include <openssl/asn1t.h>
#include <openssl/pem.h>
#include <openssl/x509v3.h>
#include <openssl/err.h>
#include <openssl/cms.h>
#include <openssl/aes.h>
#include "cms_lcl.h"
#include "asn1/asn1_locl.h"
#include "evp/evp_locl.h"
/* CMS EnvelopedData Utilities */
CMS_EnvelopedData *
cms_get0_enveloped(CMS_ContentInfo *cms)
{
if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_enveloped) {
CMSerror(CMS_R_CONTENT_TYPE_NOT_ENVELOPED_DATA);
return NULL;
}
return cms->d.envelopedData;
}
static CMS_EnvelopedData *
cms_enveloped_data_init(CMS_ContentInfo *cms)
{
if (cms->d.other == NULL) {
cms->d.envelopedData = (CMS_EnvelopedData *)ASN1_item_new(&CMS_EnvelopedData_it);
if (!cms->d.envelopedData) {
CMSerror(ERR_R_MALLOC_FAILURE);
return NULL;
}
cms->d.envelopedData->version = 0;
cms->d.envelopedData->encryptedContentInfo->contentType =
OBJ_nid2obj(NID_pkcs7_data);
ASN1_OBJECT_free(cms->contentType);
cms->contentType = OBJ_nid2obj(NID_pkcs7_enveloped);
return cms->d.envelopedData;
}
return cms_get0_enveloped(cms);
}
int
cms_env_asn1_ctrl(CMS_RecipientInfo *ri, int cmd)
{
EVP_PKEY *pkey;
int i;
if (ri->type == CMS_RECIPINFO_TRANS)
pkey = ri->d.ktri->pkey;
else if (ri->type == CMS_RECIPINFO_AGREE) {
EVP_PKEY_CTX *pctx = ri->d.kari->pctx;
if (!pctx)
return 0;
pkey = EVP_PKEY_CTX_get0_pkey(pctx);
if (!pkey)
return 0;
} else
return 0;
if (!pkey->ameth || !pkey->ameth->pkey_ctrl)
return 1;
i = pkey->ameth->pkey_ctrl(pkey, ASN1_PKEY_CTRL_CMS_ENVELOPE, cmd, ri);
if (i == -2) {
CMSerror(CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
return 0;
}
if (i <= 0) {
CMSerror(CMS_R_CTRL_FAILURE);
return 0;
}
return 1;
}
STACK_OF(CMS_RecipientInfo) *
CMS_get0_RecipientInfos(CMS_ContentInfo *cms)
{
CMS_EnvelopedData *env;
env = cms_get0_enveloped(cms);
if (!env)
return NULL;
return env->recipientInfos;
}
int
CMS_RecipientInfo_type(CMS_RecipientInfo *ri)
{
return ri->type;
}
EVP_PKEY_CTX *
CMS_RecipientInfo_get0_pkey_ctx(CMS_RecipientInfo *ri)
{
if (ri->type == CMS_RECIPINFO_TRANS)
return ri->d.ktri->pctx;
else if (ri->type == CMS_RECIPINFO_AGREE)
return ri->d.kari->pctx;
return NULL;
}
CMS_ContentInfo *
CMS_EnvelopedData_create(const EVP_CIPHER *cipher)
{
CMS_ContentInfo *cms;
CMS_EnvelopedData *env;
cms = CMS_ContentInfo_new();
if (cms == NULL)
goto merr;
env = cms_enveloped_data_init(cms);
if (env == NULL)
goto merr;
if (!cms_EncryptedContent_init(env->encryptedContentInfo, cipher,
NULL, 0))
goto merr;
return cms;
merr:
CMS_ContentInfo_free(cms);
CMSerror(ERR_R_MALLOC_FAILURE);
return NULL;
}
/* Key Transport Recipient Info (KTRI) routines */
/* Initialise a ktri based on passed certificate and key */
static int
cms_RecipientInfo_ktri_init(CMS_RecipientInfo *ri, X509 *recip, EVP_PKEY *pk,
unsigned int flags)
{
CMS_KeyTransRecipientInfo *ktri;
int idtype;
ri->d.ktri = (CMS_KeyTransRecipientInfo *)ASN1_item_new(&CMS_KeyTransRecipientInfo_it);
if (!ri->d.ktri)
return 0;
ri->type = CMS_RECIPINFO_TRANS;
ktri = ri->d.ktri;
if (flags & CMS_USE_KEYID) {
ktri->version = 2;
idtype = CMS_RECIPINFO_KEYIDENTIFIER;
} else {
ktri->version = 0;
idtype = CMS_RECIPINFO_ISSUER_SERIAL;
}
/*
* Not a typo: RecipientIdentifier and SignerIdentifier are the same
* structure.
