Compact Implementations of HIGHT Block Cipher on IoT Platforms

Table 8

Optimized key scheduling.

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Input: four 7-bit delta (A), four 8-bit operand (B)

Output: four 8-bit result (A)

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1: AND TEMP, B, 0 × 7F7F7F7F

2: ADD TEMP, A, TEMP

3: AND A, B, 0 × 80808080

4: EOR A, A, TEMP

5: Return A

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