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281 lines
7.9 KiB
C
281 lines
7.9 KiB
C
/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is the Netscape security libraries.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1994-2000
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/*
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* CMS encryptedData methods.
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*
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* $Id: cmsencdata.c,v 1.8 2005/10/03 22:01:57 relyea%netscape.com Exp $
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*/
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#include "cmslocal.h"
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#include "key.h"
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#include "secasn1.h"
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#include "secitem.h"
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#include "secoid.h"
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#include "pk11func.h"
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#include "prtime.h"
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#include "secerr.h"
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#include "secpkcs5.h"
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/*
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* NSS_CMSEncryptedData_Create - create an empty encryptedData object.
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*
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* "algorithm" specifies the bulk encryption algorithm to use.
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* "keysize" is the key size.
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*
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* An error results in a return value of NULL and an error set.
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* (Retrieve specific errors via PORT_GetError()/XP_GetError().)
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*/
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NSSCMSEncryptedData *
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NSS_CMSEncryptedData_Create(NSSCMSMessage *cmsg, SECOidTag algorithm, int keysize)
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{
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void *mark;
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NSSCMSEncryptedData *encd;
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PLArenaPool *poolp;
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SECAlgorithmID *pbe_algid;
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SECStatus rv;
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poolp = cmsg->poolp;
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mark = PORT_ArenaMark(poolp);
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encd = (NSSCMSEncryptedData *)PORT_ArenaZAlloc(poolp, sizeof(NSSCMSEncryptedData));
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if (encd == NULL)
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goto loser;
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encd->cmsg = cmsg;
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/* version is set in NSS_CMSEncryptedData_Encode_BeforeStart() */
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switch (algorithm) {
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/* XXX hmmm... hardcoded algorithms? */
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case SEC_OID_RC2_CBC:
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case SEC_OID_DES_EDE3_CBC:
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case SEC_OID_DES_CBC:
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rv = NSS_CMSContentInfo_SetContentEncAlg(poolp, &(encd->contentInfo), algorithm, NULL, keysize);
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break;
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default:
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/* Assume password-based-encryption. At least, try that. */
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pbe_algid = PK11_CreatePBEAlgorithmID(algorithm, 1, NULL);
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if (pbe_algid == NULL) {
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rv = SECFailure;
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break;
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}
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rv = NSS_CMSContentInfo_SetContentEncAlgID(poolp, &(encd->contentInfo), pbe_algid, keysize);
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SECOID_DestroyAlgorithmID (pbe_algid, PR_TRUE);
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break;
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}
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if (rv != SECSuccess)
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goto loser;
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PORT_ArenaUnmark(poolp, mark);
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return encd;
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loser:
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PORT_ArenaRelease(poolp, mark);
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return NULL;
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}
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/*
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* NSS_CMSEncryptedData_Destroy - destroy an encryptedData object
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*/
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void
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NSS_CMSEncryptedData_Destroy(NSSCMSEncryptedData *encd)
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{
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/* everything's in a pool, so don't worry about the storage */
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NSS_CMSContentInfo_Destroy(&(encd->contentInfo));
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return;
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}
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/*
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* NSS_CMSEncryptedData_GetContentInfo - return pointer to encryptedData object's contentInfo
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*/
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NSSCMSContentInfo *
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NSS_CMSEncryptedData_GetContentInfo(NSSCMSEncryptedData *encd)
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{
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return &(encd->contentInfo);
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}
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/*
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* NSS_CMSEncryptedData_Encode_BeforeStart - do all the necessary things to a EncryptedData
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* before encoding begins.
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*
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* In particular:
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* - set the correct version value.
