sha/keccak1600.c: implement lane complementing transform

...as discussed in section 2.2 of "Keccak implementation overview". [skip ci] Reviewed-by: Rich Salz <[email protected]>
t-j-h · May 30, 2017 · 1f2aff2 · 1f2aff2
1 parent 0dd0be9
commit 1f2aff2
Showing 1 changed file with 58 additions and 0 deletions.
diff --git a/crypto/sha/keccak1600.c b/crypto/sha/keccak1600.c
@@ -355,70 +355,128 @@ static void Round(uint64_t R[5][5], uint64_t A[5][5], size_t i)
     C[3] = ROL64(A[3][3] ^ D[3], rhotates[3][3]);
     C[4] = ROL64(A[4][4] ^ D[4], rhotates[4][4]);
 
+#ifdef KECCAK_COMPLEMENTING_TRANSFORM
+    R[0][0] = C[0] ^ ( C[1] | C[2]) ^ iotas[i];
+    R[0][1] = C[1] ^ (~C[2] | C[3]);
+    R[0][2] = C[2] ^ ( C[3] & C[4]);
+    R[0][3] = C[3] ^ ( C[4] | C[0]);
+    R[0][4] = C[4] ^ ( C[0] & C[1]);
+#else
     R[0][0] = C[0] ^ (~C[1] & C[2]) ^ iotas[i];
     R[0][1] = C[1] ^ (~C[2] & C[3]);
     R[0][2] = C[2] ^ (~C[3] & C[4]);
     R[0][3] = C[3] ^ (~C[4] & C[0]);
     R[0][4] = C[4] ^ (~C[0] & C[1]);
+#endif
 
     C[0] = ROL64(A[0][3] ^ D[3], rhotates[0][3]);
     C[1] = ROL64(A[1][4] ^ D[4], rhotates[1][4]);
     C[2] = ROL64(A[2][0] ^ D[0], rhotates[2][0]);
     C[3] = ROL64(A[3][1] ^ D[1], rhotates[3][1]);
     C[4] = ROL64(A[4][2] ^ D[2], rhotates[4][2]);
 
+#ifdef KECCAK_COMPLEMENTING_TRANSFORM
+    R[1][0] = C[0] ^ (C[1] |  C[2]);
+    R[1][1] = C[1] ^ (C[2] &  C[3]);
+    R[1][2] = C[2] ^ (C[3] | ~C[4]);
+    R[1][3] = C[3] ^ (C[4] |  C[0]);
+    R[1][4] = C[4] ^ (C[0] &  C[1]);
+#else
     R[1][0] = C[0] ^ (~C[1] & C[2]);
     R[1][1] = C[1] ^ (~C[2] & C[3]);
     R[1][2] = C[2] ^ (~C[3] & C[4]);
     R[1][3] = C[3] ^ (~C[4] & C[0]);
     R[1][4] = C[4] ^ (~C[0] & C[1]);
+#endif
 
     C[0] = ROL64(A[0][1] ^ D[1], rhotates[0][1]);
     C[1] = ROL64(A[1][2] ^ D[2], rhotates[1][2]);
     C[2] = ROL64(A[2][3] ^ D[3], rhotates[2][3]);
     C[3] = ROL64(A[3][4] ^ D[4], rhotates[3][4]);
     C[4] = ROL64(A[4][0] ^ D[0], rhotates[4][0]);
 
+#ifdef KECCAK_COMPLEMENTING_TRANSFORM
+    R[2][0] =  C[0] ^ ( C[1] | C[2]);
+    R[2][1] =  C[1] ^ ( C[2] & C[3]);
+    R[2][2] =  C[2] ^ (~C[3] & C[4]);
+    R[2][3] = ~C[3] ^ ( C[4] | C[0]);
+    R[2][4] =  C[4] ^ ( C[0] & C[1]);
+#else
     R[2][0] = C[0] ^ (~C[1] & C[2]);
     R[2][1] = C[1] ^ (~C[2] & C[3]);
     R[2][2] = C[2] ^ (~C[3] & C[4]);
     R[2][3] = C[3] ^ (~C[4] & C[0]);
     R[2][4] = C[4] ^ (~C[0] & C[1]);
+#endif
 