*/
if (!cms_set1_SignerIdentifier(ktri->rid, recip, idtype))
return 0;
X509_up_ref(recip);
EVP_PKEY_up_ref(pk);
ktri->pkey = pk;
ktri->recip = recip;
if (flags & CMS_KEY_PARAM) {
ktri->pctx = EVP_PKEY_CTX_new(ktri->pkey, NULL);
if (ktri->pctx == NULL)
return 0;
if (EVP_PKEY_encrypt_init(ktri->pctx) <= 0)
return 0;
} else if (!cms_env_asn1_ctrl(ri, 0))
return 0;
return 1;
}
/*
* Add a recipient certificate using appropriate type of RecipientInfo
*/
CMS_RecipientInfo *
CMS_add1_recipient_cert(CMS_ContentInfo *cms, X509 *recip, unsigned int flags)
{
CMS_RecipientInfo *ri = NULL;
CMS_EnvelopedData *env;
EVP_PKEY *pk = NULL;
env = cms_get0_enveloped(cms);
if (!env)
goto err;
/* Initialize recipient info */
ri = (CMS_RecipientInfo *)ASN1_item_new(&CMS_RecipientInfo_it);
if (!ri)
goto merr;
pk = X509_get0_pubkey(recip);
if (!pk) {
CMSerror(CMS_R_ERROR_GETTING_PUBLIC_KEY);
goto err;
}
switch (cms_pkey_get_ri_type(pk)) {
case CMS_RECIPINFO_TRANS:
if (!cms_RecipientInfo_ktri_init(ri, recip, pk, flags))
goto err;
break;
case CMS_RECIPINFO_AGREE:
if (!cms_RecipientInfo_kari_init(ri, recip, pk, flags))
goto err;
break;
default:
CMSerror(CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
goto err;
}
if (!sk_CMS_RecipientInfo_push(env->recipientInfos, ri))
goto merr;
return ri;
merr:
CMSerror(ERR_R_MALLOC_FAILURE);
err:
ASN1_item_free((ASN1_VALUE *)ri, &CMS_RecipientInfo_it);
return NULL;
}
int
CMS_RecipientInfo_ktri_get0_algs(CMS_RecipientInfo *ri, EVP_PKEY **pk,
X509 **recip, X509_ALGOR **palg)
{
CMS_KeyTransRecipientInfo *ktri;
if (ri->type != CMS_RECIPINFO_TRANS) {
CMSerror(CMS_R_NOT_KEY_TRANSPORT);
return 0;
}
ktri = ri->d.ktri;
if (pk)
*pk = ktri->pkey;
if (recip)
*recip = ktri->recip;
if (palg)
*palg = ktri->keyEncryptionAlgorithm;
return 1;
}
int
CMS_RecipientInfo_ktri_get0_signer_id(CMS_RecipientInfo *ri,
ASN1_OCTET_STRING **keyid, X509_NAME **issuer, ASN1_INTEGER **sno)
{
CMS_KeyTransRecipientInfo *ktri;
if (ri->type != CMS_RECIPINFO_TRANS) {
CMSerror(CMS_R_NOT_KEY_TRANSPORT);
return 0;
}
ktri = ri->d.ktri;
return cms_SignerIdentifier_get0_signer_id(ktri->rid, keyid, issuer, sno);
}
int
CMS_RecipientInfo_ktri_cert_cmp(CMS_RecipientInfo *ri, X509 *cert)
{
if (ri->type != CMS_RECIPINFO_TRANS) {
CMSerror(CMS_R_NOT_KEY_TRANSPORT);
return -2;
}
return cms_SignerIdentifier_cert_cmp(ri->d.ktri->rid, cert);
}
int
CMS_RecipientInfo_set0_pkey(CMS_RecipientInfo *ri, EVP_PKEY *pkey)
{
if (ri->type != CMS_RECIPINFO_TRANS) {
CMSerror(CMS_R_NOT_KEY_TRANSPORT);
return 0;
}
EVP_PKEY_free(ri->d.ktri->pkey);
ri->d.ktri->pkey = pkey;
return 1;
}
/* Encrypt content key in key transport recipient info */
static int
cms_RecipientInfo_ktri_encrypt(CMS_ContentInfo *cms, CMS_RecipientInfo *ri)
{
CMS_KeyTransRecipientInfo *ktri;
CMS_EncryptedContentInfo *ec;
EVP_PKEY_CTX *pctx;
unsigned char *ek = NULL;
size_t eklen;
int ret = 0;
if (ri->type != CMS_RECIPINFO_TRANS) {
