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cms_env.c
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cms_env.c
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/*
* Copyright 2008-2023 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/x509v3.h>
#include <openssl/err.h>
#include <openssl/cms.h>
#include <openssl/evp.h>
#include "internal/sizes.h"
#include "crypto/asn1.h"
#include "crypto/evp.h"
#include "crypto/x509.h"
#include "cms_local.h"
/* CMS EnvelopedData Utilities */
static void cms_env_set_version(CMS_EnvelopedData *env);
#define CMS_ENVELOPED_STANDARD 1
#define CMS_ENVELOPED_AUTH 2
static int cms_get_enveloped_type(const CMS_ContentInfo *cms)
{
int nid = OBJ_obj2nid(cms->contentType);
switch (nid) {
case NID_pkcs7_enveloped:
return CMS_ENVELOPED_STANDARD;
case NID_id_smime_ct_authEnvelopedData:
return CMS_ENVELOPED_AUTH;
default:
ERR_raise(ERR_LIB_CMS, CMS_R_CONTENT_TYPE_NOT_ENVELOPED_DATA);
return 0;
}
}
CMS_EnvelopedData *ossl_cms_get0_enveloped(CMS_ContentInfo *cms)
{
if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_enveloped) {
ERR_raise(ERR_LIB_CMS, CMS_R_CONTENT_TYPE_NOT_ENVELOPED_DATA);
return NULL;
}
return cms->d.envelopedData;
}
CMS_AuthEnvelopedData *ossl_cms_get0_auth_enveloped(CMS_ContentInfo *cms)
{
if (OBJ_obj2nid(cms->contentType) != NID_id_smime_ct_authEnvelopedData) {
ERR_raise(ERR_LIB_CMS, CMS_R_CONTENT_TYPE_NOT_ENVELOPED_DATA);
return NULL;
}
return cms->d.authEnvelopedData;
}
static CMS_EnvelopedData *cms_enveloped_data_init(CMS_ContentInfo *cms)
{
if (cms->d.other == NULL) {
cms->d.envelopedData = M_ASN1_new_of(CMS_EnvelopedData);
if (cms->d.envelopedData == NULL) {
ERR_raise(ERR_LIB_CMS, 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 ossl_cms_get0_enveloped(cms);
}
static CMS_AuthEnvelopedData *
cms_auth_enveloped_data_init(CMS_ContentInfo *cms)
{
if (cms->d.other == NULL) {
cms->d.authEnvelopedData = M_ASN1_new_of(CMS_AuthEnvelopedData);
if (cms->d.authEnvelopedData == NULL) {
ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
return NULL;
}
/* Defined in RFC 5083 - Section 2.1. "AuthEnvelopedData Type" */
cms->d.authEnvelopedData->version = 0;
cms->d.authEnvelopedData->authEncryptedContentInfo->contentType =
OBJ_nid2obj(NID_pkcs7_data);
ASN1_OBJECT_free(cms->contentType);
cms->contentType = OBJ_nid2obj(NID_id_smime_ct_authEnvelopedData);
return cms->d.authEnvelopedData;
}
return ossl_cms_get0_auth_enveloped(cms);
}
int ossl_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 == NULL)
return 0;
pkey = EVP_PKEY_CTX_get0_pkey(pctx);
if (pkey == NULL)
return 0;
} else
return 0;
if (EVP_PKEY_is_a(pkey, "DHX") || EVP_PKEY_is_a(pkey, "DH"))
return ossl_cms_dh_envelope(ri, cmd);
else if (EVP_PKEY_is_a(pkey, "EC"))
return ossl_cms_ecdh_envelope(ri, cmd);
