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/*
* The contents of this file are subject to the Mozilla Public
* License Version 1.1 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is the Netscape security libraries.
*
* The Initial Developer of the Original Code is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1994-2000 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the
* terms of the GNU General Public License Version 2 or later (the
* "GPL"), in which case the provisions of the GPL are applicable
* instead of those above. If you wish to allow use of your
* version of this file only under the terms of the GPL and not to
* allow others to use your version of this file under the MPL,
* indicate your decision by deleting the provisions above and
* replace them with the notice and other provisions required by
* the GPL. If you do not delete the provisions above, a recipient
* may use your version of this file under either the MPL or the
* GPL.
*/
/*
* This file implements the Symkey wrapper and the PKCS context
* Interfaces.
*/
#include "seccomon.h"
#include "secmod.h"
#include "nssilock.h"
#include "secmodi.h"
#include "pkcs11.h"
#include "pk11func.h"
#include "secitem.h"
#include "key.h"
#include "secasn1.h"
#include "sechash.h"
#include "cert.h"
#include "secerr.h"
/*
* find an RSA public key on a card
*/
static CK_OBJECT_HANDLE
pk11_FindRSAPubKey(PK11SlotInfo *slot)
{
CK_KEY_TYPE key_type = CKK_RSA;
CK_OBJECT_CLASS class_type = CKO_PUBLIC_KEY;
CK_ATTRIBUTE theTemplate[2];
int template_count = sizeof(theTemplate)/sizeof(theTemplate[0]);
CK_ATTRIBUTE *attrs = theTemplate;
PK11_SETATTRS(attrs,CKA_CLASS,&class_type,sizeof(class_type)); attrs++;
PK11_SETATTRS(attrs,CKA_KEY_TYPE,&key_type,sizeof(key_type)); attrs++;
template_count = attrs - theTemplate;
PR_ASSERT(template_count <= sizeof(theTemplate)/sizeof(CK_ATTRIBUTE));
return pk11_FindObjectByTemplate(slot,theTemplate,template_count);
}
SECKEYPublicKey *PK11_ExtractPublicKey(PK11SlotInfo *slot, KeyType keyType,
CK_OBJECT_HANDLE id);
PK11SymKey *
pk11_KeyExchange(PK11SlotInfo *slot,CK_MECHANISM_TYPE type,
CK_ATTRIBUTE_TYPE operation, PK11SymKey *symKey)
{
PK11SymKey *newSymKey = NULL;
SECStatus rv;
/* performance improvement can go here --- use a generated key to as a
* per startup wrapping key. If it exists, use it, otherwise do a full
* key exchange. */
/* find a common Key Exchange algorithm */
/* RSA */
if (PK11_DoesMechanism(symKey->slot, CKM_RSA_PKCS) &&
PK11_DoesMechanism(slot,CKM_RSA_PKCS)) {
CK_OBJECT_HANDLE pubKeyHandle = CK_INVALID_KEY;
CK_OBJECT_HANDLE privKeyHandle = CK_INVALID_KEY;
SECKEYPublicKey *pubKey = NULL;
SECKEYPrivateKey *privKey = NULL;
SECItem wrapData;
wrapData.data = NULL;
/* find RSA Public Key on target */
pubKeyHandle = pk11_FindRSAPubKey(slot);
if (pubKeyHandle != CK_INVALID_KEY) {
privKeyHandle = PK11_MatchItem(slot,pubKeyHandle,CKO_PRIVATE_KEY);
}
/* if no key exits, generate a key pair */
if (privKeyHandle == CK_INVALID_KEY) {
unsigned int keyLength = PK11_GetKeyLength(symKey);
PK11RSAGenParams rsaParams;
rsaParams.keySizeInBits =
((keyLength == 0) || (keyLength > 16)) ? 512 : 256;
rsaParams.pe = 0x10001;
privKey = PK11_GenerateKeyPair(slot,CKM_RSA_PKCS_KEY_PAIR_GEN,
&rsaParams, &pubKey,PR_FALSE,PR_TRUE,symKey->cx);
} else {
/* if key's exist, build SECKEY data structures for them */
privKey = PK11_MakePrivKey(slot,nullKey, PR_TRUE, privKeyHandle,
symKey->cx);
if (privKey != NULL) {
pubKey = PK11_ExtractPublicKey(slot, rsaKey, pubKeyHandle);
if (pubKey && pubKey->pkcs11Slot) {
