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28 lines
1.0 KiB
28 lines
1.0 KiB
2 years ago
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# Signer
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Elliptic curve cryptography is used in most blockchain projects to sign transactions. Using Node.js base library we will practise simple signatures.
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### Instructions
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- Create a function `init()` that generates a cryptographic key pair on any elliptic curve and returns the public key in any format.
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- Create a function `signer(message)` that takes as arguments a message and returns the signature of the message (using the `sha256` algorithm and the keys generated with init).
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- create a function `verifier(message, pubKey, signature)` that takes as arguments a message, a public key and a signature and returns a boolean if the signature is valid.
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### Usage
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```js
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const message = "This is a message to sign";
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const pubKey = init();
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const signature = signer(message);
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console.log(verifier(message, pubKey, signature));
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// expected result :
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// true
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```
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### Notions
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- [Module crypto, sign](https://nodejs.org/docs/latest-v14.x/api/crypto.html#crypto_class_sign)
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- [ECDSA](https://cryptobook.nakov.com/digital-signatures/ecdsa-sign-verify-messages)
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