Add Threefish-512

1 files changed, 160 insertions, 0 deletions

diff --git a/src/block/threefish/threefish.cpp b/src/block/threefish/threefish.cpp
new file mode 100644
index 000000000..5877235ab
--- /dev/null
+++ b/src/block/threefish/threefish.cpp
@@ -0,0 +1,160 @@
+/*
+* Threefish
+* (C) 2013 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#include <botan/threefish.h>
+#include <botan/rotate.h>
+#include <botan/loadstor.h>
+
+namespace Botan {
+
+secure_vector<byte> Threefish_512::start(const byte tweak[], size_t tweak_len)
+   {
+   if(!valid_nonce_length(tweak_len))
+      throw Invalid_IV_Length(name(), tweak_len);
+
+   m_T.resize(3);
+
+   m_T[0] = load_le<u64bit>(tweak, 0);
+   m_T[1] = load_le<u64bit>(tweak, 1);
+   m_T[2] = m_T[0] ^ m_T[1];
+
+   return secure_vector<byte>();
+   }
+
+void Threefish_512::update(secure_vector<byte>& blocks, size_t offset)
+   {
+   byte* buf = &blocks[offset];
+   size_t sz = blocks.size() - offset;
+
+   BOTAN_ASSERT(sz % update_granularity() == 0, "Block sized input");
+
+   BOTAN_ASSERT(m_T.size() == 3, "Tweak was set");
+
+   while(sz)
+      {
+#define THREEFISH_ROUND(I1,I2,I3,I4,I5,I6,I7,I8,ROT1,ROT2,ROT3,ROT4)   \
+      do {                                                             \
+         X##I1 += X##I2; X##I2 = rotate_left(X##I2, ROT1) ^ X##I1;     \
+         X##I3 += X##I4; X##I4 = rotate_left(X##I4, ROT2) ^ X##I3;     \
+         X##I5 += X##I6; X##I6 = rotate_left(X##I6, ROT3) ^ X##I5;     \
+         X##I7 += X##I8; X##I8 = rotate_left(X##I8, ROT4) ^ X##I7;     \
+      } while(0);
+
+#define THREEFISH_INJECT_KEY(r)                 \
+      do {                                      \
+         X0 += m_K[(r  ) % 9];                  \
+         X1 += m_K[(r+1) % 9];                  \
+         X2 += m_K[(r+2) % 9];                  \
+         X3 += m_K[(r+3) % 9];                  \
+         X4 += m_K[(r+4) % 9];                  \
+         X5 += m_K[(r+5) % 9] + m_T[(r  ) % 3]; \
+         X6 += m_K[(r+6) % 9] + m_T[(r+1) % 3]; \
+         X7 += m_K[(r+7) % 9] + (r);            \
+      } while(0);
+
+      u64bit X0 = load_le<u64bit>(buf, 0);
+      u64bit X1 = load_le<u64bit>(buf, 1);
+      u64bit X2 = load_le<u64bit>(buf, 2);
+      u64bit X3 = load_le<u64bit>(buf, 3);
+      u64bit X4 = load_le<u64bit>(buf, 4);
+      u64bit X5 = load_le<u64bit>(buf, 5);
+      u64bit X6 = load_le<u64bit>(buf, 6);
+      u64bit X7 = load_le<u64bit>(buf, 7);
+
+      THREEFISH_INJECT_KEY(0);
+
+#define THREEFISH_8_ROUNDS(R1,R2)                         \
+      do {                                                \
+         THREEFISH_ROUND(0,1,2,3,4,5,6,7, 46,36,19,37);   \
+         THREEFISH_ROUND(2,1,4,7,6,5,0,3, 33,27,14,42);   \
+         THREEFISH_ROUND(4,1,6,3,0,5,2,7, 17,49,36,39);   \
+         THREEFISH_ROUND(6,1,0,7,2,5,4,3, 44, 9,54,56);   \
+                                                          \
+         THREEFISH_INJECT_KEY(R1);                        \
+                                                          \
+         THREEFISH_ROUND(0,1,2,3,4,5,6,7, 39,30,34,24);   \
+         THREEFISH_ROUND(2,1,4,7,6,5,0,3, 13,50,10,17);   \
+         THREEFISH_ROUND(4,1,6,3,0,5,2,7, 25,29,39,43);   \
+         THREEFISH_ROUND(6,1,0,7,2,5,4,3,  8,35,56,22);   \
+                                                          \
+         THREEFISH_INJECT_KEY(R2);                        \
+      } while(0);
+
+      THREEFISH_8_ROUNDS(1,2);
+      THREEFISH_8_ROUNDS(3,4);
+      THREEFISH_8_ROUNDS(5,6);
+      THREEFISH_8_ROUNDS(7,8);
+      THREEFISH_8_ROUNDS(9,10);
+      THREEFISH_8_ROUNDS(11,12);
+      THREEFISH_8_ROUNDS(13,14);
+      THREEFISH_8_ROUNDS(15,16);
+      THREEFISH_8_ROUNDS(17,18);
+
+      store_le(buf, X0, X1, X2, X3, X4, X5, X6, X7);
+
+      buf += 64;
+      sz -= 64;
+      }
+   }
+
+Key_Length_Specification Threefish_512::key_spec() const
+   {
+   return Key_Length_Specification(64);
+   }
+
+void Threefish_512::key_schedule(const byte key[], size_t)
+   {
+   // todo: define key schedule for smaller keys
+   m_K.resize(9);
+
+   for(size_t i = 0; i != 8; ++i)
+      m_K[i] = load_le<u64bit>(key, i);
+
+   m_K[8] = m_K[0] ^ m_K[1] ^ m_K[2] ^ m_K[3] ^
+            m_K[4] ^ m_K[5] ^ m_K[6] ^ m_K[7] ^ 0x1BD11BDAA9FC1A22;
+   }
+
+void Threefish_512::finish(secure_vector<byte>& blocks, size_t offset)
+   {
+   update(blocks, offset);
+   m_T.clear();
+   }
+
+size_t Threefish_512::output_length(size_t input_length) const
+   {
+   if(input_length % update_granularity() == 0)
+      throw std::invalid_argument("Threefish - invalid input length " + std::to_string(input_length));
+
+   return input_length;
+   }
+
+size_t Threefish_512::update_granularity() const
+   {
+   return 64; // single block
+   }
+
+size_t Threefish_512::minimum_final_size() const
+   {
+   return 0;
+   }
+
+size_t Threefish_512::default_nonce_size() const
+   {
+   return 16;
+   }
+
+bool Threefish_512::valid_nonce_length(size_t nonce_len) const
+   {
+   return default_nonce_size() == nonce_len;
+   }
+
+void Threefish_512::clear()
+   {
+   zeroise(m_K);
+   }
+
+}