https://github.com/newam/p256-cm4

A rust re-implementation of Emill/P256-Cortex-M4
https://github.com/newam/p256-cm4

cryptography embedded p256 rust

Last synced: 5 days ago
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A rust re-implementation of Emill/P256-Cortex-M4

• Host: GitHub
• URL: https://github.com/newam/p256-cm4
• Owner: newAM
• License: mit
• Created: 2022-07-29T20:11:59.000Z (over 2 years ago)
• Default Branch: main
• Last Pushed: 2023-09-05T05:09:15.000Z (over 1 year ago)
• Last Synced: 2024-12-24T00:10:11.724Z (10 days ago)
• Topics: cryptography, embedded, p256, rust
• Language: Rust
• Homepage:
• Size: 28.3 KB
• Stars: 0
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • Changelog: CHANGELOG.md
  • License: LICENSE

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README

        
# P256-CM4

[![CI](https://github.com/newAM/p256-cm4/workflows/CI/badge.svg)](https://github.com/newAM/p256-cm4/actions)

[![crates.io](https://img.shields.io/crates/v/p256-cm4.svg)](https://crates.io/crates/p256-cm4)

[![docs](https://docs.rs/p256-cm4/badge.svg)](https://docs.rs/p256-cm4) 

A (mostly) rust re-implementation of [Emill/P256-Cortex-M4].

Rust 1.59.0 stabilized the [global_asm] macro which allows for this to be compiled without any additional tooling.  No `build.rs` script or external assembler required.

## Limitations

This is not yet complete, it lacks interoperability with other targets (via RustCrypto traits or compile-time switches).  See [ycrypto/p256-cortex-m4] for an interoperable solution.

This lacks the configurability of the original source because rust features are less powerful than C pre-processor macros.  Use [ycrypto/p256-cortex-m4-sys] if you require configurability.

## Comparisons

As measured on a STM32WLE5.

| Implementation | Signing Cycles (appx) | Verify Cycles (appx) | Flash Size (appx) |

|----------------|-----------------------|----------------------|-------------------|

| Hardware PKA   |             5,211,859 |           10,516,860 |           1,582 B |

| [RustCrypto]   |             7,856,436 |           14,303,277 |            49 kiB |

| `p256-cm4`     |               442,754 |            1,225,746 |            10 kiB |

## Maintainers Notes

### Testing

Install [probe-run].

Adjust `.cargo/config.toml`, `memory.x`, `testsuite/Cargo.toml`, and the clock setup for your target.

```bash

DEFMT_LOG=trace cargo test -p testsuite

```

### ASM Generation

Send the GCC ASM from [Emill/P256-Cortex-M4] through the pre-processor.

```bash

arm-none-eabi-gcc -O0 -ffunction-sections -fdata-sections -g -fno-omit-frame-pointer -mthumb -march=armv7e-m -Wall -Wextra -std=c11 -march=armv7e-m -c P256-Cortex-M4/p256-cortex-m4-asm-gcc.S -E > asm.s

```

[Emill/P256-Cortex-M4]: https://github.com/Emill/P256-Cortex-M4

[global_asm]: https://doc.rust-lang.org/core/arch/macro.global_asm.html

[ycrypto/p256-cortex-m4]: https://github.com/ycrypto/p256-cortex-m4

[ycrypto/p256-cortex-m4-sys]: https://github.com/ycrypto/p256-cortex-m4-sys

[RustCrypto]: https://github.com/RustCrypto/elliptic-curves

[probe-run]: https://github.com/knurling-rs/probe-run