/* 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/. */ /* * This file PK11Contexts which are used in multipart hashing, * encryption/decryption, and signing/verication operations.
*/
/********************************************************************** * * Now Deal with Crypto Contexts *
**********************************************************************/
/* * the monitors...
*/ void
PK11_EnterContextMonitor(PK11Context *cx)
{ /* if we own the session and our slot is ThreadSafe, only monitor
* the Context */ if ((cx->ownSession) && (cx->slot->isThreadSafe)) { /* Should this use monitors instead? */
PZ_Lock(cx->sessionLock);
} else {
PK11_EnterSlotMonitor(cx->slot);
}
}
void
PK11_ExitContextMonitor(PK11Context *cx)
{ /* if we own the session and our slot is ThreadSafe, only monitor
* the Context */ if ((cx->ownSession) && (cx->slot->isThreadSafe)) { /* Should this use monitors instead? */
PZ_Unlock(cx->sessionLock);
} else {
PK11_ExitSlotMonitor(cx->slot);
}
}
/* * Free up a Cipher Context
*/ void
PK11_DestroyContext(PK11Context *context, PRBool freeit)
{
pk11_CloseSession(context->slot, context->session, context->ownSession); /* initialize the critical fields of the context */ if (context->savedData != NULL)
PORT_Free(context->savedData); if (context->key)
PK11_FreeSymKey(context->key); if (context->param && context->param != &pk11_null_params)
SECITEM_FreeItem(context->param, PR_TRUE); if (context->sessionLock)
PZ_DestroyLock(context->sessionLock);
PK11_FreeSlot(context->slot); if (freeit)
PORT_Free(context);
}
/* * save the current context. Allocate Space if necessary.
*/ staticunsignedchar *
pk11_saveContextHelper(PK11Context *context, unsignedchar *buffer, unsignedlong *savedLength)
{
CK_RV crv;
/* If buffer is NULL, this will get the length */
crv = PK11_GETTAB(context->slot)->C_GetOperationState(context->session, (CK_BYTE_PTR)buffer, savedLength); if (!buffer || (crv == CKR_BUFFER_TOO_SMALL)) { /* the given buffer wasn't big enough (or was NULL), but we * have the length, so try again with a new buffer and the * correct length
*/ unsignedlong bufLen = *savedLength;
buffer = PORT_Alloc(bufLen); if (buffer == NULL) { return (unsignedchar *)NULL;
}
crv = PK11_GETTAB(context->slot)->C_GetOperationState(context->session, (CK_BYTE_PTR)buffer, savedLength); if (crv != CKR_OK) {
PORT_ZFree(buffer, bufLen);
}
} if (crv != CKR_OK) {
PORT_SetError(PK11_MapError(crv)); return (unsignedchar *)NULL;
} return buffer;
}
/* * Initialize a Message function. Particular function is passed in as a * function pointer. Since all C_Message*Init funcitons have the same * prototype, we just pick one of the the prototypes to declare our init * function.
*/ static CK_RV
pk11_contextInitMessage(PK11Context *context, CK_MECHANISM_PTR mech,
CK_C_MessageEncryptInit initFunc,
CK_FLAGS flags, CK_RV scrv)
{
PK11SlotInfo *slot = context->slot;
CK_VERSION version = slot->module->cryptokiVersion;
CK_RV crv = CKR_OK;
context->ivCounter = 0;
context->ivMaxCount = 0;
context->ivFixedBits = 0;
context->ivLen = 0;
context->ivGen = CKG_NO_GENERATE;
context->simulate_mechanism = (mech)->mechanism;
context->simulate_message = PR_FALSE; /* check that we can do the Message interface. We need to check * for either 1) are we using a PKCS #11 v3 interface and 2) is the * Message flag set on the mechanism. If either is false we simulate * the message interface for the Encrypt and Decrypt cases using the * PKCS #11 V2 interface. * Sign and verify do not have V2 interfaces, so we go ahead and fail
* if those cases */ if ((version.major >= 3) &&
PK11_DoesMechanismFlag(slot, (mech)->mechanism, flags)) {
PK11_EnterContextMonitor(context);
crv = (*initFunc)((context)->session, (mech), (context)->objectID);
PK11_ExitContextMonitor(context); if ((crv == CKR_FUNCTION_NOT_SUPPORTED) ||
(crv == CKR_MECHANISM_INVALID)) { /* we have a 3.0 interface, and the flag was set (or ignored)
* but the implementation was not there, use the V2 interface */
crv = (scrv);
context->simulate_message = PR_TRUE;
}
} else {
crv = (scrv);
context->simulate_message = PR_TRUE;
} return crv;
}
/* * Context initialization. Used by all flavors of CreateContext
*/ static SECStatus
pk11_context_init(PK11Context *context, CK_MECHANISM *mech_info)
{
CK_RV crv;
SECStatus rv = SECSuccess;
context->simulate_message = PR_FALSE; switch (context->operation) { case CKA_ENCRYPT:
PK11_EnterContextMonitor(context);
crv = PK11_GETTAB(context->slot)->C_EncryptInit(context->session, mech_info, context->objectID);
PK11_ExitContextMonitor(context); break; case CKA_DECRYPT:
PK11_EnterContextMonitor(context); if (context->fortezzaHack) {
CK_ULONG count = 0; /* generate the IV for fortezza */
crv = PK11_GETTAB(context->slot)->C_EncryptInit(context->session, mech_info, context->objectID); if (crv != CKR_OK) {
PK11_ExitContextMonitor(context); break;
}
PK11_GETTAB(context->slot)
->C_EncryptFinal(context->session,
NULL, &count);
}
crv = PK11_GETTAB(context->slot)->C_DecryptInit(context->session, mech_info, context->objectID);
PK11_ExitContextMonitor(context); break; case CKA_SIGN:
PK11_EnterContextMonitor(context);
