diff options
Diffstat (limited to 'plugins/CryptoPP/crypto/gost.cpp')
| -rw-r--r-- | plugins/CryptoPP/crypto/gost.cpp | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/plugins/CryptoPP/crypto/gost.cpp b/plugins/CryptoPP/crypto/gost.cpp new file mode 100644 index 0000000000..4318b3df8f --- /dev/null +++ b/plugins/CryptoPP/crypto/gost.cpp @@ -0,0 +1,123 @@ +#include "pch.h"
+#include "gost.h"
+#include "misc.h"
+
+NAMESPACE_BEGIN(CryptoPP)
+
+// these are the S-boxes given in Applied Cryptography 2nd Ed., p. 333
+const byte GOST::Base::sBox[8][16]={
+ {4, 10, 9, 2, 13, 8, 0, 14, 6, 11, 1, 12, 7, 15, 5, 3},
+ {14, 11, 4, 12, 6, 13, 15, 10, 2, 3, 8, 1, 0, 7, 5, 9},
+ {5, 8, 1, 13, 10, 3, 4, 2, 14, 15, 12, 7, 6, 0, 9, 11},
+ {7, 13, 10, 1, 0, 8, 9, 15, 14, 4, 6, 12, 11, 2, 5, 3},
+ {6, 12, 7, 1, 5, 15, 13, 8, 4, 10, 9, 14, 0, 3, 11, 2},
+ {4, 11, 10, 0, 7, 2, 1, 13, 3, 6, 8, 5, 9, 12, 15, 14},
+ {13, 11, 4, 1, 3, 15, 5, 9, 0, 10, 14, 7, 6, 8, 2, 12},
+ {1, 15, 13, 0, 5, 7, 10, 4, 9, 2, 3, 14, 6, 11, 8, 12}};
+
+/* // these are the S-boxes given in the GOST source code listing in Applied
+ // Cryptography 2nd Ed., p. 644. they appear to be from the DES S-boxes
+ {13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7 },
+ { 4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1 },
+ {12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11 },
+ { 2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9 },
+ { 7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15 },
+ {10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8 },
+ {15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10 },
+ {14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7 }};
+*/
+
+bool GOST::Base::sTableCalculated = false;
+word32 GOST::Base::sTable[4][256];
+
+void GOST::Base::UncheckedSetKey(const byte *userKey, unsigned int length, const NameValuePairs &)
+{
+ AssertValidKeyLength(length);
+
+ PrecalculateSTable();
+
+ GetUserKey(LITTLE_ENDIAN_ORDER, key.begin(), 8, userKey, KEYLENGTH);
+}
+
+void GOST::Base::PrecalculateSTable()
+{
+ if (!sTableCalculated)
+ {
+ for (unsigned i = 0; i < 4; i++)
+ for (unsigned j = 0; j < 256; j++)
+ {
+ word32 temp = sBox[2*i][j%16] | (sBox[2*i+1][j/16] << 4);
+ sTable[i][j] = rotlMod(temp, 11+8*i);
+ }
+
+ sTableCalculated=true;
+ }
+}
+
+#define f(x) ( t=x, \
+ sTable[3][GETBYTE(t, 3)] ^ sTable[2][GETBYTE(t, 2)] \
+ ^ sTable[1][GETBYTE(t, 1)] ^ sTable[0][GETBYTE(t, 0)] )
+
+typedef BlockGetAndPut<word32, LittleEndian> Block;
+
+void GOST::Enc::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const
+{
+ word32 n1, n2, t;
+
+ Block::Get(inBlock)(n1)(n2);
+
+ for (unsigned int i=0; i<3; i++)
+ {
+ n2 ^= f(n1+key[0]);
+ n1 ^= f(n2+key[1]);
+ n2 ^= f(n1+key[2]);
+ n1 ^= f(n2+key[3]);
+ n2 ^= f(n1+key[4]);
+ n1 ^= f(n2+key[5]);
+ n2 ^= f(n1+key[6]);
+ n1 ^= f(n2+key[7]);
+ }
+
+ n2 ^= f(n1+key[7]);
+ n1 ^= f(n2+key[6]);
+ n2 ^= f(n1+key[5]);
+ n1 ^= f(n2+key[4]);
+ n2 ^= f(n1+key[3]);
+ n1 ^= f(n2+key[2]);
+ n2 ^= f(n1+key[1]);
+ n1 ^= f(n2+key[0]);
+
+ Block::Put(xorBlock, outBlock)(n2)(n1);
+}
+
+void GOST::Dec::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const
+{
+ word32 n1, n2, t;
+
+ Block::Get(inBlock)(n1)(n2);
+
+ n2 ^= f(n1+key[0]);
+ n1 ^= f(n2+key[1]);
+ n2 ^= f(n1+key[2]);
+ n1 ^= f(n2+key[3]);
+ n2 ^= f(n1+key[4]);
+ n1 ^= f(n2+key[5]);
+ n2 ^= f(n1+key[6]);
+ n1 ^= f(n2+key[7]);
+
+ for (unsigned int i=0; i<3; i++)
+ {
+ n2 ^= f(n1+key[7]);
+ n1 ^= f(n2+key[6]);
+ n2 ^= f(n1+key[5]);
+ n1 ^= f(n2+key[4]);
+ n2 ^= f(n1+key[3]);
+ n1 ^= f(n2+key[2]);
+ n2 ^= f(n1+key[1]);
+ n1 ^= f(n2+key[0]);
+ }
+
+ Block::Put(xorBlock, outBlock)(n2)(n1);
+}
+
+NAMESPACE_END
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