Initial checkin1.5.6

1 files changed, 118 insertions, 0 deletions

diff --git a/src/blowfish.cpp b/src/blowfish.cpp
new file mode 100644
index 000000000..9dabb4c38
--- /dev/null
+++ b/src/blowfish.cpp
@@ -0,0 +1,118 @@
+/*************************************************
+* Blowfish Source File                           *
+* (C) 1999-2006 The Botan Project                *
+*************************************************/
+
+#include <botan/blowfish.h>
+#include <botan/bit_ops.h>
+
+namespace Botan {
+
+/*************************************************
+* Blowfish Encryption                            *
+*************************************************/
+void Blowfish::enc(const byte in[], byte out[]) const
+   {
+   u32bit L = make_u32bit(in[0], in[1], in[2], in[3]),
+          R = make_u32bit(in[4], in[5], in[6], in[7]);
+
+   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];
+
+   out[0] = get_byte(0, R); out[1] = get_byte(1, R);
+   out[2] = get_byte(2, R); out[3] = get_byte(3, R);
+   out[4] = get_byte(0, L); out[5] = get_byte(1, L);
+   out[6] = get_byte(2, L); out[7] = get_byte(3, L);
+   }
+
+/*************************************************
+* Blowfish Decryption                            *
+*************************************************/
+void Blowfish::dec(const byte in[], byte out[]) const
+   {
+   u32bit L = make_u32bit(in[0], in[1], in[2], in[3]),
+          R = make_u32bit(in[4], in[5], in[6], in[7]);
+
+   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];
+
+   out[0] = get_byte(0, R); out[1] = get_byte(1, R);
+   out[2] = get_byte(2, R); out[3] = get_byte(3, R);
+   out[4] = get_byte(0, L); out[5] = get_byte(1, L);
+   out[6] = get_byte(2, L); out[7] = get_byte(3, L);
+   }
+
+/*************************************************
+* Blowfish Key Schedule                          *
+*************************************************/
+void Blowfish::key(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(S1, 256, L, R);
+   generate_sbox(S2, 256, L, R);
+   generate_sbox(S3, 256, L, R);
+   generate_sbox(S4, 256, L, R);
+   }
+
+/*************************************************
+* Generate one of the Sboxes                     *
+*************************************************/
+void Blowfish::generate_sbox(u32bit Box[], u32bit size,
+                             u32bit& L, u32bit& R) const
+   {
+   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(PBOX, 18);
+   S1.copy(SBOX1, 256);
+   S2.copy(SBOX2, 256);
+   S3.copy(SBOX3, 256);
+   S4.copy(SBOX4, 256);
+   }
+
+}