The Tor Browser: security/nss/lib/softoken/lowpbe.c@6474c204b198 (annotated)

security/nss/lib/softoken/lowpbe.c@6474c204b198 (annotated)

security/nss/lib/softoken/lowpbe.c

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /* 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 "plarena.h"
 #include "seccomon.h"
 #include "secitem.h"
 #include "secport.h"
 #include "hasht.h"
 #include "pkcs11t.h"
 #include "blapi.h"
 #include "hasht.h"
 #include "secasn1.h"
 #include "secder.h"
 #include "lowpbe.h"
 #include "secoid.h"
 #include "alghmac.h"
 #include "softoken.h"
 #include "secerr.h"
 SEC_ASN1_MKSUB(SECOID_AlgorithmIDTemplate)
 /* template for PKCS 5 PBE Parameter.  This template has been expanded
  * based upon the additions in PKCS 12.  This should eventually be moved
  * if RSA updates PKCS 5.
  */
 static const SEC_ASN1Template NSSPKCS5PBEParameterTemplate[] =
 {
     { SEC_ASN1_SEQUENCE,
 , NULL, sizeof(NSSPKCS5PBEParameter) },
     { SEC_ASN1_OCTET_STRING,
 	offsetof(NSSPKCS5PBEParameter, salt) },
     { SEC_ASN1_INTEGER,
 	offsetof(NSSPKCS5PBEParameter, iteration) },
     { 0 }
 };
 static const SEC_ASN1Template NSSPKCS5PKCS12V2PBEParameterTemplate[] =
 {
     { SEC_ASN1_SEQUENCE, 0, NULL, sizeof(NSSPKCS5PBEParameter) },
     { SEC_ASN1_OCTET_STRING, offsetof(NSSPKCS5PBEParameter, salt) },
     { SEC_ASN1_INTEGER, offsetof(NSSPKCS5PBEParameter, iteration) },
     { 0 }
 };
 /* PKCS5 v2 */
 struct nsspkcs5V2PBEParameterStr {
     SECAlgorithmID keyParams;  /* parameters of the key generation */
     SECAlgorithmID algParams;  /* parameters for the encryption or mac op */
 };
 typedef struct nsspkcs5V2PBEParameterStr nsspkcs5V2PBEParameter;
 #define PBKDF2
 #ifdef PBKDF2
 static const SEC_ASN1Template NSSPKCS5V2PBES2ParameterTemplate[] =
 {
     { SEC_ASN1_SEQUENCE, 0, NULL, sizeof(nsspkcs5V2PBEParameter) },
     { SEC_ASN1_INLINE | SEC_ASN1_XTRN,
         offsetof(nsspkcs5V2PBEParameter, keyParams),
         SEC_ASN1_SUB(SECOID_AlgorithmIDTemplate) },
     { SEC_ASN1_INLINE | SEC_ASN1_XTRN,
         offsetof(nsspkcs5V2PBEParameter, algParams),
         SEC_ASN1_SUB(SECOID_AlgorithmIDTemplate) },
     { 0 }
 };
 static const SEC_ASN1Template NSSPKCS5V2PBEParameterTemplate[] =
 {
     { SEC_ASN1_SEQUENCE, 0, NULL, sizeof(NSSPKCS5PBEParameter) },
     /* this is really a choice, but since we don't understand any other
      *choice, just inline it. */
     { SEC_ASN1_OCTET_STRING, offsetof(NSSPKCS5PBEParameter, salt) },
     { SEC_ASN1_INTEGER, offsetof(NSSPKCS5PBEParameter, iteration) },
     { SEC_ASN1_INTEGER, offsetof(NSSPKCS5PBEParameter, keyLength) },
     { SEC_ASN1_INLINE | SEC_ASN1_XTRN,
         offsetof(NSSPKCS5PBEParameter, prfAlg),
         SEC_ASN1_SUB(SECOID_AlgorithmIDTemplate) },
     { 0 }
 };
 #endif
 SECStatus
 nsspkcs5_HashBuf(const SECHashObject *hashObj, unsigned char *dest,
 					 unsigned char *src, int len)
 {
     void *ctx;
     unsigned int retLen;
     ctx = hashObj->create();
     if(ctx == NULL) {
 	return SECFailure;
     }
     hashObj->begin(ctx);
     hashObj->update(ctx, src, len);
     hashObj->end(ctx, dest, &retLen, hashObj->length);
     hashObj->destroy(ctx, PR_TRUE);
     return SECSuccess;
 }
 /* generate bits using any hash
  */
 static SECItem *
 nsspkcs5_PBKDF1(const SECHashObject *hashObj, SECItem *salt, SECItem *pwd,
 						int iter, PRBool faulty3DES)
 {
     SECItem *hash = NULL, *pre_hash = NULL;
     SECStatus rv = SECFailure;
     if((salt == NULL) || (pwd == NULL) || (iter < 0)) {
 	return NULL;
     }
     hash = (SECItem *)PORT_ZAlloc(sizeof(SECItem));
     pre_hash = (SECItem *)PORT_ZAlloc(sizeof(SECItem));
     if((hash != NULL) && (pre_hash != NULL)) {
 	int i, ph_len;
 	ph_len = hashObj->length;
 	if((salt->len + pwd->len) > hashObj->length) {
 	    ph_len = salt->len + pwd->len;
 	}
 	rv = SECFailure;
 	/* allocate buffers */
 	hash->len = hashObj->length;
 	hash->data = (unsigned char *)PORT_ZAlloc(hash->len);
 	pre_hash->data = (unsigned char *)PORT_ZAlloc(ph_len);
 	/* in pbeSHA1TripleDESCBC there was an allocation error that made
 	 * it into the caller.  We do not want to propagate those errors
 	 * further, so we are doing it correctly, but reading the old method.