CMSerror(CMS_R_NOT_KEY_TRANSPORT);
return 0;
}
ktri = ri->d.ktri;
ec = cms->d.envelopedData->encryptedContentInfo;
pctx = ktri->pctx;
if (pctx) {
if (!cms_env_asn1_ctrl(ri, 0))
goto err;
} else {
pctx = EVP_PKEY_CTX_new(ktri->pkey, NULL);
if (pctx == NULL)
return 0;
if (EVP_PKEY_encrypt_init(pctx) <= 0)
goto err;
}
if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_ENCRYPT,
EVP_PKEY_CTRL_CMS_ENCRYPT, 0, ri) <= 0) {
CMSerror(CMS_R_CTRL_ERROR);
goto err;
}
if (EVP_PKEY_encrypt(pctx, NULL, &eklen, ec->key, ec->keylen) <= 0)
goto err;
ek = malloc(eklen);
if (ek == NULL) {
CMSerror(ERR_R_MALLOC_FAILURE);
goto err;
}
if (EVP_PKEY_encrypt(pctx, ek, &eklen, ec->key, ec->keylen) <= 0)
goto err;
ASN1_STRING_set0(ktri->encryptedKey, ek, eklen);
ek = NULL;
ret = 1;
err:
EVP_PKEY_CTX_free(pctx);
ktri->pctx = NULL;
free(ek);
return ret;
}
/* Decrypt content key from KTRI */
static int
cms_RecipientInfo_ktri_decrypt(CMS_ContentInfo *cms, CMS_RecipientInfo *ri)
{
CMS_KeyTransRecipientInfo *ktri = ri->d.ktri;
EVP_PKEY *pkey = ktri->pkey;
unsigned char *ek = NULL;
size_t eklen;
size_t fixlen = 0;
int ret = 0;
CMS_EncryptedContentInfo *ec;
ec = cms->d.envelopedData->encryptedContentInfo;
if (ktri->pkey == NULL) {
CMSerror(CMS_R_NO_PRIVATE_KEY);
return 0;
}
if (cms->d.envelopedData->encryptedContentInfo->havenocert &&
!cms->d.envelopedData->encryptedContentInfo->debug) {
X509_ALGOR *calg = ec->contentEncryptionAlgorithm;
const EVP_CIPHER *ciph;
if ((ciph = EVP_get_cipherbyobj(calg->algorithm)) == NULL) {
CMSerror(CMS_R_UNKNOWN_CIPHER);
return 0;
}
fixlen = EVP_CIPHER_key_length(ciph);
}
ktri->pctx = EVP_PKEY_CTX_new(pkey, NULL);
if (ktri->pctx == NULL)
return 0;
if (EVP_PKEY_decrypt_init(ktri->pctx) <= 0)
goto err;
if (!cms_env_asn1_ctrl(ri, 1))
goto err;
if (EVP_PKEY_CTX_ctrl(ktri->pctx, -1, EVP_PKEY_OP_DECRYPT,
EVP_PKEY_CTRL_CMS_DECRYPT, 0, ri) <= 0) {
CMSerror(CMS_R_CTRL_ERROR);
goto err;
}
if (EVP_PKEY_decrypt(ktri->pctx, NULL, &eklen, ktri->encryptedKey->data,
ktri->encryptedKey->length) <= 0 || eklen == 0 ||
(fixlen != 0 && eklen != fixlen)) {
CMSerror(CMS_R_CMS_LIB);
goto err;
}
ek = malloc(eklen);
if (ek == NULL) {
CMSerror(ERR_R_MALLOC_FAILURE);
goto err;
}
if (EVP_PKEY_decrypt(ktri->pctx, ek, &eklen, ktri->encryptedKey->data,
ktri->encryptedKey->length) <= 0) {
CMSerror(CMS_R_CMS_LIB);
goto err;
}
ret = 1;
freezero(ec->key, ec->keylen);
ec->key = ek;
ec->keylen = eklen;
err:
EVP_PKEY_CTX_free(ktri->pctx);
ktri->pctx = NULL;
if (!ret)
free(ek);
return ret;
}
/* Key Encrypted Key (KEK) RecipientInfo routines */
int
CMS_RecipientInfo_kekri_id_cmp(CMS_RecipientInfo *ri, const unsigned char *id,
size_t idlen)
{
ASN1_OCTET_STRING tmp_os;
CMS_KEKRecipientInfo *kekri;
if (ri->type != CMS_RECIPINFO_KEK) {
CMSerror(CMS_R_NOT_KEK);
return -2;
}
kekri = ri->d.kekri;
tmp_os.type = V_ASN1_OCTET_STRING;
tmp_os.flags = 0;
tmp_os.data = (unsigned char *)id;
tmp_os.length = (int)idlen;
