+++ /dev/null
-/*
- * Copyright (c) 2011-2012,2014 Apple Inc. All Rights Reserved.
- *
- * @APPLE_LICENSE_HEADER_START@
- *
- * This file contains Original Code and/or Modifications of Original Code
- * as defined in and that are subject to the Apple Public Source License
- * Version 2.0 (the 'License'). You may not use this file except in
- * compliance with the License. Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this
- * file.
- *
- * The Original Code and all software distributed under the License are
- * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
- * Please see the License for the specific language governing rights and
- * limitations under the License.
- *
- * @APPLE_LICENSE_HEADER_END@
- */
-
-
-#include "SecOTRMath.h"
-
-#include "SecOTRPacketData.h"
-
-#include <AssertMacros.h>
-
-#include <pthread.h>
-
-#include <Security/SecRandom.h>
-
-#include <corecrypto/ccsha2.h>
-#include <corecrypto/cczp.h>
-#include <corecrypto/ccdh_gp.h>
-
-#include <limits.h>
-
-void OTRExponentiate(cc_unit* res, const cc_unit* base, const cc_unit* exponent)
-{
- ccdh_const_gp_t gp = ccdh_gp_rfc3526group05();
- cczp_power(gp.zp, res, base, exponent);
-}
-
-void OTRGroupExponentiate(cc_unit* res, const cc_unit* exponent)
-{
- OTRExponentiate(res, ccdh_gp_g(ccdh_gp_rfc3526group05()) , exponent);
-}
-
-//
-// Random Number Generation
-//
-
-OSStatus GetRandomBytesInLSBs(size_t bytesOfRandomness, size_t n, cc_unit* place)
-{
- OSStatus result = errSecParam;
- require(bytesOfRandomness * 8 <= ccn_bitsof_n(n), fail);
- {
- uint8_t randomBytes[bytesOfRandomness];
-
- result = SecRandomCopyBytes(kSecRandomDefault, sizeof(randomBytes), randomBytes);
-
- require_noerr(result, fail);
-
- ccn_read_uint(n, place, sizeof(randomBytes), randomBytes);
-
- bzero(randomBytes, bytesOfRandomness);
- }
-fail:
- return result;
-}
-
-OSStatus FillWithRandomBytes(size_t n, cc_unit* place)
-{
- return GetRandomBytesInLSBs(ccn_sizeof(n), n, place);
-}
-
-
-static const uint8_t kIVZero[16] = { };
-
-static void AES_CTR_Transform(size_t keySize, const uint8_t* key,
- const uint8_t iv[16],
- size_t howMuch, const uint8_t* from, uint8_t* to)
-{
- const struct ccmode_ctr* ctr_encrypt = ccaes_ctr_crypt_mode();
- ccctr_ctx_decl(ctr_encrypt->size, ctr_ctx);
- ctr_encrypt->init(ctr_encrypt, ctr_ctx, keySize, key, iv);
-
- ctr_encrypt->ctr(ctr_ctx, howMuch, from, to);
-}
-
-void AES_CTR_HighHalf_Transform(size_t keySize, const uint8_t* key,
- uint64_t highHalf,
- size_t howMuch, const uint8_t* from, uint8_t* to)
-{
- uint8_t iv[16] = { highHalf >> 56, highHalf >> 48, highHalf >> 40, highHalf >> 32,
- highHalf >> 24, highHalf >> 16, highHalf >> 8 , highHalf >> 0,
- 0, 0, 0, 0,
- 0, 0, 0, 0 };
- AES_CTR_Transform(keySize, key, iv, howMuch, from, to);
-}
-
-void AES_CTR_IV0_Transform(size_t keySize, const uint8_t* key,
- size_t howMuch, const uint8_t* from, uint8_t* to)
-{
- AES_CTR_Transform(keySize, key, kIVZero, howMuch, from, to);
-}
-
-
-//
-// Key Derivation
-//
-
-static void HashMPIWithPrefix(uint8_t byte, cc_size sN, const cc_unit* s, uint8_t* buffer)
-{
- CFMutableDataRef dataToHash = CFDataCreateMutable(kCFAllocatorDefault, 0);
- CFDataAppendBytes(dataToHash, &byte, 1);
-
- AppendMPI(dataToHash, sN, s);
-
- uint8_t *bytesToHash = CFDataGetMutableBytePtr(dataToHash);
- CFIndex amountToHash = CFDataGetLength(dataToHash);
-
- /* 64 bits cast: amountToHash is the size of an identity +1 , which is currently hardcoded and never more than 2^32 bytes */
- assert((unsigned long)amountToHash<UINT32_MAX); /* Debug check, Correct as long as CFIndex is a signed long and CC_LONG is a uint32_t */
-
- (void) CC_SHA256(bytesToHash, (CC_LONG)amountToHash, buffer);
-
- bzero(bytesToHash, (size_t)amountToHash);
- CFReleaseNull(dataToHash);
-}
-
-void DeriveOTR256BitsFromS(KeyType whichKey, cc_size sN, const cc_unit* s, size_t keySize, uint8_t* key)
-{
- HashMPIWithPrefix(whichKey, sN, s, key);
-}
-
-void DeriveOTR128BitPairFromS(KeyType whichKey, size_t sSize, const cc_unit* s,
- size_t firstKeySize, uint8_t* firstKey,
- size_t secondKeySize, uint8_t* secondKey)
-{
- uint8_t hashBuffer[CCSHA256_OUTPUT_SIZE];
-
- HashMPIWithPrefix(whichKey, sSize, s, hashBuffer);
-
- if (firstKey) {
- firstKeySize = firstKeySize > CCSHA256_OUTPUT_SIZE/2 ? CCSHA256_OUTPUT_SIZE/2 : firstKeySize;
- memcpy(firstKey, hashBuffer, firstKeySize);
- }
- if (secondKey) {
- secondKeySize = secondKeySize > CCSHA256_OUTPUT_SIZE/2 ? CCSHA256_OUTPUT_SIZE/2 : secondKeySize;
- memcpy(secondKey, hashBuffer, secondKeySize);
- }
-
- bzero(hashBuffer, CCSHA256_OUTPUT_SIZE);
-
-}
-
-void DeriveOTR64BitsFromS(KeyType whichKey, size_t sn, const cc_unit* s,
- size_t topKeySize, uint8_t* topKey)
-{
- uint8_t hashBuffer[CCSHA256_OUTPUT_SIZE];
-
- HashMPIWithPrefix(whichKey, sn, s, hashBuffer);
-
- topKeySize = topKeySize > CCSHA256_OUTPUT_SIZE/2 ? CCSHA256_OUTPUT_SIZE/2 : topKeySize;
- memcpy(topKey, hashBuffer, topKeySize);
-
- bzero(hashBuffer, CCSHA256_OUTPUT_SIZE);
-}
-
projects / apple / security.git / blobdiff