The Tor Browser: security/nss/lib/pk11wrap/pk11cxt.c@b8a032363ba2 (annotated)

security/nss/lib/pk11wrap/pk11cxt.c@b8a032363ba2 (annotated)

security/nss/lib/pk11wrap/pk11cxt.c

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

 /* 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.
  */
 #include "seccomon.h"
 #include "secmod.h"
 #include "nssilock.h"
 #include "secmodi.h"
 #include "secmodti.h"
 #include "pkcs11.h"
 #include "pk11func.h"
 #include "secitem.h"
 #include "secoid.h"
 #include "sechash.h"
 #include "secerr.h"
 static const SECItem pk11_null_params = { 0 };
 /**********************************************************************
  *
  *                   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.
  */
 static unsigned char *
 pk11_saveContextHelper(PK11Context *context, unsigned char *buffer,
                        unsigned long *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
 	 */
 	unsigned long bufLen = *savedLength;
 	buffer = PORT_Alloc(bufLen);
 	if (buffer == NULL) {
 	    return (unsigned char *)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 (unsigned char *)NULL;
     }
     return buffer;
 }
 void *
 pk11_saveContext(PK11Context *context, void *space, unsigned long *savedLength)
 {
     return pk11_saveContextHelper(context,
                                   (unsigned char *)space, savedLength);
 }
 /*
  * restore the current context
  */
 SECStatus
 pk11_restoreContext(PK11Context *context,void *space, unsigned long savedLength)
 {
     CK_RV crv;
     CK_OBJECT_HANDLE objectID = (context->key) ? context->key->objectID:
 			CK_INVALID_HANDLE;
     PORT_Assert(space != NULL);
     if (space == NULL) {
 	PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
 	return SECFailure;
     }
     crv = PK11_GETTAB(context->slot)->C_SetOperationState(context->session,
         (CK_BYTE_PTR)space, savedLength, objectID, 0);
     if (crv != CKR_OK) {
        PORT_SetError( PK11_MapError(crv));
        return SECFailure;
    }
    return SECSuccess;
 }
 SECStatus pk11_Finalize(PK11Context *context);
 /*
  * Context initialization. Used by all flavors of CreateContext
  */
 static SECStatus
 pk11_context_init(PK11Context *context, CK_MECHANISM *mech_info)
 {
     CK_RV crv;
     PK11SymKey *symKey = context->key;
     SECStatus rv = SECSuccess;
     switch (context->operation) {
     case CKA_ENCRYPT:
 	crv=PK11_GETTAB(context->slot)->C_EncryptInit(context->session,
 				mech_info, symKey->objectID);
 	break;
     case CKA_DECRYPT:
 	if (context->fortezzaHack) {
 	    CK_ULONG count = 0;;
 	    /* generate the IV for fortezza */
 	    crv=PK11_GETTAB(context->slot)->C_EncryptInit(context->session,
 				mech_info, symKey->objectID);
 	    if (crv != CKR_OK) break;
 	    PK11_GETTAB(context->slot)->C_EncryptFinal(context->session,
 				NULL, &count);
 	}
 	crv=PK11_GETTAB(context->slot)->C_DecryptInit(context->session,
 				mech_info, symKey->objectID);
 	break;
     case CKA_SIGN:
 	crv=PK11_GETTAB(context->slot)->C_SignInit(context->session,
 				mech_info, symKey->objectID);
 	break;
     case CKA_VERIFY:
 	crv=PK11_GETTAB(context->slot)->C_SignInit(context->session,
 				mech_info, symKey->objectID);
 	break;
     case CKA_DIGEST:
 	crv=PK11_GETTAB(context->slot)->C_DigestInit(context->session,
 				mech_info);
 	break;
     default:
 	crv = CKR_OPERATION_NOT_INITIALIZED;
 	break;
     }
     if (crv != CKR_OK) {
         PORT_SetError( PK11_MapError(crv) );
         return 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);
     }
     return rv;
 }
 /*
  * 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,
 							     SECItem *param)
 {
     CK_MECHANISM mech_info;
     PK11Context *context;
     SECStatus rv;
     PORT_Assert(slot != NULL);
     if (!slot || (!symKey && ((operation != CKA_DIGEST) ||
 	                      (type == CKM_SKIPJACK_CBC64)))) {
 	PORT_SetError(SEC_ERROR_INVALID_ARGS);
 	return NULL;
     }
     context = (PK11Context *) PORT_Alloc(sizeof(PK11Context));
     if (context == NULL) {
 	return NULL;
     }
     /* 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->origin == PK11_OriginFortezzaHack) {
 	    context->fortezzaHack = PR_TRUE;
 	}
     }
     /* initialize the critical fields of the context */
     context->operation = operation;
     context->key = symKey ? PK11_ReferenceSymKey(symKey) : NULL;
     context->slot = PK11_ReferenceSlot(slot);
     context->session = pk11_GetNewSession(slot,&context->ownSession);
     context->cx = symKey ? symKey->cx : NULL;
     /* 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;
     }
     mech_info.mechanism = type;
     mech_info.pParameter = param->data;
     mech_info.ulParameterLen = param->len;