return ASN1_OCTET_STRING_cmp(&tmp_os, kekri->kekid->keyIdentifier);
}
/* For now hard code AES key wrap info */
static size_t
aes_wrap_keylen(int nid)
{
switch (nid) {
case NID_id_aes128_wrap:
return 16;
case NID_id_aes192_wrap:
return 24;
case NID_id_aes256_wrap:
return 32;
default:
return 0;
}
}
CMS_RecipientInfo *
CMS_add0_recipient_key(CMS_ContentInfo *cms, int nid, unsigned char *key,
size_t keylen, unsigned char *id, size_t idlen, ASN1_GENERALIZEDTIME *date,
ASN1_OBJECT *otherTypeId, ASN1_TYPE *otherType)
{
CMS_RecipientInfo *ri = NULL;
CMS_EnvelopedData *env;
CMS_KEKRecipientInfo *kekri;
env = cms_get0_enveloped(cms);
if (!env)
goto err;
if (nid == NID_undef) {
switch (keylen) {
case 16:
nid = NID_id_aes128_wrap;
break;
case 24:
nid = NID_id_aes192_wrap;
break;
case 32:
nid = NID_id_aes256_wrap;
break;
default:
CMSerror(CMS_R_INVALID_KEY_LENGTH);
goto err;
}
} else {
size_t exp_keylen = aes_wrap_keylen(nid);
if (!exp_keylen) {
CMSerror(CMS_R_UNSUPPORTED_KEK_ALGORITHM);
goto err;
}
if (keylen != exp_keylen) {
CMSerror(CMS_R_INVALID_KEY_LENGTH);
goto err;
}
}
/* Initialize recipient info */
ri = (CMS_RecipientInfo *)ASN1_item_new(&CMS_RecipientInfo_it);
if (!ri)
goto merr;
ri->d.kekri = (CMS_KEKRecipientInfo *)ASN1_item_new(&CMS_KEKRecipientInfo_it);
if (!ri->d.kekri)
goto merr;
ri->type = CMS_RECIPINFO_KEK;
kekri = ri->d.kekri;
if (otherTypeId) {
kekri->kekid->other = (CMS_OtherKeyAttribute *)ASN1_item_new(&CMS_OtherKeyAttribute_it);
if (kekri->kekid->other == NULL)
goto merr;
}
if (!sk_CMS_RecipientInfo_push(env->recipientInfos, ri))
goto merr;
/* After this point no calls can fail */
kekri->version = 4;
kekri->key = key;
kekri->keylen = keylen;
ASN1_STRING_set0(kekri->kekid->keyIdentifier, id, idlen);
kekri->kekid->date = date;
if (kekri->kekid->other) {
kekri->kekid->other->keyAttrId = otherTypeId;
kekri->kekid->other->keyAttr = otherType;
}
X509_ALGOR_set0(kekri->keyEncryptionAlgorithm,
OBJ_nid2obj(nid), V_ASN1_UNDEF, NULL);
return ri;
merr:
CMSerror(ERR_R_MALLOC_FAILURE);
err:
ASN1_item_free((ASN1_VALUE *)ri, &CMS_RecipientInfo_it);
return NULL;
}
int
CMS_RecipientInfo_kekri_get0_id(CMS_RecipientInfo *ri, X509_ALGOR **palg,
ASN1_OCTET_STRING **pid, ASN1_GENERALIZEDTIME **pdate,
ASN1_OBJECT **potherid, ASN1_TYPE **pothertype)
{
CMS_KEKIdentifier *rkid;
if (ri->type != CMS_RECIPINFO_KEK) {
CMSerror(CMS_R_NOT_KEK);
return 0;
}
rkid = ri->d.kekri->kekid;
if (palg)
*palg = ri->d.kekri->keyEncryptionAlgorithm;
if (pid)
*pid = rkid->keyIdentifier;
if (pdate)
*pdate = rkid->date;
if (potherid) {
if (rkid->other)
*potherid = rkid->other->keyAttrId;
else
*potherid = NULL;
}
if (pothertype) {
if (rkid->other)
*pothertype = rkid->other->keyAttr;
else
*pothertype = NULL;
}
return 1;
}
int
CMS_RecipientInfo_set0_key(CMS_RecipientInfo *ri, unsigned char *key,
size_t keylen)
{
CMS_KEKRecipientInfo *kekri;
if (ri->type != CMS_RECIPINFO_KEK) {
