+#define R0(v, w, x, y, z, i) \
+ z += ((w & (x ^ y)) ^ y) + blk0(i) + 0x5A827999 + rol(v, 5); \
+ w = rol(w, 30);
+
+#define R1(v, w, x, y, z, i) \
+ z += ((w & (x ^ y)) ^ y) + blk(i) + 0x5A827999 + rol(v, 5); \
+ w = rol(w, 30);
+
+#define R2(v, w, x, y, z, i) \
+ z += (w ^ x ^ y) + blk(i) + 0x6ED9EBA1 + rol(v, 5); \
+ w = rol(w, 30);
+
+#define R3(v, w, x, y, z, i) \
+ z += (((w | x) & y) | (w & x)) + blk(i) + 0x8F1BBCDC + rol(v, 5); \
+ w = rol(w, 30);
+
+#define R4(v, w, x, y, z, i) \
+ z += (w ^ x ^ y) + blk(i) + 0xCA62C1D6 + rol(v, 5); \
+ w = rol(w, 30);
+
+/* Hash a single 512-bit block. This is the core of the algorithm. */