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Maximum modulus size

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#350 2 条评论 0 个 reaction 已指派 0 人 在 GitHub 查看

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评估

难度
5/5
预计耗时
一周以上
新手友好度
25/100
Issue 类型
功能
描述清晰度
基本清楚
活跃度
停滞
技术栈
rust
领域
cryptography, security

调研方向

No file or test is named. Start by tracing the signature and RSA private-key parsing paths before conversion to BigUint, then review the existing PKCS#1v15 and PSS modulus checks. Done means agreeing on a maximum size, enforcing it before parsing, and adding coverage for oversized signatures and private keys.

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描述

In #349 I suggested adopting some sort of ceiling on the size of integers that are acceptable for signatures, i.e. a maximum modulus size. This would prevent parsing some large amount of data that doesn't make sense as a signature to an extremely large integer.

While we do have checks that the signature does not exceed the modulus for a given public key in PKCS#1v15 and PSS now (I believe?), these checks aren't applied until signature verification time, whereas I think this sort of sanity limit would be better applied before we ever parse to a BigUint.

It could also form an upper bound on what we consider acceptable as an RSA private key, where we currently have no limit.

Perhaps 16384-bits would be acceptable? /cc @dignifiedquire

主要语言
Rust
星标
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派生
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