crv = PK11_GETTAB(context->slot)->C_SignInit(context->session, mech_info, context->objectID);
PK11_ExitContextMonitor(context); break; case CKA_VERIFY: /* NOTE: we previously has this set to C_SignInit for Macing. * It turns out now one could possibly use it that way, though, * because PK11_HashOp() always called C_VerifyUpdate on CKA_VERIFY, * which would have failed. So everyone just calls us with CKA_SIGN * when Macing even when they are verifying, no need to 'do it * for them'. It needs to be VerifyInit now so that we can do
* PKCS #11 hash/Verify combo operations. */
PK11_EnterContextMonitor(context);
crv = PK11_GETTAB(context->slot)->C_VerifyInit(context->session, mech_info, context->objectID);
PK11_ExitContextMonitor(context); break; case CKA_DIGEST:
PK11_EnterContextMonitor(context);
crv = PK11_GETTAB(context->slot)->C_DigestInit(context->session, mech_info);
PK11_ExitContextMonitor(context); break;
if (crv != CKR_OK) {
PORT_SetError(PK11_MapError(crv)); return SECFailure;
}
/* handle the case where the token is using the old NSS mechanism */ if (context->simulate_message &&
!PK11_DoesMechanism(context->slot, context->simulate_mechanism)) { if ((context->simulate_mechanism == CKM_CHACHA20_POLY1305) &&
PK11_DoesMechanism(context->slot, CKM_NSS_CHACHA20_POLY1305)) {
context->simulate_mechanism = CKM_NSS_CHACHA20_POLY1305;
} else {
PORT_SetError(PK11_MapError(CKR_MECHANISM_INVALID)); return SECFailure;
}
}
/* * handle session starvation case.. use our last session to multiplex
*/ if (!context->ownSession) {
PK11_EnterContextMonitor(context);
context->savedData = pk11_saveContext(context, context->savedData,
&context->savedLength); if (context->savedData == NULL)
rv = SECFailure; /* clear out out session for others to use */
pk11_Finalize(context);
PK11_ExitContextMonitor(context);
} return rv;
}
/* * Testing interfaces, not for general use. This function forces * an AEAD context into simulation mode even though the target token * can already do PKCS #11 v3.0 Message (i.e. softoken).
*/
SECStatus
_PK11_ContextSetAEADSimulation(PK11Context *context)
{
CK_RV crv; /* only message encrypt and message decrypt contexts can be simulated */ if ((context->operation != (CKA_NSS_MESSAGE | CKA_ENCRYPT)) &&
(context->operation != (CKA_NSS_MESSAGE | CKA_DECRYPT))) {
PORT_SetError(SEC_ERROR_INVALID_ARGS); return SECFailure;
} /* if we are already simulating, return */ if (context->simulate_message) { return SECSuccess;
} /* we need to shutdown the existing AEAD operation */ switch (context->operation) { case CKA_NSS_MESSAGE | CKA_ENCRYPT:
crv = PK11_GETTAB(context->slot)->C_MessageEncryptFinal(context->session); break; case CKA_NSS_MESSAGE | CKA_DECRYPT:
crv = PK11_GETTAB(context->slot)->C_MessageDecryptFinal(context->session); break; default:
PORT_SetError(SEC_ERROR_NOT_INITIALIZED); return SECFailure;
} if (crv != CKR_OK) {
PORT_SetError(PK11_MapError(crv)); return SECFailure;
}
context->simulate_message = PR_TRUE; return SECSuccess;
}
/* * Common Helper Function do come up with a new context.
*/ static PK11Context *
pk11_CreateNewContextInSlot(CK_MECHANISM_TYPE type,
PK11SlotInfo *slot, CK_ATTRIBUTE_TYPE operation,
PK11SymKey *symKey, CK_OBJECT_HANDLE objectID, const SECItem *param, void *pwArg)
{
CK_MECHANISM mech_info;
PK11Context *context;
SECStatus rv;
/* now deal with the fortezza hack... the fortezza hack is an attempt * to get around the issue of the card not allowing you to do a FORTEZZA * LoadIV/Encrypt, which was added because such a combination could be * use to circumvent the key escrow system. Unfortunately SSL needs to * do this kind of operation, so in SSL we do a loadIV (to verify it), * Then GenerateIV, and through away the first 8 bytes on either side
* of the connection.*/
context->fortezzaHack = PR_FALSE; if (type == CKM_SKIPJACK_CBC64) { if (symKey && (symKey->origin == PK11_OriginFortezzaHack)) {
context->fortezzaHack = PR_TRUE;
}
}
/* initialize the critical fields of the context */
context->operation = operation; /* If we were given a symKey, keep our own reference to it so * that the key doesn't disappear in the middle of the operation * if the caller frees it. Public and Private keys are not reference * counted, so the caller just has to keep his copies around until
* the operation completes */
context->key = symKey ? PK11_ReferenceSymKey(symKey) : NULL;
context->objectID = objectID;
context->slot = PK11_ReferenceSlot(slot);
context->session = pk11_GetNewSession(slot, &context->ownSession);
context->pwArg = pwArg; /* get our session */
context->savedData = NULL;
/* save the parameters so that some digesting stuff can do multiple
* begins on a single context */
context->type = type; if (param) { if (param->len > 0) {
context->param = SECITEM_DupItem(param);
} else {
context->param = (SECItem *)&pk11_null_params;
}
} else {
PORT_SetError(SEC_ERROR_INVALID_ARGS);
context->param = NULL;
}
context->init = PR_FALSE;
context->sessionLock = PZ_NewLock(nssILockPK11cxt); if ((context->param == NULL) || (context->sessionLock == NULL)) {
PK11_DestroyContext(context, PR_TRUE); return NULL;
}
/* * put together the various PK11_Create_Context calls used by different * parts of libsec.