 	 */
 	if (faulty3DES) {
 	    pre_hash->len = ph_len;
 	} else {
 	    pre_hash->len = salt->len + pwd->len;
 	}
 	/* preform hash */
 	if ((hash->data != NULL) && (pre_hash->data != NULL)) {
 	    rv = SECSuccess;
 	    /* check for 0 length password */
 	    if(pwd->len > 0) {
 		PORT_Memcpy(pre_hash->data, pwd->data, pwd->len);
 	    }
 	    if(salt->len > 0) {
 		PORT_Memcpy((pre_hash->data+pwd->len), salt->data, salt->len);
 	    }
 	    for(i = 0; ((i < iter) && (rv == SECSuccess)); i++) {
 		rv = nsspkcs5_HashBuf(hashObj, hash->data,
 					pre_hash->data, pre_hash->len);
 		if(rv != SECFailure) {
 		    pre_hash->len = hashObj->length;
 		    PORT_Memcpy(pre_hash->data, hash->data, hashObj->length);
 		}
 	    }
 	}
     }
     if(pre_hash != NULL) {
 	SECITEM_FreeItem(pre_hash, PR_TRUE);
     }
     if((rv != SECSuccess) && (hash != NULL)) {
 	SECITEM_FreeItem(hash, PR_TRUE);
 	hash = NULL;
     }
     return hash;
 }
 /* this bit generation routine is described in PKCS 12 and the proposed
  * extensions to PKCS 5.  an initial hash is generated following the
  * instructions laid out in PKCS 5.  If the number of bits generated is
  * insufficient, then the method discussed in the proposed extensions to
  * PKCS 5 in PKCS 12 are used.  This extension makes use of the HMAC
  * function.  And the P_Hash function from the TLS standard.
  */
 static SECItem *
 nsspkcs5_PFXPBE(const SECHashObject *hashObj, NSSPKCS5PBEParameter *pbe_param,
 				SECItem *init_hash, unsigned int bytes_needed)
 {
     SECItem *ret_bits = NULL;
     int hash_size = 0;
     unsigned int i;
     unsigned int hash_iter;
     unsigned int dig_len;
     SECStatus rv = SECFailure;
     unsigned char *state = NULL;
     unsigned int state_len;
     HMACContext *cx = NULL;
     hash_size = hashObj->length;
     hash_iter = (bytes_needed + (unsigned int)hash_size - 1) / hash_size;
     /* allocate return buffer */
     ret_bits = (SECItem  *)PORT_ZAlloc(sizeof(SECItem));
     if(ret_bits == NULL)
 	return NULL;
     ret_bits->data = (unsigned char *)PORT_ZAlloc((hash_iter * hash_size) + 1);
     ret_bits->len = (hash_iter * hash_size);
     if(ret_bits->data == NULL) {
 	PORT_Free(ret_bits);
 	return NULL;
     }
     /* allocate intermediate hash buffer.  8 is for the 8 bytes of
      * data which are added based on iteration number
      */
     if ((unsigned int)hash_size > pbe_param->salt.len) {
 	state_len = hash_size;
     } else {
 	state_len = pbe_param->salt.len;
     }
     state = (unsigned char *)PORT_ZAlloc(state_len);
     if(state == NULL) {
 	rv = SECFailure;
 	goto loser;
     }
     if(pbe_param->salt.len > 0) {
 	PORT_Memcpy(state, pbe_param->salt.data, pbe_param->salt.len);
     }
     cx = HMAC_Create(hashObj, init_hash->data, init_hash->len, PR_TRUE);
     if (cx == NULL) {
 	rv = SECFailure;
 	goto loser;
     }
     for(i = 0; i < hash_iter; i++) {
 	/* generate output bits */
 	HMAC_Begin(cx);
 	HMAC_Update(cx, state, state_len);
 	HMAC_Update(cx, pbe_param->salt.data, pbe_param->salt.len);
 	rv = HMAC_Finish(cx, ret_bits->data + (i * hash_size),
 			 &dig_len, hash_size);
 	if (rv != SECSuccess)
 	    goto loser;
 	PORT_Assert((unsigned int)hash_size == dig_len);
 	/* generate new state */
 	HMAC_Begin(cx);
 	HMAC_Update(cx, state, state_len);
 	rv = HMAC_Finish(cx, state, &state_len, state_len);
 	if (rv != SECSuccess)
 	    goto loser;
 	PORT_Assert(state_len == dig_len);
     }
 loser:
     if (state != NULL)
 	PORT_ZFree(state, state_len);
     HMAC_Destroy(cx, PR_TRUE);
     if(rv != SECSuccess) {
 	SECITEM_ZfreeItem(ret_bits, PR_TRUE);
 	ret_bits = NULL;
     }
     return ret_bits;
 }
 /* generate bits for the key and iv determination.  if enough bits
  * are not generated using PKCS 5, then we need to generate more bits
  * based on the extension proposed in PKCS 12
  */
 static SECItem *
 nsspkcs5_PBKDF1Extended(const SECHashObject *hashObj,
 	 NSSPKCS5PBEParameter *pbe_param, SECItem *pwitem, PRBool faulty3DES)
 {
     SECItem * hash 		= NULL;
     SECItem * newHash 		= NULL;
     int       bytes_needed;
     int       bytes_available;
     bytes_needed = pbe_param->ivLen + pbe_param->keyLen;
     bytes_available = hashObj->length;
     hash = nsspkcs5_PBKDF1(hashObj, &pbe_param->salt, pwitem,
 						pbe_param->iter, faulty3DES);
     if(hash == NULL) {
 	return NULL;
     }
     if(bytes_needed <= bytes_available) {
 	return hash;
     }
     newHash = nsspkcs5_PFXPBE(hashObj, pbe_param, hash, bytes_needed);
     if (hash != newHash)