else if (EVP_PKEY_is_a(pkey, "RSA"))
return ossl_cms_rsa_envelope(ri, cmd);
/* Something else? We'll give engines etc a chance to handle this */
if (pkey->ameth == NULL || pkey->ameth->pkey_ctrl == NULL)
return 1;
i = pkey->ameth->pkey_ctrl(pkey, ASN1_PKEY_CTRL_CMS_ENVELOPE, cmd, ri);
if (i == -2) {
ERR_raise(ERR_LIB_CMS, CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
return 0;
}
if (i <= 0) {
ERR_raise(ERR_LIB_CMS, CMS_R_CTRL_FAILURE);
return 0;
}
return 1;
}
CMS_EncryptedContentInfo *ossl_cms_get0_env_enc_content(const CMS_ContentInfo *cms)
{
switch (cms_get_enveloped_type(cms)) {
case CMS_ENVELOPED_STANDARD:
return cms->d.envelopedData == NULL ? NULL
: cms->d.envelopedData->encryptedContentInfo;
case CMS_ENVELOPED_AUTH:
return cms->d.authEnvelopedData == NULL ? NULL
: cms->d.authEnvelopedData->authEncryptedContentInfo;
default:
return NULL;
}
}
STACK_OF(CMS_RecipientInfo) *CMS_get0_RecipientInfos(CMS_ContentInfo *cms)
{
switch (cms_get_enveloped_type(cms)) {
case CMS_ENVELOPED_STANDARD:
return cms->d.envelopedData->recipientInfos;
case CMS_ENVELOPED_AUTH:
return cms->d.authEnvelopedData->recipientInfos;
default:
return NULL;
}
}
void ossl_cms_RecipientInfos_set_cmsctx(CMS_ContentInfo *cms)
{
int i;
CMS_RecipientInfo *ri;
const CMS_CTX *ctx = ossl_cms_get0_cmsctx(cms);
STACK_OF(CMS_RecipientInfo) *rinfos = CMS_get0_RecipientInfos(cms);
for (i = 0; i < sk_CMS_RecipientInfo_num(rinfos); i++) {
ri = sk_CMS_RecipientInfo_value(rinfos, i);
if (ri != NULL) {
switch (ri->type) {
case CMS_RECIPINFO_AGREE:
ri->d.kari->cms_ctx = ctx;
break;
case CMS_RECIPINFO_TRANS:
ri->d.ktri->cms_ctx = ctx;
ossl_x509_set0_libctx(ri->d.ktri->recip,
ossl_cms_ctx_get0_libctx(ctx),
ossl_cms_ctx_get0_propq(ctx));
break;
case CMS_RECIPINFO_KEK:
ri->d.kekri->cms_ctx = ctx;
break;
case CMS_RECIPINFO_PASS:
ri->d.pwri->cms_ctx = ctx;
break;
default:
break;
}
}
}
}
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_ex(const EVP_CIPHER *cipher,
OSSL_LIB_CTX *libctx,
const char *propq)
{
CMS_ContentInfo *cms;
CMS_EnvelopedData *env;
cms = CMS_ContentInfo_new_ex(libctx, propq);
if (cms == NULL)
goto merr;
env = cms_enveloped_data_init(cms);
if (env == NULL)
goto merr;
if (!ossl_cms_EncryptedContent_init(env->encryptedContentInfo, cipher, NULL,
0, ossl_cms_get0_cmsctx(cms)))
goto merr;
return cms;
merr:
CMS_ContentInfo_free(cms);
ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
return NULL;
}
CMS_ContentInfo *CMS_EnvelopedData_create(const EVP_CIPHER *cipher)
{
return CMS_EnvelopedData_create_ex(cipher, NULL, NULL);
}
CMS_ContentInfo *
CMS_AuthEnvelopedData_create_ex(const EVP_CIPHER *cipher, OSSL_LIB_CTX *libctx,
const char *propq)
{
CMS_ContentInfo *cms;
CMS_AuthEnvelopedData *aenv;
cms = CMS_ContentInfo_new_ex(libctx, propq);
