Padding implementation is not constant-time
还没有人认领这个 Issue。
评估
- 难度
- 5/5
- 预计耗时
- 一周以上
- 新手友好度
- 35/100
- Issue 类型
- 缺陷
- 描述清晰度
- 需要澄清
- 活跃度
- 冷清
- 技术栈
- rust
- 领域
- cryptography, security
调研方向
Review this crate's RSA padding-mode implementation alongside the RSA guidance draft and the Marvin Toolkit analysis linked in the issue. Focus on PKCS#1 v1.5 depadding and error handling, then use static analysis and Marvin Toolkit results to verify that the implementation follows constant-time guidance and avoids the reported sidechannels.
由索引模型根据 Issue 内容生成。
描述
This is a followup to #19, which was originally about the modular exponentiation implementation not being constant-time, and also became our general tracking issue for the subsequent Marvin Attack.
We've gone to great lengths in crypto-bigint to produce the closest thing we can to a constant-time implementation of modular exponentiation, and while we still need to e.g. verify that's truly the case via static analysis tooling, based on the latest analysis from the Marvin Toolkit it seems like the remaining sidechannels in our implementation are probably no longer coming from crypto-bigint, but are instead in this crate's implementation of RSA padding modes.
PKCS#1 v1.5 in particular notably has a long history of sidechannels going back to Bleichenbacher's original 1998 attack, and attacks like Marvin can be seen as an evolution of that attack.
This I-D contains guidance for implementing RSA in constant-time, including things like handling depadding errors using strategies like implicit rejection:
https://datatracker.ietf.org/doc/draft-irtf-cfrg-rsa-guidance/
- 主要语言
- Rust
- 星标
- 673
- 派生
- 190
- PR 合并指标
- 30 天内没有已合并 PR
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