| /* |
| Copyright (C) 2006-2013 Werner Dittmann |
| |
| This program is free software: you can redistribute it and/or modify |
| it under the terms of the GNU Lesser General Public License as published by |
| the Free Software Foundation, either version 3 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program. If not, see <http://www.gnu.org/licenses/>. |
| */ |
| |
| #ifndef _ZRTPPACKETSASRELAY_H_ |
| #define _ZRTPPACKETSASRELAY_H_ |
| |
| /** |
| * @file ZrtpPacketSASrelay.h |
| * @brief The ZRTP SAS Relay message |
| * |
| * @ingroup GNU_ZRTP |
| * @{ |
| */ |
| |
| #include <libzrtpcpp/ZrtpPacketBase.h> |
| |
| /** |
| * Implement the Confirm packet. |
| * |
| * The ZRTP message Confirm. The implementation sends this |
| * to confirm the switch to SRTP (encrypted) mode. The contents of |
| * the Confirm message are encrypted, thus the implementation |
| * can check if the secret keys work. |
| * |
| * @author Werner Dittmann <Werner.Dittmann@t-online.de> |
| */ |
| |
| class __EXPORT ZrtpPacketSASrelay : public ZrtpPacketBase { |
| |
| private: |
| SASrelay_t* sasRelayHeader; ///< Point to the Confirm message part |
| |
| public: |
| /// Creates a Confirm packet with default data |
| ZrtpPacketSASrelay(); |
| |
| /// Creates a Confirm packet with default data and a given signature length |
| ZrtpPacketSASrelay(uint32_t sl); |
| |
| /// Creates a Confirm packet from received data |
| ZrtpPacketSASrelay(uint8_t* d); |
| |
| /// Normal destructor |
| virtual ~ZrtpPacketSASrelay(); |
| |
| /// Check is SAS verify flag is set |
| const bool isSASFlag() { return sasRelayHeader->flags & 0x4; } |
| |
| /// Get pointer to filler bytes (contains one bit of signature length) |
| const uint8_t* getFiller() { return sasRelayHeader->filler; } |
| |
| /// Get pointer to IV data, fixed byte array |
| const uint8_t* getIv() { return sasRelayHeader->iv; } |
| |
| /// Get pointer to MAC data, fixed byte array |
| const uint8_t* getHmac() { return sasRelayHeader->hmac; } |
| |
| /// Get pointer to new SAS rendering algorithm, fixed byte array |
| const uint8_t* getSasAlgo() {return sasRelayHeader->sas; } |
| |
| /// Get pointer to new SAS hash data, fixed byte array |
| const uint8_t* getTrustedSas() { return sasRelayHeader->trustedSasHash; } |
| |
| /// get the signature length in words |
| uint32_t getSignatureLength(); |
| |
| /// Check if packet length makes sense. SAS rely packets are 19 words at minumum, they are similar to Confirm |
| bool isLengthOk() {return (getLength() >= 19);} |
| |
| /// set SAS verified flag |
| void setSASFlag() { sasRelayHeader->flags |= 0x4; } |
| |
| /// Set MAC data, fixed length byte array |
| void setHmac(uint8_t* text) { memcpy(sasRelayHeader->hmac, text, sizeof(sasRelayHeader->hmac)); } |
| |
| /// Set IV data, fixed length byte array |
| void setIv(uint8_t* text) { memcpy(sasRelayHeader->iv, text, sizeof(sasRelayHeader->iv)); } |
| |
| /// Set SAS rendering algorithm, fixed length byte array |
| void setSasAlgo(uint8_t* text) { memcpy(sasRelayHeader->sas, text, sizeof(sasRelayHeader->sas)); } |
| |
| /// Set SAS hash data, fixed length byte array |
| void setTrustedSas(uint8_t* text) { memcpy(sasRelayHeader->trustedSasHash, text, sizeof(sasRelayHeader->trustedSasHash)); } |
| |
| /// Set signature length in words |
| void setSignatureLength(uint32_t sl); |
| |
| private: |
| void initialize(); |
| // Confirm packet is of variable length. It maximum size is 524 words: |
| // - 11 words fixed size |
| // - up to 513 words variable part, depending if signature is present and its length. |
| // This leads to a maximum of 4*524=2096 bytes. |
| uint8_t data[2100]; // large enough to hold a full blown Confirm packet |
| |
| }; |
| |
| /** |
| * @} |
| */ |
| #endif // ZRTPPACKETSASRELAY |
| |