FastWebToken

Small, Fast and simple JWT alternative that uses CBOR for serialization and EdDSA, HMAC, blake2b and blake3 for signing.

Structure

Header	Payload	Signature
1 (SignatureType) + 8 (Payload size) byte	Varies based on the Payload size	32 bytes for HMACSha256, Blake2b256, blake3 or 64 bytes for Ed25519, HMACSha512, Blake2b512 or 114 bytes for Ed448

1. Header: This begins with a single byte that determines the SignatureType. The next eight bytes are the size of the payload encoded in big endian.
2. Payload: Payload that encoded in CBOR format. The size of the payload is specified in the header.
3. Signature: This is either 32, 64 or 114 bytes depending on the SignatureType specified in the header.

Signature Types

• Ed25519: RFC-8032 Ed25519 signature.
• Ed448: RFC-8032 Ed448 signature.
• HMACSha256: HMAC with SHA-256.
• HMACSha512: HMAC with SHA-512.
• Blake2b256: Blake2b with 256-bit output.
• Blake2b512: Blake2b with 512-bit output.
• Blake3: Blake3 with 256-bit output.