3 files changed, 225 insertions, 0 deletions
diff --git a/lib/block/rc2/info.txt b/lib/block/rc2/info.txt
new file mode 100644
index 000000000..fae09cf23
--- /dev/null
+++ b/lib/block/rc2/info.txt
@@ -0,0 +1 @@
+define RC2 20131128
diff --git a/lib/block/rc2/rc2.cpp b/lib/block/rc2/rc2.cpp
new file mode 100644
index 000000000..d7c76a7a6
--- /dev/null
+++ b/lib/block/rc2/rc2.cpp
@@ -0,0 +1,182 @@
+/*
+* RC2
+* (C) 1999-2007 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#include <botan/rc2.h>
+#include <botan/loadstor.h>
+#include <botan/rotate.h>
+
+namespace Botan {
+
+/*
+* RC2 Encryption
+*/
+void RC2::encrypt_n(const byte in[], byte out[], size_t blocks) const
+   {
+   for(size_t i = 0; i != blocks; ++i)
+      {
+      u16bit R0 = load_le<u16bit>(in, 0);
+      u16bit R1 = load_le<u16bit>(in, 1);
+      u16bit R2 = load_le<u16bit>(in, 2);
+      u16bit R3 = load_le<u16bit>(in, 3);
+
+      for(size_t j = 0; j != 16; ++j)
+         {
+         R0 += (R1 & ~R3) + (R2 & R3) + K[4*j];
+         R0 = rotate_left(R0, 1);
+
+         R1 += (R2 & ~R0) + (R3 & R0) + K[4*j + 1];
+         R1 = rotate_left(R1, 2);
+
+         R2 += (R3 & ~R1) + (R0 & R1) + K[4*j + 2];
+         R2 = rotate_left(R2, 3);
+
+         R3 += (R0 & ~R2) + (R1 & R2) + K[4*j + 3];
+         R3 = rotate_left(R3, 5);
+
+         if(j == 4 || j == 10)
+            {
+            R0 += K[R3 % 64];
+            R1 += K[R0 % 64];
+            R2 += K[R1 % 64];
+            R3 += K[R2 % 64];
+            }
+         }
+
+      store_le(out, R0, R1, R2, R3);
+
+      in += BLOCK_SIZE;
+      out += BLOCK_SIZE;
+      }
+   }
+
+/*
+* RC2 Decryption
+*/
+void RC2::decrypt_n(const byte in[], byte out[], size_t blocks) const
+   {
+   for(size_t i = 0; i != blocks; ++i)
+      {
+      u16bit R0 = load_le<u16bit>(in, 0);
+      u16bit R1 = load_le<u16bit>(in, 1);
+      u16bit R2 = load_le<u16bit>(in, 2);
+      u16bit R3 = load_le<u16bit>(in, 3);
+
+      for(size_t j = 0; j != 16; ++j)
+         {
+         R3 = rotate_right(R3, 5);
+         R3 -= (R0 & ~R2) + (R1 & R2) + K[63 - (4*j + 0)];
+
+         R2 = rotate_right(R2, 3);
+         R2 -= (R3 & ~R1) + (R0 & R1) + K[63 - (4*j + 1)];
+
+         R1 = rotate_right(R1, 2);
+         R1 -= (R2 & ~R0) + (R3 & R0) + K[63 - (4*j + 2)];
+
+         R0 = rotate_right(R0, 1);
+         R0 -= (R1 & ~R3) + (R2 & R3) + K[63 - (4*j + 3)];
+
+         if(j == 4 || j == 10)
+            {
+            R3 -= K[R2 % 64];
+            R2 -= K[R1 % 64];
+            R1 -= K[R0 % 64];
+            R0 -= K[R3 % 64];
+            }
+         }
+
+      store_le(out, R0, R1, R2, R3);
