Signature verification

Focus: one signature-checking entry that verifies a signed byte message from the transaction sender.

Open in Playground 

entry verify_from_sender(message: bytes, signature: Signature) -> bool {
    let sender: Address = Transaction::current().unwrap().source()
    return signature.verify(message, sender.to_point())
}

How it works

• message: bytes is the exact byte payload the wallet signed.
• signature: Signature is verified inside the contract.
• Transaction::current().unwrap().source() gets the transaction sender address.
• sender.to_point() converts the address into the public key point expected by signature.verify.
• The entry returns true only when the signature matches the sender and message.

Use wallet RPC sign_data to produce signatures for verify_from_sender.