*/
PK11Context *
__PK11_CreateContextByRawKey(PK11SlotInfo *slot, CK_MECHANISM_TYPE type,
PK11Origin origin, CK_ATTRIBUTE_TYPE operation, SECItem *key,
SECItem *param, void *wincx)
{
PK11SymKey *symKey = NULL;
PK11Context *context = NULL;
/* first get a slot */ if (slot == NULL) {
slot = PK11_GetBestSlot(type, wincx); if (slot == NULL) {
PORT_SetError(SEC_ERROR_NO_MODULE); goto loser;
}
} else {
PK11_ReferenceSlot(slot);
}
/* now import the key */
symKey = PK11_ImportSymKey(slot, type, origin, operation, key, wincx); if (symKey == NULL) goto loser;
/* * Create a context from a key. We really should make sure we aren't using * the same key in multiple sessions!
*/
PK11Context *
PK11_CreateContextBySymKey(CK_MECHANISM_TYPE type, CK_ATTRIBUTE_TYPE operation,
PK11SymKey *symKey, const SECItem *param)
{
PK11SymKey *newKey;
PK11Context *context;
/* if this slot doesn't support the mechanism, go to a slot that does */
newKey = pk11_ForceSlot(symKey, type, operation); if (newKey == NULL) {
PK11_ReferenceSymKey(symKey);
} else {
symKey = newKey;
}
/* Context keeps its reference to the symKey, so it's safe to * free our reference we we are through, even though we may have
* created the key using pk11_ForceSlot. */
context = pk11_CreateNewContextInSlot(type, symKey->slot, operation, symKey,
symKey->objectID, param, symKey->cx);
PK11_FreeSymKey(symKey); return context;
}
/* To support multipart public key operations (like hash/verify operations),
* we need to create contexts with public keys. */
PK11Context *
PK11_CreateContextByPubKey(CK_MECHANISM_TYPE type, CK_ATTRIBUTE_TYPE operation,
SECKEYPublicKey *pubKey, const SECItem *param, void *pwArg)
{
PK11SlotInfo *slot = pubKey->pkcs11Slot;
SECItem nullparam = { 0, 0, 0 };
/* if this slot doesn't support the mechanism, go to a slot that does */ /* public keys have all their data in the public key data structure, * so there's no need to export the old key, just import this one. The
* import manages consistancy of the public key data structure */ if (slot == NULL || !PK11_DoesMechanism(slot, type)) {
CK_OBJECT_HANDLE objectID;
slot = PK11_GetBestSlot(type, NULL); if (slot == NULL) { return NULL;
}
objectID = PK11_ImportPublicKey(slot, pubKey, PR_FALSE);
PK11_FreeSlot(slot); if (objectID == CK_INVALID_HANDLE) { return NULL;
}
}
/* unlike symkeys, we accept a NULL parameter. map a null parameter * to the empty parameter. This matches the semantics of
* PK11_VerifyWithMechanism */ return pk11_CreateNewContextInSlot(type, pubKey->pkcs11Slot, operation,
NULL, pubKey->pkcs11ID,
param ? param : &nullparam, pwArg);
}
/* To support multipart private key operations (like hash/sign operations),
* we need to create contexts with private keys. */
PK11Context *
PK11_CreateContextByPrivKey(CK_MECHANISM_TYPE type, CK_ATTRIBUTE_TYPE operation,
SECKEYPrivateKey *privKey, const SECItem *param)
{
SECItem nullparam = { 0, 0, 0 }; /* Private keys are generally not movable. If the token the * private key lives on can't do the operation, generally we are * stuck anyway. So no need to try to manipulate the key into
* another token */
/* if this slot doesn't support the mechanism, go to a slot that does */ /* unlike symkeys, we accept a NULL parameter. map a null parameter * to the empty parameter. This matches the semantics of
* PK11_SignWithMechanism */ return pk11_CreateNewContextInSlot(type, privKey->pkcs11Slot, operation,
NULL, privKey->pkcs11ID,
param ? param : &nullparam,
privKey->wincx);
}
/* * Digest contexts don't need keys, but the do need to find a slot. * Macing should use PK11_CreateContextBySymKey.
*/
PK11Context *
PK11_CreateDigestContext(SECOidTag hashAlg)
{ /* digesting has to work without authentication to the slot */
CK_MECHANISM_TYPE type;
PK11SlotInfo *slot;
PK11Context *context;
SECItem param;
type = PK11_AlgtagToMechanism(hashAlg);
slot = PK11_GetBestSlot(type, NULL); if (slot == NULL) {
PORT_SetError(SEC_ERROR_NO_MODULE); return NULL;
}
/* maybe should really be PK11_GenerateNewParam?? */
param.data = NULL;
param.len = 0;
param.type = 0;
/* * create a new context which is the clone of the state of old context.
*/
PK11Context *
PK11_CloneContext(PK11Context *old)
{
PK11Context *newcx;
PRBool needFree = PR_FALSE;
SECStatus rv = SECSuccess; void *data; unsignedlong len;
/* now clone the save state. First we need to find the save state * of the old session. If the old context owns it's session,
* the state needs to be saved, otherwise the state is in saveData. */ if (old->ownSession) {
PK11_EnterContextMonitor(old);
data = pk11_saveContext(old, NULL, &len);
PK11_ExitContextMonitor(old);
needFree = PR_TRUE;
} else {
data = old->savedData;
len = old->savedLength;
}
if (data == NULL) {
PK11_DestroyContext(newcx, PR_TRUE); return NULL;
}
/* now copy that state into our new context. Again we have different * work if the new context owns it's own session. If it does, we * restore the state gathered above. If it doesn't, we copy the
* saveData pointer... */ if (newcx->ownSession) {
PK11_EnterContextMonitor(newcx);
rv = pk11_restoreContext(newcx, data, len);
PK11_ExitContextMonitor(newcx);
} else {
PORT_Assert(newcx->savedData != NULL); if ((newcx->savedData == NULL) || (newcx->savedLength < len)) {
PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
rv = SECFailure;
} else {
PORT_Memcpy(newcx->savedData, data, len);
newcx->savedLength = len;
}
}
/* * save the current context state into a variable. Required to make FORTEZZA * work.
