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Re: [quicwg/base-drafts] ChaCha20 header protection sample (#3199)

Kazuho Oku <notifications@github.com> Thu, 07 November 2019 00:45 UTC

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From: Kazuho Oku <notifications@github.com>
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Subject: Re: [quicwg/base-drafts] ChaCha20 header protection sample (#3199)
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I do not have a strong opinion here, though I might point out that [RFC 7539 section 2.3](https://tools.ietf.org/html/rfc7539#section-2.3) states:
```
   o  Word 12 is a block counter.  Since each block is 64-byte, a 32-bit
      word is enough for 256 gigabytes of data.

   o  Words 13-15 are a nonce, which should not be repeated for the same
      key.  The 13th word is the first 32 bits of the input nonce taken
      as a little-endian integer, while the 15th word is the last 32
      bits.
```

Retaining this order (i.e. `counter||nonce`) might be helpful to certain implementations.

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