Module auth 

API authentication and cryptographic signing utilities.

Provides cryptographic functions for exchange API authentication:

• HMAC signing (SHA256/SHA512/SHA384/MD5)
• Hash functions (SHA256/SHA512/SHA384/SHA1/MD5/Keccak)
• RSA signing (PKCS1v15)
• EdDSA signing (Ed25519)
• JWT token generation
• Base64 encoding/decoding utilities

Enums

DigestFormat

Output encoding format for cryptographic digests.

HashAlgorithm

Supported cryptographic hash algorithms.

Functions

base64_to_base64url

Converts standard Base64 to Base64 URL format.

base64url_decode

Decodes a Base64 URL-encoded string.

eddsa_sign

Generates an EdDSA signature using Ed25519.

hash

Computes a cryptographic hash (one-way, keyless).

hmac_sign

Generates an HMAC signature for a message.

jwt_sign

Generates a JWT (JSON Web Token).