library/uniffi.xmtpv3/ethereumSignRecoverable

ethereumSignRecoverable

fun ethereumSignRecoverable(msg: ByteArray, privateKey32: ByteArray, hashing: Boolean): ByteArray

  1. Ethereum recoverable signature (FFI). Returns 65 bytes r || s || v, with v ∈ {27,28} (legacy/Electrum encoding where v = 27 + parity, parity ∈ {0,1}).

  • If hashing == true: signs per EIP-191 ("Ethereum Signed Message:\n{len(msg)}" || msg, then keccak256).

  • If hashing == false: msg must be a 32-byte prehash (e.g., keccak256/EIP-712 digest).

  • Private key is automatically zeroized after signing for security