1 files changed, 79 insertions, 66 deletions
diff --git a/src/lib/hash/sha3/sha3.cpp b/src/lib/hash/sha3/sha3.cpp
index 837768f85..d01d33635 100644
--- a/src/lib/hash/sha3/sha3.cpp
+++ b/src/lib/hash/sha3/sha3.cpp
@@ -12,6 +12,80 @@
 
 namespace Botan {
 
+namespace {
+
+inline void SHA3_round(uint64_t T[25], const uint64_t A[25], uint64_t RC)
+   {
+   const uint64_t C0 = A[0] ^ A[5] ^ A[10] ^ A[15] ^ A[20];
+   const uint64_t C1 = A[1] ^ A[6] ^ A[11] ^ A[16] ^ A[21];
+   const uint64_t C2 = A[2] ^ A[7] ^ A[12] ^ A[17] ^ A[22];
+   const uint64_t C3 = A[3] ^ A[8] ^ A[13] ^ A[18] ^ A[23];
+   const uint64_t C4 = A[4] ^ A[9] ^ A[14] ^ A[19] ^ A[24];
+
+   const uint64_t D0 = rotl<1>(C0) ^ C3;
+   const uint64_t D1 = rotl<1>(C1) ^ C4;
+   const uint64_t D2 = rotl<1>(C2) ^ C0;
+   const uint64_t D3 = rotl<1>(C3) ^ C1;
+   const uint64_t D4 = rotl<1>(C4) ^ C2;
+
+   const uint64_t B00 =          A[ 0] ^ D1;
+   const uint64_t B01 = rotl<44>(A[ 6] ^ D2);
+   const uint64_t B02 = rotl<43>(A[12] ^ D3);
+   const uint64_t B03 = rotl<21>(A[18] ^ D4);
+   const uint64_t B04 = rotl<14>(A[24] ^ D0);
+   T[ 0] = B00 ^ (~B01 & B02) ^ RC;
+   T[ 1] = B01 ^ (~B02 & B03);
+   T[ 2] = B02 ^ (~B03 & B04);
+   T[ 3] = B03 ^ (~B04 & B00);
+   T[ 4] = B04 ^ (~B00 & B01);
+
+   const uint64_t B05 = rotl<28>(A[ 3] ^ D4);
+   const uint64_t B06 = rotl<20>(A[ 9] ^ D0);
+   const uint64_t B07 = rotl< 3>(A[10] ^ D1);
+   const uint64_t B08 = rotl<45>(A[16] ^ D2);
+   const uint64_t B09 = rotl<61>(A[22] ^ D3);
+   T[ 5] = B05 ^ (~B06 & B07);
+   T[ 6] = B06 ^ (~B07 & B08);
+   T[ 7] = B07 ^ (~B08 & B09);
+   T[ 8] = B08 ^ (~B09 & B05);
+   T[ 9] = B09 ^ (~B05 & B06);
+
+   const uint64_t B10 = rotl< 1>(A[ 1] ^ D2);
+   const uint64_t B11 = rotl< 6>(A[ 7] ^ D3);
+   const uint64_t B12 = rotl<25>(A[13] ^ D4);
+   const uint64_t B13 = rotl< 8>(A[19] ^ D0);
+   const uint64_t B14 = rotl<18>(A[20] ^ D1);
+   T[10] = B10 ^ (~B11 & B12);
+   T[11] = B11 ^ (~B12 & B13);
+   T[12] = B12 ^ (~B13 & B14);
+   T[13] = B13 ^ (~B14 & B10);
+   T[14] = B14 ^ (~B10 & B11);
+
+   const uint64_t B15 = rotl<27>(A[ 4] ^ D0);
+   const uint64_t B16 = rotl<36>(A[ 5] ^ D1);
+   const uint64_t B17 = rotl<10>(A[11] ^ D2);
+   const uint64_t B18 = rotl<15>(A[17] ^ D3);
+   const uint64_t B19 = rotl<56>(A[23] ^ D4);
+   T[15] = B15 ^ (~B16 & B17);
+   T[16] = B16 ^ (~B17 & B18);
+   T[17] = B17 ^ (~B18 & B19);
+   T[18] = B18 ^ (~B19 & B15);
+   T[19] = B19 ^ (~B15 & B16);
+
+   const uint64_t B20 = rotl<62>(A[ 2] ^ D3);
+   const uint64_t B21 = rotl<55>(A[ 8] ^ D4);
+   const uint64_t B22 = rotl<39>(A[14] ^ D0);
+   const uint64_t B23 = rotl<41>(A[15] ^ D1);
+   const uint64_t B24 = rotl< 2>(A[21] ^ D2);
+   T[20] = B20 ^ (~B21 & B22);
+   T[21] = B21 ^ (~B22 & B23);
+   T[22] = B22 ^ (~B23 & B24);
+   T[23] = B23 ^ (~B24 & B20);
+   T[24] = B24 ^ (~B20 & B21);
+   }
+
+}
+
 //static
 void SHA_3::permute(uint64_t A[25])
    {
@@ -33,73 +107,12 @@ void SHA_3::permute(uint64_t A[25])
       0x8000000000008080, 0x0000000080000001, 0x8000000080008008
    };
 
