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Diffstat (limited to 'CryptoPP/twofish.cpp')
| -rw-r--r-- | CryptoPP/twofish.cpp | 168 |
1 files changed, 0 insertions, 168 deletions
diff --git a/CryptoPP/twofish.cpp b/CryptoPP/twofish.cpp deleted file mode 100644 index 064f16c44..000000000 --- a/CryptoPP/twofish.cpp +++ /dev/null @@ -1,168 +0,0 @@ -// twofish.cpp - modified by Wei Dai from Matthew Skala's twofish.c -// The original code and all modifications are in the public domain. - -#include "pch.h" -#include "twofish.h" -#include "misc.h" - -NAMESPACE_BEGIN(CryptoPP) - -// compute (c * x^4) mod (x^4 + (a + 1/a) * x^3 + a * x^2 + (a + 1/a) * x + 1) -// over GF(256) -static inline unsigned int Mod(unsigned int c) -{ - static const unsigned int modulus = 0x14d; - unsigned int c2 = (c<<1) ^ ((c & 0x80) ? modulus : 0); - unsigned int c1 = c2 ^ (c>>1) ^ ((c & 1) ? (modulus>>1) : 0); - return c | (c1 << 8) | (c2 << 16) | (c1 << 24); -} - -// compute RS(12,8) code with the above polynomial as generator -// this is equivalent to multiplying by the RS matrix -static word32 ReedSolomon(word32 high, word32 low) -{ - for (unsigned int i=0; i<8; i++) - { - high = Mod(high>>24) ^ (high<<8) ^ (low>>24); - low <<= 8; - } - return high; -} - -inline word32 Twofish::Base::h0(word32 x, const word32 *key, unsigned int kLen) -{ - x = x | (x<<8) | (x<<16) | (x<<24); - switch(kLen) - { -#define Q(a, b, c, d, t) q[a][GETBYTE(t,0)] ^ (q[b][GETBYTE(t,1)] << 8) ^ (q[c][GETBYTE(t,2)] << 16) ^ (q[d][GETBYTE(t,3)] << 24) - case 4: x = Q(1, 0, 0, 1, x) ^ key[6]; - case 3: x = Q(1, 1, 0, 0, x) ^ key[4]; - case 2: x = Q(0, 1, 0, 1, x) ^ key[2]; - x = Q(0, 0, 1, 1, x) ^ key[0]; - } - return x; -} - -inline word32 Twofish::Base::h(word32 x, const word32 *key, unsigned int kLen) -{ - x = h0(x, key, kLen); - return mds[0][GETBYTE(x,0)] ^ mds[1][GETBYTE(x,1)] ^ mds[2][GETBYTE(x,2)] ^ mds[3][GETBYTE(x,3)]; -} - -void Twofish::Base::UncheckedSetKey(const byte *userKey, unsigned int keylength, const NameValuePairs &) -{ - AssertValidKeyLength(keylength); - - unsigned int len = (keylength <= 16 ? 2 : (keylength <= 24 ? 3 : 4)); - SecBlock<word32> key(len*2); - GetUserKey(LITTLE_ENDIAN_ORDER, key.begin(), len*2, userKey, keylength); - - unsigned int i; - for (i=0; i<40; i+=2) - { - word32 a = h(i, key, len); - word32 b = rotlFixed(h(i+1, key+1, len), 8); - m_k[i] = a+b; - m_k[i+1] = rotlFixed(a+2*b, 9); - } - - SecBlock<word32> svec(2*len); - for (i=0; i<len; i++) - svec[2*(len-i-1)] = ReedSolomon(key[2*i+1], key[2*i]); - for (i=0; i<256; i++) - { - word32 t = h0(i, svec, len); - m_s[0*256+i] = mds[0][GETBYTE(t, 0)]; - m_s[1*256+i] = mds[1][GETBYTE(t, 1)]; - m_s[2*256+i] = mds[2][GETBYTE(t, 2)]; - m_s[3*256+i] = mds[3][GETBYTE(t, 3)]; - } -} - -#define G1(x) (m_s[0*256+GETBYTE(x,0)] ^ m_s[1*256+GETBYTE(x,1)] ^ m_s[2*256+GETBYTE(x,2)] ^ m_s[3*256+GETBYTE(x,3)]) -#define G2(x) (m_s[0*256+GETBYTE(x,3)] ^ m_s[1*256+GETBYTE(x,0)] ^ m_s[2*256+GETBYTE(x,1)] ^ m_s[3*256+GETBYTE(x,2)]) - -#define ENCROUND(n, a, b, c, d) \ - x = G1 (a); y = G2 (b); \ - x += y; y += x + k[2 * (n) + 1]; \ - (c) ^= x + k[2 * (n)]; \ - (c) = rotrFixed(c, 1); \ - (d) = rotlFixed(d, 1) ^ y - -#define ENCCYCLE(n) \ - ENCROUND (2 * (n), a, b, c, d); \ - ENCROUND (2 * (n) + 1, c, d, a, b) - -#define DECROUND(n, a, b, c, d) \ - x = G1 (a); y = G2 (b); \ - x += y; y += x; \ - (d) ^= y + k[2 * (n) + 1]; \ - (d) = rotrFixed(d, 1); \ - (c) = rotlFixed(c, 1); \ - (c) ^= (x + k[2 * (n)]) - -#define DECCYCLE(n) \ - DECROUND (2 * (n) + 1, c, d, a, b); \ - DECROUND (2 * (n), a, b, c, d) - -typedef BlockGetAndPut<word32, LittleEndian> Block; - -void Twofish::Enc::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const -{ - word32 x, y, a, b, c, d; - - Block::Get(inBlock)(a)(b)(c)(d); - - a ^= m_k[0]; - b ^= m_k[1]; - c ^= m_k[2]; - d ^= m_k[3]; - - const word32 *k = m_k+8; - ENCCYCLE (0); - ENCCYCLE (1); - ENCCYCLE (2); - ENCCYCLE (3); - ENCCYCLE (4); - ENCCYCLE (5); - ENCCYCLE (6); - ENCCYCLE (7); - - c ^= m_k[4]; - d ^= m_k[5]; - a ^= m_k[6]; - b ^= m_k[7]; - - Block::Put(xorBlock, outBlock)(c)(d)(a)(b); -} - -void Twofish::Dec::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const -{ - word32 x, y, a, b, c, d; - - Block::Get(inBlock)(c)(d)(a)(b); - - c ^= m_k[4]; - d ^= m_k[5]; - a ^= m_k[6]; - b ^= m_k[7]; - - const word32 *k = m_k+8; - DECCYCLE (7); - DECCYCLE (6); - DECCYCLE (5); - DECCYCLE (4); - DECCYCLE (3); - DECCYCLE (2); - DECCYCLE (1); - DECCYCLE (0); - - a ^= m_k[0]; - b ^= m_k[1]; - c ^= m_k[2]; - d ^= m_k[3]; - - Block::Put(xorBlock, outBlock)(a)(b)(c)(d); -} - -NAMESPACE_END |