| /* |
| 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 _ZRTPPACKETHELLO_H_ |
| #define _ZRTPPACKETHELLO_H_ |
| |
| /** |
| * @file ZrtpPacketHello.h |
| * @brief The ZRTP Hello message |
| * |
| * @ingroup GNU_ZRTP |
| * @{ |
| */ |
| |
| #include <libzrtpcpp/ZrtpPacketBase.h> |
| |
| #define HELLO_FIXED_PART_LEN 22 |
| |
| /** |
| * Implement the Hello packet. |
| * |
| * The ZRTP Hello message. The implementation sends this |
| * to start the ZRTP negotiation sequence. The Hello message |
| * offers crypto methods and parameters to the other party. The |
| * other party selects methods and parameters it can support |
| * and uses the Commit message to commit these. |
| * |
| * @author Werner Dittmann <Werner.Dittmann@t-online.de> |
| */ |
| |
| class __EXPORT ZrtpPacketHello : public ZrtpPacketBase { |
| |
| protected: |
| Hello_t* helloHeader; ///< Point to the Hello message part |
| |
| int32_t nHash, ///< number of hash algorithms offered |
| nCipher, ///< number of cipher algorithms offered |
| nPubkey, ///< number of key agreement algorithms offered |
| nSas, ///< number of SAS algorithms offered |
| nAuth; ///< number of SRTP authentication algorithms offered |
| |
| int32_t oHash, ///< offsets in bytes to hash algorithm names |
| oCipher, ///< offsets in bytes to cipher algorithm names |
| oPubkey, ///< offsets in bytes to key agreement algorithm names |
| oSas, ///< offsets in bytes to SAS algorithm names |
| oAuth, ///< offsets in bytes to SRTP authentication algorithm names |
| oHmac; ///< offsets in bytes to MAC of Hello message |
| |
| public: |
| /// Creates a Hello packet with default data |
| ZrtpPacketHello(); |
| |
| /// Creates a Hello packet from received data |
| ZrtpPacketHello(uint8_t *data); |
| |
| virtual ~ZrtpPacketHello(); |
| |
| /** |
| * Set configure data and populate Hello message data. |
| * |
| * Fill in the offered Algorithm names and compute all offset to |
| * names and MAC. An application must call this method on Hello message |
| * objects created with the standard constructor (with default data) |
| * before the application can use most of the getter and setter methods. |
| * |
| * @param config |
| * Pointer to ZrtpConfigure data. |
| */ |
| void configureHello(ZrtpConfigure* config); |
| |
| /// Get version number from Hello message, fixed ASCII character array |
| uint8_t* getVersion() { return helloHeader->version; }; |
| |
| /// Get version number from Hello message as integer, only relvant digits converted |
| int32_t getVersionInt(); |
| |
| /// Get client id from Hello message, fixed ASCII character array |
| uint8_t* getClientId() { return helloHeader->clientId; }; |
| |
| /// Get H3 hash from Hello message, fixed byte array |
| uint8_t* getH3() { return helloHeader->hashH3; }; |
| |
| /// Get client ZID from Hello message, fixed bytes array |
| uint8_t* getZid() { return helloHeader->zid; }; |
| |
| /// Set version sting in Hello message, fixed ASCII character array |
| void setVersion(const uint8_t *text) { memcpy(helloHeader->version, text,ZRTP_WORD_SIZE ); } |
| |
| /// Set client id in Hello message, fixed ASCII character array |
| void setClientId(const uint8_t *t) { memcpy(helloHeader->clientId, t, sizeof(helloHeader->clientId)); } |
| |
| /// Set H3 hash in Hello message, fixed byte array |
| void setH3(uint8_t *hash) { memcpy(helloHeader->hashH3, hash, sizeof(helloHeader->hashH3)); } |
| |
| /// Set client ZID in Hello message, fixed bytes array |
| void setZid(uint8_t *text) { memcpy(helloHeader->zid, text, sizeof(helloHeader->zid)); } |
| |
| /// Check passive mode (mode not implemented) |