if (cms == NULL)
goto merr;
aenv = cms_auth_enveloped_data_init(cms);
if (aenv == NULL)
goto merr;
if (!ossl_cms_EncryptedContent_init(aenv->authEncryptedContentInfo,
cipher, NULL, 0,
ossl_cms_get0_cmsctx(cms)))
goto merr;
return cms;
merr:
CMS_ContentInfo_free(cms);
ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
return NULL;
}
CMS_ContentInfo *CMS_AuthEnvelopedData_create(const EVP_CIPHER *cipher)
{
return CMS_AuthEnvelopedData_create_ex(cipher, NULL, 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,
const CMS_CTX *ctx)
{
CMS_KeyTransRecipientInfo *ktri;
int idtype;
ri->d.ktri = M_ASN1_new_of(CMS_KeyTransRecipientInfo);
if (!ri->d.ktri)
return 0;
ri->type = CMS_RECIPINFO_TRANS;
ktri = ri->d.ktri;
ktri->cms_ctx = ctx;
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 (!ossl_cms_set1_SignerIdentifier(ktri->rid, recip, idtype, ctx))
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_from_pkey(ossl_cms_ctx_get0_libctx(ctx),
ktri->pkey,
ossl_cms_ctx_get0_propq(ctx));
if (ktri->pctx == NULL)
return 0;
if (EVP_PKEY_encrypt_init(ktri->pctx) <= 0)
return 0;
} else if (!ossl_cms_env_asn1_ctrl(ri, 0))
return 0;
return 1;
}
/*
* Add a recipient certificate using appropriate type of RecipientInfo
*/
CMS_RecipientInfo *CMS_add1_recipient(CMS_ContentInfo *cms, X509 *recip,
EVP_PKEY *originatorPrivKey,
X509 *originator, unsigned int flags)
{
CMS_RecipientInfo *ri = NULL;
STACK_OF(CMS_RecipientInfo) *ris;
EVP_PKEY *pk = NULL;
const CMS_CTX *ctx = ossl_cms_get0_cmsctx(cms);
ris = CMS_get0_RecipientInfos(cms);
if (ris == NULL)
goto err;
/* Initialize recipient info */
ri = M_ASN1_new_of(CMS_RecipientInfo);
if (ri == NULL)
goto merr;
pk = X509_get0_pubkey(recip);
if (pk == NULL) {
ERR_raise(ERR_LIB_CMS, CMS_R_ERROR_GETTING_PUBLIC_KEY);
goto err;
}
switch (ossl_cms_pkey_get_ri_type(pk)) {
case CMS_RECIPINFO_TRANS:
if (!cms_RecipientInfo_ktri_init(ri, recip, pk, flags, ctx))
goto err;
break;
case CMS_RECIPINFO_AGREE:
if (!ossl_cms_RecipientInfo_kari_init(ri, recip, pk, originator,
originatorPrivKey, flags, ctx))
goto err;
break;
default:
ERR_raise(ERR_LIB_CMS, CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
goto err;
}
if (!sk_CMS_RecipientInfo_push(ris, ri))
goto merr;
return ri;
merr:
ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
err:
M_ASN1_free_of(ri, CMS_RecipientInfo);
return NULL;
}
CMS_RecipientInfo *CMS_add1_recipient_cert(CMS_ContentInfo *cms, X509 *recip,
unsigned int flags)
{
return CMS_add1_recipient(cms, recip, NULL, NULL, flags);
}
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) {
ERR_raise(ERR_LIB_CMS, 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) {
ERR_raise(ERR_LIB_CMS, CMS_R_NOT_KEY_TRANSPORT);
return 0;
}
ktri = ri->d.ktri;
return ossl_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) {
