initial commit

node_modules/browserify-rsa/index.js

@@ -0,0 +1,38 @@
+'use strict';
+
+var BN = require('bn.js');
+var randomBytes = require('randombytes');
+var Buffer = require('safe-buffer').Buffer;
+
+function getr(priv) {
+	var len = priv.modulus.byteLength();
+	var r;
+	do {
+		r = new BN(randomBytes(len));
+	} while (r.cmp(priv.modulus) >= 0 || !r.umod(priv.prime1) || !r.umod(priv.prime2));
+	return r;
+}
+
+function blind(priv) {
+	var r = getr(priv);
+	var blinder = r.toRed(BN.mont(priv.modulus)).redPow(new BN(priv.publicExponent)).fromRed();
+	return { blinder: blinder, unblinder: r.invm(priv.modulus) };
+}
+
+function crt(msg, priv) {
+	var blinds = blind(priv);
+	var len = priv.modulus.byteLength();
+	var blinded = new BN(msg).mul(blinds.blinder).umod(priv.modulus);
+	var c1 = blinded.toRed(BN.mont(priv.prime1));
+	var c2 = blinded.toRed(BN.mont(priv.prime2));
+	var qinv = priv.coefficient;
+	var p = priv.prime1;
+	var q = priv.prime2;
+	var m1 = c1.redPow(priv.exponent1).fromRed();
+	var m2 = c2.redPow(priv.exponent2).fromRed();
+	var h = m1.isub(m2).imul(qinv).umod(p).imul(q);
+	return m2.iadd(h).imul(blinds.unblinder).umod(priv.modulus).toArrayLike(Buffer, 'be', len);
+}
+crt.getr = getr;
+
+module.exports = crt;