[circuits] swap_bytes_32 for reversing bytes in 32-bit words

[jimpo]

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[jimpo]

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• [circuits] Use swap_bytes for SHA-256 & SHA-512 digest BE to LE #902
• [circuits] swap_bytes_32 for reversing bytes in 32-bit words #901 👈 (View in Graphite)
• [circuits] swap_bytes circuit gadget builder #900
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Merge activity

• Sep 1, 8:47 PM UTC: jimpo added this pull request to the Graphite merge queue.
• Sep 1, 8:53 PM UTC: The Graphite merge queue couldn't merge this PR because it had merge conflicts.
• Sep 1, 9:10 PM UTC: jimpo added this pull request to the Graphite merge queue.
• Sep 1, 9:10 PM UTC: CI is running for this pull request on a draft pull request (#904) due to your merge queue CI optimization settings.
• Sep 1, 9:17 PM UTC: Merged by the Graphite merge queue via draft PR: #904.

[benediamond]

actually not clear to me what the point of extracting out swap_bytes_32 is. as far as i can see, no one calls that directly—it's only called by swap_bytes. is the point to use rotl, instead of bitshifting? but you could have done that without extracting the helper.

[jimpo]

It's for sha256::message_to_le_wires

[benediamond]

oh. my bad. missed that