 	SECITEM_FreeItem(hash, PR_TRUE);
     return newHash;
 }
 #ifdef PBKDF2
 /*
  * PBDKDF2 is PKCS #5 v2.0 it's currently not used by NSS
  */
 static void
 do_xor(unsigned char *dest, unsigned char *src, int len)
 {
    /* use byt xor, not all platforms are happy about inaligned
     * integer fetches */
     while (len--) {
     	*dest = *dest ^ *src;
 	dest++;
 	src++;
     }
 }
 static SECStatus
 nsspkcs5_PBKFD2_F(const SECHashObject *hashobj, SECItem *pwitem, SECItem *salt,
 			int iterations, unsigned int i, unsigned char *T)
 {
     int j;
     HMACContext *cx = NULL;
     unsigned int hLen = hashobj->length;
     SECStatus rv = SECFailure;
     unsigned char *last = NULL;
     unsigned int lastLength = salt->len + 4;
     unsigned int lastBufLength;
     cx=HMAC_Create(hashobj,pwitem->data,pwitem->len,PR_FALSE);
     if (cx == NULL) {
 	goto loser;
     }
     PORT_Memset(T,0,hLen);
     lastBufLength = PR_MAX(lastLength, hLen);
     last = PORT_Alloc(lastBufLength);
     if (last == NULL) {
 	goto loser;
     }
     PORT_Memcpy(last,salt->data,salt->len);
     last[salt->len  ] = (i >> 24) & 0xff;
     last[salt->len+1] = (i >> 16) & 0xff;
     last[salt->len+2] = (i >> 8) & 0xff;
     last[salt->len+3] =    i  & 0xff;
     /* NOTE: we need at least one iteration to return success! */
     for (j=0; j < iterations; j++) {
 	HMAC_Begin(cx);
 	HMAC_Update(cx,last,lastLength);
 	rv =HMAC_Finish(cx,last,&lastLength,hLen);
 	if (rv !=SECSuccess) {
 	   break;
 	}
 	do_xor(T,last,hLen);
     }
 loser:
     if (cx) {
 	HMAC_Destroy(cx, PR_TRUE);
     }
     if (last) {
 	PORT_ZFree(last,lastBufLength);
     }
     return rv;
 }
 static SECItem *
 nsspkcs5_PBKDF2(const SECHashObject *hashobj, NSSPKCS5PBEParameter *pbe_param,
 							SECItem *pwitem)
 {
     int iterations = pbe_param->iter;
     int bytesNeeded = pbe_param->keyLen;
     unsigned int dkLen = bytesNeeded;
     unsigned int hLen = hashobj->length;
     unsigned int nblocks = (dkLen+hLen-1) / hLen;
     unsigned int i;
     unsigned char *rp;
     unsigned char *T = NULL;
     SECItem *result = NULL;
     SECItem *salt = &pbe_param->salt;
     SECStatus rv = SECFailure;
     result = SECITEM_AllocItem(NULL,NULL,nblocks*hLen);
     if (result == NULL) {
 	return NULL;
     }
     T = PORT_Alloc(hLen);
     if (T == NULL) {
 	goto loser;
     }
     for (i=1,rp=result->data; i <= nblocks ; i++, rp +=hLen) {
 	rv = nsspkcs5_PBKFD2_F(hashobj,pwitem,salt,iterations,i,T);
 	if (rv != SECSuccess) {
 	    break;
 	}
 	PORT_Memcpy(rp,T,hLen);
     }
 loser:
     if (T) {
 	PORT_ZFree(T,hLen);
     }
     if (rv != SECSuccess) {
 	SECITEM_FreeItem(result,PR_TRUE);
 	result = NULL;
     } else {
 	result->len = dkLen;
     }
     return result;
 }
 #endif
 #define HMAC_BUFFER 64
 #define NSSPBE_ROUNDUP(x,y) ((((x)+((y)-1))/(y))*(y))
 #define NSSPBE_MIN(x,y) ((x) < (y) ? (x) : (y))
 /*
  * This is the extended PBE function defined by the final PKCS #12 spec.
  */
 static SECItem *
 nsspkcs5_PKCS12PBE(const SECHashObject *hashObject,
 		   NSSPKCS5PBEParameter *pbe_param, SECItem *pwitem,
 		   PBEBitGenID bitGenPurpose, unsigned int bytesNeeded)
 {
     PLArenaPool *arena = NULL;
     unsigned int SLen,PLen;
     unsigned int hashLength = hashObject->length;
     unsigned char *S, *P;
     SECItem *A = NULL, B, D, I;
     SECItem *salt = &pbe_param->salt;
     unsigned int c,i = 0;
     unsigned int hashLen;
     int iter;
     unsigned char *iterBuf;
     void *hash = NULL;
     arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
     if(!arena) {
 	return NULL;
     }
     /* how many hash object lengths are needed */
     c = (bytesNeeded + (hashLength-1))/hashLength;
     /* initialize our buffers */
     D.len = HMAC_BUFFER;
     /* B and D are the same length, use one alloc go get both */
     D.data = (unsigned char*)PORT_ArenaZAlloc(arena, D.len*2);
     B.len = D.len;
     B.data = D.data + D.len;
     /* if all goes well, A will be returned, so don't use our temp arena */
     A = SECITEM_AllocItem(NULL,NULL,c*hashLength);
     if (A == NULL) {
 	goto loser;
     }
     SLen = NSSPBE_ROUNDUP(salt->len,HMAC_BUFFER);
     PLen = NSSPBE_ROUNDUP(pwitem->len,HMAC_BUFFER);
     I.len = SLen+PLen;
     I.data = (unsigned char*)PORT_ArenaZAlloc(arena, I.len);
     if (I.data == NULL) {
 	goto loser;
     }
     /* S & P are only used to initialize I */
     S = I.data;
     P = S + SLen;
     PORT_Memset(D.data, (char)bitGenPurpose, D.len);
     if (SLen) {
