339 lines
13 KiB
JavaScript
339 lines
13 KiB
JavaScript
'use strict';
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(function(GLOBAL) {
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const floCrypto = GLOBAL.floCrypto = {
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util: {
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p: BigInteger("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFC2F", 16),
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ecparams: EllipticCurve.getSECCurveByName("secp256k1"),
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asciiAlternatives: `‘ '\n’ '\n“ "\n” "\n– --\n— ---\n≥ >=\n≤ <=\n≠ !=\n× *\n÷ /\n← <-\n→ ->\n↔ <->\n⇒ =>\n⇐ <=\n⇔ <=>`,
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exponent1: function() {
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return this.p.add(BigInteger.ONE).divide(BigInteger("4"))
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},
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calculateY: function(x) {
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let p = this.p;
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let exp = this.exponent1();
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// x is x value of public key in BigInteger format without 02 or 03 or 04 prefix
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return x.modPow(BigInteger("3"), p).add(BigInteger("7")).mod(p).modPow(exp, p)
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},
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getUncompressedPublicKey: function(compressedPublicKey) {
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const p = this.p;
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// Fetch x from compressedPublicKey
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let pubKeyBytes = Crypto.util.hexToBytes(compressedPublicKey);
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const prefix = pubKeyBytes.shift() // remove prefix
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let prefix_modulus = prefix % 2;
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pubKeyBytes.unshift(0) // add prefix 0
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let x = new BigInteger(pubKeyBytes)
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let xDecimalValue = x.toString()
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// Fetch y
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let y = this.calculateY(x);
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let yDecimalValue = y.toString();
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// verify y value
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let resultBigInt = y.mod(BigInteger("2"));
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let check = resultBigInt.toString() % 2;
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if (prefix_modulus !== check)
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yDecimalValue = y.negate().mod(p).toString();
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return {
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x: xDecimalValue,
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y: yDecimalValue
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};
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},
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getSenderPublicKeyString: function() {
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privateKey = ellipticCurveEncryption.senderRandom();
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senderPublicKeyString = ellipticCurveEncryption.senderPublicString(privateKey);
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return {
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privateKey: privateKey,
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senderPublicKeyString: senderPublicKeyString
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}
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},
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deriveSharedKeySender: function(receiverCompressedPublicKey, senderPrivateKey) {
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let receiverPublicKeyString = this.getUncompressedPublicKey(receiverCompressedPublicKey);
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var senderDerivedKey = ellipticCurveEncryption.senderSharedKeyDerivation(
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receiverPublicKeyString.x, receiverPublicKeyString.y, senderPrivateKey);
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return senderDerivedKey;
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},
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deriveReceiverSharedKey: function(senderPublicKeyString, receiverPrivateKey) {
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return ellipticCurveEncryption.receiverSharedKeyDerivation(
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senderPublicKeyString.XValuePublicString, senderPublicKeyString.YValuePublicString, receiverPrivateKey);
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},
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getReceiverPublicKeyString: function(privateKey) {
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return ellipticCurveEncryption.receiverPublicString(privateKey);
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},
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deriveSharedKeyReceiver: function(senderPublicKeyString, receiverPrivateKey) {
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return ellipticCurveEncryption.receiverSharedKeyDerivation(
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senderPublicKeyString.XValuePublicString, senderPublicKeyString.YValuePublicString, receiverPrivateKey);
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},
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wifToDecimal: function(pk_wif, isPubKeyCompressed = false) {
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let pk = Bitcoin.Base58.decode(pk_wif)
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pk.shift()
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pk.splice(-4, 4)
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//If the private key corresponded to a compressed public key, also drop the last byte (it should be 0x01).