     C[0] = ROL64(A[0][4] ^ D[4], rhotates[0][4]);
     C[1] = ROL64(A[1][0] ^ D[0], rhotates[1][0]);
     C[2] = ROL64(A[2][1] ^ D[1], rhotates[2][1]);
     C[3] = ROL64(A[3][2] ^ D[2], rhotates[3][2]);
     C[4] = ROL64(A[4][3] ^ D[3], rhotates[4][3]);
 
+#ifdef KECCAK_COMPLEMENTING_TRANSFORM
+    R[3][0] =  C[0] ^ ( C[1] & C[2]);
+    R[3][1] =  C[1] ^ ( C[2] | C[3]);
+    R[3][2] =  C[2] ^ (~C[3] | C[4]);
+    R[3][3] = ~C[3] ^ ( C[4] & C[0]);
+    R[3][4] =  C[4] ^ ( C[0] | C[1]);
+#else
     R[3][0] = C[0] ^ (~C[1] & C[2]);
     R[3][1] = C[1] ^ (~C[2] & C[3]);
     R[3][2] = C[2] ^ (~C[3] & C[4]);
     R[3][3] = C[3] ^ (~C[4] & C[0]);
     R[3][4] = C[4] ^ (~C[0] & C[1]);
+#endif
 
     C[0] = ROL64(A[0][2] ^ D[2], rhotates[0][2]);
     C[1] = ROL64(A[1][3] ^ D[3], rhotates[1][3]);
     C[2] = ROL64(A[2][4] ^ D[4], rhotates[2][4]);
     C[3] = ROL64(A[3][0] ^ D[0], rhotates[3][0]);
     C[4] = ROL64(A[4][1] ^ D[1], rhotates[4][1]);
 
+#ifdef KECCAK_COMPLEMENTING_TRANSFORM
+    R[4][0] =  C[0] ^ (~C[1] & C[2]);
+    R[4][1] = ~C[1] ^ ( C[2] | C[3]);
+    R[4][2] =  C[2] ^ ( C[3] & C[4]);
+    R[4][3] =  C[3] ^ ( C[4] | C[0]);
+    R[4][4] =  C[4] ^ ( C[0] & C[1]);
+#else
     R[4][0] = C[0] ^ (~C[1] & C[2]);
     R[4][1] = C[1] ^ (~C[2] & C[3]);
     R[4][2] = C[2] ^ (~C[3] & C[4]);
     R[4][3] = C[3] ^ (~C[4] & C[0]);
     R[4][4] = C[4] ^ (~C[0] & C[1]);
+#endif
 }
 
 void KeccakF1600(uint64_t A[5][5])
 {
     uint64_t T[5][5];
     size_t i;
 
+#ifdef KECCAK_COMPLEMENTING_TRANSFORM
+    A[0][1] = ~A[0][1];
+    A[0][2] = ~A[0][2];
+    A[1][3] = ~A[1][3];
+    A[2][2] = ~A[2][2];
+    A[3][2] = ~A[3][2];
+    A[4][0] = ~A[4][0];
+#endif
+
     for (i = 0; i < 24; i += 2) {
         Round(T, A, i);
         Round(A, T, i + 1);
     }
+
+#ifdef KECCAK_COMPLEMENTING_TRANSFORM
+    A[0][1] = ~A[0][1];
+    A[0][2] = ~A[0][2];
+    A[1][3] = ~A[1][3];
+    A[2][2] = ~A[2][2];
+    A[3][2] = ~A[3][2];
+    A[4][0] = ~A[4][0];
+#endif
 }
 
 #else