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crypto/rsa: documents timing leaks in rsa package #67214

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EthanHeilman
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This PR documents the timing channel in RSA VerifyPKCS1v15 and VerifyPSS.
by not failing early if the RSA signature is larger,
i.e., if it overflows, the modulus N set by the public key.

Fixes #67043

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This PR (HEAD: a8487ce) has been imported to Gerrit for code review.

Please visit Gerrit at https://go-review.googlesource.com/c/go/+/583304.

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This PR (HEAD: 8afadc0) has been imported to Gerrit for code review.

Please visit Gerrit at https://go-review.googlesource.com/c/go/+/583304.

Important tips:

  • Don't comment on this PR. All discussion takes place in Gerrit.
  • You need a Gmail or other Google account to log in to Gerrit.
  • To change your code in response to feedback:
    • Push a new commit to the branch used by your GitHub PR.
    • A new "patch set" will then appear in Gerrit.
    • Respond to each comment by marking as Done in Gerrit if implemented as suggested. You can alternatively write a reply.
    • Critical: you must click the blue Reply button near the top to publish your Gerrit responses.
    • Multiple commits in the PR will be squashed by GerritBot.
  • The title and description of the GitHub PR are used to construct the final commit message.
    • Edit these as needed via the GitHub web interface (not via Gerrit or git).
    • You should word wrap the PR description at ~76 characters unless you need longer lines (e.g., for tables or URLs).
  • See the Sending a change via GitHub and Reviews sections of the Contribution Guide as well as the FAQ for details.

@gopherbot gopherbot closed this in 2d98f0e May 23, 2024
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crypto/rsa: timing channel in VerifyPKCS1v15 and VerifyPSS via Adaptive Public Key Queries
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