Signs a message with an Ed25519 private key (asynchronous variant of sign; same contract).
The bytes to sign.
32-byte Ed25519 private key.
A Promise resolving to the 64-byte signature.
TypeError if an input length is invalid.
TypeError
RangeError if an input length is invalid.
RangeError
Signs a message with an Ed25519 private key (asynchronous variant of sign; same contract).