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authormarha <marha@users.sourceforge.net>2009-06-28 22:07:26 +0000
committermarha <marha@users.sourceforge.net>2009-06-28 22:07:26 +0000
commit3562e78743202e43aec8727005182a2558117eca (patch)
tree8f9113a77d12470c5c851a2a8e4cb02e89df7d43 /openssl/crypto/cms/cms_env.c
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Diffstat (limited to 'openssl/crypto/cms/cms_env.c')
-rw-r--r--openssl/crypto/cms/cms_env.c825
1 files changed, 825 insertions, 0 deletions
diff --git a/openssl/crypto/cms/cms_env.c b/openssl/crypto/cms/cms_env.c
new file mode 100644
index 000000000..d499ae85b
--- /dev/null
+++ b/openssl/crypto/cms/cms_env.c
@@ -0,0 +1,825 @@
+/* crypto/cms/cms_env.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 "cryptlib.h"
+#include <openssl/asn1t.h>
+#include <openssl/pem.h>
+#include <openssl/x509v3.h>
+#include <openssl/err.h>
+#include <openssl/cms.h>
+#include <openssl/rand.h>
+#include <openssl/aes.h>
+#include "cms_lcl.h"
+
+/* CMS EnvelopedData Utilities */
+
+DECLARE_ASN1_ITEM(CMS_EnvelopedData)
+DECLARE_ASN1_ITEM(CMS_RecipientInfo)
+DECLARE_ASN1_ITEM(CMS_KeyTransRecipientInfo)
+DECLARE_ASN1_ITEM(CMS_KEKRecipientInfo)
+DECLARE_ASN1_ITEM(CMS_OtherKeyAttribute)
+
+DECLARE_STACK_OF(CMS_RecipientInfo)
+
+static CMS_EnvelopedData *cms_get0_enveloped(CMS_ContentInfo *cms)
+ {
+ if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_enveloped)
+ {
+ CMSerr(CMS_F_CMS_GET0_ENVELOPED,
+ 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 = M_ASN1_new_of(CMS_EnvelopedData);
+ if (!cms->d.envelopedData)
+ {
+ CMSerr(CMS_F_CMS_ENVELOPED_DATA_INIT,
+ 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);
+ }
+
+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;
+ }
+
+CMS_ContentInfo *CMS_EnvelopedData_create(const EVP_CIPHER *cipher)
+ {
+ CMS_ContentInfo *cms;
+ CMS_EnvelopedData *env;
+ cms = CMS_ContentInfo_new();
+ if (!cms)
+ goto merr;
+ env = cms_enveloped_data_init(cms);
+ if (!env)
+ goto merr;
+ if (!cms_EncryptedContent_init(env->encryptedContentInfo,
+ cipher, NULL, 0))
+ goto merr;
+ return cms;
+ merr:
+ if (cms)
+ CMS_ContentInfo_free(cms);
+ CMSerr(CMS_F_CMS_ENVELOPEDDATA_CREATE, ERR_R_MALLOC_FAILURE);
+ return NULL;
+ }
+
+/* Key Transport Recipient Info (KTRI) routines */
+
+/* Add a recipient certificate. For now only handle key transport.
+ * If we ever handle key agreement will need updating.
+ */
+
+CMS_RecipientInfo *CMS_add1_recipient_cert(CMS_ContentInfo *cms,
+ X509 *recip, unsigned int flags)
+ {
+ CMS_RecipientInfo *ri = NULL;
+ CMS_KeyTransRecipientInfo *ktri;
+ CMS_EnvelopedData *env;
+ EVP_PKEY *pk = NULL;
+ int type;
+ env = cms_get0_enveloped(cms);
+ if (!env)
+ goto err;
+
+ /* Initialize recipient info */
+ ri = M_ASN1_new_of(CMS_RecipientInfo);
+ if (!ri)
+ goto merr;
+
+ /* Initialize and add key transport recipient info */
+
+ ri->d.ktri = M_ASN1_new_of(CMS_KeyTransRecipientInfo);
+ if (!ri->d.ktri)
+ goto merr;
+ ri->type = CMS_RECIPINFO_TRANS;
+
+ ktri = ri->d.ktri;
+
+ X509_check_purpose(recip, -1, -1);
+ pk = X509_get_pubkey(recip);
+ if (!pk)
+ {
+ CMSerr(CMS_F_CMS_ADD1_RECIPIENT_CERT,
+ CMS_R_ERROR_GETTING_PUBLIC_KEY);
+ goto err;
+ }
+ CRYPTO_add(&recip->references, 1, CRYPTO_LOCK_X509);
+ ktri->pkey = pk;
+ ktri->recip = recip;
+
+ if (flags & CMS_USE_KEYID)
+ {
+ ktri->version = 2;
+ type = CMS_RECIPINFO_KEYIDENTIFIER;
+ }
+ else
+ {
+ ktri->version = 0;
+ type = CMS_RECIPINFO_ISSUER_SERIAL;
+ }
+
+ /* Not a typo: RecipientIdentifier and SignerIdentifier are the
+ * same structure.