| bool isPassive() { return helloHeader->flags & 0x10; }; |
| |
| /// Check if MitM flag is set |
| bool isMitmMode() { return helloHeader->flags & 0x20; }; |
| |
| /// Check if SAS sign flag is set |
| bool isSasSign() { return helloHeader->flags & 0x40; }; |
| |
| /// Get hash algorithm name at position n, fixed ASCII character array |
| uint8_t* getHashType(int32_t n) { return ((uint8_t*)helloHeader)+oHash+(n*ZRTP_WORD_SIZE); } |
| |
| /// Get ciper algorithm name at position n, fixed ASCII character array |
| uint8_t* getCipherType(int32_t n) { return ((uint8_t*)helloHeader)+oCipher+(n*ZRTP_WORD_SIZE); } |
| |
| /// Get SRTP authentication algorithm name at position n, fixed ASCII character array |
| uint8_t* getAuthLen(int32_t n) { return ((uint8_t*)helloHeader)+oAuth+(n*ZRTP_WORD_SIZE); } |
| |
| /// Get key agreement algorithm name at position n, fixed ASCII character array |
| uint8_t* getPubKeyType(int32_t n) { return ((uint8_t*)helloHeader)+oPubkey+(n*ZRTP_WORD_SIZE); } |
| |
| /// Get SAS algorithm name at position n, fixed ASCII character array |
| uint8_t* getSasType(int32_t n) { return ((uint8_t*)helloHeader)+oSas+(n*ZRTP_WORD_SIZE); } |
| |
| /// Get Hello MAC, fixed byte array |
| uint8_t* getHMAC() { return ((uint8_t*)helloHeader)+oHmac; } |
| |
| /// Set hash algorithm name at position n, fixed ASCII character array |
| void setHashType(int32_t n, int8_t* t) |
| { memcpy(((uint8_t*)helloHeader)+oHash+(n*ZRTP_WORD_SIZE), t, ZRTP_WORD_SIZE); } |
| |
| /// Set ciper algorithm name at position n, fixed ASCII character array |
| void setCipherType(int32_t n, int8_t* t) |
| { memcpy(((uint8_t*)helloHeader)+oCipher+(n*ZRTP_WORD_SIZE), t, ZRTP_WORD_SIZE); } |
| |
| /// Set SRTP authentication algorithm name at position n, fixed ASCII character array |
| void setAuthLen(int32_t n, int8_t* t) |
| { memcpy(((uint8_t*)helloHeader)+oAuth+(n*ZRTP_WORD_SIZE), t, ZRTP_WORD_SIZE); } |
| |
| /// Set key agreement algorithm name at position n, fixed ASCII character array |
| void setPubKeyType(int32_t n, int8_t* t) |
| { memcpy(((uint8_t*)helloHeader)+oPubkey+(n*ZRTP_WORD_SIZE), t, ZRTP_WORD_SIZE); } |
| |
| /// Set SAS algorithm name at position n, fixed ASCII character array |
| void setSasType(int32_t n, int8_t* t) |
| { memcpy(((uint8_t*)helloHeader)+oSas+(n*ZRTP_WORD_SIZE), t, ZRTP_WORD_SIZE); } |
| |
| /// Set Hello MAC, fixed byte array |
| void setHMAC(uint8_t* t) |
| { memcpy(((uint8_t*)helloHeader)+oHmac, t, 2*ZRTP_WORD_SIZE); } |
| |
| /// Get number of offered hash algorithms |
| int32_t getNumHashes() {return nHash; } |
| |
| /// Get number of offered cipher algorithms |
| int32_t getNumCiphers() {return nCipher; } |
| |
| /// Get number of offered key agreement algorithms |
| int32_t getNumPubKeys() {return nPubkey; } |
| |
| /// Get number of offered SAS algorithms |
| int32_t getNumSas() {return nSas; } |
| |
| /// Get number of offered SRTP authentication algorithms |
| int32_t getNumAuth() {return nAuth; } |
| |
| /// set MitM flag |
| void setMitmMode() {helloHeader->flags |= 0x20; } |
| |
| /// set SAS sign flag |
| void setSasSign() {helloHeader->flags |= 0x40; } |
| |
| /// Check if packet length matches |
| bool isLengthOk() {return (computedLength == getLength());} |
| |
| private: |
| uint32_t computedLength; |
| // Hello packet is of variable length. It maximum size is 46 words: |
| // - 20 words fixed sizze |
| // - up to 35 words variable part, depending on number of algorithms |
| // leads to a maximum of 4*55=220 bytes. |
| uint8_t data[256]; // large enough to hold a full blown Hello packet |
| }; |
| |
| /** |
| * @} |
| */ |
| #endif // ZRTPPACKETHELLO |
| |