1 files changed, 122 insertions, 0 deletions
diff --git a/node_modules/create-ecdh/browser.js b/node_modules/create-ecdh/browser.js
new file mode 100644
index 000000000..c24c97526
--- /dev/null
+++ b/node_modules/create-ecdh/browser.js
@@ -0,0 +1,122 @@
+var elliptic = require('elliptic');
+var BN = require('bn.js');
+
+module.exports = function createECDH(curve) {
+	return new ECDH(curve);
+};
+
+var aliases = {
+	secp256k1: {
+		name: 'secp256k1',
+		byteLength: 32
+	},
+	secp224r1: {
+		name: 'p224',
+		byteLength: 28
+	},
+	prime256v1: {
+		name: 'p256',
+		byteLength: 32
+	},
+	prime192v1: {
+		name: 'p192',
+		byteLength: 24
+	},
+	ed25519: {
+		name: 'ed25519',
+		byteLength: 32
+	},
+	secp384r1: {
+		name: 'p384',
+		byteLength: 48
+	},
+	secp521r1: {
+		name: 'p521',
+		byteLength: 66
+	}
+};
+
+aliases.p224 = aliases.secp224r1;
+aliases.p256 = aliases.secp256r1 = aliases.prime256v1;
+aliases.p192 = aliases.secp192r1 = aliases.prime192v1;
+aliases.p384 = aliases.secp384r1;
+aliases.p521 = aliases.secp521r1;
+
+function ECDH(curve) {
+	this.curveType = aliases[curve];
+	if (!this.curveType ) {
+		this.curveType = {
+			name: curve
+		};
+	}
+	this.curve = new elliptic.ec(this.curveType.name);
+	this.keys = void 0;
+}
+
+ECDH.prototype.generateKeys = function (enc, format) {
+	this.keys = this.curve.genKeyPair();
+	return this.getPublicKey(enc, format);
+};
+
+ECDH.prototype.computeSecret = function (other, inenc, enc) {
+	inenc = inenc || 'utf8';
+	if (!Buffer.isBuffer(other)) {
+		other = new Buffer(other, inenc);
+	}
+	var otherPub = this.curve.keyFromPublic(other).getPublic();
+	var out = otherPub.mul(this.keys.getPrivate()).getX();
+	return formatReturnValue(out, enc, this.curveType.byteLength);
+};
+
+ECDH.prototype.getPublicKey = function (enc, format) {
+	var key = this.keys.getPublic(format === 'compressed', true);
+	if (format === 'hybrid') {
+		if (key[key.length - 1] % 2) {
+			key[0] = 7;
+		} else {
+			key [0] = 6;
+		}
+	}
+	return formatReturnValue(key, enc);
+};
+
+ECDH.prototype.getPrivateKey = function (enc) {
+	return formatReturnValue(this.keys.getPrivate(), enc);
+};
+
+ECDH.prototype.setPublicKey = function (pub, enc) {
+	enc = enc || 'utf8';
+	if (!Buffer.isBuffer(pub)) {
+		pub = new Buffer(pub, enc);
+	}
+	this.keys._importPublic(pub);
+	return this;
+};
+
+ECDH.prototype.setPrivateKey = function (priv, enc) {
+	enc = enc || 'utf8';
+	if (!Buffer.isBuffer(priv)) {
+		priv = new Buffer(priv, enc);
+	}
+	var _priv = new BN(priv);
+	_priv = _priv.toString(16);
+	this.keys._importPrivate(_priv);
+	return this;
+};
+
+function formatReturnValue(bn, enc, len) {
+	if (!Array.isArray(bn)) {
+		bn = bn.toArray();
+	}
+	var buf = new Buffer(bn);
+	if (len && buf.length < len) {
+		var zeros = new Buffer(len - buf.length);
+		zeros.fill(0);
+		buf = Buffer.concat([zeros, buf]);
+	}
+	if (!enc) {
+		return buf;
+	} else {
+		return buf.toString(enc);
+	}
+}