diff options
Diffstat (limited to 'CryptoPP/rc6.cpp')
-rw-r--r-- | CryptoPP/rc6.cpp | 96 |
1 files changed, 0 insertions, 96 deletions
diff --git a/CryptoPP/rc6.cpp b/CryptoPP/rc6.cpp deleted file mode 100644 index e58cb6ac9..000000000 --- a/CryptoPP/rc6.cpp +++ /dev/null @@ -1,96 +0,0 @@ -// rc6.cpp - written and placed in the public domain by Sean Woods -// based on Wei Dai's RC5 code. - -#include "pch.h" -#include "rc6.h" -#include "misc.h" - -NAMESPACE_BEGIN(CryptoPP) - -void RC6::Base::UncheckedSetKey(const byte *k, unsigned int keylen, const NameValuePairs ¶ms) -{ - AssertValidKeyLength(keylen); - - r = GetRoundsAndThrowIfInvalid(params, this); - sTable.New(2*(r+2)); - - static const RC6_WORD MAGIC_P = 0xb7e15163L; // magic constant P for wordsize - static const RC6_WORD MAGIC_Q = 0x9e3779b9L; // magic constant Q for wordsize - static const int U=sizeof(RC6_WORD); - - const unsigned int c = STDMAX((keylen+U-1)/U, 1U); // RC6 paper says c=1 if keylen==0 - SecBlock<RC6_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; - - RC6_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<RC6::RC6_WORD, LittleEndian> Block; - -void RC6::Enc::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const -{ - const RC6_WORD *sptr = sTable; - RC6_WORD a, b, c, d, t, u; - - Block::Get(inBlock)(a)(b)(c)(d); - b += sptr[0]; - d += sptr[1]; - sptr += 2; - - for(unsigned i=0; i<r; i++) - { - t = rotlFixed(b*(2*b+1), 5); - u = rotlFixed(d*(2*d+1), 5); - a = rotlMod(a^t,u) + sptr[0]; - c = rotlMod(c^u,t) + sptr[1]; - t = a; a = b; b = c; c = d; d = t; - sptr += 2; - } - - a += sptr[0]; - c += sptr[1]; - - Block::Put(xorBlock, outBlock)(a)(b)(c)(d); -} - -void RC6::Dec::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const -{ - const RC6_WORD *sptr = sTable.end(); - RC6_WORD a, b, c, d, t, u; - - Block::Get(inBlock)(a)(b)(c)(d); - - sptr -= 2; - c -= sptr[1]; - a -= sptr[0]; - - for (unsigned i=0; i < r; i++) - { - sptr -= 2; - t = a; a = d; d = c; c = b; b = t; - u = rotlFixed(d*(2*d+1), 5); - t = rotlFixed(b*(2*b+1), 5); - c = rotrMod(c-sptr[1], t) ^ u; - a = rotrMod(a-sptr[0], u) ^ t; - } - - sptr -= 2; - d -= sTable[1]; - b -= sTable[0]; - - Block::Put(xorBlock, outBlock)(a)(b)(c)(d); -} - -NAMESPACE_END |