     PK11_EnterContextMonitor(context);
     rv = pk11_context_init(context,&mech_info);
     PK11_ExitContextMonitor(context);
     if (rv != SECSuccess) {
 	PK11_DestroyContext(context,PR_TRUE);
 	return NULL;
     }
     context->init = PR_TRUE;
     return context;
 }
 /*
  * 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;
     context = PK11_CreateContextBySymKey(type, operation, symKey, param);
 loser:
     if (symKey) {
         PK11_FreeSymKey(symKey);
     }
     if (slot) {
         PK11_FreeSlot(slot);
     }
     return context;
 }
 PK11Context *
 PK11_CreateContextByRawKey(PK11SlotInfo *slot, CK_MECHANISM_TYPE type,
      PK11Origin origin, CK_ATTRIBUTE_TYPE operation, SECItem *key,
 						SECItem *param, void *wincx)
 {
     return __PK11_CreateContextByRawKey(slot, type, origin, operation,
                                         key, param, wincx);
 }
 /*
  * Create a context from a key. We really should make sure we aren't using
  * the same key in multiple session!
  */
 PK11Context *
 PK11_CreateContextBySymKey(CK_MECHANISM_TYPE type,CK_ATTRIBUTE_TYPE operation,
 			PK11SymKey *symKey, 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 Adopts the symKey.... */
     context = pk11_CreateNewContextInSlot(type, symKey->slot, operation, symKey,
 							     param);
     PK11_FreeSymKey(symKey);
     return context;
 }
 /*
  * 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;
     context = pk11_CreateNewContextInSlot(type, slot, CKA_DIGEST, NULL, &param);
     PK11_FreeSlot(slot);
     return context;
 }
 /*
  * 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;
      unsigned long len;
      newcx = pk11_CreateNewContextInSlot(old->type, old->slot, old->operation,
 						old->key, old->param);
      if (newcx == NULL) return NULL;
      /* 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;
 	}
     }
     if (needFree) PORT_Free(data);
     if (rv != SECSuccess) {
 	PK11_DestroyContext(newcx,PR_TRUE);
 	return NULL;
     }
     return newcx;
 }
 /*
  * save the current context state into a variable. Required to make FORTEZZA
  * work.
  */
 SECStatus
 PK11_SaveContext(PK11Context *cx,unsigned char *save,int *len, int saveLength)
 {
     unsigned char * 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;
     } else if ((unsigned) saveLength >= cx->savedLength) {
 	data = (unsigned char*)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. */
 unsigned char *
 PK11_SaveContextAlloc(PK11Context *cx,
                       unsigned char *preAllocBuf, unsigned int pabLen,
                       unsigned int *stateLen)
 {
     unsigned char *stateBuf = NULL;
     unsigned long length = (unsigned long)pabLen;
     if (cx->ownSession) {
         PK11_EnterContextMonitor(cx);
 	stateBuf = pk11_saveContextHelper(cx, preAllocBuf, &length);
         PK11_ExitContextMonitor(cx);
 	*stateLen = (stateBuf != NULL) ? length : 0;
     } else {
 	if (pabLen < cx->savedLength) {
 	    stateBuf = (unsigned char *)PORT_Alloc(cx->savedLength);
 	    if (!stateBuf) {
 		return (unsigned char *)NULL;
 	    }
 	} else {
 	    stateBuf = preAllocBuf;
 	}
 	if (cx->savedData) {
 	    PORT_Memcpy(stateBuf, cx->savedData, cx->savedLength);
 	}
 	*stateLen = cx->savedLength;
     }
     return stateBuf;
 }
 /*
  * restore the context state into a new running context. Also required for
  * FORTEZZA .
  */
 SECStatus
 PK11_RestoreContext(PK11Context *cx,unsigned char *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;
     cx = PK11_CreateDigestContext(algID);
     if (cx == NULL) return PR_FALSE;
     PK11_DestroyContext(cx, PR_TRUE);
     return PR_TRUE;
 }
 /*
  * start a new digesting or Mac'ing operation on this context
  */
 SECStatus PK11_DigestBegin(PK11Context *cx)
 {
     CK_MECHANISM mech_info;
     SECStatus rv;
     if (cx->init == PR_TRUE) {
 	return SECSuccess;
     }
     /*
      * make sure the old context is clear first
      */
     PK11_EnterContextMonitor(cx);
     pk11_Finalize(cx);
     mech_info.mechanism = cx->type;
     mech_info.pParameter = cx->param->data;
     mech_info.ulParameterLen = cx->param->len;
     rv = pk11_context_init(cx,&mech_info);
     PK11_ExitContextMonitor(cx);
     if (rv != SECSuccess) {
 	return SECFailure;
     }
     cx->init = PR_TRUE;
     return SECSuccess;
 }
 SECStatus
 PK11_HashBuf(SECOidTag hashAlg, unsigned char *out, const unsigned char *in,
 								PRInt32 len) {
     PK11Context *context;
     unsigned int max_length;
     unsigned int out_length;
     SECStatus rv;
     /* len will be passed to PK11_DigestOp as unsigned. */
     if (len < 0) {
         PORT_SetError(SEC_ERROR_INVALID_ARGS);
         return SECFailure;
     }
