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Diffstat (limited to '')
| -rw-r--r-- | CryptoPP/rc5.cpp | 79 |
1 files changed, 0 insertions, 79 deletions
diff --git a/CryptoPP/rc5.cpp b/CryptoPP/rc5.cpp deleted file mode 100644 index 2b730def7..000000000 --- a/CryptoPP/rc5.cpp +++ /dev/null @@ -1,79 +0,0 @@ -// rc5.cpp - written and placed in the public domain by Wei Dai - -#include "pch.h" -#include "rc5.h" -#include "misc.h" - -NAMESPACE_BEGIN(CryptoPP) - -void RC5::Base::UncheckedSetKey(const byte *k, unsigned int keylen, const NameValuePairs ¶ms) -{ - AssertValidKeyLength(keylen); - - r = GetRoundsAndThrowIfInvalid(params, this); - sTable.New(2*(r+1)); - - static const RC5_WORD MAGIC_P = 0xb7e15163L; // magic constant P for wordsize - static const RC5_WORD MAGIC_Q = 0x9e3779b9L; // magic constant Q for wordsize - static const int U=sizeof(RC5_WORD); - - const unsigned int c = STDMAX((keylen+U-1)/U, 1U); // RC6 paper says c=1 if keylen==0 - SecBlock<RC5_WORD> l(c); - - GetUserKey(LITTLE_ENDIAN_ORDER, l.begin(), c, k, keylen); - - sTable[0] = MAGIC_P; - for (unsigned j=1; j<sTable.size();j++) - sTable[j] = sTable[j-1] + MAGIC_Q; - - RC5_WORD a=0, b=0; - const unsigned n = 3*STDMAX((unsigned int)sTable.size(), c); - - for (unsigned h=0; h < n; h++) - { - a = sTable[h % sTable.size()] = rotlFixed((sTable[h % sTable.size()] + a + b), 3); - b = l[h % c] = rotlMod((l[h % c] + a + b), (a+b)); - } -} - -typedef BlockGetAndPut<RC5::RC5_WORD, LittleEndian> Block; - -void RC5::Enc::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const -{ - const RC5_WORD *sptr = sTable; - RC5_WORD a, b; - - Block::Get(inBlock)(a)(b); - a += sptr[0]; - b += sptr[1]; - sptr += 2; - - for(unsigned i=0; i<r; i++) - { - a = rotlMod(a^b,b) + sptr[2*i+0]; - b = rotlMod(a^b,a) + sptr[2*i+1]; - } - - Block::Put(xorBlock, outBlock)(a)(b); -} - -void RC5::Dec::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const -{ - const RC5_WORD *sptr = sTable.end(); - RC5_WORD a, b; - - Block::Get(inBlock)(a)(b); - - for (unsigned i=0; i<r; i++) - { - sptr-=2; - b = rotrMod(b-sptr[1], a) ^ a; - a = rotrMod(a-sptr[0], b) ^ b; - } - b -= sTable[1]; - a -= sTable[0]; - - Block::Put(xorBlock, outBlock)(a)(b); -} - -NAMESPACE_END |