1 files changed, 72 insertions, 0 deletions
diff --git a/src/cipher/gost/gost.cpp b/src/cipher/gost/gost.cpp
new file mode 100644
index 000000000..dc2b397e7
--- /dev/null
+++ b/src/cipher/gost/gost.cpp
@@ -0,0 +1,72 @@
+/*************************************************
+* GOST Source File                               *
+* (C) 1999-2007 Jack Lloyd                       *
+*************************************************/
+
+#include <botan/gost.h>
+#include <botan/loadstor.h>
+
+namespace Botan {
+
+/*************************************************
+* GOST Encryption                                *
+*************************************************/
+void GOST::enc(const byte in[], byte out[]) const
+   {
+   u32bit N1 = load_le<u32bit>(in, 0), N2 = load_le<u32bit>(in, 1);
+
+   for(u32bit j = 0; j != 32; j += 2)
+      {
+      u32bit T0;
+
+      T0 = N1 + EK[j];
+      N2 ^= SBOX1[get_byte(0, T0)] | SBOX2[get_byte(1, T0)] |
+            SBOX3[get_byte(2, T0)] | SBOX4[get_byte(3, T0)];
+
+      T0 = N2 + EK[j+1];
+      N1 ^= SBOX1[get_byte(0, T0)] | SBOX2[get_byte(1, T0)] |
+            SBOX3[get_byte(2, T0)] | SBOX4[get_byte(3, T0)];
+      }
+
+   store_le(out, N2, N1);
+   }
+
+/*************************************************
+* GOST Decryption                                *
+*************************************************/
+void GOST::dec(const byte in[], byte out[]) const
+   {
+   u32bit N1 = load_le<u32bit>(in, 0), N2 = load_le<u32bit>(in, 1);
+
+   for(u32bit j = 0; j != 32; j += 2)
+      {
+      u32bit T0;
+
+      T0 = N1 + EK[31-j];
+      N2 ^= SBOX1[get_byte(0, T0)] | SBOX2[get_byte(1, T0)] |
+            SBOX3[get_byte(2, T0)] | SBOX4[get_byte(3, T0)];
+
+      T0 = N2 + EK[30-j];
+      N1 ^= SBOX1[get_byte(0, T0)] | SBOX2[get_byte(1, T0)] |
+            SBOX3[get_byte(2, T0)] | SBOX4[get_byte(3, T0)];
+      }
+
+   store_le(out, N2, N1);
+   }
+
+/*************************************************
+* GOST Key Schedule                              *
+*************************************************/
+void GOST::key(const byte key[], u32bit)
+   {
+   for(u32bit j = 0; j != 8; ++j)
+      {
+      u32bit K = load_le<u32bit>(key, j);
+      EK[j] = EK[j+8] = EK[j+16] = K;
+      }
+
+   for(u32bit j = 24; j != 32; ++j)
+      EK[j] = EK[7-(j-24)];
+   }
+
+}