ERR_raise(ERR_LIB_CMS, CMS_R_NOT_KEY_TRANSPORT);
return -2;
}
return ossl_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) {
ERR_raise(ERR_LIB_CMS, 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(const CMS_ContentInfo *cms,
CMS_RecipientInfo *ri)
{
CMS_KeyTransRecipientInfo *ktri;
CMS_EncryptedContentInfo *ec;
EVP_PKEY_CTX *pctx;
unsigned char *ek = NULL;
size_t eklen;
const CMS_CTX *ctx = ossl_cms_get0_cmsctx(cms);
int ret = 0;
if (ri->type != CMS_RECIPINFO_TRANS) {
ERR_raise(ERR_LIB_CMS, CMS_R_NOT_KEY_TRANSPORT);
return 0;
}
ktri = ri->d.ktri;
ec = ossl_cms_get0_env_enc_content(cms);
pctx = ktri->pctx;
if (pctx) {
if (!ossl_cms_env_asn1_ctrl(ri, 0))
goto err;
} else {
pctx = EVP_PKEY_CTX_new_from_pkey(ossl_cms_ctx_get0_libctx(ctx),
ktri->pkey,
ossl_cms_ctx_get0_propq(ctx));
if (pctx == NULL)
return 0;
if (EVP_PKEY_encrypt_init(pctx) <= 0)
goto err;
}
if (EVP_PKEY_encrypt(pctx, NULL, &eklen, ec->key, ec->keylen) <= 0)
goto err;
ek = OPENSSL_malloc(eklen);
if (ek == NULL) {
ERR_raise(ERR_LIB_CMS, 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;
OPENSSL_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;
int ret = 0;
size_t fixlen = 0;
const EVP_CIPHER *cipher = NULL;
EVP_CIPHER *fetched_cipher = NULL;
CMS_EncryptedContentInfo *ec;
const CMS_CTX *ctx = ossl_cms_get0_cmsctx(cms);
OSSL_LIB_CTX *libctx = ossl_cms_ctx_get0_libctx(ctx);
const char *propq = ossl_cms_ctx_get0_propq(ctx);
ec = ossl_cms_get0_env_enc_content(cms);
if (ktri->pkey == NULL) {
ERR_raise(ERR_LIB_CMS, CMS_R_NO_PRIVATE_KEY);
return 0;
}
if (cms->d.envelopedData->encryptedContentInfo->havenocert
&& !cms->d.envelopedData->encryptedContentInfo->debug) {
X509_ALGOR *calg = ec->contentEncryptionAlgorithm;
char name[OSSL_MAX_NAME_SIZE];
OBJ_obj2txt(name, sizeof(name), calg->algorithm, 0);
(void)ERR_set_mark();
fetched_cipher = EVP_CIPHER_fetch(libctx, name, propq);
if (fetched_cipher != NULL)
cipher = fetched_cipher;
else
cipher = EVP_get_cipherbyobj(calg->algorithm);
if (cipher == NULL) {
(void)ERR_clear_last_mark();
ERR_raise(ERR_LIB_CMS, CMS_R_UNKNOWN_CIPHER);
return 0;
}
(void)ERR_pop_to_mark();
fixlen = EVP_CIPHER_get_key_length(cipher);
EVP_CIPHER_free(fetched_cipher);
}
ktri->pctx = EVP_PKEY_CTX_new_from_pkey(libctx, pkey, propq);
if (ktri->pctx == NULL)
goto err;
if (EVP_PKEY_decrypt_init(ktri->pctx) <= 0)
goto err;
if (!ossl_cms_env_asn1_ctrl(ri, 1))
goto err;
if (EVP_PKEY_decrypt(ktri->pctx, NULL, &eklen,
ktri->encryptedKey->data,
ktri->encryptedKey->length) <= 0)
goto err;
ek = OPENSSL_malloc(eklen);
if (ek == NULL) {
ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
goto err;
}
if (EVP_PKEY_decrypt(ktri->pctx, ek, &eklen,
ktri->encryptedKey->data,
ktri->encryptedKey->length) <= 0
