Branca Token Builder/Decoder
Generates and decodes Branca tokens (XChaCha20-Poly1305 + base62), modern alternative to Fernet with arbitrary payload.
Estrutura Branca: version(1) || timestamp(4) || nonce(24) || ciphertext || tag(16), tudo em base62. Cifragem: XChaCha20-Poly1305. Esta ferramenta gera estrutura simulada com chave/cipher local — implementação completa requer biblioteca libsodium.
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