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28 lines
936 B
28 lines
936 B
const utils = require('ethereumjs-util');
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/**
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* Hash and add same prefix to the hash that ganache use.
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* @param {string} message the plaintext/ascii/original message
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* @return {string} the hash of the message, prefixed, and then hashed again
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*/
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function hashMessage (message) {
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const messageHex = Buffer.from(utils.sha3(message).toString('hex'), 'hex');
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const prefix = utils.toBuffer('\u0019Ethereum Signed Message:\n' + messageHex.length.toString());
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return utils.bufferToHex(utils.sha3(Buffer.concat([prefix, messageHex])));
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}
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// signs message using web3 (auto-applies prefix)
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function signMessage (signer, message = '', options = {}) {
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return web3.eth.sign(signer, web3.sha3(message, options));
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}
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// signs hex string using web3 (auto-applies prefix)
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function signHex (signer, message = '') {
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return signMessage(signer, message, { encoding: 'hex' });
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}
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module.exports = {
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hashMessage,
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signMessage,
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signHex,
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};
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