Some CryptoProviders for jsonwebtoken.

Tests must be run with cargo-nextest, to ensure that the test processes remain separated. Running with cargo test will fail, this is expected. To run the tests, some data needs to be generated:

cd provider-tests
cargo run -- -k
cargo run -- -p aws-lc-rs
cargo run -- -p rust-crypto
cargo run -- -p openssl
cargo run -- -p botan

This generates JWTs signed with each provider, which are used to verify their signatures can be interpreted by every other provider. See the flake.nix for convenience wrappers.