*/
SECStatus
PK11_SaveContext(PK11Context *cx, unsignedchar *save, int *len, int saveLength)
{ unsignedchar *data = NULL;
CK_ULONG length = saveLength;
if (cx->ownSession) {
PK11_EnterContextMonitor(cx);
data = pk11_saveContextHelper(cx, save, &length);
PK11_ExitContextMonitor(cx); if (data)
*len = length;
} elseif ((unsigned)saveLength >= cx->savedLength) {
data = (unsignedchar *)cx->savedData; if (cx->savedData) {
PORT_Memcpy(save, cx->savedData, cx->savedLength);
}
*len = cx->savedLength;
} if (data != NULL) { if (cx->ownSession) {
PORT_ZFree(data, length);
} return SECSuccess;
} else { return SECFailure;
}
}
/* same as above, but may allocate the return buffer. */ unsignedchar *
PK11_SaveContextAlloc(PK11Context *cx, unsignedchar *preAllocBuf, unsignedint pabLen, unsignedint *stateLen)
{ unsignedchar *stateBuf = NULL; unsignedlong length = (unsignedlong)pabLen;
/* * restore the context state into a new running context. Also required for * FORTEZZA .
*/
SECStatus
PK11_RestoreContext(PK11Context *cx, unsignedchar *save, int len)
{
SECStatus rv = SECSuccess; if (cx->ownSession) {
PK11_EnterContextMonitor(cx);
pk11_Finalize(cx);
rv = pk11_restoreContext(cx, save, len);
PK11_ExitContextMonitor(cx);
} else {
PORT_Assert(cx->savedData != NULL); if ((cx->savedData == NULL) || (cx->savedLength < (unsigned)len)) {
PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
rv = SECFailure;
} else {
PORT_Memcpy(cx->savedData, save, len);
cx->savedLength = len;
}
} return rv;
}
/* * This is to get FIPS compliance until we can convert * libjar to use PK11_ hashing functions. It returns PR_FALSE * if we can't get a PK11 Context.
*/
PRBool
PK11_HashOK(SECOidTag algID)
{
PK11Context *cx;
rv = PK11_DigestOp(context, in, len); if (rv != SECSuccess) {
PK11_DestroyContext(context, PR_TRUE); return rv;
}
/* XXX This really should have been an argument to this function! */
max_length = HASH_ResultLenByOidTag(hashAlg);
PORT_Assert(max_length); if (!max_length)
max_length = HASH_LENGTH_MAX;
/* if we ran out of session, we need to restore our previously stored * state.
*/
PK11_EnterContextMonitor(context); if (!context->ownSession) {
rv = pk11_restoreContext(context, context->savedData,
context->savedLength); if (rv != SECSuccess) {
PK11_ExitContextMonitor(context); return rv;
}
}
/* * The fortezza hack is to send 8 extra bytes on the first encrypted and * lose them on the first decrypt.
*/ if (context->fortezzaHack) { unsignedchar random[8]; if (context->operation == CKA_ENCRYPT) {
PK11_ExitContextMonitor(context);
rv = PK11_GenerateRandom(random, sizeof(random));
PK11_EnterContextMonitor(context);
/* since we are offseting the output, we can't encrypt back into * the same buffer... allocate a temporary buffer just for this
* call. */
allocOut = out = (unsignedchar *)PORT_Alloc(maxout); if (out == NULL) {
PK11_ExitContextMonitor(context); return SECFailure;
}
crv = PK11_GETTAB(context->slot)->C_EncryptUpdate(context->session, random, sizeof(random), out, &length);
if (context->fortezzaHack) { if (context->operation == CKA_ENCRYPT) {
PORT_Assert(allocOut);
PORT_Memcpy(saveOut, allocOut, length);
PORT_Free(allocOut);
}
context->fortezzaHack = PR_FALSE;
}
/* * handle session starvation case.. use our last session to multiplex
*/ if (!context->ownSession) {
context->savedData = pk11_saveContext(context, context->savedData,
&context->savedLength); if (context->savedData == NULL)
rv = SECFailure;
/* clear out out session for others to use */
pk11_Finalize(context);
}
PK11_ExitContextMonitor(context); return rv;
}
/* * Simulate the IV generation that normally would happen in the token. * * This is a modifed copy of what is in freebl/gcm.c. We can't use the * version in freebl because of layering, since freebl is inside the token * boundary. These issues are traditionally handled by moving them to util, * but we also have two different Random functions we have two switch between. * Since this is primarily here for tokens that don't support the PKCS #11 * Message Interface, it's OK if they diverge a bit. Slight semantic * differences from the freebl/gcm.c version shouldn't be much more than the * sematic differences between freebl and other tokens which do implement the
* Message Interface. */ static SECStatus
pk11_GenerateIV(PK11Context *context, CK_GENERATOR_FUNCTION ivgen, int fixedBits, unsignedchar *iv, int ivLen)
{ unsignedint i; unsignedint flexBits; unsignedint ivOffset; unsignedint ivNewCount; unsignedchar ivMask; unsignedchar ivSave;
SECStatus rv;
if (context->ivCounter != 0) { /* If we've already generated a message, make sure all subsequent
* messages are using the same generator */ if ((context->ivGen != ivgen) ||
(context->ivFixedBits != fixedBits) ||
(context->ivLen != ivLen)) {
