mirror of
https://github.com/rn10950/RetroZilla.git
synced 2024-11-13 03:10:10 +01:00
378 lines
9.8 KiB
C
378 lines
9.8 KiB
C
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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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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SEC_ASN1_MKSUB(SECOID_AlgorithmIDTemplate)
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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 | SEC_ASN1_XTRN, offsetof(SDRResult, alg),
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SEC_ASN1_SUB(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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static unsigned char keyID[] = {
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0xF8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01
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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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unsigned int i;
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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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/* verify padding */
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for (i=data->len - padLength; i < data->len; i++) {
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if (data->data[i] != padLength) {
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rv = SECFailure;
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goto loser;
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}
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}
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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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if (padLength < 2) {
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return SECWouldBlock;
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}
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loser:
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return rv;
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}
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static PRLock *pk11sdrLock = NULL;
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void
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pk11sdr_Init (void)
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{
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pk11sdrLock = PR_NewLock();
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}
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void
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pk11sdr_Shutdown(void)
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{
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if (pk11sdrLock) {
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PR_DestroyLock(pk11sdrLock);
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pk11sdrLock = NULL;
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}
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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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SECItem *pKeyID;
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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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/*
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* Login to the internal token before we look for the key, otherwise we
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* won't find it.
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*/
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rv = PK11_Authenticate(slot, PR_TRUE, cx);
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if (rv != SECSuccess) goto loser;
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/* Find the key to use */
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pKeyID = keyid;
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if (pKeyID->len == 0) {
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pKeyID = &keyIDItem; /* Use default value */
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/* put in a course lock to prevent a race between not finding the
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* key and creating one.
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*/
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if (pk11sdrLock) PR_Lock(pk11sdrLock);
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/* Try to find the key */
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key = PK11_FindFixedKey(slot, type, pKeyID, cx);
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/* If the default key doesn't exist yet, try to create it */
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if (!key) key = PK11_GenDES3TokenKey(slot, pKeyID, cx);
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if (pk11sdrLock) PR_Unlock(pk11sdrLock);
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} else {
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key = PK11_FindFixedKey(slot, type, pKeyID, cx);
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}
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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, (int*)&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 = *pKeyID;
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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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if (arena) PORT_FreeArena(arena, PR_TRUE);
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if (ctx) PK11_DestroyContext(ctx, PR_TRUE);
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if (params) SECITEM_ZfreeItem(params, PR_TRUE);
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if (key) PK11_FreeSymKey(key);
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if (slot) PK11_FreeSlot(slot);
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return rv;
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}
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/* decrypt a block */
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static SECStatus
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pk11Decrypt(PK11SlotInfo *slot, PLArenaPool *arena,
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CK_MECHANISM_TYPE type, PK11SymKey *key,
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SECItem *params, SECItem *in, SECItem *result)
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{
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PK11Context *ctx = 0;
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SECItem paddedResult;
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SECStatus rv;
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paddedResult.len = 0;
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paddedResult.data = 0;
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ctx = PK11_CreateContextBySymKey(type, CKA_DECRYPT, key, params);
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if (!ctx) { rv = SECFailure; goto loser; }
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paddedResult.len = in->len;
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paddedResult.data = PORT_ArenaAlloc(arena, paddedResult.len);
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rv = PK11_CipherOp(ctx, paddedResult.data,
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(int*)&paddedResult.len, paddedResult.len,
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in->data, in->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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if (ctx) PK11_DestroyContext(ctx, PR_TRUE);
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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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CK_MECHANISM_TYPE type;
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SDRResult sdrResult;
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SECItem *params = 0;
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SECItem possibleResult = { 0, NULL, 0 };
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PLArenaPool *arena = 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_QuickDERDecodeItem(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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rv = PK11_Authenticate(slot, PR_TRUE, cx);
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if (rv != SECSuccess) 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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/* Use triple-DES (Should look up the algorithm) */
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type = CKM_DES3_CBC;
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key = PK11_FindFixedKey(slot, type, &sdrResult.keyid, cx);
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if (!key) {
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rv = SECFailure;
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} else {
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rv = pk11Decrypt(slot, arena, type, key, params,
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&sdrResult.data, result);
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}
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/*
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* if the pad value was too small (1 or 2), then it's statistically
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* 'likely' that (1 in 256) that we may not have the correct key.
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* Check the other keys for a better match. If we find none, use
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* this result.
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*/
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if (rv == SECWouldBlock) {
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possibleResult = *result;
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}
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/*
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* handle the case where your key indicies may have been broken
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*/
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if (rv != SECSuccess) {
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PK11SymKey *keyList = PK11_ListFixedKeysInSlot(slot, NULL, cx);
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PK11SymKey *testKey = NULL;
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PK11SymKey *nextKey = NULL;
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for (testKey = keyList; testKey;
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testKey = PK11_GetNextSymKey(testKey)) {
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rv = pk11Decrypt(slot, arena, type, testKey, params,
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&sdrResult.data, result);
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if (rv == SECSuccess) {
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break;
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}
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/* found a close match. If it's our first remember it */
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if (rv == SECWouldBlock) {
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if (possibleResult.data) {
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/* this is unlikely but possible. If we hit this condition,
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* we have no way of knowing which possibility to prefer.
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* in this case we just match the key the application
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* thought was the right one */
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SECITEM_ZfreeItem(result, PR_FALSE);
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} else {
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possibleResult = *result;
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}
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}
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}
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/* free the list */
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for (testKey = keyList; testKey; testKey = nextKey) {
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nextKey = PK11_GetNextSymKey(testKey);
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PK11_FreeSymKey(testKey);
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}
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}
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/* we didn't find a better key, use the one with a small pad value */
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if ((rv != SECSuccess) && (possibleResult.data)) {
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*result = possibleResult;
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possibleResult.data = NULL;
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rv = SECSuccess;
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}
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loser:
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if (arena) PORT_FreeArena(arena, PR_TRUE);
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if (key) PK11_FreeSymKey(key);
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if (params) SECITEM_ZfreeItem(params, PR_TRUE);
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if (slot) PK11_FreeSlot(slot);
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if (possibleResult.data) SECITEM_ZfreeItem(&possibleResult, PR_FALSE);
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return rv;
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}
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