1 files changed, 127 insertions, 0 deletions
diff --git a/botan/src/block/seed/seed.cpp b/botan/src/block/seed/seed.cpp
new file mode 100644
index 0000000..b06a7cd
--- /dev/null
+++ b/botan/src/block/seed/seed.cpp
@@ -0,0 +1,127 @@
+/*
+* SEED
+* (C) 1999-2007 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#include <botan/seed.h>
+#include <botan/loadstor.h>
+
+namespace Botan {
+
+/*
+* SEED G Function
+*/
+u32bit SEED::G_FUNC::operator()(u32bit X) const
+   {
+   return (S0[get_byte(3, X)] ^ S1[get_byte(2, X)] ^
+           S2[get_byte(1, X)] ^ S3[get_byte(0, X)]);
+   }
+
+/*
+* SEED Encryption
+*/
+void SEED::enc(const byte in[], byte out[]) const
+   {
+   u32bit B0 = load_be<u32bit>(in, 0);
+   u32bit B1 = load_be<u32bit>(in, 1);
+   u32bit B2 = load_be<u32bit>(in, 2);
+   u32bit B3 = load_be<u32bit>(in, 3);
+
+   G_FUNC G;
+
+   for(u32bit j = 0; j != 16; j += 2)
+      {
+      u32bit T0, T1;
+
+      T0 = B2 ^ K[2*j];
+      T1 = G(B2 ^ B3 ^ K[2*j+1]);
+      T0 = G(T1 + T0);
+      T1 = G(T1 + T0);
+      B1 ^= T1;
+      B0 ^= T0 + T1;
+
+      T0 = B0 ^ K[2*j+2];
+      T1 = G(B0 ^ B1 ^ K[2*j+3]);
+      T0 = G(T1 + T0);
+      T1 = G(T1 + T0);
+      B3 ^= T1;
+      B2 ^= T0 + T1;
+      }
+
+   store_be(out, B2, B3, B0, B1);
+   }
+
+/*
+* SEED Decryption
+*/
+void SEED::dec(const byte in[], byte out[]) const
+   {
+   u32bit B0 = load_be<u32bit>(in, 0);
+   u32bit B1 = load_be<u32bit>(in, 1);
+   u32bit B2 = load_be<u32bit>(in, 2);
+   u32bit B3 = load_be<u32bit>(in, 3);
+
+   G_FUNC G;
+
+   for(u32bit j = 0; j != 16; j += 2)
+      {
+      u32bit T0, T1;
+
+      T0 = B2 ^ K[30-2*j];
+      T1 = G(B2 ^ B3 ^ K[31-2*j]);
+      T0 = G(T1 + T0);
+      T1 = G(T1 + T0);
+      B1 ^= T1;
+      B0 ^= T0 + T1;
+
+      T0 = B0 ^ K[28-2*j];
+      T1 = G(B0 ^ B1 ^ K[29-2*j]);
+      T0 = G(T1 + T0);
+      T1 = G(T1 + T0);
+      B3 ^= T1;
+      B2 ^= T0 + T1;
+      }
+
+   store_be(out, B2, B3, B0, B1);
+   }
+
+/*
+* SEED Key Schedule
+*/
+void SEED::key_schedule(const byte key[], u32bit)
+   {
+   const u32bit RC[16] = {
+      0x9E3779B9, 0x3C6EF373, 0x78DDE6E6, 0xF1BBCDCC,
+      0xE3779B99, 0xC6EF3733, 0x8DDE6E67, 0x1BBCDCCF,
+      0x3779B99E, 0x6EF3733C, 0xDDE6E678, 0xBBCDCCF1,
+      0x779B99E3, 0xEF3733C6, 0xDE6E678D, 0xBCDCCF1B
+   };
+
+   SecureBuffer<u32bit, 4> WK;
+
+   for(u32bit j = 0; j != 4; ++j)
+      WK[j] = load_be<u32bit>(key, j);
+
+   G_FUNC G;
+
+   for(u32bit j = 0; j != 16; j += 2)
+      {
+      K[2*j  ] = G(WK[0] + WK[2] - RC[j]);
+      K[2*j+1] = G(WK[1] - WK[3] + RC[j]) ^ K[2*j];
+
+      byte T = get_byte(3, WK[0]);
+      WK[0] = (WK[0] >> 8) | (get_byte(3, WK[1]) << 24);
+      WK[1] = (WK[1] >> 8) | (T << 24);
+
+      K[2*j+2] = G(WK[0] + WK[2] - RC[j+1]);
+      K[2*j+3] = G(WK[1] - WK[3] + RC[j+1]) ^ K[2*j+2];
+
+      T = get_byte(0, WK[3]);
+      WK[3] = (WK[3] << 8) | get_byte(0, WK[2]);
+      WK[2] = (WK[2] << 8) | T;
+      }
+   }
+
+}