Add SM3 hash function

3 files changed, 207 insertions, 0 deletions

diff --git a/src/lib/hash/sm3/info.txt b/src/lib/hash/sm3/info.txt
new file mode 100644
index 000000000..d0057456d
--- /dev/null
+++ b/src/lib/hash/sm3/info.txt
@@ -0,0 +1,5 @@
+define SM3 20131128
+
+<requires>
+mdx_hash
+</requires>
diff --git a/src/lib/hash/sm3/sm3.cpp b/src/lib/hash/sm3/sm3.cpp
new file mode 100644
index 000000000..cb4039789
--- /dev/null
+++ b/src/lib/hash/sm3/sm3.cpp
@@ -0,0 +1,150 @@
+/*
+* SM3
+* (C) 2017 Ribose Inc.
+*
+* Botan is released under the Simplified BSD License (see license.txt)
+*/
+
+#include <botan/sm3.h>
+
+namespace Botan {
+
+namespace {
+
+const uint32_t SM3_IV[] = {
+   0x7380166fUL, 0x4914b2b9UL, 0x172442d7UL, 0xda8a0600UL,
+   0xa96f30bcUL, 0x163138aaUL, 0xe38dee4dUL, 0xb0fb0e4eUL
+};
+
+const uint32_t SM3_TJ_0_15 = 0x79cc4519;
+const uint32_t SM3_TJ_16_63 = 0x7a879d8a;
+
+inline uint32_t P0(uint32_t X)
+   {
+   return X ^ rotate_left(X, 9) ^ rotate_left(X, 17);
+   }
+
+inline uint32_t P1(uint32_t X)
+   {
+   return X ^ rotate_left(X, 15) ^ rotate_left(X, 23);
+   }
+
+inline uint32_t FF0(uint32_t X, uint32_t Y, uint32_t Z)
+   {
+   return X ^ Y ^ Z;
+   }
+
+inline uint32_t FF1(uint32_t X, uint32_t Y, uint32_t Z)
+   {
+   return (X & Y) | (X & Z) | (Y & Z);
+   }
+
+inline uint32_t GG0(uint32_t X, uint32_t Y, uint32_t Z)
+   {
+   return X ^ Y ^ Z;
+   }
+
+inline uint32_t GG1(uint32_t X, uint32_t Y, uint32_t Z)
+   {
+   return (X & Y) | (~X & Z);
+   }
+
+}
+
+/*
+* SM3 Compression Function
+*/
+void SM3::compress_n(const uint8_t input[], size_t blocks)
+   {
+   uint32_t W[68], W1[64];
+   uint32_t SS1, SS2, TT1, TT2, T[64];
+
+   for(size_t i = 0; i != blocks; ++i)
+      {
+      uint32_t A = m_digest[0], B = m_digest[1], C = m_digest[2], D = m_digest[3],
+               E = m_digest[4], F = m_digest[5], G = m_digest[6], H = m_digest[7];
+
+      load_be(m_M.data(), input, m_M.size());
+
+      // Message Extension (a)
+      for (size_t j = 0; j < 16; j++)
+         {
+         W[j] = m_M[j];
+         }
+      // Message Extension (b)
+      for (size_t j = 16; j < 68; j++)
+         {
+         W[j] = P1(W[j-16] ^ W[j-9] ^ rotate_left(W[j-3], 15)) ^ rotate_left(W[j-13], 7) ^ W[j-6];
+         }
+      // Message Extension (c)
+      for (size_t j = 0; j < 64; j++)
+         {
+         W1[j] = W[j] ^ W[j+4];
+         }
+
+      for (size_t j = 0; j < 16; j++)
+         {
+         T[j] = SM3_TJ_0_15;
+         SS1 = rotate_left(rotate_left(A, 12) + E + rotate_left(T[j], j), 7);
+         SS2 = SS1 ^ rotate_left(A, 12);
+         TT1 = FF0(A, B, C) + D + SS2 + W1[j];
+         TT2 = GG0(E, F, G) + H + SS1 + W[j];
+         D = C;
+         C = rotate_left(B, 9);
+         B = A;
+         A = TT1;
+         H = G;
+         G = rotate_left(F, 19);
+         F = E;
+         E = P0(TT2);
+         }
+
+      for (size_t j = 16; j < 64; j++)
+         {
+         T[j] = SM3_TJ_16_63;
+         SS1 = rotate_left(rotate_left(A, 12) + E + rotate_left(T[j], j), 7);
+         SS2 = SS1 ^ rotate_left(A, 12);
+         TT1 = FF1(A, B, C) + D + SS2 + W1[j];
+         TT2 = GG1(E, F, G) + H + SS1 + W[j];
+         D = C;
+         C = rotate_left(B, 9);
+         B = A;
+         A = TT1;
+         H = G;
+         G = rotate_left(F, 19);
+         F = E;
+         E = P0(TT2);
+         }
+
+      m_digest[0] ^= A;
+      m_digest[1] ^= B;
+      m_digest[2] ^= C;
+      m_digest[3] ^= D;
+      m_digest[4] ^= E;
+      m_digest[5] ^= F;
+      m_digest[6] ^= G;
+      m_digest[7] ^= H;
+
+      input += hash_block_size();
+      }
+   }
+
+/*
+* Copy out the digest
+*/
+void SM3::copy_out(uint8_t output[])
+   {
+   copy_out_vec_be(output, output_length(), m_digest);
+   }
+
+/*
+* Clear memory of sensitive data
+*/
+void SM3::clear()
+   {
+   MDx_HashFunction::clear();
+   zeroise(m_M);
+   std::copy(std::begin(SM3_IV), std::end(SM3_IV), m_digest.begin());
+   }
+
+}
diff --git a/src/lib/hash/sm3/sm3.h b/src/lib/hash/sm3/sm3.h
new file mode 100644
index 000000000..896482332
--- /dev/null
+++ b/src/lib/hash/sm3/sm3.h
@@ -0,0 +1,52 @@
+/*
+* SM3
+* (C) 2017 Ribose Inc.
+*
+* Botan is released under the Simplified BSD License (see license.txt)
+*/
+
+#ifndef BOTAN_SM3_H__
+#define BOTAN_SM3_H__
+
+#include <botan/mdx_hash.h>
+
+namespace Botan {
+
+enum {
+  SM3_BLOCK_BYTES = 64,
+  SM3_DIGEST_BYTES = 32
+};
+
+/**
+* SM3
+*/
+class BOTAN_DLL SM3 final : public MDx_HashFunction
+   {
+   public:
+      std::string name() const override { return "SM3"; }
+      size_t output_length() const override { return SM3_DIGEST_BYTES; }
+      HashFunction* clone() const override { return new SM3; }
+
+      void clear() override;
+
+      SM3() : MDx_HashFunction(SM3_BLOCK_BYTES, true, true), m_M(16), m_digest(SM3_DIGEST_BYTES)
+         { clear(); }
+   protected:
+      void compress_n(const uint8_t[], size_t blocks) override;
+      void copy_out(uint8_t[]) override;
+
+   private:
+      /**
+      * The message buffer
+      */
+      secure_vector<uint32_t> m_M;
+
+      /**
+      * The digest value
+      */
+      secure_vector<uint32_t> m_digest;
+   };
+
+}
+
+#endif