Enum SigningCredential 

pub enum SigningCredential {
    Hmac(Credential),
    Ed25519(Box<Ed25519Credential>),
}

Unified signing credential that auto-detects Ed25519 vs HMAC key type.

Binance supports two signing methods:

• HMAC SHA256 (hex-encoded signature) for REST API and standard WebSocket
• Ed25519 (base64-encoded signature) for WebSocket API and SBE streams

The key type is detected from the secret format: if the secret decodes as valid base64 with 32+ bytes (raw seed or PKCS#8), Ed25519 is used. Otherwise HMAC is used.

Variants

Hmac(Credential)

HMAC SHA256 signing.

Ed25519(Box<Ed25519Credential>)

Ed25519 signing.

Implementations

impl SigningCredential

pub fn new(api_key: String, api_secret: String) -> Self

Creates a new signing credential, auto-detecting Ed25519 vs HMAC.

Tries Ed25519 first (base64-decoded secret must be a valid Ed25519 key). Falls back to HMAC if Ed25519 parsing fails.

pub fn api_key(&self) -> &str

Returns the API key.

pub fn sign(&self, message: &str) -> String

Signs a message string and returns the signature.

For HMAC: returns lowercase hex digest. For Ed25519: returns base64-encoded signature.

pub fn is_ed25519(&self) -> bool

Returns whether this credential uses Ed25519 signing.

Trait Implementations

impl Clone for SigningCredential

fn clone(&self) -> SigningCredential

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for SigningCredential

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.