Plan 9 from Bell Labs’s /usr/web/sources/patch/aes-ctr/readme

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Distributed under the MIT License.
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The implementation of AES CTR mode had a flaw resulting in a
divide by zero when incrementing the counter, if its size
was 32 bits or larger.  While fixing this, the temptation
was irresistible to insert a fast path (avoiding mp arithmetic)
for the special case of a 32-bit counter (which is the size
mandated by RFC 3686 and used in ssh2).

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