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/* This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ # include "seccomon.h" # include "secoid.h" # include "secasn1.h" # include "pkcs11.h" # include "pk11func.h" # include "pk11sdr.h" /* * Data structure and template for encoding the result of an SDR operation * This is temporary. It should include the algorithm ID of the encryption mechanism */ struct SDRResult { SECItem keyid; SECAlgorithmID alg; SECItem data; }; typedef struct SDRResult SDRResult; SEC_ASN1_MKSUB(SECOID_AlgorithmIDTemplate) static SEC_ASN1Template template[] = { { SEC_ASN1_SEQUENCE, 0, NULL, sizeof (SDRResult) }, { SEC_ASN1_OCTET_STRING, offsetof(SDRResult, keyid) }, { SEC_ASN1_INLINE | SEC_ASN1_XTRN, offsetof(SDRResult, alg), SEC_ASN1_SUB(SECOID_AlgorithmIDTemplate) }, { SEC_ASN1_OCTET_STRING, offsetof(SDRResult, data) }, { 0 } }; static unsigned char keyID[] = { 0xF8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01 }; static SECItem keyIDItem = { 0, keyID, sizeof keyID }; /* local utility function for padding an incoming data block * to the mechanism block size. */ static SECStatus padBlock(SECItem *data, int blockSize, SECItem *result) { SECStatus rv = SECSuccess; int padLength; unsigned int i; result->data = 0; result->len = 0; /* This algorithm always adds to the block (to indicate the number * of pad bytes). So allocate a block large enough. */ padLength = blockSize - (data->len % blockSize); result->len = data->len + padLength; result->data = ( unsigned char *)PORT_Alloc(result->len); /* Copy the data */ PORT_Memcpy(result->data, data->data, data->len); /* Add the pad values */ for (i = data->len; i < result->len; i++) result->data[i] = ( unsigned char )padLength; return rv; } static SECStatus unpadBlock(SECItem *data, int blockSize, SECItem *result) { SECStatus rv = SECSuccess; int padLength; unsigned int i; result->data = 0; result->len = 0; /* Remove the padding from the end if the input data */ if (data->len == 0 || data->len % blockSize != 0) { rv = SECFailure; goto loser; } padLength = data->data[data->len - 1]; if (padLength > blockSize) { rv = SECFailure; goto loser; } /* verify padding */ for (i = data->len - padLength; i < data->len; i++) { if (data->data[i] != padLength) { rv = SECFailure; goto loser; } } result->len = data->len - padLength; result->data = ( unsigned char *)PORT_Alloc(result->len); if (!result->data) { rv = SECFailure; goto loser; } PORT_Memcpy(result->data, data->data, result->len); if (padLength < 2) { return SECWouldBlock; } loser: return rv; } static PRLock *pk11sdrLock = NULL; void pk11sdr_Init( void ) { pk11sdrLock = PR_NewLock(); } void pk11sdr_Shutdown( void ) { if (pk11sdrLock) { PR_DestroyLock(pk11sdrLock); pk11sdrLock = NULL; } } /* * PK11SDR_Encrypt * Encrypt a block of data using the symmetric key identified. The result * is an ASN.1 (DER) encoded block of keyid, params and data. */ SECStatus PK11SDR_Encrypt(SECItem *keyid, SECItem *data, SECItem *result, void *cx) { SECStatus rv = SECSuccess; PK11SlotInfo *slot = 0; PK11SymKey *key = 0; SECItem *params = 0; PK11Context *ctx = 0; CK_MECHANISM_TYPE type; SDRResult sdrResult; SECItem paddedData; SECItem *pKeyID; PLArenaPool *arena = 0; /* Initialize */ paddedData.len = 0; paddedData.data = 0; arena = PORT_NewArena(SEC_ASN1_DEFAULT_ARENA_SIZE); if (!arena) { rv = SECFailure; goto loser; } /* 1. Locate the requested keyid, or the default key (which has a keyid) * 2. Create an encryption context * 3. Encrypt * 4. Encode the results (using ASN.1) */ slot = PK11_GetInternalKeySlot(); if (!slot) { rv = SECFailure; goto loser; } /* Use triple-DES */ type = CKM_DES3_CBC; /* * Login to the internal token before we look for the key, otherwise we * won't find it. */ rv = PK11_Authenticate(slot, PR_TRUE, cx); if (rv != SECSuccess) goto loser; /* Find the key to use */ pKeyID = keyid; if (pKeyID->len == 0) { pKeyID = &keyIDItem; /* Use default value */ /* put in a course lock to prevent a race between not finding the * key and creating one. */ if (pk11sdrLock) PR_Lock(pk11sdrLock); /* Try to find the key */ key = PK11_FindFixedKey(slot, type, pKeyID, cx); /* If the default key doesn't exist yet, try to create it */ if (!key) key = PK11_GenDES3TokenKey(slot, pKeyID, cx); if (pk11sdrLock) PR_Unlock(pk11sdrLock); } else { key = PK11_FindFixedKey(slot, type, pKeyID, cx); } if (!key) { rv = SECFailure; goto loser; } params = PK11_GenerateNewParam(type, key); if (!params) { rv = SECFailure; goto loser; } ctx = PK11_CreateContextBySymKey(type, CKA_ENCRYPT, key, params); if (!ctx) { rv = SECFailure; goto loser; } rv = padBlock(data, PK11_GetBlockSize(type, 0), &paddedData); if (rv != SECSuccess) goto loser; sdrResult.data.len = paddedData.len; sdrResult.data.data = ( unsigned char *)PORT_ArenaAlloc(arena, sdrResult.data.len); rv = PK11_CipherOp(ctx, sdrResult.data.data, ( int *)&sdrResult.data.len, sdrResult.data.len, paddedData.data, paddedData.len); if (rv != SECSuccess) goto loser; PK11_Finalize(ctx); sdrResult.keyid = *pKeyID; rv = PK11_ParamToAlgid(SEC_OID_DES_EDE3_CBC, params, arena, &sdrResult.alg); if (rv != SECSuccess) goto loser; if (!SEC_ASN1EncodeItem(0, result, &sdrResult, template)) { rv = SECFailure; goto loser; } loser: SECITEM_ZfreeItem(&paddedData, PR_FALSE); if (arena) PORT_FreeArena(arena, PR_TRUE); if (ctx) PK11_DestroyContext(ctx, PR_TRUE); if (params) SECITEM_ZfreeItem(params, PR_TRUE); if (key) PK11_FreeSymKey(key); if (slot) PK11_FreeSlot(slot); return rv; } /* decrypt a block */ static SECStatus pk11Decrypt(PK11SlotInfo *slot, PLArenaPool *arena, CK_MECHANISM_TYPE type, PK11SymKey *key, SECItem *params, SECItem *in, SECItem *result) { PK11Context *ctx = 0; SECItem paddedResult; SECStatus rv; paddedResult.len = 0; paddedResult.data = 0; ctx = PK11_CreateContextBySymKey(type, CKA_DECRYPT, key, params); if (!ctx) { rv = SECFailure; goto loser; } paddedResult.len = in->len; paddedResult.data = PORT_ArenaAlloc(arena, paddedResult.len); rv = PK11_CipherOp(ctx, paddedResult.data, ( int *)&paddedResult.len, paddedResult.len, in->data, in->len); if (rv != SECSuccess) goto loser; PK11_Finalize(ctx); /* Remove the padding */ rv = unpadBlock(&paddedResult, PK11_GetBlockSize(type, 0), result); if (rv) goto loser; loser: if (ctx) PK11_DestroyContext(ctx, PR_TRUE); return rv; } /* * PK11SDR_Decrypt * Decrypt a block of data produced by PK11SDR_Encrypt. The key used is identified * by the keyid field within the input. */ SECStatus PK11SDR_Decrypt(SECItem *data, SECItem *result, void *cx) { SECStatus rv = SECSuccess; PK11SlotInfo *slot = 0; PK11SymKey *key = 0; CK_MECHANISM_TYPE type; SDRResult sdrResult; SECItem *params = 0; SECItem possibleResult = { 0, NULL, 0 }; PLArenaPool *arena = 0; arena = PORT_NewArena(SEC_ASN1_DEFAULT_ARENA_SIZE); if (!arena) { rv = SECFailure; goto loser; } /* Decode the incoming data */ memset(&sdrResult, 0, sizeof sdrResult); rv = SEC_QuickDERDecodeItem(arena, &sdrResult, template, data); if (rv != SECSuccess) goto loser; /* Invalid format */ /* Find the slot and key for the given keyid */ slot = PK11_GetInternalKeySlot(); if (!slot) { rv = SECFailure; goto loser; } rv = PK11_Authenticate(slot, PR_TRUE, cx); if (rv != SECSuccess) goto loser; /* Get the parameter values from the data */ params = PK11_ParamFromAlgid(&sdrResult.alg); if (!params) { rv = SECFailure; goto loser; } /* Use triple-DES (Should look up the algorithm) */ type = CKM_DES3_CBC; key = PK11_FindFixedKey(slot, type, &sdrResult.keyid, cx); if (!key) { rv = SECFailure; } else { rv = pk11Decrypt(slot, arena, type, key, params, &sdrResult.data, result); } /* * if the pad value was too small (1 or 2), then it's statistically * 'likely' that (1 in 256) that we may not have the correct key. * Check the other keys for a better match. If we find none, use * this result. */ if (rv == SECWouldBlock) { possibleResult = *result; } /* * handle the case where your key indicies may have been broken */ if (rv != SECSuccess) { PK11SymKey *keyList = PK11_ListFixedKeysInSlot(slot, NULL, cx); PK11SymKey *testKey = NULL; PK11SymKey *nextKey = NULL; for (testKey = keyList; testKey; testKey = PK11_GetNextSymKey(testKey)) { rv = pk11Decrypt(slot, arena, type, testKey, params, &sdrResult.data, result); if (rv == SECSuccess) { break ; } /* found a close match. If it's our first remember it */ if (rv == SECWouldBlock) { if (possibleResult.data) { /* this is unlikely but possible. If we hit this condition, * we have no way of knowing which possibility to prefer. * in this case we just match the key the application * thought was the right one */ SECITEM_ZfreeItem(result, PR_FALSE); } else { possibleResult = *result; } } } /* free the list */ for (testKey = keyList; testKey; testKey = nextKey) { nextKey = PK11_GetNextSymKey(testKey); PK11_FreeSymKey(testKey); } } /* we didn't find a better key, use the one with a small pad value */ if ((rv != SECSuccess) && (possibleResult.data)) { *result = possibleResult; possibleResult.data = NULL; rv = SECSuccess; } loser: if (arena) PORT_FreeArena(arena, PR_TRUE); if (key) PK11_FreeSymKey(key); if (params) SECITEM_ZfreeItem(params, PR_TRUE); if (slot) PK11_FreeSlot(slot); if (possibleResult.data) SECITEM_ZfreeItem(&possibleResult, PR_FALSE); return rv; }