OSX/sec/Security/SecOTRMath.h

   1 /*
   2  * Copyright (c) 2011-2012,2014 Apple Inc. All Rights Reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24
  25 #ifndef _SECOTRMATH_H_
  26 #define _SECOTRMATH_H_
  27
  28 #include <CoreFoundation/CFBase.h>
  29
  30 #include <corecrypto/ccn.h>
  31 #include <corecrypto/ccaes.h>
  32 #include <corecrypto/ccmode.h>
  33
  34 #define kOTRAuthKeyBytes 16
  35 #define kOTRAuthMACKeyBytes 32
  36
  37 #define kOTRMessageKeyBytes 16
  38 #define kOTRMessageMacKeyBytes 20
  39
  40 #define kExponentiationBits 1536
  41 #define kExponentiationUnits ccn_nof(kExponentiationBits)
  42 #define kExponentiationBytes ((kExponentiationBits+7)/8)
  43
  44 #define kSHA256HMAC160Bits  160
  45 #define kSHA256HMAC160Bytes (kSHA256HMAC160Bits/8)
  46
  47 // Result and exponent are expected to be kExponentiationUnits big.
  48 void OTRExponentiate(cc_unit* res, const cc_unit* base, const cc_unit* exponent);
  49 void OTRGroupExponentiate(cc_unit* result, const cc_unit* exponent);
  50
  51 OSStatus GetRandomBytesInLSBs(size_t bytesOfRandomness, size_t n, cc_unit* place);
  52 OSStatus FillWithRandomBytes(size_t n, cc_unit* place);
  53
  54 typedef enum {
  55     kSSID = 0x00,
  56     kCs = 0x01,
  57     kM1 = 0x02,
  58     kM2 = 0x03,
  59     kM1Prime = 0x04,
  60     kM2Prime = 0x05
  61 } KeyType;
  62
  63
  64 void DeriveOTR256BitsFromS(KeyType whichKey, size_t sSize, const cc_unit* s, size_t keySize, uint8_t* key);
  65 void DeriveOTR128BitPairFromS(KeyType whichHalf, size_t sSize, const cc_unit* s,
  66                               size_t firstKeySize, uint8_t* firstKey,
  67                               size_t secondKeySize, uint8_t* secondKey);
  68 void DeriveOTR64BitsFromS(KeyType whichKey, size_t sSize, const cc_unit* s,
  69                           size_t firstKeySize, uint8_t* firstKey);
  70
  71
  72 void AES_CTR_HighHalf_Transform(size_t keySize, const uint8_t* key,
  73                                 uint64_t highHalf,
  74                                 size_t howMuch, const uint8_t* from,
  75                                 uint8_t* to);
  76
  77 void AES_CTR_IV0_Transform(size_t keySize, const uint8_t* key,
  78                            size_t howMuch, const uint8_t* from,
  79                            uint8_t* to);
  80
  81 #endif