PORT_SetError(SEC_ERROR_INVALID_ARGS); return SECFailure;
}
} else { /* remember these values */
context->ivGen = ivgen;
context->ivFixedBits = fixedBits;
context->ivLen = ivLen; /* now calculate how may bits of IV we have to supply */
flexBits = ivLen * PR_BITS_PER_BYTE; /* first make sure we aren't going to overflow */ if (flexBits < fixedBits) {
PORT_SetError(SEC_ERROR_INVALID_ARGS); return SECFailure;
}
flexBits -= fixedBits; /* if we are generating a random number reduce the acceptable bits to
* avoid birthday attacks */ if (ivgen == CKG_GENERATE_RANDOM) { if (flexBits <= GCMIV_RANDOM_BIRTHDAY_BITS) {
PORT_SetError(SEC_ERROR_INVALID_ARGS); return SECFailure;
} /* see freebl/blapit.h for how GCMIV_RANDOM_BIRTHDAY_BITS is
* calculated. */
flexBits -= GCMIV_RANDOM_BIRTHDAY_BITS;
flexBits = flexBits >> 1;
} if (flexBits == 0) {
PORT_SetError(SEC_ERROR_INVALID_ARGS); return SECFailure;
} /* Turn those bits into the number of IV's we can safely return */ if (flexBits >= sizeof(context->ivMaxCount) * PR_BITS_PER_BYTE) {
context->ivMaxCount = PR_UINT64(0xffffffffffffffff);
} else {
context->ivMaxCount = (PR_UINT64(1) << flexBits);
}
}
/* no generate, accept the IV from the source */ if (ivgen == CKG_NO_GENERATE) {
context->ivCounter = 1; return SECSuccess;
}
/* make sure we haven't exceeded the number of IVs we can return
* for this key, generator, and IV size */ if (context->ivCounter >= context->ivMaxCount) { /* use a unique error from just bad user input */
PORT_SetError(SEC_ERROR_EXTRA_INPUT); return SECFailure;
}
/* build to mask to handle the first byte of the IV */
ivOffset = fixedBits / PR_BITS_PER_BYTE;
ivMask = 0xff >> ((PR_BITS_PER_BYTE - (fixedBits & 7)) & 7);
ivNewCount = ivLen - ivOffset;
/* finally generate the IV */ switch (ivgen) { case CKG_GENERATE: /* default to counter */ case CKG_GENERATE_COUNTER:
iv[ivOffset] = (iv[ivOffset] & ~ivMask) |
(PORT_GET_BYTE_BE(context->ivCounter, 0, ivNewCount) & ivMask); for (i = 1; i < ivNewCount; i++) {
iv[ivOffset + i] =
PORT_GET_BYTE_BE(context->ivCounter, i, ivNewCount);
} break; case CKG_GENERATE_COUNTER_XOR:
iv[ivOffset] ^=
(PORT_GET_BYTE_BE(context->ivCounter, 0, ivNewCount) & ivMask); for (i = 1; i < ivNewCount; i++) {
iv[ivOffset + i] ^=
PORT_GET_BYTE_BE(context->ivCounter, i, ivNewCount);
} break; case CKG_GENERATE_RANDOM:
ivSave = iv[ivOffset] & ~ivMask;
rv = PK11_GenerateRandom(iv + ivOffset, ivNewCount);
iv[ivOffset] = ivSave | (iv[ivOffset] & ivMask); if (rv != SECSuccess) { return rv;
} break;
}
context->ivCounter++; return SECSuccess;
}
/* * PKCS #11 v2.40 did not have a message interface. If our module can't
* do the message interface use the old method of doing AEAD */ static SECStatus
pk11_AEADSimulateOp(PK11Context *context, void *params, int paramslen, constunsignedchar *aad, int aadlen, unsignedchar *out, int *outlen, int maxout, constunsignedchar *in, int inlen)
{ unsignedint length = maxout;
SECStatus rv = SECSuccess; unsignedchar *saveOut = out; unsignedchar *allocOut = NULL;
/* * first we need to convert the single shot (v2.40) parameters into * the message version of the parameters. This usually involves * copying the Nonce or IV, setting the AAD from our parameter list
* and handling the tag differences */
CK_GCM_PARAMS_V3 gcm;
CK_GCM_MESSAGE_PARAMS *gcm_message;
CK_CCM_PARAMS ccm;
CK_CCM_MESSAGE_PARAMS *ccm_message;
CK_SALSA20_CHACHA20_POLY1305_PARAMS chacha_poly;
CK_SALSA20_CHACHA20_POLY1305_MSG_PARAMS *chacha_poly_message;
CK_NSS_AEAD_PARAMS nss_chacha_poly;
CK_MECHANISM_TYPE mechanism = context->simulate_mechanism;
SECItem sim_params = { 0, NULL, 0 }; unsignedchar *tag = NULL; unsignedint taglen;
PRBool encrypt;
*outlen = 0; /* figure out if we are encrypting or decrypting, as tags are
* handled differently in both */ switch (context->operation) { case CKA_NSS_MESSAGE | CKA_ENCRYPT:
encrypt = PR_TRUE; break; case CKA_NSS_MESSAGE | CKA_DECRYPT:
encrypt = PR_FALSE; break; default:
PORT_SetError(SEC_ERROR_INVALID_ARGS); return SECFailure;
}
switch (mechanism) { case CKM_CHACHA20_POLY1305: case CKM_SALSA20_POLY1305: if (paramslen != sizeof(CK_SALSA20_CHACHA20_POLY1305_MSG_PARAMS)) {
PORT_SetError(SEC_ERROR_INVALID_ARGS); return SECFailure;
}
chacha_poly_message =
(CK_SALSA20_CHACHA20_POLY1305_MSG_PARAMS *)params;
chacha_poly.pNonce = chacha_poly_message->pNonce;
chacha_poly.ulNonceLen = chacha_poly_message->ulNonceLen;
chacha_poly.pAAD = (CK_BYTE_PTR)aad;
chacha_poly.ulAADLen = aadlen;
tag = chacha_poly_message->pTag;
taglen = 16;
sim_params.data = (unsignedchar *)&chacha_poly;
sim_params.len = sizeof(chacha_poly); /* SALSA20_POLY1305 and CHACHA20_POLY1305 do not generate the iv
* internally, don't simulate it either */ break; case CKM_NSS_CHACHA20_POLY1305: if (paramslen != sizeof(CK_SALSA20_CHACHA20_POLY1305_MSG_PARAMS)) {
