RC5_32_MASK
a &= RC5_32_MASK; \
b &= RC5_32_MASK;
b &= RC5_32_MASK; \
a &= RC5_32_MASK; \
S[i] = (S[i - 1] + RC5_32_Q) & RC5_32_MASK;
k = (S[ii] + A + B) & RC5_32_MASK;
k = (L[jj] + A + B) & RC5_32_MASK;