1 unstable release
0.1.0 | Oct 6, 2024 |
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#653 in Cryptography
125KB
3K
SLoC
RustCrypto: RSA (No-Heap Fork)
This repo is a fork of the RustCrypto RSA crate
What's Different?
This fork is a proof of concept focused on removing heap usage and allocations. It's written for environments where memory constraints are tight, such as embedded systems or no_std contexts.
Key Features
- No heap allocations: All operations run entirely on the stack.
- Public Key Functions: Only public key operations like signature verification and encryption are implemented so far.
- Pluggable BigInt: The
BigInt
implementation is swappable. It’s a type parameter in theRsaPublicKey<T>
, whereT
must implementnum_traits::PrimInt
and some additional traits.
What's Missing?
- Private Key Operations: Private key functions (like signing and decryption) are stubbed out.
- A lot of tests: Most of the tests from original are stubbed out, as they rely on PEM key decoding functions that need heap.
- No expectation of security: Only signature verification is probably okay to use.
Why This Fork?
It's a proof of concept to try how compact a RSA implementation can become. Currently tested on Cortex-M0, fitting into about 8Kb code space and requiring about 3kB stack at the minimum.
Dependencies
~2MB
~43K SLoC