Code review of the ethnum crate // Lib.rs

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1.5.0 (current) ub-risk-4

From google/supply-chain copy of google/rust-crate-audits. By Benjamin Saunders.

Reviewed in CL 624267108 Issues found:

error.rs: Unsoundly transmutes into std error types, making assumptions about stability and layout
fmt.rs: GenericRadix trait should be unsafe
fmt.rs: fmt_u256 has safety comments that are incorrect

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ub-risk-4

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

Lib.rs has been able to verify that all files in the crate's tarball are in the crate's repository with a git tag matching the version. Please note that this check is still in beta, and absence of this confirmation does not mean that the files don't match.

Crates in the crates.io registry are tarball snapshots uploaded by crates' publishers. The registry is not using crates' git repositories, so there is a possibility that published crates have a misleading repository URL, or contain different code from the code in the repository.

To review the actual code of the crate, it's best to use cargo crev open ethnum. Alternatively, you can download the tarball of ethnum v1.5.0 or view the source online.