1 files changed, 147 insertions, 0 deletions
diff --git a/botan/src/stream/wid_wake/wid_wake.cpp b/botan/src/stream/wid_wake/wid_wake.cpp
new file mode 100644
index 0000000..1dc0fd7
--- /dev/null
+++ b/botan/src/stream/wid_wake/wid_wake.cpp
@@ -0,0 +1,147 @@
+/*
+* WiderWake
+* (C) 1999-2007 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#include <botan/wid_wake.h>
+#include <botan/loadstor.h>
+#include <botan/xor_buf.h>
+
+namespace Botan {
+
+/*
+* Combine cipher stream with message
+*/
+void WiderWake_41_BE::cipher(const byte in[], byte out[], u32bit length)
+   {
+   while(length >= buffer.size() - position)
+      {
+      xor_buf(out, in, buffer + position, buffer.size() - position);
+      length -= (buffer.size() - position);
+      in += (buffer.size() - position);
+      out += (buffer.size() - position);
+      generate(buffer.size());
+      }
+   xor_buf(out, in, buffer + position, length);
+   position += length;
+   }
+
+/*
+* Generate cipher stream
+*/
+void WiderWake_41_BE::generate(u32bit length)
+   {
+   u32bit R0 = state[0], R1 = state[1],
+          R2 = state[2], R3 = state[3],
+          R4 = state[4];
+
+   for(u32bit j = 0; j != length; j += 8)
+      {
+      u32bit R0a;
+
+      store_be(R3, buffer + j);
+
+      R0a = R4 + R3; R3 += R2; R2 += R1; R1 += R0;
+      R0a = (R0a >> 8) ^ T[(R0a & 0xFF)];
+      R1  = (R1  >> 8) ^ T[(R1  & 0xFF)];
+      R2  = (R2  >> 8) ^ T[(R2  & 0xFF)];
+      R3  = (R3  >> 8) ^ T[(R3  & 0xFF)];
+      R4 = R0; R0 = R0a;
+
+      store_be(R3, buffer + j + 4);
+
+      R0a = R4 + R3; R3 += R2; R2 += R1; R1 += R0;
+      R0a = (R0a >> 8) ^ T[(R0a & 0xFF)];
+      R1  = (R1  >> 8) ^ T[(R1  & 0xFF)];
+      R2  = (R2  >> 8) ^ T[(R2  & 0xFF)];
+      R3  = (R3  >> 8) ^ T[(R3  & 0xFF)];
+      R4 = R0; R0 = R0a;
+      }
+
+   state[0] = R0;
+   state[1] = R1;
+   state[2] = R2;
+   state[3] = R3;
+   state[4] = R4;
+
+   position = 0;
+   }
+
+/*
+* WiderWake Key Schedule
+*/
+void WiderWake_41_BE::key_schedule(const byte key[], u32bit)
+   {
+   for(u32bit j = 0; j != 4; ++j)
+      t_key[j] = load_be<u32bit>(key, j);
+
+   static const u32bit MAGIC[8] = {
+      0x726A8F3B, 0xE69A3B5C, 0xD3C71FE5, 0xAB3C73D2,
+      0x4D3A8EB3, 0x0396D6E8, 0x3D4C2F7A, 0x9EE27CF3 };
+
+   for(u32bit j = 0; j != 4; ++j)
+      T[j] = t_key[j];
+   for(u32bit j = 4; j != 256; ++j)
+      {
+      u32bit X = T[j-1] + T[j-4];
+      T[j] = (X >> 3) ^ MAGIC[X % 8];
+      }
+   for(u32bit j = 0; j != 23; ++j)
+      T[j] += T[j+89];
+
+   u32bit X = T[33];
+   u32bit Z = (T[59] | 0x01000001) & 0xFF7FFFFF;
+   for(u32bit j = 0; j != 256; ++j)
+      {
+      X = (X & 0xFF7FFFFF) + Z;
+      T[j] = (T[j] & 0x00FFFFFF) ^ X;
+      }
+   X = (T[X & 0xFF] ^ X) & 0xFF;
+   Z = T[0];
+   T[0] = T[X];
+   for(u32bit j = 1; j != 256; ++j)
+      {
+      T[X] = T[j];
+      X = (T[j ^ X] ^ X) & 0xFF;
+      T[j] = T[X];
+      }
+   T[X] = Z;
+
+   position = 0;
+   const byte iv[8] = { 0 };
+   resync(iv, 8);
+   }
+
+/*
+* Resynchronization
+*/
+void WiderWake_41_BE::resync(const byte iv[], u32bit length)
+   {
+   if(length != 8)
+      throw Invalid_IV_Length(name(), length);
+
+   for(u32bit j = 0; j != 4; ++j)
+      state[j] = t_key[j];
+   state[4] = load_be<u32bit>(iv, 0);
+   state[0] ^= state[4];
+   state[2] ^= load_be<u32bit>(iv, 1);
+
+   generate(8*4);
+   generate(buffer.size());
+   }
+
+/*
+* Clear memory of sensitive data
+*/
+void WiderWake_41_BE::clear() throw()
+   {
+   position = 0;
+   t_key.clear();
+   state.clear();
+   T.clear();
+   buffer.clear();
+   }
+
+}