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Add sign, _emsaPSS and _modPowe methods in Key.js file

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Vladislav Hristov 2018-05-31 11:33:59 +03:00
parent 7e6e2ff142
commit 5ace213723
1 changed files with 44 additions and 3 deletions
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47
lib/Key.js
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@ -2,8 +2,10 @@
const crypto = require('crypto');
const NodeRSA = require("node-rsa");
const BN = require('bn.js');
const NodeRSA = require("node-rsa");
const MGF1 = require('./MGF1');
module.exports = class Key {
constructor(encodedKey, passphrase = null) {
@ -20,8 +22,8 @@ module.exports = class Key {
return crypto.createHash('sha256').update(str).digest('base64').trim();
};
publicEncrypt(str) {
return this.key.encrypt(str);
publicEncrypt(buf) {
return crypto.publicEncrypt({ 'key': this.toPem(), padding: crypto.constants.RSA_PKCS1_PADDING }, buf);
}
n() {
@ -35,4 +37,43 @@ module.exports = class Key {
toPem() {
return this.key.isPrivate() ? this.key.exportKey("pkcs1-private-pem") : this.key.exportKey("pkcs8-public-pem");
}
sign(msg, salt = crypto.randomBytes(32)) {
const base = new BN(this._emsaPSS(msg, salt));
const power = new BN(this.key.keyPair.d.toBuffer());
const mod = new BN(this.key.keyPair.n.toBuffer());
return (this._modPow(base, power, mod)).toBuffer().toString('base64');
}
_emsaPSS(msg, salt) {
const eightNullBytes = Buffer.from("\x00".repeat(8));
const digestedMsg = crypto.createHash('sha256').update(msg).digest();
const mTickHash = crypto.createHash('sha256').update(Buffer.concat([eightNullBytes, digestedMsg, salt]), 'binary').digest();
const ps = Buffer.from("\x00".repeat(190));
const db = Buffer.concat([ps, Buffer.from("\x01"), salt]);
const dbMask = MGF1.generate(mTickHash, db.length);
const maskedDb = MGF1.xor(db, dbMask); // so far so good
let maskedDbMsb = (new MGF1)._rjust(new BN(maskedDb.slice(0, 1), 2).toString(2), 8, "0");
maskedDbMsb = "0" + maskedDbMsb.substr(1);
maskedDb[0] = (new BN(maskedDbMsb, 2).toBuffer())[0];
return Buffer.concat([maskedDb, mTickHash, Buffer.from('BC', 'hex')]);
}
_modPow(base, power, mod) {
let result = new BN(1);
while( power > 0 ) {
result = power.and(new BN(1)) == 1 ? (result.mul(base)).mod(mod) : result;
base = (base.mul(base)).mod(mod);
power = power.shrn(1);
}
return result;
}
};