|| eklen == 0
|| (fixlen != 0 && eklen != fixlen)) {
ERR_raise(ERR_LIB_CMS, CMS_R_CMS_LIB);
goto err;
}
ret = 1;
OPENSSL_clear_free(ec->key, ec->keylen);
ec->key = ek;
ec->keylen = eklen;
err:
EVP_PKEY_CTX_free(ktri->pctx);
ktri->pctx = NULL;
if (!ret)
OPENSSL_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) {
ERR_raise(ERR_LIB_CMS, 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_KEKRecipientInfo *kekri;
STACK_OF(CMS_RecipientInfo) *ris = CMS_get0_RecipientInfos(cms);
if (ris == NULL)
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:
ERR_raise(ERR_LIB_CMS, CMS_R_INVALID_KEY_LENGTH);
goto err;
}
} else {
size_t exp_keylen = aes_wrap_keylen(nid);
if (!exp_keylen) {
ERR_raise(ERR_LIB_CMS, CMS_R_UNSUPPORTED_KEK_ALGORITHM);
goto err;
}
if (keylen != exp_keylen) {
ERR_raise(ERR_LIB_CMS, CMS_R_INVALID_KEY_LENGTH);
goto err;
}
}
/* Initialize recipient info */
ri = M_ASN1_new_of(CMS_RecipientInfo);
if (!ri)
goto merr;
ri->d.kekri = M_ASN1_new_of(CMS_KEKRecipientInfo);
if (!ri->d.kekri)
goto merr;
ri->type = CMS_RECIPINFO_KEK;
kekri = ri->d.kekri;
if (otherTypeId) {
kekri->kekid->other = M_ASN1_new_of(CMS_OtherKeyAttribute);
if (kekri->kekid->other == NULL)
goto merr;
}
if (!sk_CMS_RecipientInfo_push(ris, 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:
ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
err:
M_ASN1_free_of(ri, CMS_RecipientInfo);
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) {
ERR_raise(ERR_LIB_CMS, 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) {
ERR_raise(ERR_LIB_CMS, CMS_R_NOT_KEK);
return 0;
}
kekri = ri->d.kekri;
kekri->key = key;
kekri->keylen = keylen;
return 1;
}
static EVP_CIPHER *cms_get_key_wrap_cipher(size_t keylen, const CMS_CTX *ctx)
{
const char *alg = NULL;
switch(keylen) {
case 16:
alg = "AES-128-WRAP";
break;
case 24:
alg = "AES-192-WRAP";
break;
case 32:
alg = "AES-256-WRAP";
break;
default:
return NULL;
}
return EVP_CIPHER_fetch(ossl_cms_ctx_get0_libctx(ctx), alg,
ossl_cms_ctx_get0_propq(ctx));
}
/* Encrypt content key in KEK recipient info */
static int cms_RecipientInfo_kekri_encrypt(const CMS_ContentInfo *cms,
CMS_RecipientInfo *ri)
{
CMS_EncryptedContentInfo *ec;
CMS_KEKRecipientInfo *kekri;
unsigned char *wkey = NULL;
int wkeylen;
int r = 0;
EVP_CIPHER *cipher = NULL;
int outlen = 0;
EVP_CIPHER_CTX *ctx = NULL;
const CMS_CTX *cms_ctx = ossl_cms_get0_cmsctx(cms);
ec = ossl_cms_get0_env_enc_content(cms);
if (ec == NULL)
return 0;
kekri = ri->d.kekri;
if (kekri->key == NULL) {
ERR_raise(ERR_LIB_CMS, CMS_R_NO_KEY);
return 0;
}
cipher = cms_get_key_wrap_cipher(kekri->keylen, cms_ctx);
if (cipher == NULL) {
ERR_raise(ERR_LIB_CMS, CMS_R_INVALID_KEY_LENGTH);
goto err;
}
/* 8 byte prefix for AES wrap ciphers */
wkey = OPENSSL_malloc(ec->keylen + 8);
