C2PA cryptography implementation

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This crate contains some of the internal cryptography implementation that is shared between the c2pa crate and the CAWG identity SDK crate. It is not intended to be used directly in most cases.

Crate features

This crate has two features, neither of which are enabled by default:

• json_schema: Used by c2pa-rs documentation code to generate JSON schema for types defined in this crate.
• rust_native_crypto: Where available, prefer Rust-native cryptography libraries for raw signature and validation implementations. (Experimental)

Cryptographic library support

c2pa-crypto will use different cryptography libraries depending on which platform and feature flags are used:

Signing (synchronous or asynchronous)

(*) Applies to all supported platforms except WASM
❌ = not supported

Validation (synchronous)

(*) Applies to all supported platforms except WASM
❌ = not supported

Validation (asynchronous)

(*) Applies to all supported platforms except WASM

Contributions and feedback

We welcome contributions to this project. For information on contributing, providing feedback, and about ongoing work, see Contributing. For additional information on nightly builds and testing, see Contributing to the project.

License

The c2pa-crypto crate is distributed under the terms of both the MIT license and the Apache License (Version 2.0).

Some components and dependent crates are licensed under different terms; please check their licenses for details.