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JS Crypto Utils - secp256k1 EC cryptography and blockchain functions
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| const CryptoJS = require("crypto-js"); | |
| const EC = require('elliptic').ec; | |
| const secp256k1 = new EC('secp256k1'); | |
| function publicKeyToAddress(pubKey) { | |
| let address = CryptoJS.RIPEMD160(pubKey).toString(); | |
| return address; | |
| } | |
| function privateKeyToPublicKey(privKey) { | |
| let keyPair = secp256k1.keyFromPrivate(privKey); | |
| let pubKey = keyPair.getPublic().getX().toString(16) + | |
| (keyPair.getPublic().getY().isOdd() ? "1" : "0"); | |
| return pubKey; | |
| } | |
| function privateKeyToAddress(privKey) { | |
| let pubKey = privateKeyToPublicKey(privKey); | |
| let address = publicKeyToAddress(pubKey); | |
| return address; | |
| } | |
| function signData(data, privKey) { | |
| let keyPair = secp256k1.keyFromPrivate(privKey); | |
| let signature = keyPair.sign(data); | |
| return [signature.r.toString(16), signature.s.toString(16)]; | |
| } | |
| function decompressPublicKey(pubKeyCompressed) { | |
| let pubKeyX = pubKeyCompressed.substring(0, 64); | |
| let pubKeyYOdd = parseInt(pubKeyCompressed.substring(64)); | |
| let pubKeyPoint = secp256k1.curve.pointFromX(pubKeyX, pubKeyYOdd); | |
| return pubKeyPoint; | |
| } | |
| function verifySignature(data, publicKey, signature) { | |
| let pubKeyPoint = decompressPublicKey(publicKey); | |
| let keyPair = secp256k1.keyPair({pub: pubKeyPoint}); | |
| let valid = keyPair.verify(data, {r: signature[0], s: signature[1]}); | |
| return valid; | |
| } | |
| function sha256(data) { | |
| return CryptoJS.SHA256(data).toString(); | |
| } | |
| module.exports = { | |
| publicKeyToAddress, | |
| privateKeyToPublicKey, | |
| privateKeyToAddress, | |
| signData, | |
| verifySignature, | |
| sha256 | |
| }; |
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