if (wkey == NULL) {
ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
goto err;
}
ctx = EVP_CIPHER_CTX_new();
if (ctx == NULL) {
ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
goto err;
}
EVP_CIPHER_CTX_set_flags(ctx, EVP_CIPHER_CTX_FLAG_WRAP_ALLOW);
if (!EVP_EncryptInit_ex(ctx, cipher, NULL, kekri->key, NULL)
|| !EVP_EncryptUpdate(ctx, wkey, &wkeylen, ec->key, ec->keylen)
|| !EVP_EncryptFinal_ex(ctx, wkey + wkeylen, &outlen)) {
ERR_raise(ERR_LIB_CMS, CMS_R_WRAP_ERROR);
goto err;
}
wkeylen += outlen;
if (!ossl_assert((size_t)wkeylen == ec->keylen + 8)) {
ERR_raise(ERR_LIB_CMS, CMS_R_WRAP_ERROR);
goto err;
}
ASN1_STRING_set0(kekri->encryptedKey, wkey, wkeylen);
r = 1;
err:
EVP_CIPHER_free(cipher);
if (!r)
OPENSSL_free(wkey);
EVP_CIPHER_CTX_free(ctx);
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;
unsigned char *ukey = NULL;
int ukeylen;
int r = 0, wrap_nid;
EVP_CIPHER *cipher = NULL;
int outlen = 0;
EVP_CIPHER_CTX *ctx = NULL;
const CMS_CTX *cms_ctx = ossl_cms_get0_cmsctx(cms);
ec = ossl_cms_get0_env_enc_content(cms);
if (ec == NULL)
return 0;
kekri = ri->d.kekri;
if (!kekri->key) {
ERR_raise(ERR_LIB_CMS, CMS_R_NO_KEY);
return 0;
}
wrap_nid = OBJ_obj2nid(kekri->keyEncryptionAlgorithm->algorithm);
if (aes_wrap_keylen(wrap_nid) != kekri->keylen) {
ERR_raise(ERR_LIB_CMS, CMS_R_INVALID_KEY_LENGTH);
return 0;
}
/* If encrypted key length is invalid don't bother */
if (kekri->encryptedKey->length < 16) {
ERR_raise(ERR_LIB_CMS, CMS_R_INVALID_ENCRYPTED_KEY_LENGTH);
goto err;
}
cipher = cms_get_key_wrap_cipher(kekri->keylen, cms_ctx);
if (cipher == NULL) {
ERR_raise(ERR_LIB_CMS, CMS_R_INVALID_KEY_LENGTH);
goto err;
}
ukey = OPENSSL_malloc(kekri->encryptedKey->length - 8);
if (ukey == NULL) {
ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
goto err;
}
ctx = EVP_CIPHER_CTX_new();
if (ctx == NULL) {
ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
goto err;
}
if (!EVP_DecryptInit_ex(ctx, cipher, NULL, kekri->key, NULL)
|| !EVP_DecryptUpdate(ctx, ukey, &ukeylen,
kekri->encryptedKey->data,
kekri->encryptedKey->length)
|| !EVP_DecryptFinal_ex(ctx, ukey + ukeylen, &outlen)) {
ERR_raise(ERR_LIB_CMS, CMS_R_UNWRAP_ERROR);
goto err;
}
ukeylen += outlen;
OPENSSL_clear_free(ec->key, ec->keylen);
ec->key = ukey;
ec->keylen = ukeylen;
r = 1;
err:
EVP_CIPHER_free(cipher);
if (!r)
OPENSSL_free(ukey);
EVP_CIPHER_CTX_free(ctx);
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 ossl_cms_RecipientInfo_pwri_crypt(cms, ri, 0);
default:
ERR_raise(ERR_LIB_CMS, CMS_R_UNSUPPORTED_RECIPIENTINFO_TYPE);
return 0;
}
}
int CMS_RecipientInfo_encrypt(const 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 ossl_cms_RecipientInfo_kari_encrypt(cms, ri);
case CMS_RECIPINFO_KEK:
return cms_RecipientInfo_kekri_encrypt(cms, ri);