-   for(size_t i = 0; i != 24; ++i)
+   uint64_t T[25];
+
+   for(size_t i = 0; i != 24; i += 2)
       {
-      const uint64_t C0 = A[0] ^ A[5] ^ A[10] ^ A[15] ^ A[20];
-      const uint64_t C1 = A[1] ^ A[6] ^ A[11] ^ A[16] ^ A[21];
-      const uint64_t C2 = A[2] ^ A[7] ^ A[12] ^ A[17] ^ A[22];
-      const uint64_t C3 = A[3] ^ A[8] ^ A[13] ^ A[18] ^ A[23];
-      const uint64_t C4 = A[4] ^ A[9] ^ A[14] ^ A[19] ^ A[24];
-
-      const uint64_t D0 = rotl<1>(C0) ^ C3;
-      const uint64_t D1 = rotl<1>(C1) ^ C4;
-      const uint64_t D2 = rotl<1>(C2) ^ C0;
-      const uint64_t D3 = rotl<1>(C3) ^ C1;
-      const uint64_t D4 = rotl<1>(C4) ^ C2;
-
-      const uint64_t B00 = A[ 0] ^ D1;
-      const uint64_t B10 = rotl< 1>(A[ 1] ^ D2);
-      const uint64_t B20 = rotl<62>(A[ 2] ^ D3);
-      const uint64_t B05 = rotl<28>(A[ 3] ^ D4);
-      const uint64_t B15 = rotl<27>(A[ 4] ^ D0);
-      const uint64_t B16 = rotl<36>(A[ 5] ^ D1);
-      const uint64_t B01 = rotl<44>(A[ 6] ^ D2);
-      const uint64_t B11 = rotl< 6>(A[ 7] ^ D3);
-      const uint64_t B21 = rotl<55>(A[ 8] ^ D4);
-      const uint64_t B06 = rotl<20>(A[ 9] ^ D0);
-      const uint64_t B07 = rotl< 3>(A[10] ^ D1);
-      const uint64_t B17 = rotl<10>(A[11] ^ D2);
-      const uint64_t B02 = rotl<43>(A[12] ^ D3);
-      const uint64_t B12 = rotl<25>(A[13] ^ D4);
-      const uint64_t B22 = rotl<39>(A[14] ^ D0);
-      const uint64_t B23 = rotl<41>(A[15] ^ D1);
-      const uint64_t B08 = rotl<45>(A[16] ^ D2);
-      const uint64_t B18 = rotl<15>(A[17] ^ D3);
-      const uint64_t B03 = rotl<21>(A[18] ^ D4);
-      const uint64_t B13 = rotl< 8>(A[19] ^ D0);
-      const uint64_t B14 = rotl<18>(A[20] ^ D1);
-      const uint64_t B24 = rotl< 2>(A[21] ^ D2);
-      const uint64_t B09 = rotl<61>(A[22] ^ D3);
-      const uint64_t B19 = rotl<56>(A[23] ^ D4);
-      const uint64_t B04 = rotl<14>(A[24] ^ D0);
-
-      A[ 0] = B00 ^ (~B01 & B02);
-      A[ 1] = B01 ^ (~B02 & B03);
-      A[ 2] = B02 ^ (~B03 & B04);
-      A[ 3] = B03 ^ (~B04 & B00);
-      A[ 4] = B04 ^ (~B00 & B01);
-      A[ 5] = B05 ^ (~B06 & B07);
-      A[ 6] = B06 ^ (~B07 & B08);
-      A[ 7] = B07 ^ (~B08 & B09);
-      A[ 8] = B08 ^ (~B09 & B05);
-      A[ 9] = B09 ^ (~B05 & B06);
-      A[10] = B10 ^ (~B11 & B12);
-      A[11] = B11 ^ (~B12 & B13);
-      A[12] = B12 ^ (~B13 & B14);
-      A[13] = B13 ^ (~B14 & B10);
-      A[14] = B14 ^ (~B10 & B11);
-      A[15] = B15 ^ (~B16 & B17);
-      A[16] = B16 ^ (~B17 & B18);
-      A[17] = B17 ^ (~B18 & B19);
-      A[18] = B18 ^ (~B19 & B15);
-      A[19] = B19 ^ (~B15 & B16);
-      A[20] = B20 ^ (~B21 & B22);
-      A[21] = B21 ^ (~B22 & B23);
-      A[22] = B22 ^ (~B23 & B24);
-      A[23] = B23 ^ (~B24 & B20);
-      A[24] = B24 ^ (~B20 & B21);
-
-      A[0] ^= RC[i];
+      SHA3_round(T, A, RC[i+0]);
+      SHA3_round(A, T, RC[i+1]);
       }
    }