+ */
+
+ if (!cms_set1_SignerIdentifier(ktri->rid, recip, type))
+ goto err;
+
+ /* Since we have no EVP_PKEY_ASN1_METHOD in OpenSSL 0.9.8,
+ * hard code algorithm parameters.
+ */
+
+ if (pk->type == EVP_PKEY_RSA)
+ {
+ X509_ALGOR_set0(ktri->keyEncryptionAlgorithm,
+ OBJ_nid2obj(NID_rsaEncryption),
+ V_ASN1_NULL, 0);
+ }
+ else
+ {
+ CMSerr(CMS_F_CMS_ADD1_RECIPIENT_CERT,
+ CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
+ goto err;
+ }
+
+ if (!sk_CMS_RecipientInfo_push(env->recipientInfos, ri))
+ goto merr;
+
+ return ri;
+
+ merr:
+ CMSerr(CMS_F_CMS_ADD1_RECIPIENT_CERT, ERR_R_MALLOC_FAILURE);
+ err:
+ if (ri)
+ M_ASN1_free_of(ri, CMS_RecipientInfo);
+ 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)
+ {
+ CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_GET0_ALGS,
+ 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)
+ {
+ CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_GET0_SIGNER_ID,
+ 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)
+ {
+ CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_CERT_CMP,
+ 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)
+ {
+ CMSerr(CMS_F_CMS_RECIPIENTINFO_SET0_PKEY,
+ CMS_R_NOT_KEY_TRANSPORT);
+ return 0;
+ }
+ 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;
+ unsigned char *ek = NULL;
+ int eklen;
+
+ int ret = 0;
+
+ if (ri->type != CMS_RECIPINFO_TRANS)
+ {
+ CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_ENCRYPT,
+ CMS_R_NOT_KEY_TRANSPORT);
+ return 0;
+ }
+ ktri = ri->d.ktri;
+ ec = cms->d.envelopedData->encryptedContentInfo;
+
+ eklen = EVP_PKEY_size(ktri->pkey);
+
+ ek = OPENSSL_malloc(eklen);
+
+ if (ek == NULL)
+ {
+ CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_ENCRYPT,
+ ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+
+ eklen = EVP_PKEY_encrypt(ek, ec->key, ec->keylen, ktri->pkey);
+
+ if (eklen <= 0)
+ goto err;
+
+ ASN1_STRING_set0(ktri->encryptedKey, ek, eklen);
+ ek = NULL;
+
+ ret = 1;
+
+ err:
+ if (ek)
+ 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;
+ unsigned char *ek = NULL;
+ int eklen;
+ int ret = 0;
+
+ if (ktri->pkey == NULL)
+ {
+ CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_DECRYPT,
+ CMS_R_NO_PRIVATE_KEY);
+ return 0;
+ }
+
+ eklen = EVP_PKEY_size(ktri->pkey);
+
+ ek = OPENSSL_malloc(eklen);
+
+ if (ek == NULL)
+ {
+ CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_DECRYPT,
+ ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+
+ eklen = EVP_PKEY_decrypt(ek,
+ ktri->encryptedKey->data,
+ ktri->encryptedKey->length, ktri->pkey);
+ if (eklen <= 0)
+ {
+ CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_DECRYPT, CMS_R_CMS_LIB);
+ goto err;
+ }
+
+ ret = 1;
+
+ cms->d.envelopedData->encryptedContentInfo->key = ek;
+ cms->d.envelopedData->encryptedContentInfo->keylen = eklen;
+
+ err:
+ if (!ret && ek)
+ 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)
+ {
+ CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_ID_CMP, 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:
+ CMSerr(CMS_F_CMS_ADD0_RECIPIENT_KEY,
+ CMS_R_INVALID_KEY_LENGTH);
+ goto err;
+ }
+
+ }
+ else
+ {
+
+ size_t exp_keylen = aes_wrap_keylen(nid);
+
+ if (!exp_keylen)
+ {
+ CMSerr(CMS_F_CMS_ADD0_RECIPIENT_KEY,
+ CMS_R_UNSUPPORTED_KEK_ALGORITHM);
+ goto err;
+ }
+
+ if (keylen != exp_keylen)
+ {
+ CMSerr(CMS_F_CMS_ADD0_RECIPIENT_KEY,
+ 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(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:
+ CMSerr(CMS_F_CMS_ADD0_RECIPIENT_KEY, ERR_R_MALLOC_FAILURE);