PORT_SetError(SEC_ERROR_INVALID_ARGS); return SECFailure;
}
chacha_poly_message =
(CK_SALSA20_CHACHA20_POLY1305_MSG_PARAMS *)params;
tag = chacha_poly_message->pTag;
taglen = 16;
nss_chacha_poly.pNonce = chacha_poly_message->pNonce;
nss_chacha_poly.ulNonceLen = chacha_poly_message->ulNonceLen;
nss_chacha_poly.pAAD = (CK_BYTE_PTR)aad;
nss_chacha_poly.ulAADLen = aadlen;
nss_chacha_poly.ulTagLen = taglen;
sim_params.data = (unsignedchar *)&nss_chacha_poly;
sim_params.len = sizeof(nss_chacha_poly); /* CKM_NSS_CHACHA20_POLY1305 does not generate the iv
* internally, don't simulate it either */ break; case CKM_AES_CCM: if (paramslen != sizeof(CK_CCM_MESSAGE_PARAMS)) {
PORT_SetError(SEC_ERROR_INVALID_ARGS); return SECFailure;
}
ccm_message = (CK_CCM_MESSAGE_PARAMS *)params;
ccm.ulDataLen = ccm_message->ulDataLen;
ccm.pNonce = ccm_message->pNonce;
ccm.ulNonceLen = ccm_message->ulNonceLen;
ccm.pAAD = (CK_BYTE_PTR)aad;
ccm.ulAADLen = aadlen;
ccm.ulMACLen = ccm_message->ulMACLen;
tag = ccm_message->pMAC;
taglen = ccm_message->ulMACLen;
sim_params.data = (unsignedchar *)&ccm;
sim_params.len = sizeof(ccm); if (encrypt) { /* simulate generating the IV */
rv = pk11_GenerateIV(context, ccm_message->nonceGenerator,
ccm_message->ulNonceFixedBits,
ccm_message->pNonce,
ccm_message->ulNonceLen); if (rv != SECSuccess) { return rv;
}
} break; case CKM_AES_GCM: if (paramslen != sizeof(CK_GCM_MESSAGE_PARAMS)) {
PORT_SetError(SEC_ERROR_INVALID_ARGS); return SECFailure;
}
gcm_message = (CK_GCM_MESSAGE_PARAMS *)params;
gcm.pIv = gcm_message->pIv;
gcm.ulIvLen = gcm_message->ulIvLen;
gcm.ulIvBits = gcm.ulIvLen * PR_BITS_PER_BYTE;
gcm.pAAD = (CK_BYTE_PTR)aad;
gcm.ulAADLen = aadlen;
gcm.ulTagBits = gcm_message->ulTagBits;
tag = gcm_message->pTag;
taglen = (gcm_message->ulTagBits + (PR_BITS_PER_BYTE - 1)) / PR_BITS_PER_BYTE;
sim_params.data = (unsignedchar *)&gcm;
sim_params.len = sizeof(gcm); if (encrypt) { /* simulate generating the IV */
rv = pk11_GenerateIV(context, gcm_message->ivGenerator,
gcm_message->ulIvFixedBits,
gcm_message->pIv, gcm_message->ulIvLen); if (rv != SECSuccess) { return rv;
}
} break; default:
PORT_SetError(SEC_ERROR_INVALID_ALGORITHM); return SECFailure;
} /* now handle the tag. The message interface separates the tag from * the data, while the single shot gets and puts the tag at the end of
* the encrypted data. */ if (!encrypt) { /* In the decrypt case, if the tag is already at the end of the * input buffer we are golden, otherwise we'll need a new input
* buffer and copy the tag at the end of it */ if (tag != in + inlen) {
allocOut = PORT_Alloc(inlen + taglen); if (allocOut == NULL) { return SECFailure;
}
PORT_Memcpy(allocOut, in, inlen);
PORT_Memcpy(allocOut + inlen, tag, taglen);
in = allocOut;
}
inlen = inlen + taglen;
} else { /* if we end up allocating, we don't want to overrun this buffer,
* so we fail early here */ if (maxout < inlen) {
PORT_SetError(SEC_ERROR_INVALID_ARGS); return SECFailure;
} /* in the encrypt case, we are fine if maxout is big enough to hold
* the tag. We'll copy the tag after the operation */ if (maxout < inlen + taglen) {
allocOut = PORT_Alloc(inlen + taglen); if (allocOut == NULL) { return SECFailure;
}
out = allocOut;
length = maxout = inlen + taglen;
}
} /* now do the operation */ if (encrypt) {
rv = PK11_Encrypt(context->key, mechanism, &sim_params, out, &length,
maxout, in, inlen);
} else {
rv = PK11_Decrypt(context->key, mechanism, &sim_params, out, &length,
maxout, in, inlen);
} if (rv != SECSuccess) { /* If the mechanism was CKM_AES_GCM, the module may have been * following the same error as old versions of NSS. Retry with
* the CK_NSS_GCM_PARAMS */ if ((mechanism == CKM_AES_GCM) &&
(PORT_GetError() == SEC_ERROR_BAD_DATA)) {
CK_NSS_GCM_PARAMS gcm_nss;
gcm_message = (CK_GCM_MESSAGE_PARAMS *)params;
gcm_nss.pIv = gcm_message->pIv;
gcm_nss.ulIvLen = gcm_message->ulIvLen;
gcm_nss.pAAD = (CK_BYTE_PTR)aad;
gcm_nss.ulAADLen = aadlen;
gcm_nss.ulTagBits = gcm_message->ulTagBits;
sim_params.data = (unsignedchar *)&gcm_nss;
sim_params.len = sizeof(gcm_nss); if (encrypt) {
rv = PK11_Encrypt(context->key, mechanism, &sim_params, out,
&length, maxout, in, inlen);
} else {
rv = PK11_Decrypt(context->key, mechanism, &sim_params, out,
&length, maxout, in, inlen);
} if (rv != SECSuccess) { goto fail;
}
} else { goto fail;
}
}
/* on encrypt, separate the output buffer from the tag */ if (encrypt) { if ((length < taglen) || (length > inlen + taglen)) { /* PKCS #11 module should not return a length smaller than
* taglen, or bigger than inlen+taglen */
PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
rv = SECFailure; goto fail;
}
length = length - taglen; if (allocOut) { /* * If we used a temporary buffer, copy it out to the original * buffer.