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if (isPubKeyCompressed == true) pk.pop()
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pk.unshift(0)
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privateKeyDecimal = BigInteger(pk).toString()
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privateKeyHex = Crypto.util.bytesToHex(pk)
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return {
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privateKeyDecimal: privateKeyDecimal,
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privateKeyHex: privateKeyHex
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}
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}
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},
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//generate a random Interger within range
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randInt: function(min, max) {
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min = Math.ceil(min);
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max = Math.floor(max);
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return Math.floor(Math.random() * (max - min + 1)) + min;
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},
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//generate a random String within length (options : alphaNumeric chars only)
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randString: function(length, alphaNumeric = true) {
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var result = '';
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if (alphaNumeric)
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var characters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
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else
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var characters =
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'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_+-./*?@#&$<>=[]{}():';
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for (var i = 0; i < length; i++)
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result += characters.charAt(Math.floor(Math.random() * characters.length));
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return result;
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},
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//Encrypt Data using public-key
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encryptData: function(data, receiverCompressedPublicKey) {
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var senderECKeyData = this.util.getSenderPublicKeyString();
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var senderDerivedKey = this.util.deriveSharedKeySender(receiverCompressedPublicKey, senderECKeyData
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.privateKey);
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let senderKey = senderDerivedKey.XValue + senderDerivedKey.YValue;
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let secret = Crypto.AES.encrypt(data, senderKey);
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return {
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secret: secret,
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senderPublicKeyString: senderECKeyData.senderPublicKeyString
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};
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},
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//Decrypt Data using private-key
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decryptData: function(data, myPrivateKey) {
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var receiverECKeyData = {};
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if (typeof myPrivateKey !== "string") throw new Error("No private key found.");
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let privateKey = this.util.wifToDecimal(myPrivateKey, true);
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if (typeof privateKey.privateKeyDecimal !== "string") throw new Error(
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"Failed to detremine your private key.");
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receiverECKeyData.privateKey = privateKey.privateKeyDecimal;
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var receiverDerivedKey = this.util.deriveReceiverSharedKey(data.senderPublicKeyString,
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receiverECKeyData
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.privateKey);
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let receiverKey = receiverDerivedKey.XValue + receiverDerivedKey.YValue;
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let decryptMsg = Crypto.AES.decrypt(data.secret, receiverKey);
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return decryptMsg;
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},
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//Sign data using private-key
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signData: function(data, privateKeyHex) {
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var key = new Bitcoin.ECKey(privateKeyHex);
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key.setCompressed(true);
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var privateKeyArr = key.getBitcoinPrivateKeyByteArray();
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privateKey = BigInteger.fromByteArrayUnsigned(privateKeyArr);
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var messageHash = Crypto.SHA256(data);
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var messageHashBigInteger = new BigInteger(messageHash);
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var messageSign = Bitcoin.ECDSA.sign(messageHashBigInteger, key.priv);
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var sighex = Crypto.util.bytesToHex(messageSign);
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return sighex;
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},
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//Verify signatue of the data using public-key
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verifySign: function(data, signatureHex, publicKeyHex) {
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var msgHash = Crypto.SHA256(data);
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var messageHashBigInteger = new BigInteger(msgHash);
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var sigBytes = Crypto.util.hexToBytes(signatureHex);
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var signature = Bitcoin.ECDSA.parseSig(sigBytes);
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var publicKeyPoint = this.util.ecparams.getCurve().decodePointHex(publicKeyHex);
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var verify = Bitcoin.ECDSA.verifyRaw(messageHashBigInteger, signature.r, signature.s,
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publicKeyPoint);
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return verify;
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},
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//Generates a new flo ID and returns private-key, public-key and floID
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generateNewID: function() {
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try {
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var key = new Bitcoin.ECKey(false);
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key.setCompressed(true);
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return {
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floID: key.getBitcoinAddress(),
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pubKey: key.getPubKeyHex(),
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privKey: key.getBitcoinWalletImportFormat()
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}
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} catch (e) {
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console.error(e);
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}
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},
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//Returns public-key from private-key
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getPubKeyHex: function(privateKeyHex) {
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if (!privateKeyHex)
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return null;
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var key = new Bitcoin.ECKey(privateKeyHex);
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if (key.priv == null)
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return null;
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key.setCompressed(true);
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return key.getPubKeyHex();
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},
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//Returns flo-ID from public-key or private-key
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getFloID: function(keyHex) {
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if (!keyHex)
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return null;
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try {
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var key = new Bitcoin.ECKey(keyHex);
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if (key.priv == null)