+
+      in += BLOCK_SIZE;
+      out += BLOCK_SIZE;
+      }
+   }
+
+/*
+* RC2 Key Schedule
+*/
+void RC2::key_schedule(const byte key[], size_t length)
+   {
+   static const byte TABLE[256] = {
+      0xD9, 0x78, 0xF9, 0xC4, 0x19, 0xDD, 0xB5, 0xED, 0x28, 0xE9, 0xFD, 0x79,
+      0x4A, 0xA0, 0xD8, 0x9D, 0xC6, 0x7E, 0x37, 0x83, 0x2B, 0x76, 0x53, 0x8E,
+      0x62, 0x4C, 0x64, 0x88, 0x44, 0x8B, 0xFB, 0xA2, 0x17, 0x9A, 0x59, 0xF5,
+      0x87, 0xB3, 0x4F, 0x13, 0x61, 0x45, 0x6D, 0x8D, 0x09, 0x81, 0x7D, 0x32,
+      0xBD, 0x8F, 0x40, 0xEB, 0x86, 0xB7, 0x7B, 0x0B, 0xF0, 0x95, 0x21, 0x22,
+      0x5C, 0x6B, 0x4E, 0x82, 0x54, 0xD6, 0x65, 0x93, 0xCE, 0x60, 0xB2, 0x1C,
+      0x73, 0x56, 0xC0, 0x14, 0xA7, 0x8C, 0xF1, 0xDC, 0x12, 0x75, 0xCA, 0x1F,
+      0x3B, 0xBE, 0xE4, 0xD1, 0x42, 0x3D, 0xD4, 0x30, 0xA3, 0x3C, 0xB6, 0x26,
+      0x6F, 0xBF, 0x0E, 0xDA, 0x46, 0x69, 0x07, 0x57, 0x27, 0xF2, 0x1D, 0x9B,
+      0xBC, 0x94, 0x43, 0x03, 0xF8, 0x11, 0xC7, 0xF6, 0x90, 0xEF, 0x3E, 0xE7,
+      0x06, 0xC3, 0xD5, 0x2F, 0xC8, 0x66, 0x1E, 0xD7, 0x08, 0xE8, 0xEA, 0xDE,
+      0x80, 0x52, 0xEE, 0xF7, 0x84, 0xAA, 0x72, 0xAC, 0x35, 0x4D, 0x6A, 0x2A,
+      0x96, 0x1A, 0xD2, 0x71, 0x5A, 0x15, 0x49, 0x74, 0x4B, 0x9F, 0xD0, 0x5E,
+      0x04, 0x18, 0xA4, 0xEC, 0xC2, 0xE0, 0x41, 0x6E, 0x0F, 0x51, 0xCB, 0xCC,
+      0x24, 0x91, 0xAF, 0x50, 0xA1, 0xF4, 0x70, 0x39, 0x99, 0x7C, 0x3A, 0x85,
+      0x23, 0xB8, 0xB4, 0x7A, 0xFC, 0x02, 0x36, 0x5B, 0x25, 0x55, 0x97, 0x31,
+      0x2D, 0x5D, 0xFA, 0x98, 0xE3, 0x8A, 0x92, 0xAE, 0x05, 0xDF, 0x29, 0x10,
+      0x67, 0x6C, 0xBA, 0xC9, 0xD3, 0x00, 0xE6, 0xCF, 0xE1, 0x9E, 0xA8, 0x2C,
+      0x63, 0x16, 0x01, 0x3F, 0x58, 0xE2, 0x89, 0xA9, 0x0D, 0x38, 0x34, 0x1B,
+      0xAB, 0x33, 0xFF, 0xB0, 0xBB, 0x48, 0x0C, 0x5F, 0xB9, 0xB1, 0xCD, 0x2E,
+      0xC5, 0xF3, 0xDB, 0x47, 0xE5, 0xA5, 0x9C, 0x77, 0x0A, 0xA6, 0x20, 0x68,
+      0xFE, 0x7F, 0xC1, 0xAD };
+
+   secure_vector<byte> L(128);
+   copy_mem(&L[0], key, length);
+
+   for(size_t i = length; i != 128; ++i)
+      L[i] = TABLE[(L[i-1] + L[i-length]) % 256];
+
+   L[128-length] = TABLE[L[128-length]];
+
+   for(s32bit i = 127-length; i >= 0; --i)
+      L[i] = TABLE[L[i+1] ^ L[i+length]];
+
+   K.resize(64);
+   load_le<u16bit>(&K[0], &L[0], 64);
+   }
+
+void RC2::clear()
+   {
+   zap(K);
+   }
+
+/*
+* Return the code of the effective key bits
+*/
+byte RC2::EKB_code(size_t ekb)
+   {
+   const byte EKB[256] = {
+      0xBD, 0x56, 0xEA, 0xF2, 0xA2, 0xF1, 0xAC, 0x2A, 0xB0, 0x93, 0xD1, 0x9C,
+      0x1B, 0x33, 0xFD, 0xD0, 0x30, 0x04, 0xB6, 0xDC, 0x7D, 0xDF, 0x32, 0x4B,
+      0xF7, 0xCB, 0x45, 0x9B, 0x31, 0xBB, 0x21, 0x5A, 0x41, 0x9F, 0xE1, 0xD9,