 	for (i=0; i < SLen; i += salt->len) {
 	    PORT_Memcpy(S+i, salt->data, NSSPBE_MIN(SLen-i,salt->len));
 	}
     }
     if (PLen) {
 	for (i=0; i < PLen; i += pwitem->len) {
 	    PORT_Memcpy(P+i, pwitem->data, NSSPBE_MIN(PLen-i,pwitem->len));
 	}
     }
     iterBuf = (unsigned char*)PORT_ArenaZAlloc(arena,hashLength);
     if (iterBuf == NULL) {
 	goto loser;
     }
     hash = hashObject->create();
     if(!hash) {
 	goto loser;
     }
     /* calculate the PBE now */
     for(i = 0; i < c; i++) {
 	int Bidx;	/* must be signed or the for loop won't terminate */
 	unsigned int k, j;
 	unsigned char *Ai = A->data+i*hashLength;
 	for(iter = 0; iter < pbe_param->iter; iter++) {
 	    hashObject->begin(hash);
 	    if (iter) {
 		hashObject->update(hash, iterBuf, hashLen);
 	    } else {
 		hashObject->update(hash, D.data, D.len);
 		hashObject->update(hash, I.data, I.len);
 	    }
 	    hashObject->end(hash, iterBuf, &hashLen, hashObject->length);
 	    if(hashLen != hashObject->length) {
 		break;
 	    }
 	}
 	PORT_Memcpy(Ai, iterBuf, hashLength);
 	for (Bidx = 0; Bidx < B.len; Bidx += hashLength) {
 	    PORT_Memcpy(B.data+Bidx,iterBuf,NSSPBE_MIN(B.len-Bidx,hashLength));
 	}
 	k = I.len/B.len;
 	for(j = 0; j < k; j++) {
 	    unsigned int q, carryBit;
 	    unsigned char *Ij = I.data + j*B.len;
 	    /* (Ij = Ij+B+1) */
 	    for (Bidx = (B.len-1), q=1, carryBit=0; Bidx >= 0; Bidx--,q=0) {
 		q += (unsigned int)Ij[Bidx];
 		q += (unsigned int)B.data[Bidx];
 		q += carryBit;
 		carryBit = (q > 0xff);
 		Ij[Bidx] = (unsigned char)(q & 0xff);
 	    }
 	}
     }
 loser:
     if (hash) {
     	hashObject->destroy(hash, PR_TRUE);
     }
     if(arena) {
 	PORT_FreeArena(arena, PR_TRUE);
     }
     if (A) {
         /* if i != c, then we didn't complete the loop above and must of failed
          * somwhere along the way */
         if (i != c) {
 	    SECITEM_ZfreeItem(A,PR_TRUE);
 	    A = NULL;
         } else {
     	    A->len = bytesNeeded;
         }
     }
     return A;
 }
 /*
  * generate key as per PKCS 5
  */
 SECItem *
 nsspkcs5_ComputeKeyAndIV(NSSPKCS5PBEParameter *pbe_param, SECItem *pwitem,
 		      SECItem *iv, PRBool faulty3DES)
 {
     SECItem *hash = NULL, *key = NULL;
     const SECHashObject *hashObj;
     PRBool getIV = PR_FALSE;
     if((pbe_param == NULL) || (pwitem == NULL)) {
 	return NULL;
     }
     key = SECITEM_AllocItem(NULL,NULL,pbe_param->keyLen);
     if (key == NULL) {
 	return NULL;
     }
     if (iv && (pbe_param->ivLen) && (iv->data == NULL)) {
 	getIV = PR_TRUE;
     	iv->data = (unsigned char *)PORT_Alloc(pbe_param->ivLen);
     	if (iv->data == NULL) {
 	    goto loser;
 	}
 	iv->len = pbe_param->ivLen;
     }
     hashObj = HASH_GetRawHashObject(pbe_param->hashType);
     switch (pbe_param->pbeType) {
     case NSSPKCS5_PBKDF1:
 	hash = nsspkcs5_PBKDF1Extended(hashObj,pbe_param,pwitem,faulty3DES);
 	if (hash == NULL) {
 	    goto loser;
 	}
 	PORT_Assert(hash->len >= key->len+(getIV ? iv->len : 0));
 	if (getIV) {
 	    PORT_Memcpy(iv->data, hash->data+(hash->len - iv->len),iv->len);
 	}
     	break;
 #ifdef PBKDF2
     case NSSPKCS5_PBKDF2:
 	hash = nsspkcs5_PBKDF2(hashObj,pbe_param,pwitem);
 	if (getIV) {
 	    PORT_Memcpy(iv->data, pbe_param->ivData, iv->len);
 	}
     	break;
 #endif
     case NSSPKCS5_PKCS12_V2:
 	if (getIV) {
 	    hash = nsspkcs5_PKCS12PBE(hashObj,pbe_param,pwitem,
 						pbeBitGenCipherIV,iv->len);
 	    if (hash == NULL) {
 		goto loser;
 	    }
 	    PORT_Memcpy(iv->data,hash->data,iv->len);
 	    SECITEM_ZfreeItem(hash,PR_TRUE);
 	    hash = NULL;
 	}
 	hash = nsspkcs5_PKCS12PBE(hashObj,pbe_param,pwitem,
 						pbe_param->keyID,key->len);
     default:
 	break;
     }
     if (hash == NULL) {
 	goto loser;
     }
     if (pbe_param->is2KeyDES) {
 	PORT_Memcpy(key->data, hash->data, (key->len * 2) / 3);
 	PORT_Memcpy(&(key->data[(key->len  * 2) / 3]), key->data,
 		    key->len / 3);
     } else {
 	PORT_Memcpy(key->data, hash->data, key->len);
     }
     SECITEM_ZfreeItem(hash, PR_TRUE);
     return key;
 loser:
     if (getIV && iv->data) {
 	PORT_ZFree(iv->data,iv->len);
 	iv->data = NULL;
     }
     SECITEM_ZfreeItem(key, PR_TRUE);
     return NULL;
 }
 static SECStatus
 nsspkcs5_FillInParam(SECOidTag algorithm, NSSPKCS5PBEParameter *pbe_param)
 {
     PRBool skipType = PR_FALSE;
     pbe_param->keyLen = 5;
     pbe_param->ivLen = 8;
     pbe_param->hashType = HASH_AlgSHA1;
     pbe_param->pbeType = NSSPKCS5_PBKDF1;
     pbe_param->encAlg = SEC_OID_RC2_CBC;
