One stirring pass

• s0 ^= (KX[i] ^ KX[(i+83)&255]) + KX[s0&255] /* lossy, sometimes */

• s1 += s0

• s3 ^= s2

• s5 -= s4

• s7 ^= s6

• s3 += s0>ᡅ

• s4 ^= s1<᝻

• s5 ^= s3<<(s1&31)

• s6 += s2>ᡉ

• s7 |= s3+s4 /* lossy */

• s2 -= s5 /* cross-link */

• s0 -= s6^i

• s1 ^= s5 + PI19

• s2 += s7>>j

• s2 ^= s1

• s4 -= s3

• s6 ^= s5

• s0 += s7

• KX[i] = s2+s6

where I = 0 - 255, the KX table index.

J is the pass number

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