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key.setPub(keyHex);
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return key.getBitcoinAddress();
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} catch (e) {
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return null;
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}
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},
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//Verify the private-key for the given public-key or flo-ID
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verifyPrivKey: function(privateKeyHex, pubKey_floID, isfloID = true) {
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if (!privateKeyHex || !pubKey_floID)
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return false;
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try {
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var key = new Bitcoin.ECKey(privateKeyHex);
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if (key.priv == null)
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return false;
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key.setCompressed(true);
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if (isfloID && pubKey_floID == key.getBitcoinAddress())
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return true;
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else if (!isfloID && pubKey_floID == key.getPubKeyHex())
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return true;
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else
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return false;
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} catch (e) {
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console.error(e);
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}
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},
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//Check if the given Address is valid or not
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validateAddr: function(inpAddr) {
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if (!inpAddr)
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return false;
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try {
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var addr = new Bitcoin.Address(inpAddr);
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return true;
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} catch {
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return false;
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}
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},
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//Split the str using shamir's Secret and Returns the shares
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createShamirsSecretShares: function(str, total_shares, threshold_limit) {
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try {
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if (str.length > 0) {
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var strHex = shamirSecretShare.str2hex(str);
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var shares = shamirSecretShare.share(strHex, total_shares, threshold_limit);
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return shares;
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}
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return false;
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} catch {
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return false
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}
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},
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//Verifies the shares and str
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verifyShamirsSecret: function(sharesArray, str) {
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return (str && this.retrieveShamirSecret(sharesArray) === str)
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},
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//Returns the retrived secret by combining the shamirs shares
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retrieveShamirSecret: function(sharesArray) {
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try {
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if (sharesArray.length > 0) {
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var comb = shamirSecretShare.combine(sharesArray.slice(0, sharesArray.length));
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comb = shamirSecretShare.hex2str(comb);
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return comb;
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}
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return false;
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} catch {
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return false;
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}
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},
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validateASCII: function(string, bool = true) {
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if (typeof string !== "string")
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return null;
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if (bool) {
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let x;
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for (let i = 0; i < string.length; i++) {
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x = string.charCodeAt(i);
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if (x < 32 || x > 127)
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return false;
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}
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return true;
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} else {
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let x, invalids = {};
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for (let i = 0; i < string.length; i++) {
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x = string.charCodeAt(i);
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if (x < 32 || x > 127)
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if (x in invalids)
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invalids[string[i]].push(i)
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else
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invalids[string[i]] = [i];
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}
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if (Object.keys(invalids).length)
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return invalids;
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else
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return true;
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}
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},
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convertToASCII: function(string, mode = 'soft-remove') {
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let chars = this.validateASCII(string, false);
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if (chars === true)
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return string;
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else if (chars === null)
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return null;
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let convertor, result = string,
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refAlt = {};
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this.util.asciiAlternatives.split('\n').forEach(a => refAlt[a[0]] = a.slice(2));
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mode = mode.toLowerCase();
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if (mode === "hard-unicode")
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convertor = (c) => `\\u${('000'+c.charCodeAt().toString(16)).slice(-4)}`;
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else if (mode === "soft-unicode")
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convertor = (c) => refAlt[c] || `\\u${('000'+c.charCodeAt().toString(16)).slice(-4)}`;
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else if (mode === "hard-remove")
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convertor = c => "";
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else if (mode === "soft-remove")
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convertor = c => refAlt[c] || "";
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else
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return null;
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for (let c in chars)
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result = result.replaceAll(c, convertor(c));
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return result;
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},
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revertUnicode: function(string) {
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return string.replace(/\\u[\dA-F]{4}/gi,
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m => String.fromCharCode(parseInt(m.replace(/\\u/g, ''), 16)));
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}
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}
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})(typeof global !== "undefined" ? global : window); |