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716ef4b9c6
Better name when creating generic cypher pointers git-svn-id: svn://ultimatepp.org/upp/trunk@2760 f0d560ea-af0d-0410-9eb7-867de7ffcac7
75 lines
1.7 KiB
C++
75 lines
1.7 KiB
C++
#ifndef _Snow2_h_
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#define _Snow2_h_
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#include "CypherBase.h"
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NAMESPACE_UPP
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class Snow2 : public Cypher
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{
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private:
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// snow2 box and data
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dword s15,s14,s13,s12,s11,s10,s9,s8,s7,s6,s5,s4,s3,s2,s1,s0;
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dword outfrom_fsm,fsmtmp,r1,r2;
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// index of byte being encoded -- needed to sync with 16 x dword generated
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// keystream smaller chunks
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dword byteIndex;
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// keystream buffer
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dword keyStream[16];
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/*
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* Function: loadkey
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*
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* Synopsis:
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* Loads the key material and performs the initial mixing.
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*
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* Returns: void
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*
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* Assumptions:
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* keysize is either 128 or 256.
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* key is of proper length, for keysize=128, key is of lenght 16 bytes
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* and for keysize=256, key is of length 32 bytes.
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* key is given in big endian format,
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* thus key[0]->msb of s15
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* key[1]->second msb of s15
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* ...
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* key[3]-> lsb of s15
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* ...
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*/
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void loadkey(byte const *key, dword keysize, dword IV3, dword IV2, dword IV1, dword IV0);
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/*
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* Function: keystream
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*
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* Synopsis:
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* Clocks the cipher 16 times and returns 16 words of keystream symbols
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* in keystream_block.
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*
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* Returns: void
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*
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*/
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void keystream(dword *keystream_block);
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protected:
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// encode/decode buffer, dest on different buffer
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virtual void CypherCypher(byte const *sBuf, byte *dBuf, size_t bufLen);
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// key settings
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virtual bool CypherKey(byte const *keyBuf, size_t keyLen, byte const *nonce = NULL, size_t nonceLen = 0);
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public:
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// constructors
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Snow2();
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Snow2(const String &key, String const &nonce = Null);
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Snow2(byte const *keyBuf, size_t keyLen, byte const *nonce = NULL, size_t nonceLen = 0);
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}; // END Class Snow2Cypher
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END_UPP_NAMESPACE
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#endif
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