*/
PORT_Memcpy(saveOut, allocOut, length);
} /* if the tag isn't in the right place, copy it out */ if (tag != out + length) {
PORT_Memcpy(tag, out + length, taglen);
}
}
*outlen = length;
rv = SECSuccess;
fail: if (allocOut) {
PORT_Free(allocOut);
} return rv;
}
/* * Do an AEAD operation. This function optionally returns * and IV on Encrypt for all mechanism. NSS knows which mechanisms * generate IV's in the token and which don't. This allows the * applications to make a single call without special handling for * each AEAD mechanism (the special handling is all contained here.
*/
SECStatus
PK11_AEADOp(PK11Context *context, CK_GENERATOR_FUNCTION ivgen, int fixedbits, unsignedchar *iv, int ivlen, constunsignedchar *aad, int aadlen, unsignedchar *out, int *outlen, int maxout, unsignedchar *tag, int taglen, constunsignedchar *in, int inlen)
{
CK_GCM_MESSAGE_PARAMS gcm_message;
CK_CCM_MESSAGE_PARAMS ccm_message;
CK_SALSA20_CHACHA20_POLY1305_MSG_PARAMS chacha_poly_message; void *params; int paramslen;
SECStatus rv;
switch (context->simulate_mechanism) { case CKM_CHACHA20_POLY1305: case CKM_SALSA20_POLY1305: case CKM_NSS_CHACHA20_POLY1305:
chacha_poly_message.pNonce = iv;
chacha_poly_message.ulNonceLen = ivlen;
chacha_poly_message.pTag = tag;
params = &chacha_poly_message;
paramslen = sizeof(CK_SALSA20_CHACHA20_POLY1305_MSG_PARAMS); /* SALSA20_POLY1305 and CHACHA20_POLY1305 do not generate the iv
* internally, Do it here. */ if (context->operation == (CKA_NSS_MESSAGE | CKA_ENCRYPT)) { /* simulate generating the IV */
rv = pk11_GenerateIV(context, ivgen, fixedbits, iv, ivlen); if (rv != SECSuccess) { return rv;
}
} break; case CKM_AES_GCM:
gcm_message.pIv = iv;
gcm_message.ulIvLen = ivlen;
gcm_message.ivGenerator = ivgen;
gcm_message.ulIvFixedBits = fixedbits;
gcm_message.pTag = tag;
gcm_message.ulTagBits = taglen * 8;
params = &gcm_message;
paramslen = sizeof(CK_GCM_MESSAGE_PARAMS); /* GCM generates IV internally */ break; case CKM_AES_CCM:
ccm_message.ulDataLen = inlen;
ccm_message.pNonce = iv;
ccm_message.ulNonceLen = ivlen;
ccm_message.nonceGenerator = ivgen;
ccm_message.ulNonceFixedBits = fixedbits;
ccm_message.pMAC = tag;
ccm_message.ulMACLen = taglen;
params = &ccm_message;
paramslen = sizeof(CK_GCM_MESSAGE_PARAMS); /* CCM generates IV internally */ break;
/* Do and AED operation. The application builds the params on it's own * and passes them in. This allows applications direct access to the params * so they can use mechanisms not yet understood by, NSS, or get semantics
* not suppied by PK11_AEAD. */
SECStatus
PK11_AEADRawOp(PK11Context *context, void *params, int paramslen, constunsignedchar *aad, int aadlen, unsignedchar *out, int *outlen, int maxout, constunsignedchar *in, int inlen)
{
CK_RV crv = CKR_OK;
CK_ULONG length = maxout;
SECStatus rv = SECSuccess;
/* * The PKCS 11 module does not support the message interface, fall
* back to using single shot operation */ if (context->simulate_message) { return pk11_AEADSimulateOp(context, params, paramslen, aad, aadlen,
out, outlen, maxout, in, inlen);
}
/* if we ran out of session, we need to restore our previously stored * state.
*/
PK11_EnterContextMonitor(context); if (!context->ownSession) {
rv = pk11_restoreContext(context, context->savedData,
context->savedLength); if (rv != SECSuccess) {
PK11_ExitContextMonitor(context); return rv;
}
}
if (inLen == 0) { return SECSuccess;
} if (!in) {
PORT_SetError(SEC_ERROR_INVALID_ARGS); return SECFailure;
}
/* if we ran out of session, we need to restore our previously stored * state.
*/
context->init = PR_FALSE;
PK11_EnterContextMonitor(context); if (!context->ownSession) {
rv = pk11_restoreContext(context, context->savedData,
context->savedLength); if (rv != SECSuccess) {
PK11_ExitContextMonitor(context); return rv;
}
}
switch (context->operation) { /* also for MAC'ing */ case CKA_SIGN:
crv = PK11_GETTAB(context->slot)->C_SignUpdate(context->session, (unsignedchar *)in, inLen); break; case CKA_VERIFY:
crv = PK11_GETTAB(context->slot)->C_VerifyUpdate(context->session, (unsignedchar *)in, inLen); break; case CKA_DIGEST:
crv = PK11_GETTAB(context->slot)->C_DigestUpdate(context->session, (unsignedchar *)in, inLen); break; default:
crv = CKR_OPERATION_NOT_INITIALIZED; break;
}
if (crv != CKR_OK) {
PORT_SetError(PK11_MapError(crv));
rv = SECFailure;
}
/* * handle session starvation case.. use our last session to multiplex
*/ if (!context->ownSession) {
context->savedData = pk11_saveContext(context, context->savedData,
&context->savedLength); if (context->savedData == NULL)
rv = SECFailure;
/* clear out out session for others to use */
pk11_Finalize(context);
}
PK11_ExitContextMonitor(context); return rv;
}
if (!context || !key) {
PORT_SetError(SEC_ERROR_INVALID_ARGS); return SECFailure;
}
/* if we ran out of session, we need to restore our previously stored * state.
