Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 1 | /* |
Alexandre Lision | ddd731e | 2014-01-31 11:50:08 -0500 | [diff] [blame] | 2 | Copyright (C) 2006-2011 Werner Dittmann |
Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 3 | |
| 4 | This program is free software: you can redistribute it and/or modify |
Alexandre Lision | ddd731e | 2014-01-31 11:50:08 -0500 | [diff] [blame] | 5 | it under the terms of the GNU General Public License as published by |
Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 6 | the Free Software Foundation, either version 3 of the License, or |
| 7 | (at your option) any later version. |
| 8 | |
| 9 | This program is distributed in the hope that it will be useful, |
| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | GNU General Public License for more details. |
| 13 | |
| 14 | You should have received a copy of the GNU General Public License |
| 15 | along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 16 | */ |
| 17 | |
| 18 | #ifndef _ZRTPPACKETSASRELAY_H_ |
| 19 | #define _ZRTPPACKETSASRELAY_H_ |
| 20 | |
| 21 | /** |
| 22 | * @file ZrtpPacketSASrelay.h |
| 23 | * @brief The ZRTP SAS Relay message |
| 24 | * |
| 25 | * @ingroup GNU_ZRTP |
| 26 | * @{ |
| 27 | */ |
| 28 | |
| 29 | #include <libzrtpcpp/ZrtpPacketBase.h> |
| 30 | |
| 31 | /** |
| 32 | * Implement the Confirm packet. |
| 33 | * |
| 34 | * The ZRTP message Confirm. The implementation sends this |
| 35 | * to confirm the switch to SRTP (encrypted) mode. The contents of |
| 36 | * the Confirm message are encrypted, thus the implementation |
| 37 | * can check if the secret keys work. |
| 38 | * |
| 39 | * @author Werner Dittmann <Werner.Dittmann@t-online.de> |
| 40 | */ |
| 41 | |
| 42 | class __EXPORT ZrtpPacketSASrelay : public ZrtpPacketBase { |
| 43 | |
| 44 | private: |
| 45 | SASrelay_t* sasRelayHeader; ///< Point to the Confirm message part |
| 46 | |
| 47 | public: |
| 48 | /// Creates a Confirm packet with default data |
| 49 | ZrtpPacketSASrelay(); |
| 50 | |
| 51 | /// Creates a Confirm packet with default data and a given signature length |
| 52 | ZrtpPacketSASrelay(uint32_t sl); |
| 53 | |
| 54 | /// Creates a Confirm packet from received data |
| 55 | ZrtpPacketSASrelay(uint8_t* d); |
| 56 | |
| 57 | /// Normal destructor |
| 58 | virtual ~ZrtpPacketSASrelay(); |
| 59 | |
| 60 | /// Check is SAS verify flag is set |
| 61 | const bool isSASFlag() { return sasRelayHeader->flags & 0x4; } |
| 62 | |
| 63 | /// Get pointer to filler bytes (contains one bit of signature length) |
| 64 | const uint8_t* getFiller() { return sasRelayHeader->filler; } |
| 65 | |
| 66 | /// Get pointer to IV data, fixed byte array |
| 67 | const uint8_t* getIv() { return sasRelayHeader->iv; } |
| 68 | |
| 69 | /// Get pointer to MAC data, fixed byte array |
| 70 | const uint8_t* getHmac() { return sasRelayHeader->hmac; } |
| 71 | |
| 72 | /// Get pointer to new SAS rendering algorithm, fixed byte array |
Alexandre Lision | 7fd5d3d | 2013-12-04 13:06:40 -0500 | [diff] [blame] | 73 | const uint8_t* getSasAlgo() {return sasRelayHeader->sas; } |
Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 74 | |
| 75 | /// Get pointer to new SAS hash data, fixed byte array |
Alexandre Lision | ddd731e | 2014-01-31 11:50:08 -0500 | [diff] [blame] | 76 | const uint8_t* getTrustedSas() { return sasRelayHeader->trustedSasHash; } |
Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 77 | |
| 78 | /// get the signature length in words |
| 79 | uint32_t getSignatureLength(); |
| 80 | |
| 81 | /// set SAS verified flag |
| 82 | void setSASFlag() { sasRelayHeader->flags |= 0x4; } |
| 83 | |
| 84 | /// Set MAC data, fixed length byte array |
| 85 | void setHmac(uint8_t* text) { memcpy(sasRelayHeader->hmac, text, sizeof(sasRelayHeader->hmac)); } |
| 86 | |
| 87 | /// Set IV data, fixed length byte array |
| 88 | void setIv(uint8_t* text) { memcpy(sasRelayHeader->iv, text, sizeof(sasRelayHeader->iv)); } |
| 89 | |
| 90 | /// Set SAS rendering algorithm, fixed length byte array |
Alexandre Lision | 7fd5d3d | 2013-12-04 13:06:40 -0500 | [diff] [blame] | 91 | void setSasAlgo(uint8_t* text) { memcpy(sasRelayHeader->sas, text, sizeof(sasRelayHeader->sas)); } |
Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 92 | |
| 93 | /// Set SAS hash data, fixed length byte array |
| 94 | void setTrustedSas(uint8_t* text) { memcpy(sasRelayHeader->trustedSasHash, text, sizeof(sasRelayHeader->trustedSasHash)); } |
| 95 | |
| 96 | /// Set signature length in words |
| 97 | void setSignatureLength(uint32_t sl); |
| 98 | |
| 99 | private: |
| 100 | void initialize(); |
| 101 | // Confirm packet is of variable length. It maximum size is 524 words: |
| 102 | // - 11 words fixed size |
| 103 | // - up to 513 words variable part, depending if signature is present and its length. |
| 104 | // This leads to a maximum of 4*524=2096 bytes. |
| 105 | uint8_t data[2100]; // large enough to hold a full blown Confirm packet |
| 106 | |
| 107 | }; |
| 108 | |
| 109 | /** |
| 110 | * @} |
| 111 | */ |
| 112 | #endif // ZRTPPACKETSASRELAY |
| 113 | |