diff options
| author | Vadim Dashevskiy <watcherhd@gmail.com> | 2012-05-15 10:38:20 +0000 |
|---|---|---|
| committer | Vadim Dashevskiy <watcherhd@gmail.com> | 2012-05-15 10:38:20 +0000 |
| commit | 48540940b6c28bb4378abfeb500ec45a625b37b6 (patch) | |
| tree | 2ef294c0763e802f91d868bdef4229b6868527de /plugins/CryptoPP/crypto/seal.cpp | |
| parent | 5c350913f011e119127baeb32a6aedeb4f0d33bc (diff) | |
initial commit
git-svn-id: http://svn.miranda-ng.org/main/trunk@2 1316c22d-e87f-b044-9b9b-93d7a3e3ba9c
Diffstat (limited to 'plugins/CryptoPP/crypto/seal.cpp')
| -rw-r--r-- | plugins/CryptoPP/crypto/seal.cpp | 217 |
1 files changed, 217 insertions, 0 deletions
diff --git a/plugins/CryptoPP/crypto/seal.cpp b/plugins/CryptoPP/crypto/seal.cpp new file mode 100644 index 0000000000..0af337544d --- /dev/null +++ b/plugins/CryptoPP/crypto/seal.cpp @@ -0,0 +1,217 @@ +// seal.cpp - written and placed in the public domain by Wei Dai
+// updated to SEAL 3.0 by Leonard Janke
+
+#include "pch.h"
+
+// prevent Sun's CC compiler from including this file automatically
+#if !(defined(__SUNPRO_CC) && defined(CRYPTOPP_ITERHASH_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)
+{
+ 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
+
+#endif
|