| /* |
| 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 _ZRTPPACKETCONFIRM_H_ |
| #define _ZRTPPACKETCONFIRM_H_ |
| |
| /** |
| * @file ZrtpPacketConfirm.h |
| * @brief The ZRTP Confirm 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 ZrtpPacketConfirm : public ZrtpPacketBase { |
| |
| private: |
| Confirm_t* confirmHeader; ///< Point to the Confirm message part |
| |
| public: |
| /// Creates a Confirm packet with default data |
| ZrtpPacketConfirm(); |
| |
| /// Creates a Confirm packet with default data and a given signature length |
| ZrtpPacketConfirm(uint32_t sl); |
| |
| /// Creates a Confirm packet from received data |
| ZrtpPacketConfirm(uint8_t* d); |
| |
| /// Normal destructor |
| virtual ~ZrtpPacketConfirm(); |
| |
| /// Check if SAS verify flag is set |
| const bool isSASFlag() { return confirmHeader->flags & 0x4; } |
| |
| /// Check if PBXEnrollment flag is set |
| const bool isPBXEnrollment() { return confirmHeader->flags & 0x8; } |
| |
| /// Get pointer to filler bytes (contains one bit of signature length) |
| const uint8_t* getFiller() { return confirmHeader->filler; } |
| |
| /// Get pointer to IV data, fixed byte array |
| const uint8_t* getIv() { return confirmHeader->iv; } |
| |
| /// Get pointer to MAC data, fixed byte array |
| const uint8_t* getHmac() { return confirmHeader->hmac; } |
| |
| /// Get Expiration time data |
| const uint32_t getExpTime() { return zrtpNtohl(confirmHeader->expTime); } |
| |
| /// Get pointer to initial hash chain (H0) data, fixed byte array |
| uint8_t* getHashH0() { return confirmHeader->hashH0; } |
| |
| /// Get pointer to signature data, variable length, refer to getSignatureLength() |
| const uint8_t* getSignatureData() { return ((uint8_t*)&confirmHeader->expTime) + 4; } |
| |
| /// get the signature length in words |
| int32_t getSignatureLength(); |
| |
| /// Check if packet length makes sense. Confirm packets are 19 words at minumum |
| bool isLengthOk() {return (getLength() >= 19); } |
| |
| bool isSignatureLengthOk(); |
| |
| /// set SAS verified flag |
| void setSASFlag() { confirmHeader->flags |= 0x4; } |
| |
| /// set setPBXEnrollment flag |
| void setPBXEnrollment() { confirmHeader->flags |= 0x8; } |
| |
| /// Set MAC data, fixed length byte array |
| void setHmac(uint8_t* text) { memcpy(confirmHeader->hmac, text, sizeof(confirmHeader->hmac)); } |
| |
| /// Set IV data, fixed length byte array |
| void setIv(uint8_t* text) { memcpy(confirmHeader->iv, text, sizeof(confirmHeader->iv)); } |
| |
| /// Set expiration time data |
| void setExpTime(uint32_t t) { confirmHeader->expTime = zrtpHtonl(t); } |
| |
| /// Set initial hash chain (H0) data, fixed length byte array |
| void setHashH0(uint8_t* t) { memcpy(confirmHeader->hashH0, t, sizeof(confirmHeader->hashH0)); } |
| |
| /// Set signature data, length of the signature data in bytes and must be a multiple of 4. |
| bool setSignatureData(uint8_t* data, int32_t length); |
| |
| /// Set signature length in words |
| bool 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 // ZRTPPACKETCONFIRM |
| |