1 files changed, 125 insertions, 0 deletions
diff --git a/botan/src/block/blowfish/blowfish.cpp b/botan/src/block/blowfish/blowfish.cpp
new file mode 100644
index 0000000..b0599d6
--- /dev/null
+++ b/botan/src/block/blowfish/blowfish.cpp
@@ -0,0 +1,125 @@
+/*
+* Blowfish
+* (C) 1999-2007 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#include <botan/blowfish.h>
+#include <botan/loadstor.h>
+
+namespace Botan {
+
+/*
+* Blowfish Encryption
+*/
+void Blowfish::enc(const byte in[], byte out[]) const
+   {
+   const u32bit* S1 = S + 0;
+   const u32bit* S2 = S + 256;
+   const u32bit* S3 = S + 512;
+   const u32bit* S4 = S + 768;
+
+   u32bit L = load_be<u32bit>(in, 0);
+   u32bit R = load_be<u32bit>(in, 1);
+
+   for(u32bit j = 0; j != 16; j += 2)
+      {
+      L ^= P[j];
+      R ^= ((S1[get_byte(0, L)]  + S2[get_byte(1, L)]) ^
+             S3[get_byte(2, L)]) + S4[get_byte(3, L)];
+
+      R ^= P[j+1];
+      L ^= ((S1[get_byte(0, R)]  + S2[get_byte(1, R)]) ^
+             S3[get_byte(2, R)]) + S4[get_byte(3, R)];
+      }
+
+   L ^= P[16]; R ^= P[17];
+
+   store_be(out, R, L);
+   }
+
+/*
+* Blowfish Decryption
+*/
+void Blowfish::dec(const byte in[], byte out[]) const
+   {
+   const u32bit* S1 = S + 0;
+   const u32bit* S2 = S + 256;
+   const u32bit* S3 = S + 512;
+   const u32bit* S4 = S + 768;
+
+   u32bit L = load_be<u32bit>(in, 0);
+   u32bit R = load_be<u32bit>(in, 1);
+
+   for(u32bit j = 17; j != 1; j -= 2)
+      {
+      L ^= P[j];
+      R ^= ((S1[get_byte(0, L)]  + S2[get_byte(1, L)]) ^
+             S3[get_byte(2, L)]) + S4[get_byte(3, L)];
+
+      R ^= P[j-1];
+      L ^= ((S1[get_byte(0, R)]  + S2[get_byte(1, R)]) ^
+             S3[get_byte(2, R)]) + S4[get_byte(3, R)];
+      }
+
+   L ^= P[1]; R ^= P[0];
+
+   store_be(out, R, L);
+   }
+
+/*
+* Blowfish Key Schedule
+*/
+void Blowfish::key_schedule(const byte key[], u32bit length)
+   {
+   clear();
+
+   for(u32bit j = 0, k = 0; j != 18; ++j, k += 4)
+      P[j] ^= make_u32bit(key[(k  ) % length], key[(k+1) % length],
+                          key[(k+2) % length], key[(k+3) % length]);
+
+   u32bit L = 0, R = 0;
+   generate_sbox(P,  18,  L, R);
+   generate_sbox(S, 1024, L, R);
+   }
+
+/*
+* Generate one of the Sboxes
+*/
+void Blowfish::generate_sbox(u32bit Box[], u32bit size,
+                             u32bit& L, u32bit& R) const
+   {
+   const u32bit* S1 = S + 0;
+   const u32bit* S2 = S + 256;
+   const u32bit* S3 = S + 512;
+   const u32bit* S4 = S + 768;
+
+   for(u32bit j = 0; j != size; j += 2)
+      {
+      for(u32bit k = 0; k != 16; k += 2)
+         {
+         L ^= P[k];
+         R ^= ((S1[get_byte(0, L)]  + S2[get_byte(1, L)]) ^
+                S3[get_byte(2, L)]) + S4[get_byte(3, L)];
+
+         R ^= P[k+1];
+         L ^= ((S1[get_byte(0, R)]  + S2[get_byte(1, R)]) ^
+                S3[get_byte(2, R)]) + S4[get_byte(3, R)];
+         }
+
+      u32bit T = R; R = L ^ P[16]; L = T ^ P[17];
+      Box[j] = L; Box[j+1] = R;
+      }
+   }
+
+/*
+* Clear memory of sensitive data
+*/
+void Blowfish::clear() throw()
+   {
+   P.copy(P_INIT, 18);
+   S.copy(S_INIT, 1024);
+   }
+
+}