     pbe_param->is2KeyDES = PR_FALSE;
     switch(algorithm) {
     /* DES3 Algorithms */
     case SEC_OID_PKCS12_V2_PBE_WITH_SHA1_AND_2KEY_TRIPLE_DES_CBC:
 	pbe_param->is2KeyDES = PR_TRUE;
 	/* fall through */
     case SEC_OID_PKCS12_V2_PBE_WITH_SHA1_AND_3KEY_TRIPLE_DES_CBC:
 	pbe_param->pbeType = NSSPKCS5_PKCS12_V2;
 	/* fall through */
     case SEC_OID_PKCS12_PBE_WITH_SHA1_AND_TRIPLE_DES_CBC:
 	pbe_param->keyLen = 24;
 	pbe_param->encAlg = SEC_OID_DES_EDE3_CBC;
 	break;
     /* DES Algorithms */
     case SEC_OID_PKCS5_PBE_WITH_MD2_AND_DES_CBC:
     	pbe_param->hashType = HASH_AlgMD2;
 	goto finish_des;
     case SEC_OID_PKCS5_PBE_WITH_MD5_AND_DES_CBC:
     	pbe_param->hashType = HASH_AlgMD5;
 	/* fall through */
     case SEC_OID_PKCS5_PBE_WITH_SHA1_AND_DES_CBC:
 finish_des:
 	pbe_param->keyLen = 8;
 	pbe_param->encAlg =  SEC_OID_DES_CBC;
 	break;
     /* RC2 Algorithms */
     case SEC_OID_PKCS12_V2_PBE_WITH_SHA1_AND_128_BIT_RC2_CBC:
 	pbe_param->keyLen = 16;
 	/* fall through */
     case SEC_OID_PKCS12_V2_PBE_WITH_SHA1_AND_40_BIT_RC2_CBC:
 	pbe_param->pbeType = NSSPKCS5_PKCS12_V2;
 	break;
     case SEC_OID_PKCS12_PBE_WITH_SHA1_AND_128_BIT_RC2_CBC:
 	pbe_param->keyLen = 16;
 	/* fall through */
     case SEC_OID_PKCS12_PBE_WITH_SHA1_AND_40_BIT_RC2_CBC:
 	break;
     /* RC4 algorithms */
     case SEC_OID_PKCS12_PBE_WITH_SHA1_AND_128_BIT_RC4:
 	skipType = PR_TRUE;
 	/* fall through */
     case SEC_OID_PKCS12_V2_PBE_WITH_SHA1_AND_128_BIT_RC4:
 	pbe_param->keyLen = 16;
 	/* fall through */
     case SEC_OID_PKCS12_V2_PBE_WITH_SHA1_AND_40_BIT_RC4:
 	if (!skipType) {
     	    pbe_param->pbeType = NSSPKCS5_PKCS12_V2;
 	}
 	/* fall through */
     case SEC_OID_PKCS12_PBE_WITH_SHA1_AND_40_BIT_RC4:
         pbe_param->ivLen = 0;
         pbe_param->encAlg =  SEC_OID_RC4;
         break;
 #ifdef PBKDF2
     case SEC_OID_PKCS5_PBKDF2:
     case SEC_OID_PKCS5_PBES2:
     case SEC_OID_PKCS5_PBMAC1:
 	/* everything else will be filled in by the template */
         pbe_param->ivLen = 0;
 	pbe_param->pbeType = NSSPKCS5_PBKDF2;
         pbe_param->encAlg =  SEC_OID_PKCS5_PBKDF2;
 	pbe_param->keyLen = 0; /* needs to be set by caller after return */
 	break;
 #endif
     default:
         return SECFailure;
     }
     return SECSuccess;
 }
 /* decode the algid and generate a PKCS 5 parameter from it
  */
 NSSPKCS5PBEParameter *
 nsspkcs5_NewParam(SECOidTag alg, SECItem *salt, int iterator)
 {
     PLArenaPool *arena = NULL;
     NSSPKCS5PBEParameter *pbe_param = NULL;
     SECStatus rv = SECFailure;
     arena = PORT_NewArena(SEC_ASN1_DEFAULT_ARENA_SIZE);
     if (arena == NULL)
 	return NULL;
     /* allocate memory for the parameter */
     pbe_param = (NSSPKCS5PBEParameter *)PORT_ArenaZAlloc(arena,
 	sizeof(NSSPKCS5PBEParameter));
     if (pbe_param == NULL) {
 	goto loser;
     }
     pbe_param->poolp = arena;
     rv = nsspkcs5_FillInParam(alg, pbe_param);
     if (rv != SECSuccess) {
 	goto loser;
     }
     pbe_param->iter = iterator;
     if (salt) {
 	rv = SECITEM_CopyItem(arena,&pbe_param->salt,salt);
     }
     /* default key gen */
     pbe_param->keyID = pbeBitGenCipherKey;
 loser:
     if (rv != SECSuccess) {
 	PORT_FreeArena(arena, PR_TRUE);
 	pbe_param = NULL;
     }
     return pbe_param;
 }
 /*
  * find the hash type needed to implement a specific HMAC.
  * OID definitions are from pkcs 5 v2.0 and 2.1
  */
 HASH_HashType
 HASH_FromHMACOid(SECOidTag hmac)
 {
     switch (hmac) {
     case SEC_OID_HMAC_SHA1:
     	return HASH_AlgSHA1;
     case SEC_OID_HMAC_SHA256:
     	return HASH_AlgSHA256;
     case SEC_OID_HMAC_SHA384:
     	return HASH_AlgSHA384;
     case SEC_OID_HMAC_SHA512:
     	return HASH_AlgSHA512;
     case SEC_OID_HMAC_SHA224:
     default:
 	break;
     }
     return HASH_AlgNULL;
 }
 /* decode the algid and generate a PKCS 5 parameter from it
  */
 NSSPKCS5PBEParameter *
 nsspkcs5_AlgidToParam(SECAlgorithmID *algid)
 {
     NSSPKCS5PBEParameter *pbe_param = NULL;
     nsspkcs5V2PBEParameter pbev2_param;
     SECOidTag algorithm;
     SECStatus rv = SECFailure;
     if (algid == NULL) {
 	return NULL;
     }
     algorithm = SECOID_GetAlgorithmTag(algid);
     if (algorithm == SEC_OID_UNKNOWN) {
 	goto loser;
     }
     pbe_param = nsspkcs5_NewParam(algorithm, NULL, 1);
     if (pbe_param == NULL) {
 	goto loser;
     }
     /* decode parameter */
     rv = SECFailure;
     switch (pbe_param->pbeType) {
     case NSSPKCS5_PBKDF1:
 	rv = SEC_ASN1DecodeItem(pbe_param->poolp, pbe_param,
 	    NSSPKCS5PBEParameterTemplate, &algid->parameters);
