Created
November 28, 2016 16:25
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| def reverse17(val): | |
| return val ^ (val >> 17) ^ (val >> 34) ^ (val >> 51) | |
| def reverse23(val): | |
| return (val ^ (val << 23) ^ (val << 46)) & 0xFFFFFFFFFFFFFFF | |
| def xs128p_backward(state0, state1): | |
| prev_state1 = state0 | |
| prev_state0 = state1 ^ (state0 >> 26) | |
| prev_state0 = prev_state0 ^ state0 | |
| prev_state0 = reverse17(prev_state0) | |
| prev_state0 = reverse23(prev_state0) | |
| generated = (prev_state0 + prev_state1) & 0xFFFFFFFFFFFFFFFF | |
| return prev_state0, prev_state1, generated |
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