CMSerror(CMS_R_NOT_KEK);
return 0;
}
kekri = ri->d.kekri;
kekri->key = key;
kekri->keylen = keylen;
return 1;
}
/* Encrypt content key in KEK recipient info */
static int
cms_RecipientInfo_kekri_encrypt(CMS_ContentInfo *cms, CMS_RecipientInfo *ri)
{
CMS_EncryptedContentInfo *ec;
CMS_KEKRecipientInfo *kekri;
AES_KEY actx;
unsigned char *wkey = NULL;
int wkeylen;
int r = 0;
ec = cms->d.envelopedData->encryptedContentInfo;
kekri = ri->d.kekri;
if (!kekri->key) {
CMSerror(CMS_R_NO_KEY);
return 0;
}
if (AES_set_encrypt_key(kekri->key, kekri->keylen << 3, &actx)) {
CMSerror(CMS_R_ERROR_SETTING_KEY);
goto err;
}
wkey = malloc(ec->keylen + 8);
if (wkey == NULL) {
CMSerror(ERR_R_MALLOC_FAILURE);
goto err;
}
wkeylen = AES_wrap_key(&actx, NULL, wkey, ec->key, ec->keylen);
if (wkeylen <= 0) {
CMSerror(CMS_R_WRAP_ERROR);
goto err;
}
ASN1_STRING_set0(kekri->encryptedKey, wkey, wkeylen);
r = 1;
err:
if (!r)
free(wkey);
explicit_bzero(&actx, sizeof(actx));
return r;
}
/* Decrypt content key in KEK recipient info */
static int
cms_RecipientInfo_kekri_decrypt(CMS_ContentInfo *cms, CMS_RecipientInfo *ri)
{
CMS_EncryptedContentInfo *ec;
CMS_KEKRecipientInfo *kekri;
AES_KEY actx;
unsigned char *ukey = NULL;
int ukeylen;
int r = 0, wrap_nid;
ec = cms->d.envelopedData->encryptedContentInfo;
kekri = ri->d.kekri;
if (!kekri->key) {
CMSerror(CMS_R_NO_KEY);
return 0;
}
wrap_nid = OBJ_obj2nid(kekri->keyEncryptionAlgorithm->algorithm);
if (aes_wrap_keylen(wrap_nid) != kekri->keylen) {
CMSerror(CMS_R_INVALID_KEY_LENGTH);
return 0;
}
/* If encrypted key length is invalid don't bother */
if (kekri->encryptedKey->length < 16) {
CMSerror(CMS_R_INVALID_ENCRYPTED_KEY_LENGTH);
goto err;
}
if (AES_set_decrypt_key(kekri->key, kekri->keylen << 3, &actx)) {
CMSerror(CMS_R_ERROR_SETTING_KEY);
goto err;
}
ukey = malloc(kekri->encryptedKey->length - 8);
if (ukey == NULL) {
CMSerror(ERR_R_MALLOC_FAILURE);
goto err;
}
ukeylen = AES_unwrap_key(&actx, NULL, ukey, kekri->encryptedKey->data,
kekri->encryptedKey->length);
if (ukeylen <= 0) {
CMSerror(CMS_R_UNWRAP_ERROR);
goto err;
}
freezero(ec->key, ec->keylen);
ec->key = ukey;
ec->keylen = ukeylen;
r = 1;
err:
if (!r)
free(ukey);
explicit_bzero(&actx, sizeof(actx));
return r;
}
int
CMS_RecipientInfo_decrypt(CMS_ContentInfo *cms, CMS_RecipientInfo *ri)
{
switch (ri->type) {
case CMS_RECIPINFO_TRANS:
return cms_RecipientInfo_ktri_decrypt(cms, ri);
case CMS_RECIPINFO_KEK:
return cms_RecipientInfo_kekri_decrypt(cms, ri);
case CMS_RECIPINFO_PASS:
return cms_RecipientInfo_pwri_crypt(cms, ri, 0);
default:
CMSerror(CMS_R_UNSUPPORTED_RECIPIENTINFO_TYPE);
return 0;
}
}
int
CMS_RecipientInfo_encrypt(CMS_ContentInfo *cms, CMS_RecipientInfo *ri)
{
switch (ri->type) {
case CMS_RECIPINFO_TRANS:
return cms_RecipientInfo_ktri_encrypt(cms, ri);
case CMS_RECIPINFO_AGREE:
return cms_RecipientInfo_kari_encrypt(cms, ri);
case CMS_RECIPINFO_KEK:
return cms_RecipientInfo_kekri_encrypt(cms, ri);
