JavaScript Crypto Libraries

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JavaScript Crypto Libraries
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Cryptography in JavaScript
ECDSA with elliptic.js and js-sha3
ECDSA in JavaScript: Generate / Load Keys
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npm install elliptic
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npm install js-sha3
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let elliptic = require('elliptic');
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let sha3 = require('js-sha3');
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let ec = new elliptic.ec('secp256k1');
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​
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// let keyPair = ec.genKeyPair(); // Generate random keys
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let keyPair = ec.keyFromPrivate(
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 "97ddae0f3a25b92268175400149d65d6887b9cefaf28ea2c078e05cdc15a3c0a");
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let privKey = keyPair.getPrivate("hex");
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let pubKey = keyPair.getPublic();
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console.log(`Private key: ${privKey}`);
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console.log("Public key :", pubKey.encode("hex").substr(2));
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console.log("Public key (compressed):",
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    pubKey.encodeCompressed("hex"));
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Run the above code example: https://repl.it/@nakov/ECDSA-in-JS.
ECDSA in JavaScript: Sign Message
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let msg = 'Message for signing';
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let msgHash = sha3.keccak256(msg);
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let signature = 
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  ec.sign(msgHash, privKey, "hex", {canonical: true});
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​
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console.log(`Msg: ${msg}`);
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console.log(`Msg hash: ${msgHash}`);
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console.log("Signature:", signature);
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Run the above code example: https://repl.it/@nakov/ECDSA-sign-verify-in-JS.
Complete example: https://gist.github.com/nakov/1dcbe26988e18f7a4d013b65d8803ffc.
ECDSA in JavaScript: Verify Signature
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let hexToDecimal = (x) => ec.keyFromPrivate(x, "hex")
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  .getPrivate().toString(10);
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let pubKeyRecovered = ec.recoverPubKey(
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  hexToDecimal(msgHash), signature,
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  signature.recoveryParam, "hex");
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console.log("Recovered pubKey:",
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  pubKeyRecovered.encodeCompressed("hex"));
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let validSig = ec.verify(
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  msgHash, signature, pubKeyRecovered);
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console.log("Signature valid?", validSig);
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Run the above code example: https://repl.it/@nakov/ECDSA-sign-verify-in-JS.
Complete example: https://gist.github.com/nakov/1dcbe26988e18f7a4d013b65d8803ffc​

Crypto Libraries for Developers

Python Crypto Libraries

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JavaScript Crypto Libraries

Cryptography in JavaScript

ECDSA in JavaScript: Generate / Load Keys

ECDSA in JavaScript: Verify Signature