 	break;
     case NSSPKCS5_PKCS12_V2:
 	rv = SEC_ASN1DecodeItem(pbe_param->poolp, pbe_param,
 		NSSPKCS5PKCS12V2PBEParameterTemplate, &algid->parameters);
 	break;
 #ifdef PBKDF2
     case NSSPKCS5_PBKDF2:
 	PORT_Memset(&pbev2_param,0, sizeof(pbev2_param));
 	/* just the PBE */
 	if (algorithm == SEC_OID_PKCS5_PBKDF2) {
 	    rv = SEC_ASN1DecodeItem(pbe_param->poolp, pbe_param,
 		NSSPKCS5V2PBEParameterTemplate, &algid->parameters);
 	} else {
 	    /* PBE data an others */
 	    rv = SEC_ASN1DecodeItem(pbe_param->poolp, &pbev2_param,
 		NSSPKCS5V2PBES2ParameterTemplate, &algid->parameters);
 	    if (rv != SECSuccess) {
 		break;
 	    }
             pbe_param->encAlg = SECOID_GetAlgorithmTag(&pbev2_param.algParams);
 	    rv = SEC_ASN1DecodeItem(pbe_param->poolp, pbe_param,
 		NSSPKCS5V2PBEParameterTemplate,
 		&pbev2_param.keyParams.parameters);
 	    if (rv != SECSuccess) {
 		break;
 	    }
     	    pbe_param->keyLen = DER_GetInteger(&pbe_param->keyLength);
 	}
 	/* we we are encrypting, save any iv's */
 	if (algorithm == SEC_OID_PKCS5_PBES2) {
 	    pbe_param->ivLen = pbev2_param.algParams.parameters.len;
 	    pbe_param->ivData = pbev2_param.algParams.parameters.data;
 	}
 	pbe_param->hashType =
 	    HASH_FromHMACOid(SECOID_GetAlgorithmTag(&pbe_param->prfAlg));
 	if (pbe_param->hashType == HASH_AlgNULL) {
 	    PORT_SetError(SEC_ERROR_INVALID_ALGORITHM);
 	    rv = SECFailure;
 	}
 	break;
 #endif
     }
 loser:
     if (rv == SECSuccess) {
     	pbe_param->iter = DER_GetInteger(&pbe_param->iteration);
     } else {
 	nsspkcs5_DestroyPBEParameter(pbe_param);
 	pbe_param = NULL;
     }
     return pbe_param;
 }
 /* destroy a pbe parameter.  it assumes that the parameter was
  * generated using the appropriate create function and therefor
  * contains an arena pool.
  */
 void
 nsspkcs5_DestroyPBEParameter(NSSPKCS5PBEParameter *pbe_param)
 {
     if (pbe_param != NULL) {
 	PORT_FreeArena(pbe_param->poolp, PR_FALSE);
     }
 }
 /* crypto routines */
 /* perform DES encryption and decryption.  these routines are called
  * by nsspkcs5_CipherData.  In the case of an error, NULL is returned.
  */
 static SECItem *
 sec_pkcs5_des(SECItem *key, SECItem *iv, SECItem *src, PRBool triple_des,
 								PRBool encrypt)
 {
     SECItem *dest;
     SECItem *dup_src;
     SECStatus rv = SECFailure;
     int pad;
     if((src == NULL) || (key == NULL) || (iv == NULL))
 	return NULL;
     dup_src = SECITEM_DupItem(src);
     if(dup_src == NULL) {
 	return NULL;
     }
     if(encrypt != PR_FALSE) {
 	void *dummy;
 	dummy = CBC_PadBuffer(NULL, dup_src->data,
 	    dup_src->len, &dup_src->len, 8 /* DES_BLOCK_SIZE */);
 	if(dummy == NULL) {
 	    SECITEM_FreeItem(dup_src, PR_TRUE);
 	    return NULL;
 	}
 	dup_src->data = (unsigned char*)dummy;
     }
     dest = (SECItem *)PORT_ZAlloc(sizeof(SECItem));
     if(dest != NULL) {
 	/* allocate with over flow */
 	dest->data = (unsigned char *)PORT_ZAlloc(dup_src->len + 64);
 	if(dest->data != NULL) {
 	    DESContext *ctxt;
 	    ctxt = DES_CreateContext(key->data, iv->data,
 			(triple_des ? NSS_DES_EDE3_CBC : NSS_DES_CBC),
 			encrypt);
 	    if(ctxt != NULL) {
 		rv = (encrypt ? DES_Encrypt : DES_Decrypt)(
 			ctxt, dest->data, &dest->len,
 			dup_src->len + 64, dup_src->data, dup_src->len);
 		/* remove padding -- assumes 64 bit blocks */
 		if((encrypt == PR_FALSE) && (rv == SECSuccess)) {
 		    pad = dest->data[dest->len-1];
 		    if((pad > 0) && (pad <= 8)) {
 			if(dest->data[dest->len-pad] != pad) {
 			    rv = SECFailure;
 			    PORT_SetError(SEC_ERROR_BAD_PASSWORD);
 			} else {
 			    dest->len -= pad;
 			}
 		    } else {
 			rv = SECFailure;
 			PORT_SetError(SEC_ERROR_BAD_PASSWORD);
 		    }
 		}
 		DES_DestroyContext(ctxt, PR_TRUE);
 	    }
 	}
     }
     if(rv == SECFailure) {
 	if(dest != NULL) {
 	    SECITEM_FreeItem(dest, PR_TRUE);
 	}
 	dest = NULL;
     }
     if(dup_src != NULL) {
 	SECITEM_FreeItem(dup_src, PR_TRUE);
     }
     return dest;
 }
 /* perform aes encryption/decryption if an error occurs, NULL is returned
  */
 static SECItem *
 sec_pkcs5_aes(SECItem *key, SECItem *iv, SECItem *src, PRBool triple_des,
 								PRBool encrypt)
 {
     SECItem *dest;
     SECItem *dup_src;
     SECStatus rv = SECFailure;
     int pad;
     if((src == NULL) || (key == NULL) || (iv == NULL))
 	return NULL;
     dup_src = SECITEM_DupItem(src);
     if(dup_src == NULL) {
 	return NULL;
     }
     if(encrypt != PR_FALSE) {
 	void *dummy;