+      0x4A, 0x4D, 0x9E, 0xDA, 0xA0, 0x68, 0x2C, 0xC3, 0x27, 0x5F, 0x80, 0x36,
+      0x3E, 0xEE, 0xFB, 0x95, 0x1A, 0xFE, 0xCE, 0xA8, 0x34, 0xA9, 0x13, 0xF0,
+      0xA6, 0x3F, 0xD8, 0x0C, 0x78, 0x24, 0xAF, 0x23, 0x52, 0xC1, 0x67, 0x17,
+      0xF5, 0x66, 0x90, 0xE7, 0xE8, 0x07, 0xB8, 0x60, 0x48, 0xE6, 0x1E, 0x53,
+      0xF3, 0x92, 0xA4, 0x72, 0x8C, 0x08, 0x15, 0x6E, 0x86, 0x00, 0x84, 0xFA,
+      0xF4, 0x7F, 0x8A, 0x42, 0x19, 0xF6, 0xDB, 0xCD, 0x14, 0x8D, 0x50, 0x12,
+      0xBA, 0x3C, 0x06, 0x4E, 0xEC, 0xB3, 0x35, 0x11, 0xA1, 0x88, 0x8E, 0x2B,
+      0x94, 0x99, 0xB7, 0x71, 0x74, 0xD3, 0xE4, 0xBF, 0x3A, 0xDE, 0x96, 0x0E,
+      0xBC, 0x0A, 0xED, 0x77, 0xFC, 0x37, 0x6B, 0x03, 0x79, 0x89, 0x62, 0xC6,
+      0xD7, 0xC0, 0xD2, 0x7C, 0x6A, 0x8B, 0x22, 0xA3, 0x5B, 0x05, 0x5D, 0x02,
+      0x75, 0xD5, 0x61, 0xE3, 0x18, 0x8F, 0x55, 0x51, 0xAD, 0x1F, 0x0B, 0x5E,
+      0x85, 0xE5, 0xC2, 0x57, 0x63, 0xCA, 0x3D, 0x6C, 0xB4, 0xC5, 0xCC, 0x70,
+      0xB2, 0x91, 0x59, 0x0D, 0x47, 0x20, 0xC8, 0x4F, 0x58, 0xE0, 0x01, 0xE2,
+      0x16, 0x38, 0xC4, 0x6F, 0x3B, 0x0F, 0x65, 0x46, 0xBE, 0x7E, 0x2D, 0x7B,
+      0x82, 0xF9, 0x40, 0xB5, 0x1D, 0x73, 0xF8, 0xEB, 0x26, 0xC7, 0x87, 0x97,
+      0x25, 0x54, 0xB1, 0x28, 0xAA, 0x98, 0x9D, 0xA5, 0x64, 0x6D, 0x7A, 0xD4,
+      0x10, 0x81, 0x44, 0xEF, 0x49, 0xD6, 0xAE, 0x2E, 0xDD, 0x76, 0x5C, 0x2F,
+      0xA7, 0x1C, 0xC9, 0x09, 0x69, 0x9A, 0x83, 0xCF, 0x29, 0x39, 0xB9, 0xE9,
+      0x4C, 0xFF, 0x43, 0xAB };
+
+   if(ekb < 256)
+      return EKB[ekb];
+   else
+      throw Encoding_Error("RC2::EKB_code: EKB is too large");
+   }
+
+}
diff --git a/lib/block/rc2/rc2.h b/lib/block/rc2/rc2.h
new file mode 100644
index 000000000..ae41c9ce2
--- /dev/null
+++ b/lib/block/rc2/rc2.h
@@ -0,0 +1,42 @@
+/*
+* RC2
+* (C) 1999-2007 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#ifndef BOTAN_RC2_H__
+#define BOTAN_RC2_H__
+
+#include <botan/block_cipher.h>
+
+namespace Botan {
+
+/**
+* RC2
+*/
+class BOTAN_DLL RC2 : public Block_Cipher_Fixed_Params<8, 1, 32>
+   {
+   public:
+      void encrypt_n(const byte in[], byte out[], size_t blocks) const;
+      void decrypt_n(const byte in[], byte out[], size_t blocks) const;
+
+      /**
+      * Return the code of the effective key bits
+      * @param bits key length
+      * @return EKB code
+      */
+      static byte EKB_code(size_t bits);
+
+      void clear();
+      std::string name() const { return "RC2"; }
+      BlockCipher* clone() const { return new RC2; }
+   private:
+      void key_schedule(const byte[], size_t);
+
+      secure_vector<u16bit> K;
+   };
+
+}
+
+#endif