SHA-2round, there is one round constant k[i] and one entry in the message schedule array w[i], 0 ≤ i ≤ 63 Note 3: The compression function uses 8 working variables
MD2Cryptography, 12(3), pp245–251, 1997. Frédéric Muller, The MD2 Hash Function is Not One-Way, ASIACRYPT 2004, pp214–229. Lars R. Knudsen and John Erik Mathiassen