PK11_FreeSlot(pubKey->pkcs11Slot);
pubKey->pkcs11Slot = NULL;
pubKey->pkcs11ID = CK_INVALID_KEY;
}
}
}
if (privKey == NULL) goto rsa_failed;
if (pubKey == NULL) goto rsa_failed;
wrapData.len = SECKEY_PublicKeyStrength(pubKey);
if (!wrapData.len) goto rsa_failed;
wrapData.data = PORT_Alloc(wrapData.len);
if (wrapData.data == NULL) goto rsa_failed;
/* now wrap the keys in and out */
rv = PK11_PubWrapSymKey(CKM_RSA_PKCS, pubKey, symKey, &wrapData);
if (rv == SECSuccess) {
newSymKey = PK11_PubUnwrapSymKey(privKey,&wrapData,type,operation,
symKey->size);
}
rsa_failed:
if (wrapData.data != NULL) PORT_Free(wrapData.data);
if (privKey != NULL) SECKEY_DestroyPrivateKey(privKey);
if (pubKey != NULL) SECKEY_DestroyPublicKey(pubKey);
return newSymKey;
}
/* KEA */
if (PK11_DoesMechanism(symKey->slot, CKM_KEA_KEY_DERIVE) &&
PK11_DoesMechanism(slot,CKM_KEA_KEY_DERIVE)) {
CERTCertificate *certSource = NULL;
CERTCertificate *certTarget = NULL;
SECKEYPublicKey *pubKeySource = NULL;
SECKEYPublicKey *pubKeyTarget = NULL;
SECKEYPrivateKey *privKeySource = NULL;
SECKEYPrivateKey *privKeyTarget = NULL;
PK11SymKey *tekSource = NULL;
PK11SymKey *tekTarget = NULL;
SECItem Ra,wrap;
/* can only exchange skipjack keys */
if (type != CKM_SKIPJACK_CBC64) {
PORT_SetError( SEC_ERROR_NO_MODULE );
goto kea_failed;
}
/* find a pair of certs we can use */
rv = PK11_GetKEAMatchedCerts(symKey->slot,slot,&certSource,&certTarget);
if (rv != SECSuccess) goto kea_failed;
/* get all the key pairs */
pubKeyTarget = CERT_ExtractPublicKey(certSource);
pubKeySource = CERT_ExtractPublicKey(certTarget);
privKeySource =
PK11_FindKeyByDERCert(symKey->slot,certSource,symKey->cx);
privKeyTarget =
PK11_FindKeyByDERCert(slot,certTarget,symKey->cx);
if ((pubKeySource == NULL) || (pubKeyTarget == NULL) ||
(privKeySource == NULL) || (privKeyTarget == NULL)) goto kea_failed;
/* generate the wrapping TEK's */
Ra.data = (unsigned char*)PORT_Alloc(128 /* FORTEZZA RA MAGIC */);
Ra.len = 128;
if (Ra.data == NULL) goto kea_failed;
tekSource = PK11_PubDerive(privKeySource,pubKeyTarget,PR_TRUE,&Ra,NULL,
CKM_SKIPJACK_WRAP, CKM_KEA_KEY_DERIVE,CKA_WRAP,0,symKey->cx);
tekTarget = PK11_PubDerive(privKeyTarget,pubKeySource,PR_FALSE,&Ra,NULL,
CKM_SKIPJACK_WRAP, CKM_KEA_KEY_DERIVE,CKA_WRAP,0,symKey->cx);
PORT_Free(Ra.data);
if ((tekSource == NULL) || (tekTarget == NULL)) { goto kea_failed; }
/* wrap the key out of Source into target */
wrap.data = (unsigned char*)PORT_Alloc(12); /* MAGIC SKIPJACK LEN */
wrap.len = 12;
/* paranoia to prevent infinite recursion on bugs */
PORT_Assert(tekSource->slot == symKey->slot);
if (tekSource->slot != symKey->slot) {
PORT_SetError( SEC_ERROR_NO_MODULE );
goto kea_failed;
}
rv = PK11_WrapSymKey(CKM_SKIPJACK_WRAP,NULL,tekSource,symKey,&wrap);
if (rv == SECSuccess) {
newSymKey = PK11_UnwrapSymKey(tekTarget, CKM_SKIPJACK_WRAP, NULL,
&wrap, type, operation, symKey->size);
}
PORT_Free(wrap.data);
kea_failed:
if (certSource == NULL) CERT_DestroyCertificate(certSource);
if (certTarget == NULL) CERT_DestroyCertificate(certTarget);
if (pubKeySource == NULL) SECKEY_DestroyPublicKey(pubKeySource);
if (pubKeyTarget == NULL) SECKEY_DestroyPublicKey(pubKeyTarget);
if (privKeySource == NULL) SECKEY_DestroyPrivateKey(privKeySource);
if (privKeyTarget == NULL) SECKEY_DestroyPrivateKey(privKeyTarget);
if (tekSource == NULL) PK11_FreeSymKey(tekSource);
if (tekTarget == NULL) PK11_FreeSymKey(tekTarget);
return newSymKey;
}
PORT_SetError( SEC_ERROR_NO_MODULE );
return NULL;
}
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