The F Function

• (F0, F1) = F (R0, R1, r) // r is the round number

  • T0 = G(R0)
  • T1 = G(ROL(R1, 8))
  • F0 = (T0 + T1 + K2r+8) mod 232
  • F1 = (T0 + 2T1 + K2r+9) mod 232

• Pseudo-Hadamard Transformation (PHT)

  • a’ = a + b mod 232
  • b’ = a + 2b mod 232

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