     context = PK11_CreateDigestContext(hashAlg);
     if (context == NULL) return SECFailure;
     rv = PK11_DigestBegin(context);
     if (rv != SECSuccess) {
 	PK11_DestroyContext(context, PR_TRUE);
 	return rv;
     }
     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;
     rv = PK11_DigestFinal(context,out,&out_length,max_length);
     PK11_DestroyContext(context, PR_TRUE);
     return rv;
 }
 /*
  * execute a bulk encryption operation
  */
 SECStatus
 PK11_CipherOp(PK11Context *context, unsigned char * out, int *outlen,
 				int maxout, const unsigned char *in, int inlen)
 {
     CK_RV crv = CKR_OK;
     CK_ULONG length = maxout;
     CK_ULONG offset =0;
     SECStatus rv = SECSuccess;
     unsigned char *saveOut = out;
     unsigned char *allocOut = NULL;
     /* 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) {
 	unsigned char 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 = (unsigned char*)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);
 	    out += length;
 	    maxout -= length;
 	    offset = length;
 	} else if (context->operation == CKA_DECRYPT) {
 	    length = sizeof(random);
 	    crv = PK11_GETTAB(context->slot)->C_DecryptUpdate(context->session,
 		(CK_BYTE_PTR)in,sizeof(random),random,&length);
 	    inlen -= length;
 	    in += length;
 	    context->fortezzaHack = PR_FALSE;
 	}
     }
     switch (context->operation) {
     case CKA_ENCRYPT:
 	length = maxout;
 	crv=PK11_GETTAB(context->slot)->C_EncryptUpdate(context->session,
 							(CK_BYTE_PTR)in, inlen,
 							out, &length);
 	length += offset;
 	break;
     case CKA_DECRYPT:
 	length = maxout;
 	crv=PK11_GETTAB(context->slot)->C_DecryptUpdate(context->session,
 							(CK_BYTE_PTR)in, inlen,
 							out, &length);
 	break;
     default:
 	crv = CKR_OPERATION_NOT_INITIALIZED;
 	break;
     }
     if (crv != CKR_OK) {
         PORT_SetError( PK11_MapError(crv) );
 	*outlen = 0;
         rv = SECFailure;
     } else {
     	*outlen = 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;
 }
 /*
  * execute a digest/signature operation
  */
 SECStatus
 PK11_DigestOp(PK11Context *context, const unsigned char * in, unsigned inLen)
 {
     CK_RV crv = CKR_OK;
     SECStatus rv = SECSuccess;
     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,
 						     (unsigned char *)in,
 						     inLen);
 	break;
     case CKA_VERIFY:
 	crv=PK11_GETTAB(context->slot)->C_VerifyUpdate(context->session,
 						       (unsigned char *)in,
 						       inLen);
 	break;
     case CKA_DIGEST:
 	crv=PK11_GETTAB(context->slot)->C_DigestUpdate(context->session,
 						       (unsigned char *)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;
 }
 /*
  * Digest a key if possible./
  */
 SECStatus
 PK11_DigestKey(PK11Context *context, PK11SymKey *key)
 {
     CK_RV crv = CKR_OK;
     SECStatus rv = SECSuccess;
     PK11SymKey *newKey = NULL;
     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);
     }
     context->init = PR_FALSE;
     PK11_EnterContextMonitor(context);
     if (!context->ownSession) {
         rv = pk11_restoreContext(context,context->savedData,
 							context->savedLength);
 	if (rv != SECSuccess) {
 	    PK11_ExitContextMonitor(context);
             PK11_FreeSymKey(newKey);
 	    return rv;
 	}
     }
     if (newKey == NULL) {
 	crv = CKR_KEY_TYPE_INCONSISTENT;
 	if (key->data.data) {
 	    crv=PK11_GETTAB(context->slot)->C_DigestUpdate(context->session,
 					key->data.data,key->data.len);
 	}
     } else {
 	crv=PK11_GETTAB(context->slot)->C_DigestKey(context->session,
 							newKey->objectID);
     }
     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;
     PK11_EnterContextMonitor(context);
     rv = pk11_Finalize(context);
     PK11_ExitContextMonitor(context);
     return 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;
     unsigned char stackBuf[256];
     unsigned char *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;
     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;
     }
     /* 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) {
 		PORT_SetError(SEC_ERROR_NO_MEMORY);
 		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,unsigned char *data,
 			unsigned int *outLen, unsigned int length)
 {
     CK_ULONG len;
     CK_RV crv;
     SECStatus rv;
     /* 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);
     *outLen = (unsigned int) len;
     context->init = PR_FALSE; /* allow Begin to start up again */
     if (crv != CKR_OK) {
         PORT_SetError( PK11_MapError(crv) );
 	return SECFailure;
     }
     return SECSuccess;
 }

The Tor Browser / annotate

security/nss/lib/pk11wrap/pk11cxt.c@b8a032363ba2 (annotated)

security/nss/lib/pk11wrap/pk11cxt.c