case CMS_RECIPINFO_PASS:
return cms_RecipientInfo_pwri_crypt(cms, ri, 1);
default:
CMSerror(CMS_R_UNSUPPORTED_RECIPIENT_TYPE);
return 0;
}
}
/* Check structures and fixup version numbers (if necessary) */
static void
cms_env_set_originfo_version(CMS_EnvelopedData *env)
{
CMS_OriginatorInfo *org = env->originatorInfo;
int i;
if (org == NULL)
return;
for (i = 0; i < sk_CMS_CertificateChoices_num(org->certificates); i++) {
CMS_CertificateChoices *cch;
cch = sk_CMS_CertificateChoices_value(org->certificates, i);
if (cch->type == CMS_CERTCHOICE_OTHER) {
env->version = 4;
return;
} else if (cch->type == CMS_CERTCHOICE_V2ACERT) {
if (env->version < 3)
env->version = 3;
}
}
for (i = 0; i < sk_CMS_RevocationInfoChoice_num(org->crls); i++) {
CMS_RevocationInfoChoice *rch;
rch = sk_CMS_RevocationInfoChoice_value(org->crls, i);
if (rch->type == CMS_REVCHOICE_OTHER) {
env->version = 4;
return;
}
}
}
static void
cms_env_set_version(CMS_EnvelopedData *env)
{
int i;
CMS_RecipientInfo *ri;
/*
* Can't set version higher than 4 so if 4 or more already nothing to do.
*/
if (env->version >= 4)
return;
cms_env_set_originfo_version(env);
if (env->version >= 3)
return;
for (i = 0; i < sk_CMS_RecipientInfo_num(env->recipientInfos); i++) {
ri = sk_CMS_RecipientInfo_value(env->recipientInfos, i);
if (ri->type == CMS_RECIPINFO_PASS || ri->type == CMS_RECIPINFO_OTHER) {
env->version = 3;
return;
} else if (ri->type != CMS_RECIPINFO_TRANS
|| ri->d.ktri->version != 0) {
env->version = 2;
}
}
if (env->originatorInfo || env->unprotectedAttrs)
env->version = 2;
if (env->version == 2)
return;
env->version = 0;
}
BIO *
cms_EnvelopedData_init_bio(CMS_ContentInfo *cms)
{
CMS_EncryptedContentInfo *ec;
STACK_OF(CMS_RecipientInfo) *rinfos;
CMS_RecipientInfo *ri;
int i, ok = 0;
BIO *ret;
/* Get BIO first to set up key */
ec = cms->d.envelopedData->encryptedContentInfo;
ret = cms_EncryptedContent_init_bio(ec);
/* If error or no cipher end of processing */
if (!ret || !ec->cipher)
return ret;
/* Now encrypt content key according to each RecipientInfo type */
rinfos = cms->d.envelopedData->recipientInfos;
for (i = 0; i < sk_CMS_RecipientInfo_num(rinfos); i++) {
ri = sk_CMS_RecipientInfo_value(rinfos, i);
if (CMS_RecipientInfo_encrypt(cms, ri) <= 0) {
CMSerror(CMS_R_ERROR_SETTING_RECIPIENTINFO);
goto err;
}
}
cms_env_set_version(cms->d.envelopedData);
ok = 1;
err:
ec->cipher = NULL;
freezero(ec->key, ec->keylen);
ec->key = NULL;
ec->keylen = 0;
if (ok)
return ret;
BIO_free(ret);
return NULL;
}
/*
* Get RecipientInfo type (if any) supported by a key (public or private). To
* retain compatibility with previous behaviour if the ctrl value isn't
* supported we assume key transport.
*/
int
cms_pkey_get_ri_type(EVP_PKEY *pk)
{
if (pk->ameth && pk->ameth->pkey_ctrl) {
int i, r;
i = pk->ameth->pkey_ctrl(pk, ASN1_PKEY_CTRL_CMS_RI_TYPE, 0, &r);
if (i > 0)
return r;
}
return CMS_RECIPINFO_TRANS;
}