*/ if (context->slot != key->slot) {
newKey = pk11_CopyToSlot(context->slot, CKM_SSL3_SHA1_MAC, CKA_SIGN, key);
} else {
newKey = PK11_ReferenceSymKey(key);
}
if (crv != CKR_OK) {
PORT_SetError(PK11_MapError(crv));
rv = SECFailure;
}
/* * handle session starvation case.. use our last session to multiplex
*/ if (!context->ownSession) {
context->savedData = pk11_saveContext(context, context->savedData,
&context->savedLength); if (context->savedData == NULL)
rv = SECFailure;
/* clear out out session for others to use */
pk11_Finalize(context);
}
PK11_ExitContextMonitor(context); if (newKey)
PK11_FreeSymKey(newKey); return rv;
}
/* * externally callable version of the lowercase pk11_finalize().
*/
SECStatus
PK11_Finalize(PK11Context *context)
{
SECStatus rv;
/* * clean up a cipher operation, so the session can be used by * someone new.
*/
SECStatus
pk11_Finalize(PK11Context *context)
{
CK_ULONG count = 0;
CK_RV crv; unsignedchar stackBuf[256]; unsignedchar *buffer = NULL;
if (!context->ownSession) { return SECSuccess;
}
finalize: switch (context->operation) { case CKA_ENCRYPT:
crv = PK11_GETTAB(context->slot)->C_EncryptFinal(context->session, buffer, &count); break; case CKA_DECRYPT:
crv = PK11_GETTAB(context->slot)->C_DecryptFinal(context->session, buffer, &count); break; case CKA_SIGN:
crv = PK11_GETTAB(context->slot)->C_SignFinal(context->session, buffer, &count); break; case CKA_VERIFY:
crv = PK11_GETTAB(context->slot)->C_VerifyFinal(context->session, buffer, count); break; case CKA_DIGEST:
crv = PK11_GETTAB(context->slot)->C_DigestFinal(context->session, buffer, &count); break; case CKA_NSS_MESSAGE | CKA_ENCRYPT:
crv = PK11_GETTAB(context->slot)->C_MessageEncryptFinal(context->session); break; case CKA_NSS_MESSAGE | CKA_DECRYPT:
crv = PK11_GETTAB(context->slot)->C_MessageDecryptFinal(context->session); break; case CKA_NSS_MESSAGE | CKA_SIGN:
crv = PK11_GETTAB(context->slot)->C_MessageSignFinal(context->session); break; case CKA_NSS_MESSAGE | CKA_VERIFY:
crv = PK11_GETTAB(context->slot)->C_MessageVerifyFinal(context->session); break; default:
crv = CKR_OPERATION_NOT_INITIALIZED; break;
}
if (crv != CKR_OK) { if (buffer != stackBuf) {
PORT_Free(buffer);
} if (crv == CKR_OPERATION_NOT_INITIALIZED) { /* if there's no operation, it is finalized */ return SECSuccess;
}
PORT_SetError(PK11_MapError(crv)); return SECFailure;
}
/* Message interface does not need to allocate a final buffer */ if (((context->operation) & CKA_NSS_MESSAGE_MASK) == CKA_NSS_MESSAGE) { return SECSuccess;
}
/* try to finalize the session with a buffer */ if (buffer == NULL) { if (count <= sizeof stackBuf) {
buffer = stackBuf;
} else {
buffer = PORT_Alloc(count); if (buffer == NULL) { return SECFailure;
}
} goto finalize;
} if (buffer != stackBuf) {
PORT_Free(buffer);
} return SECSuccess;
}
/* * Return the final digested or signed data... * this routine can either take pre initialized data, or allocate data * either out of an arena or out of the standard heap.
*/
SECStatus
PK11_DigestFinal(PK11Context *context, unsignedchar *data, unsignedint *outLen, unsignedint length)
{
CK_ULONG len;
CK_RV crv;
SECStatus rv;
/* message interface returns no data on Final, Should not use DigestFinal
* in this case */ if (((context->operation) & CKA_NSS_MESSAGE_MASK) == CKA_NSS_MESSAGE) {
PORT_SetError(SEC_ERROR_INVALID_ARGS); return SECFailure;
}
/* if we ran out of session, we need to restore our previously stored * state.
*/
PK11_EnterContextMonitor(context); if (!context->ownSession) {
rv = pk11_restoreContext(context, context->savedData,
context->savedLength); if (rv != SECSuccess) {
PK11_ExitContextMonitor(context); return rv;
}
}
len = length; switch (context->operation) { case CKA_SIGN:
crv = PK11_GETTAB(context->slot)->C_SignFinal(context->session, data, &len); break; case CKA_VERIFY:
crv = PK11_GETTAB(context->slot)->C_VerifyFinal(context->session, data, len); break; case CKA_DIGEST:
crv = PK11_GETTAB(context->slot)->C_DigestFinal(context->session, data, &len); break; case CKA_ENCRYPT:
crv = PK11_GETTAB(context->slot)->C_EncryptFinal(context->session, data, &len); break; case CKA_DECRYPT:
crv = PK11_GETTAB(context->slot)->C_DecryptFinal(context->session, data, &len); break; default:
crv = CKR_OPERATION_NOT_INITIALIZED; break;
}
PK11_ExitContextMonitor(context);
context->init = PR_FALSE; /* allow Begin to start up again */
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