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293 lines
8.4 KiB
C
293 lines
8.4 KiB
C
/*
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* The contents of this file are subject to the Mozilla Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the 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 Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1994-2000 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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* thayes@netscape.com
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*
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* Alternatively, the contents of this file may be used under the
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* terms of the GNU General Public License Version 2 or later (the
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* "GPL"), in which case the provisions of the GPL are applicable
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* instead of those above. If you wish to allow use of your
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* version of this file only under the terms of the GPL and not to
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* allow others to use your version of this file under the MPL,
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* indicate your decision by deleting the provisions above and
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* replace them with the notice and other provisions required by
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* the GPL. If you do not delete the provisions above, a recipient
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* may use your version of this file under either the MPL or the
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* GPL.
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*
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* PKCS #11 Wrapper functions which handles authenticating to the card's
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* choosing the best cards, etc.
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*/
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#include "seccomon.h"
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#include "secoid.h"
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#include "secasn1.h"
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#include "pkcs11.h"
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#include "pk11func.h"
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#include "pk11sdr.h"
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/*
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* Data structure and template for encoding the result of an SDR operation
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* This is temporary. It should include the algorithm ID of the encryption mechanism
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*/
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struct SDRResult
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{
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SECItem keyid;
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SECAlgorithmID alg;
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SECItem data;
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};
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typedef struct SDRResult SDRResult;
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static SEC_ASN1Template template[] = {
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{ SEC_ASN1_SEQUENCE, 0, NULL, sizeof (SDRResult) },
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{ SEC_ASN1_OCTET_STRING, offsetof(SDRResult, keyid) },
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{ SEC_ASN1_INLINE, offsetof(SDRResult, alg), SECOID_AlgorithmIDTemplate },
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{ SEC_ASN1_OCTET_STRING, offsetof(SDRResult, data) },
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{ 0 }
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};
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/*
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* Temporary fixed DES3 key for testing
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*/
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static unsigned char keyValue[] = {
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0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
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0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
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0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17
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};
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static SECItem keyItem = {
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0,
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keyValue,
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sizeof keyValue
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};
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static unsigned char keyID[] = {
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
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};
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static SECItem keyIDItem = {
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0,
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keyID,
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sizeof keyID
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};
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/* local utility function for padding an incoming data block
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* to the mechanism block size.
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*/
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static SECStatus
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padBlock(SECItem *data, int blockSize, SECItem *result)
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{
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SECStatus rv = SECSuccess;
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int padLength;
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unsigned int i;
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result->data = 0;
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result->len = 0;
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/* This algorithm always adds to the block (to indicate the number
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* of pad bytes). So allocate a block large enough.
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*/
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padLength = blockSize - (data->len % blockSize);
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result->len = data->len + padLength;
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result->data = (unsigned char *)PORT_Alloc(result->len);
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/* Copy the data */
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PORT_Memcpy(result->data, data->data, data->len);
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/* Add the pad values */
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for(i = data->len; i < result->len; i++)
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result->data[i] = (unsigned char)padLength;
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return rv;
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}
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static SECStatus
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unpadBlock(SECItem *data, int blockSize, SECItem *result)
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{
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SECStatus rv = SECSuccess;
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int padLength;
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result->data = 0;
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result->len = 0;
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/* Remove the padding from the end if the input data */
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if (data->len == 0 || data->len % blockSize != 0) { rv = SECFailure; goto loser; }
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padLength = data->data[data->len-1];
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if (padLength > blockSize) { rv = SECFailure; goto loser; }
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result->len = data->len - padLength;
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result->data = (unsigned char *)PORT_Alloc(result->len);
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if (!result->data) { rv = SECFailure; goto loser; }
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PORT_Memcpy(result->data, data->data, result->len);
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loser:
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return rv;
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}
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/*
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* PK11SDR_Encrypt
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* Encrypt a block of data using the symmetric key identified. The result
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* is an ASN.1 (DER) encoded block of keyid, params and data.
