reallyme-codec 0.2.1

ReallyMe codec utilities for PEM, lowercase hex, multibase, multicodec, multikey, CBOR, JCS, and base encodings.
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<!--
SPDX-FileCopyrightText: Copyright © 2026 ReallyMe LLC. All rights reserved

SPDX-License-Identifier: Apache-2.0
-->

# reallyme-codec

`reallyme-codec` is the recommended Rust entry point for the ReallyMe Codec
workspace. It provides identity encoding utilities without pulling in
signature, AEAD, KEM, or password-hashing implementations.

Use this crate when a resolver, service, or tool needs key and content
encodings but does not need cryptographic operations. The supported surface is
algorithm-agnostic: PEM armor, base64/base64url, lowercase hex, multibase,
multicodec, multikey, canonical CBOR/DAG-CBOR helpers, and JSON
Canonicalization Scheme helpers.

## Install

```toml
[dependencies]
reallyme-codec = "0.2.1"
```

The default feature set enables every codec family. Consumers that need a
smaller dependency surface can select only the families they use:

```toml
[dependencies]
reallyme-codec = { version = "0.2.1", default-features = false, features = ["base64url", "multikey"] }
```

## Quick Start

```rust
use reallyme_codec::base64url::{base64url_to_bytes, bytes_to_base64url};

fn round_trip() -> Result<(), reallyme_codec::base64url::Base64UrlError> {
    let encoded = bytes_to_base64url(b"hello");
    let decoded = base64url_to_bytes(&encoded)?;
    assert_eq!(decoded, b"hello");
    Ok(())
}
```

Multikey support treats keys as opaque public bytes plus a multicodec prefix.
Algorithm-aware key parsing, signing, verification, and JWK envelopes live in
the crypto layer that consumes the decoded bytes.

DTOs that carry byte fields as unpadded base64url strings can enable the
`serde` feature and use `reallyme_codec::base64url::serde_bytes` or
`reallyme_codec::base64url::serde_option_bytes`.

## Features

- `base64`
- `base64url`
- `cbor`
- `hex`
- `jcs`
- `multibase`
- `multicodec`
- `multikey`
- `pem`
- `serde`

## Package Contract

ReallyMe Codec is one cross-language codec contract for identity data. The
publishable Rust leaf crates exist for dependency hygiene, implementation
modularity, and crates.io dependency resolution. They are support crates
released in lockstep with `reallyme-codec`.

Rust consumers should usually depend on this umbrella crate. Direct use of a
leaf crate is appropriate only when the consumer deliberately needs a smaller
primitive surface and accepts the same lockstep ReallyMe Codec release line.