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Diffstat (limited to 'CryptoPP/seal.cpp')
| -rw-r--r-- | CryptoPP/seal.cpp | 213 |
1 files changed, 0 insertions, 213 deletions
diff --git a/CryptoPP/seal.cpp b/CryptoPP/seal.cpp deleted file mode 100644 index f49b52203..000000000 --- a/CryptoPP/seal.cpp +++ /dev/null @@ -1,213 +0,0 @@ -// seal.cpp - written and placed in the public domain by Wei Dai -// updated to SEAL 3.0 by Leonard Janke - -#include "pch.h" - -#include "seal.h" -#include "sha.h" -#include "misc.h" - -NAMESPACE_BEGIN(CryptoPP) - -void SEAL_TestInstantiations() -{ - SEAL<>::Encryption x; -} - -struct SEAL_Gamma -{ - SEAL_Gamma(const byte *key) - : H(5), Z(5), D(16), lastIndex(0xffffffff) - { - GetUserKey(BIG_ENDIAN_ORDER, H.begin(), 5, key, 20); - memset(D, 0, 64); - } - - word32 Apply(word32 i); - - SecBlock<word32> H, Z, D; - word32 lastIndex; -}; - -word32 SEAL_Gamma::Apply(word32 i) -{ - word32 shaIndex = i/5; - if (shaIndex != lastIndex) - { - memcpy(Z, H, 20); - D[0] = shaIndex; - SHA::Transform(Z, D); - lastIndex = shaIndex; - } - return Z[i%5]; -} - -template <class B> -void SEAL_Policy<B>::CipherSetKey(const NameValuePairs ¶ms, const byte *key, size_t length) -{ - m_insideCounter = m_outsideCounter = m_startCount = 0; - - unsigned int L = params.GetIntValueWithDefault("NumberOfOutputBitsPerPositionIndex", 32*1024); - m_iterationsPerCount = L / 8192; - - SEAL_Gamma gamma(key); - unsigned int i; - - for (i=0; i<512; i++) - m_T[i] = gamma.Apply(i); - - for (i=0; i<256; i++) - m_S[i] = gamma.Apply(0x1000+i); - - m_R.New(4*(L/8192)); - - for (i=0; i<m_R.size(); i++) - m_R[i] = gamma.Apply(0x2000+i); -} - -template <class B> -void SEAL_Policy<B>::CipherResynchronize(byte *keystreamBuffer, const byte *IV, size_t length) -{ - assert(length==4); - m_outsideCounter = IV ? GetWord<word32>(false, BIG_ENDIAN_ORDER, IV) : 0; - m_startCount = m_outsideCounter; - m_insideCounter = 0; -} - -template <class B> -void SEAL_Policy<B>::SeekToIteration(lword iterationCount) -{ - m_outsideCounter = m_startCount + (unsigned int)(iterationCount / m_iterationsPerCount); - m_insideCounter = (unsigned int)(iterationCount % m_iterationsPerCount); -} - -template <class B> -void SEAL_Policy<B>::OperateKeystream(KeystreamOperation operation, byte *output, const byte *input, size_t iterationCount) -{ - word32 a, b, c, d, n1, n2, n3, n4; - unsigned int p, q; - - for (size_t iteration = 0; iteration < iterationCount; ++iteration) - { -#define Ttab(x) *(word32 *)((byte *)m_T.begin()+x) - - a = m_outsideCounter ^ m_R[4*m_insideCounter]; - b = rotrFixed(m_outsideCounter, 8U) ^ m_R[4*m_insideCounter+1]; - c = rotrFixed(m_outsideCounter, 16U) ^ m_R[4*m_insideCounter+2]; - d = rotrFixed(m_outsideCounter, 24U) ^ m_R[4*m_insideCounter+3]; - - for (unsigned int j=0; j<2; j++) - { - p = a & 0x7fc; - b += Ttab(p); - a = rotrFixed(a, 9U); - - p = b & 0x7fc; - c += Ttab(p); - b = rotrFixed(b, 9U); - - p = c & 0x7fc; - d += Ttab(p); - c = rotrFixed(c, 9U); - - p = d & 0x7fc; - a += Ttab(p); - d = rotrFixed(d, 9U); - } - - n1 = d, n2 = b, n3 = a, n4 = c; - - p = a & 0x7fc; - b += Ttab(p); - a = rotrFixed(a, 9U); - - p = b & 0x7fc; - c += Ttab(p); - b = rotrFixed(b, 9U); - - p = c & 0x7fc; - d += Ttab(p); - c = rotrFixed(c, 9U); - - p = d & 0x7fc; - a += Ttab(p); - d = rotrFixed(d, 9U); - - // generate 8192 bits - for (unsigned int i=0; i<64; i++) - { - p = a & 0x7fc; - a = rotrFixed(a, 9U); - b += Ttab(p); - b ^= a; - - q = b & 0x7fc; - b = rotrFixed(b, 9U); - c ^= Ttab(q); - c += b; - - p = (p+c) & 0x7fc; - c = rotrFixed(c, 9U); - d += Ttab(p); - d ^= c; - - q = (q+d) & 0x7fc; - d = rotrFixed(d, 9U); - a ^= Ttab(q); - a += d; - - p = (p+a) & 0x7fc; - b ^= Ttab(p); - a = rotrFixed(a, 9U); - - q = (q+b) & 0x7fc; - c += Ttab(q); - b = rotrFixed(b, 9U); - - p = (p+c) & 0x7fc; - d ^= Ttab(p); - c = rotrFixed(c, 9U); - - q = (q+d) & 0x7fc; - d = rotrFixed(d, 9U); - a += Ttab(q); - -#define SEAL_OUTPUT(x) \ - CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, B::ToEnum(), 0, b + m_S[4*i+0]);\ - CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, B::ToEnum(), 1, c ^ m_S[4*i+1]);\ - CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, B::ToEnum(), 2, d + m_S[4*i+2]);\ - CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, B::ToEnum(), 3, a ^ m_S[4*i+3]); - - CRYPTOPP_KEYSTREAM_OUTPUT_SWITCH(SEAL_OUTPUT, 4*4); - - if (i & 1) - { - a += n3; - b += n4; - c ^= n3; - d ^= n4; - } - else - { - a += n1; - b += n2; - c ^= n1; - d ^= n2; - } - } - - if (++m_insideCounter == m_iterationsPerCount) - { - ++m_outsideCounter; - m_insideCounter = 0; - } - } - - a = b = c = d = n1 = n2 = n3 = n4 = 0; - p = q = 0; -} - -template class SEAL_Policy<BigEndian>; -template class SEAL_Policy<LittleEndian>; - -NAMESPACE_END |