HPKE

This is originally a fork of hpke-rs and heavily modified.
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hpke-core: HPKE core functionality.

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hpke-crypto: cryptographic backend implementations for HPKE.

Currently supports the following:
backend-ring: uses ring as the cryptographic backend.
backend-aws-lc-rs: uses aws-lc-rs as the cryptographic backend.
backend-graviola: uses graviola as the cryptographic backend.
backend-rustcrypto: uses crates from RustCrypto as the cryptographic backend.
License
Licensed under MPL-2.0 license.