+ err:
+ if (ri)
+ 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)
+ {
+ CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_GET0_ID, 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)
+ {
+ CMSerr(CMS_F_CMS_RECIPIENTINFO_SET0_KEY, 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)
+ {
+ CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_ENCRYPT, CMS_R_NO_KEY);
+ return 0;
+ }
+
+ if (AES_set_encrypt_key(kekri->key, kekri->keylen << 3, &actx))
+ {
+ CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_ENCRYPT,
+ CMS_R_ERROR_SETTING_KEY);
+ goto err;
+ }
+
+ wkey = OPENSSL_malloc(ec->keylen + 8);
+
+ if (!wkey)
+ {
+ CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_ENCRYPT,
+ ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+
+ wkeylen = AES_wrap_key(&actx, NULL, wkey, ec->key, ec->keylen);
+
+ if (wkeylen <= 0)
+ {
+ CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_ENCRYPT, CMS_R_WRAP_ERROR);
+ goto err;
+ }
+
+ ASN1_STRING_set0(kekri->encryptedKey, wkey, wkeylen);
+
+ r = 1;
+
+ err:
+
+ if (!r && wkey)
+ OPENSSL_free(wkey);
+ OPENSSL_cleanse(&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)
+ {
+ CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT, CMS_R_NO_KEY);
+ return 0;
+ }
+
+ wrap_nid = OBJ_obj2nid(kekri->keyEncryptionAlgorithm->algorithm);
+ if (aes_wrap_keylen(wrap_nid) != kekri->keylen)
+ {
+ CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT,
+ CMS_R_INVALID_KEY_LENGTH);
+ return 0;
+ }
+
+ /* If encrypted key length is invalid don't bother */
+
+ if (kekri->encryptedKey->length < 16)
+ {
+ CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT,
+ CMS_R_INVALID_ENCRYPTED_KEY_LENGTH);
+ goto err;
+ }
+
+ if (AES_set_decrypt_key(kekri->key, kekri->keylen << 3, &actx))
+ {
+ CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT,
+ CMS_R_ERROR_SETTING_KEY);
+ goto err;
+ }
+
+ ukey = OPENSSL_malloc(kekri->encryptedKey->length - 8);
+
+ if (!ukey)
+ {
+ CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT,
+ ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+
+ ukeylen = AES_unwrap_key(&actx, NULL, ukey,
+ kekri->encryptedKey->data,
+ kekri->encryptedKey->length);
+
+ if (ukeylen <= 0)
+ {
+ CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT,
+ CMS_R_UNWRAP_ERROR);
+ goto err;
+ }
+
+ ec->key = ukey;
+ ec->keylen = ukeylen;
+
+ r = 1;
+
+ err:
+
+ if (!r && ukey)
+ OPENSSL_free(ukey);
+ OPENSSL_cleanse(&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);
+
+ default:
+ CMSerr(CMS_F_CMS_RECIPIENTINFO_DECRYPT,
+ CMS_R_UNSUPPORTED_RECPIENTINFO_TYPE);
+ return 0;
+ }
+ }
+
+BIO *cms_EnvelopedData_init_bio(CMS_ContentInfo *cms)
+ {
+ CMS_EncryptedContentInfo *ec;
+ STACK_OF(CMS_RecipientInfo) *rinfos;
+ CMS_RecipientInfo *ri;
+ int i, r, 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);
+
+ switch (ri->type)
+ {
+ case CMS_RECIPINFO_TRANS:
+ r = cms_RecipientInfo_ktri_encrypt(cms, ri);
+ break;
+
+ case CMS_RECIPINFO_KEK:
+ r = cms_RecipientInfo_kekri_encrypt(cms, ri);
+ break;
+
+ default:
+ CMSerr(CMS_F_CMS_ENVELOPEDDATA_INIT_BIO,
+ CMS_R_UNSUPPORTED_RECIPIENT_TYPE);
+ goto err;
+ }
+
+ if (r <= 0)
+ {
+ CMSerr(CMS_F_CMS_ENVELOPEDDATA_INIT_BIO,
+ CMS_R_ERROR_SETTING_RECIPIENTINFO);
+ goto err;
+ }
+ }
+
+ ok = 1;
+
+ err:
+ ec->cipher = NULL;
+ if (ec->key)
+ {
+ OPENSSL_cleanse(ec->key, ec->keylen);
+ OPENSSL_free(ec->key);
+ ec->key = NULL;
+ ec->keylen = 0;
+ }
+ if (ok)
+ return ret;
+ BIO_free(ret);
+ return NULL;
+
+ }