signer_doc.md

Signature and verification

This document describes examples of signing and verification with a key pair using the NosoDart library.

Table of contents

• Check for key pair matching
• Signing message or creating an ECSignature
• Verification of the signed message

Check for key pair matching

This example demonstrates how to perform a key-pair matching check.

bool isMatching = NosoSigner().verifyKeysPair(KeyPair(publicKey: "examplePublic", privateKey: "examplePrivate"));

The verifyKeysPair() method will return true if the key match is confirmed, otherwise it will return false.

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Signing message or creating an ECSignature

This example explains how to create an ECSignature signature and convert it to Base64. Or just sign the message for further verification.

ECSignature? ecSignature = NosoSigner().signMessage("exampleMessage", "examplePrivatKey");

The signMessage() method will return a valid ECSignature if no exceptions occurred in the process, otherwise null will be returned;

How to encode ECSignature to Base64

String signatureString = NosoSigner().encodeSignatureToBase64(ecSignature);

How to decode Base64 to ECSignature

ECSignature decodeEcSignature = NosoSigner().decodeBase64ToSignature(signatureString);

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Verification of the signed message

This example demonstrates how to verify a signed message.

bool isVerified = NosoSigner().verifySignedString("exampleMessage", ecSignature, "examplePublickKey");

The verifySignedString() method will return true if the message signature is confirmed, otherwise it will return false;

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