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*/
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SECStatus
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PK11SDR_Encrypt(SECItem *keyid, SECItem *data, SECItem *result, void *cx)
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{
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SECStatus rv = SECSuccess;
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PK11SlotInfo *slot = 0;
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PK11SymKey *key = 0;
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SECItem *params = 0;
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PK11Context *ctx = 0;
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CK_MECHANISM_TYPE type;
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SDRResult sdrResult;
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SECItem paddedData;
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PLArenaPool *arena = 0;
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/* Initialize */
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paddedData.len = 0;
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paddedData.data = 0;
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arena = PORT_NewArena(SEC_ASN1_DEFAULT_ARENA_SIZE);
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if (!arena) { rv = SECFailure; goto loser; }
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/* 1. Locate the requested keyid, or the default key (which has a keyid)
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* 2. Create an encryption context
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* 3. Encrypt
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* 4. Encode the results (using ASN.1)
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*/
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slot = PK11_GetInternalKeySlot();
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if (!slot) { rv = SECFailure; goto loser; }
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/* Use triple-DES */
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type = CKM_DES3_CBC;
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/* Keyid value 16*0 (16 bytes of 0) is special, it uses a fixed DES3 key */
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key = PK11_ImportSymKey(slot, type, 0, CKA_ENCRYPT, &keyItem, cx);
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if (!key) { rv = SECFailure; goto loser; }
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params = PK11_GenerateNewParam(type, key);
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if (!params) { rv = SECFailure; goto loser; }
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ctx = PK11_CreateContextBySymKey(type, CKA_ENCRYPT, key, params);
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if (!ctx) { rv = SECFailure; goto loser; }
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rv = padBlock(data, PK11_GetBlockSize(type, 0), &paddedData);
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if (rv != SECSuccess) goto loser;
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sdrResult.data.len = paddedData.len;
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sdrResult.data.data = (unsigned char *)PORT_ArenaAlloc(arena, sdrResult.data.len);
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rv = PK11_CipherOp(ctx, sdrResult.data.data, &sdrResult.data.len, sdrResult.data.len,
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paddedData.data, paddedData.len);
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if (rv != SECSuccess) goto loser;
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PK11_Finalize(ctx);
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sdrResult.keyid = keyIDItem;
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rv = PK11_ParamToAlgid(SEC_OID_DES_EDE3_CBC, params, arena, &sdrResult.alg);
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if (rv != SECSuccess) goto loser;
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if (!SEC_ASN1EncodeItem(0, result, &sdrResult, template)) { rv = SECFailure; goto loser; }
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loser:
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SECITEM_ZfreeItem(&paddedData, PR_FALSE);
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PORT_FreeArena(arena, PR_TRUE);
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PK11_DestroyContext(ctx, PR_TRUE);
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SECITEM_ZfreeItem(params, PR_TRUE);
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PK11_FreeSymKey(key);
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PK11_FreeSlot(slot);
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return rv;
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}
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/*
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* PK11SDR_Decrypt
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* Decrypt a block of data produced by PK11SDR_Encrypt. The key used is identified
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* by the keyid field within the input.
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*/
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SECStatus
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PK11SDR_Decrypt(SECItem *data, SECItem *result, void *cx)
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{
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SECStatus rv = SECSuccess;
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PK11SlotInfo *slot = 0;
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PK11SymKey *key = 0;
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PK11Context *ctx = 0;
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CK_MECHANISM_TYPE type;
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SDRResult sdrResult;
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SECItem *params = 0;
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SECItem paddedResult;
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PLArenaPool *arena = 0;
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paddedResult.len = 0;
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paddedResult.data = 0;
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arena = PORT_NewArena(SEC_ASN1_DEFAULT_ARENA_SIZE);
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if (!arena) { rv = SECFailure; goto loser; }
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/* Decode the incoming data */
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memset(&sdrResult, 0, sizeof sdrResult);
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rv = SEC_ASN1DecodeItem(arena, &sdrResult, template, data);
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if (rv != SECSuccess) goto loser; /* Invalid format */
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/* Find the slot and key for the given keyid */
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slot = PK11_GetInternalKeySlot();
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if (!slot) { rv = SECFailure; goto loser; }
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/* Use triple-DES (Should look up the algorithm) */
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type = CKM_DES3_CBC;
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/* Keyid value 16*0 (16 bytes of 0) is special, it uses a fixed DES3 key */
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key = PK11_ImportSymKey(slot, type, 0, CKA_DECRYPT, &keyItem, cx);
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if (!key) { rv = SECFailure; goto loser; }
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/* Get the parameter values from the data */
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params = PK11_ParamFromAlgid(&sdrResult.alg);
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if (!params) { rv = SECFailure; goto loser; }
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ctx = PK11_CreateContextBySymKey(type, CKA_ENCRYPT, key, params);
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if (!ctx) { rv = SECFailure; goto loser; }
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paddedResult.len = sdrResult.data.len;
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paddedResult.data = PORT_ArenaAlloc(arena, result->len);
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rv = PK11_CipherOp(ctx, paddedResult.data, &paddedResult.len, paddedResult.len,
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sdrResult.data.data, sdrResult.data.len);
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if (rv != SECSuccess) goto loser;
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PK11_Finalize(ctx);
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/* Remove the padding */
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rv = unpadBlock(&paddedResult, PK11_GetBlockSize(type, 0), result);
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if (rv) goto loser;
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loser:
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SECITEM_ZfreeItem(&paddedResult, PR_FALSE);
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PORT_FreeArena(arena, PR_TRUE);
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PK11_DestroyContext(ctx, PR_TRUE);
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PK11_FreeSymKey(key);
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SECITEM_ZfreeItem(params, PR_TRUE);
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PK11_FreeSlot(slot);
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return rv;
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}
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