 	dummy = CBC_PadBuffer(NULL, dup_src->data,
 	    dup_src->len, &dup_src->len,AES_BLOCK_SIZE);
 	if(dummy == NULL) {
 	    SECITEM_FreeItem(dup_src, PR_TRUE);
 	    return NULL;
 	}
 	dup_src->data = (unsigned char*)dummy;
     }
     dest = (SECItem *)PORT_ZAlloc(sizeof(SECItem));
     if(dest != NULL) {
 	/* allocate with over flow */
 	dest->data = (unsigned char *)PORT_ZAlloc(dup_src->len + 64);
 	if(dest->data != NULL) {
 	    AESContext *ctxt;
 	    ctxt = AES_CreateContext(key->data, iv->data,
 			NSS_AES_CBC, encrypt, key->len, 16);
 	    if(ctxt != NULL) {
 		rv = (encrypt ? AES_Encrypt : AES_Decrypt)(
 			ctxt, dest->data, &dest->len,
 			dup_src->len + 64, dup_src->data, dup_src->len);
 		/* remove padding -- assumes 64 bit blocks */
 		if((encrypt == PR_FALSE) && (rv == SECSuccess)) {
 		    pad = dest->data[dest->len-1];
 		    if((pad > 0) && (pad <= 16)) {
 			if(dest->data[dest->len-pad] != pad) {
 			    rv = SECFailure;
 			    PORT_SetError(SEC_ERROR_BAD_PASSWORD);
 			} else {
 			    dest->len -= pad;
 			}
 		    } else {
 			rv = SECFailure;
 			PORT_SetError(SEC_ERROR_BAD_PASSWORD);
 		    }
 		}
 		AES_DestroyContext(ctxt, PR_TRUE);
 	    }
 	}
     }
     if(rv == SECFailure) {
 	if(dest != NULL) {
 	    SECITEM_FreeItem(dest, PR_TRUE);
 	}
 	dest = NULL;
     }
     if(dup_src != NULL) {
 	SECITEM_FreeItem(dup_src, PR_TRUE);
     }
     return dest;
 }
 /* perform rc2 encryption/decryption if an error occurs, NULL is returned
  */
 static SECItem *
 sec_pkcs5_rc2(SECItem *key, SECItem *iv, SECItem *src, PRBool dummy,
 								PRBool encrypt)
 {
     SECItem *dest;
     SECItem *dup_src;
     SECStatus rv = SECFailure;
     int pad;
     if((src == NULL) || (key == NULL) || (iv == NULL)) {
 	return NULL;
     }
     dup_src = SECITEM_DupItem(src);
     if(dup_src == NULL) {
 	return NULL;
     }
     if(encrypt != PR_FALSE) {
 	void *dummy;
 	dummy = CBC_PadBuffer(NULL, dup_src->data,
 		      dup_src->len, &dup_src->len, 8 /* RC2_BLOCK_SIZE */);
 	if(dummy == NULL) {
 	    SECITEM_FreeItem(dup_src, PR_TRUE);
 	    return NULL;
 	}
 	dup_src->data = (unsigned char*)dummy;
     }
     dest = (SECItem *)PORT_ZAlloc(sizeof(SECItem));
     if(dest != NULL) {
 	dest->data = (unsigned char *)PORT_ZAlloc(dup_src->len + 64);
 	if(dest->data != NULL) {
 	    RC2Context *ctxt;
 	    ctxt = RC2_CreateContext(key->data, key->len, iv->data,
 					 	NSS_RC2_CBC, key->len);
 	    if(ctxt != NULL) {
 		rv = (encrypt ? RC2_Encrypt: RC2_Decrypt)(
 			ctxt, dest->data, &dest->len,
 			dup_src->len + 64, dup_src->data, dup_src->len);
 		/* assumes 8 byte blocks  -- remove padding */
 		if((rv == SECSuccess) && (encrypt != PR_TRUE)) {
 		    pad = dest->data[dest->len-1];
 		    if((pad > 0) && (pad <= 8)) {
 			if(dest->data[dest->len-pad] != pad) {
 			    PORT_SetError(SEC_ERROR_BAD_PASSWORD);
 			    rv = SECFailure;
 			} else {
 			    dest->len -= pad;
 			}
 		    } else {
 			PORT_SetError(SEC_ERROR_BAD_PASSWORD);
 			rv = SECFailure;
 		    }
 		}
 	    }
 	}
     }
     if((rv != SECSuccess) && (dest != NULL)) {
 	SECITEM_FreeItem(dest, PR_TRUE);
 	dest = NULL;
     }
     if(dup_src != NULL) {
 	SECITEM_FreeItem(dup_src, PR_TRUE);
     }
     return dest;
 }
 /* perform rc4 encryption and decryption */
 static SECItem *
 sec_pkcs5_rc4(SECItem *key, SECItem *iv, SECItem *src, PRBool dummy_op,
 								 PRBool encrypt)
 {
     SECItem *dest;
     SECStatus rv = SECFailure;
     if((src == NULL) || (key == NULL) || (iv == NULL)) {
 	return NULL;
     }
     dest = (SECItem *)PORT_ZAlloc(sizeof(SECItem));
     if(dest != NULL) {
 	dest->data = (unsigned char *)PORT_ZAlloc(sizeof(unsigned char) *
 	    (src->len + 64));
 	if(dest->data != NULL) {
 	    RC4Context *ctxt;
 	    ctxt = RC4_CreateContext(key->data, key->len);
 	    if(ctxt) {
 		rv = (encrypt ? RC4_Encrypt : RC4_Decrypt)(
 				ctxt, dest->data, &dest->len,
 				src->len + 64, src->data, src->len);
 		RC4_DestroyContext(ctxt, PR_TRUE);
 	    }
 	}
     }
     if((rv != SECSuccess) && (dest)) {
 	SECITEM_FreeItem(dest, PR_TRUE);
 	dest = NULL;
     }
     return dest;
 }
 /* function pointer template for crypto functions */
 typedef SECItem *(* pkcs5_crypto_func)(SECItem *key, SECItem *iv,
                                          SECItem *src, PRBool op1, PRBool op2);
 /* performs the cipher operation on the src and returns the result.
  * if an error occurs, NULL is returned.
  *
  * a null length password is allowed.  this corresponds to encrypting
  * the data with ust the salt.
