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0.3.0 (current) Rating: Positive Thoroughness: Medium Understanding: Medium

by ThomasdenH on 2021-12-23

This is a very small crate. The RNG doesn't make any security guarantees, which makes the risks associated with the crate low. The code seems to implement the algorithm from the paper straightforwardly, although it doesn't specify why the particular values for a, b, c were chosen. (They don't seem to appear in the paper)

0.3.0 (current) Rating: Positive Thoroughness: High Understanding: Medium

by Minoru on 2021-04-28

This implements a xorshift RNG with 128 bits of state.

The implementation uses no unsafe, and does not even require std. The code is straightforward, and matches the code from the paper that describes the RNG ("Xorshift RNGs" by George Marsaglia).

Seeding from an existing RNG can theoretically hang if the seeding RNG keeps returning zeroes. I filed https://github.com/rust-random/rngs/issues/24 about this and capped the rating at "positive".

The current version of rand_xorshift is 0.3.0.

0.1.1 (older version) Rating: Neutral Thoroughness: Medium Understanding: Medium

by git.sr.ht/~icefox on 2019-08-20

Uses a semi-unnecessary unsafe for speed, which I dislike, but is overall harmless.


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The current version of rand_xorshift is 0.3.0.

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safe-to-run

This crate can be compiled, run, and tested on a local workstation or in controlled automation without surprising consequences. More…

does-not-implement-crypto (implies crypto-safe)

Inspection reveals that the crate in question does not attempt to implement any cryptographic algorithms on its own.

Note that certification of this does not require an expert on all forms of cryptography: it's expected for crates we import to be "good enough" citizens, so they'll at least be forthcoming if they try to implement something cryptographic. When in doubt, please ask an expert.

crypto-safe
Implied by other criteria

All crypto algorithms in this crate have been reviewed by a relevant expert.

Note: If a crate does not implement crypto, use does-not-implement-crypto, which implies crypto-safe, but does not require expert review in order to audit for.

ub-risk-2 (implies ub-risk-3)

Negligible unsoundness or average soundness.

Full description of the audit criteria can be found at https://github.com/google/rust-crate-audits/blob/main/auditing_standards.md#ub-risk-2

ub-risk-3 (implies ub-risk-4)
Implied by other criteria

Mild unsoundness or suboptimal soundness.

Full description of the audit criteria can be found at https://github.com/google/rust-crate-audits/blob/main/auditing_standards.md#ub-risk-3

ub-risk-4
Implied by other criteria

Extreme unsoundness.

Full description of the audit criteria can be found at https://github.com/google/rust-crate-audits/blob/main/auditing_standards.md#ub-risk-4

safe-to-deploy (implies safe-to-run)

This crate will not introduce a serious security vulnerability to production software exposed to untrusted input. More…

unknown

May have been packaged automatically without a review


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To review the actual code of the crate, it's best to use cargo crev open rand_xorshift. Alternatively, you can download the tarball of rand_xorshift v0.3.0 or view the source online.