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* - get the encryption key
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*/
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SECStatus
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NSS_CMSEncryptedData_Encode_BeforeStart(NSSCMSEncryptedData *encd)
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{
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int version;
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PK11SymKey *bulkkey = NULL;
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SECItem *dummy;
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NSSCMSContentInfo *cinfo = &(encd->contentInfo);
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if (NSS_CMSArray_IsEmpty((void **)encd->unprotectedAttr))
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version = NSS_CMS_ENCRYPTED_DATA_VERSION;
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else
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version = NSS_CMS_ENCRYPTED_DATA_VERSION_UPATTR;
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dummy = SEC_ASN1EncodeInteger (encd->cmsg->poolp, &(encd->version), version);
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if (dummy == NULL)
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return SECFailure;
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/* now get content encryption key (bulk key) by using our cmsg callback */
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if (encd->cmsg->decrypt_key_cb)
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bulkkey = (*encd->cmsg->decrypt_key_cb)(encd->cmsg->decrypt_key_cb_arg,
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NSS_CMSContentInfo_GetContentEncAlg(cinfo));
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if (bulkkey == NULL)
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return SECFailure;
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/* store the bulk key in the contentInfo so that the encoder can find it */
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NSS_CMSContentInfo_SetBulkKey(cinfo, bulkkey);
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PK11_FreeSymKey (bulkkey);
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return SECSuccess;
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}
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/*
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* NSS_CMSEncryptedData_Encode_BeforeData - set up encryption
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*/
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SECStatus
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NSS_CMSEncryptedData_Encode_BeforeData(NSSCMSEncryptedData *encd)
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{
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NSSCMSContentInfo *cinfo;
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PK11SymKey *bulkkey;
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SECAlgorithmID *algid;
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cinfo = &(encd->contentInfo);
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/* find bulkkey and algorithm - must have been set by NSS_CMSEncryptedData_Encode_BeforeStart */
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bulkkey = NSS_CMSContentInfo_GetBulkKey(cinfo);
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if (bulkkey == NULL)
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return SECFailure;
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algid = NSS_CMSContentInfo_GetContentEncAlg(cinfo);
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if (algid == NULL)
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return SECFailure;
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/* this may modify algid (with IVs generated in a token).
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* it is therefore essential that algid is a pointer to the "real" contentEncAlg,
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* not just to a copy */
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cinfo->ciphcx = NSS_CMSCipherContext_StartEncrypt(encd->cmsg->poolp, bulkkey, algid);
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PK11_FreeSymKey(bulkkey);
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if (cinfo->ciphcx == NULL)
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return SECFailure;
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return SECSuccess;
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}
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/*
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* NSS_CMSEncryptedData_Encode_AfterData - finalize this encryptedData for encoding
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*/
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SECStatus
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NSS_CMSEncryptedData_Encode_AfterData(NSSCMSEncryptedData *encd)
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{
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if (encd->contentInfo.ciphcx) {
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NSS_CMSCipherContext_Destroy(encd->contentInfo.ciphcx);
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encd->contentInfo.ciphcx = NULL;
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}
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/* nothing to do after data */
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return SECSuccess;
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}
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/*
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* NSS_CMSEncryptedData_Decode_BeforeData - find bulk key & set up decryption
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*/
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SECStatus
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NSS_CMSEncryptedData_Decode_BeforeData(NSSCMSEncryptedData *encd)
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{
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PK11SymKey *bulkkey = NULL;
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NSSCMSContentInfo *cinfo;
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SECAlgorithmID *bulkalg;
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SECStatus rv = SECFailure;
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cinfo = &(encd->contentInfo);
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bulkalg = NSS_CMSContentInfo_GetContentEncAlg(cinfo);
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if (encd->cmsg->decrypt_key_cb == NULL) /* no callback? no key../ */
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goto loser;
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bulkkey = (*encd->cmsg->decrypt_key_cb)(encd->cmsg->decrypt_key_cb_arg, bulkalg);
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if (bulkkey == NULL)
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/* no success finding a bulk key */
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goto loser;
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NSS_CMSContentInfo_SetBulkKey(cinfo, bulkkey);
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cinfo->ciphcx = NSS_CMSCipherContext_StartDecrypt(bulkkey, bulkalg);
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if (cinfo->ciphcx == NULL)
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goto loser; /* error has been set by NSS_CMSCipherContext_StartDecrypt */
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/* we are done with (this) bulkkey now. */
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PK11_FreeSymKey(bulkkey);
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rv = SECSuccess;
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loser:
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return rv;
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}
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/*
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* NSS_CMSEncryptedData_Decode_AfterData - finish decrypting this encryptedData's content
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*/
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SECStatus
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NSS_CMSEncryptedData_Decode_AfterData(NSSCMSEncryptedData *encd)
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{
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if (encd->contentInfo.ciphcx) {
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NSS_CMSCipherContext_Destroy(encd->contentInfo.ciphcx);
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encd->contentInfo.ciphcx = NULL;
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}
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return SECSuccess;
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}
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/*
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* NSS_CMSEncryptedData_Decode_AfterEnd - finish decoding this encryptedData
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*/
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SECStatus
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NSS_CMSEncryptedData_Decode_AfterEnd(NSSCMSEncryptedData *encd)
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{
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/* apply final touches */
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return SECSuccess;
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}
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