  */
 /* change this to use PKCS 11? */
 SECItem *
 nsspkcs5_CipherData(NSSPKCS5PBEParameter *pbe_param, SECItem *pwitem,
 		    SECItem *src, PRBool encrypt, PRBool *update)
 {
     SECItem *key = NULL, iv;
     SECItem *dest = NULL;
     PRBool tripleDES = PR_TRUE;
     pkcs5_crypto_func cryptof;
     iv.data = NULL;
     if (update) {
         *update = PR_FALSE;
     }
     if ((pwitem == NULL) || (src == NULL)) {
 	return NULL;
     }
     /* get key, and iv */
     key = nsspkcs5_ComputeKeyAndIV(pbe_param, pwitem, &iv, PR_FALSE);
     if(key == NULL) {
 	return NULL;
     }
     switch(pbe_param->encAlg) {
     /* PKCS 5 v2 only */
     case SEC_OID_AES_128_CBC:
     case SEC_OID_AES_192_CBC:
     case SEC_OID_AES_256_CBC:
 	cryptof = sec_pkcs5_aes;
 	break;
     case SEC_OID_DES_EDE3_CBC:
 	cryptof = sec_pkcs5_des;
 	tripleDES = PR_TRUE;
 	break;
     case SEC_OID_DES_CBC:
 	cryptof = sec_pkcs5_des;
 	tripleDES = PR_FALSE;
 	break;
     case SEC_OID_RC2_CBC:
 	cryptof = sec_pkcs5_rc2;
 	break;
     case SEC_OID_RC4:
 	cryptof = sec_pkcs5_rc4;
 	break;
     default:
 	cryptof = NULL;
 	break;
     }
     if (cryptof == NULL) {
 	goto loser;
     }
     dest = (*cryptof)(key, &iv, src, tripleDES, encrypt);
     /*
      * it's possible for some keys and keydb's to claim to
      * be triple des when they're really des. In this case
      * we simply try des. If des works we set the update flag
      * so the key db knows it needs to update all it's entries.
      *  The case can only happen on decrypted of a
      *  SEC_OID_DES_EDE3_CBD.
      */
     if ((dest == NULL) && (encrypt == PR_FALSE) &&
 				(pbe_param->encAlg == SEC_OID_DES_EDE3_CBC)) {
 	dest = (*cryptof)(key, &iv, src, PR_FALSE, encrypt);
 	if (update && (dest != NULL)) *update = PR_TRUE;
     }
 loser:
     if (key != NULL) {
 	SECITEM_ZfreeItem(key, PR_TRUE);
     }
     if (iv.data != NULL) {
 	SECITEM_ZfreeItem(&iv, PR_FALSE);
     }
     return dest;
 }
 /* creates a algorithm ID containing the PBE algorithm and appropriate
  * parameters.  the required parameter is the algorithm.  if salt is
  * not specified, it is generated randomly.  if IV is specified, it overrides
  * the PKCS 5 generation of the IV.
  *
  * the returned SECAlgorithmID should be destroyed using
  * SECOID_DestroyAlgorithmID
  */
 SECAlgorithmID *
 nsspkcs5_CreateAlgorithmID(PLArenaPool *arena, SECOidTag algorithm,
 					NSSPKCS5PBEParameter *pbe_param)
 {
     SECAlgorithmID *algid, *ret_algid = NULL;
     SECItem der_param;
     nsspkcs5V2PBEParameter pkcs5v2_param;
     SECStatus rv = SECFailure;
     void *dummy = NULL;
     if (arena == NULL) {
 	return NULL;
     }
     der_param.data = NULL;
     der_param.len = 0;
     /* generate the algorithm id */
     algid = (SECAlgorithmID *)PORT_ArenaZAlloc(arena, sizeof(SECAlgorithmID));
     if (algid == NULL) {
 	goto loser;
     }
     if (pbe_param->iteration.data == NULL) {
 	dummy = SEC_ASN1EncodeInteger(pbe_param->poolp,&pbe_param->iteration,
 								pbe_param->iter);
 	if (dummy == NULL) {
 	    goto loser;
 	}
     }
     switch (pbe_param->pbeType) {
     case NSSPKCS5_PBKDF1:
 	dummy = SEC_ASN1EncodeItem(arena, &der_param, pbe_param,
 					NSSPKCS5PBEParameterTemplate);
 	break;
     case NSSPKCS5_PKCS12_V2:
 	dummy = SEC_ASN1EncodeItem(arena, &der_param, pbe_param,
 	    				NSSPKCS5PKCS12V2PBEParameterTemplate);
 	break;
 #ifdef PBKDF2
     case NSSPKCS5_PBKDF2:
         if (pbe_param->keyLength.data == NULL) {
 	    dummy = SEC_ASN1EncodeInteger(pbe_param->poolp,
 				&pbe_param->keyLength, pbe_param->keyLen);
 	    if (dummy == NULL) {
 		goto loser;
 	    }
 	}
 	PORT_Memset(&pkcs5v2_param, 0, sizeof(pkcs5v2_param));
 	dummy = SEC_ASN1EncodeItem(arena, &der_param, pbe_param,
 	    				NSSPKCS5V2PBEParameterTemplate);
 	if (dummy == NULL) {
 	    break;
 	}
 	dummy = NULL;
 	rv = SECOID_SetAlgorithmID(arena, &pkcs5v2_param.keyParams,
 				  SEC_OID_PKCS5_PBKDF2, &der_param);
 	if (rv != SECSuccess) {
 	    break;
 	}
 	der_param.data = pbe_param->ivData;
 	der_param.len = pbe_param->ivLen;
 	rv = SECOID_SetAlgorithmID(arena, &pkcs5v2_param.algParams,
 		pbe_param->encAlg, pbe_param->ivLen ? &der_param : NULL);
 	if (rv != SECSuccess) {
 	    break;
 	}
 	dummy = SEC_ASN1EncodeItem(arena,  &der_param, &pkcs5v2_param,
 	    				NSSPKCS5V2PBES2ParameterTemplate);
 	break;
 #endif
     default:
 	break;
     }
     if (dummy == NULL) {
 	goto loser;
     }
     rv = SECOID_SetAlgorithmID(arena, algid, algorithm, &der_param);
     if (rv != SECSuccess) {
 	goto loser;
     }
     ret_algid = (SECAlgorithmID *)PORT_ZAlloc(sizeof(SECAlgorithmID));
     if (ret_algid == NULL) {
 	goto loser;
     }
     rv = SECOID_CopyAlgorithmID(NULL, ret_algid, algid);
     if (rv != SECSuccess) {
 	SECOID_DestroyAlgorithmID(ret_algid, PR_TRUE);
 	ret_algid = NULL;
     }
 loser:
     return ret_algid;
 }

The Tor Browser / annotate

security/nss/lib/softoken/lowpbe.c@6474c204b198 (annotated)

security/nss/lib/softoken/lowpbe.c