sec/Security/SecOTRSessionPriv.h

   1 //
   2 //  SecOTRSessionPriv.h
   3 //  libsecurity_libSecOTR
   4 //
   5 //  Created by Mitch Adler on 2/23/11.
   6 //  Copyright 2011 Apple Inc. All rights reserved.
   7 //
   8
   9 #ifndef _SECOTRSESSIONPRIV_H_
  10 #define _SECOTRSESSIONPRIV_H_
  11
  12 #include <CoreFoundation/CFBase.h>
  13 #include <CoreFoundation/CFRuntime.h>
  14
  15 #include <Security/SecOTR.h>
  16 #include <corecrypto/ccn.h>
  17 #include <corecrypto/ccmode.h>
  18 #include <corecrypto/ccsha1.h>
  19
  20 #include <CommonCrypto/CommonDigest.h>
  21
  22 #include <dispatch/dispatch.h>
  23
  24 #include <Security/SecOTRMath.h>
  25 #include <Security/SecOTRDHKey.h>
  26
  27 __BEGIN_DECLS
  28
  29 typedef enum {
  30     kIdle,
  31     kAwaitingDHKey,
  32     kAwaitingRevealSignature,
  33     kAwaitingSignature,
  34     kDone
  35 } SecOTRAuthState;
  36
  37 struct _SecOTRCacheElement {
  38     SecOTRFullDHKeyRef _fullKey;
  39     uint8_t _fullKeyHash[CCSHA1_OUTPUT_SIZE];
  40     SecOTRPublicDHKeyRef _publicKey;
  41     uint8_t _publicKeyHash[CCSHA1_OUTPUT_SIZE];
  42
  43     uint8_t _sendMacKey[kOTRMessageMacKeyBytes];
  44     uint8_t _sendEncryptionKey[kOTRMessageKeyBytes];
  45
  46     uint8_t _receiveMacKey[kOTRMessageMacKeyBytes];
  47     uint8_t _receiveEncryptionKey[kOTRMessageKeyBytes];
  48
  49     uint64_t _counter;
  50     uint64_t _theirCounter;
  51
  52 };
  53 typedef struct _SecOTRCacheElement SecOTRCacheElement;
  54
  55 #define kOTRKeyCacheSize 4
  56
  57 struct _SecOTRSession {
  58     CFRuntimeBase _base;
  59
  60     SecOTRAuthState _state;
  61
  62     SecOTRFullIdentityRef    _me;
  63     SecOTRPublicIdentityRef  _them;
  64
  65     uint8_t _r[kOTRAuthKeyBytes];
  66
  67     CFDataRef _receivedDHMessage;
  68     CFDataRef _receivedDHKeyMessage;
  69
  70     uint32_t _keyID;
  71     SecOTRFullDHKeyRef _myKey;
  72     SecOTRFullDHKeyRef _myNextKey;
  73
  74     uint32_t _theirKeyID;
  75     SecOTRPublicDHKeyRef _theirPreviousKey;
  76     SecOTRPublicDHKeyRef _theirKey;
  77
  78     CFMutableDataRef _macKeysToExpose;
  79
  80     dispatch_queue_t _queue;
  81
  82     SecOTRCacheElement _keyCache[kOTRKeyCacheSize];
  83
  84     bool _textOutput;
  85 };
  86
  87 void SecOTRGetIncomingBytes(CFDataRef incomingMessage, CFMutableDataRef decodedBytes);
  88 void SecOTRPrepareOutgoingBytes(CFMutableDataRef destinationMessage, CFMutableDataRef protectedMessage);
  89
  90 __END_DECLS
  91
  92 #endif