Encryption with RC6-w/r/b

Input: Plaintext stored in four w-bit input registers A,B,C,D; Number r of rounds

w-bit round keys S[0,…,2r+3]

Output: Ciphertext stored in A,B,C,D

Procedure: B=B+S[0] D=D+S[1]

for i=1 to r do

{

t=(B ? (2B + 1 )) <<< lg w

u=(D ? (2D + 1)) <<< lg w

A=((A ? t) <<< u ) + S[2i]

C=((C ? u) <<< t) + S[2i+1]

(A,B,C,D)=(B,C,D,A)

}

A=A+S[2r+2] C=C+S[2r+3]

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