Update sjcl and delete custom ripemd160, montgomery, and jacobi

Author: Chris Clark

npm-shrinkwrap.json

@@ -21,7 +21,7 @@
     "lodash": "^3.1.0",
     "lru-cache": "~2.5.0",
     "ripple-wallet-generator": "^1.0.3",
-    "sjcl": "^1.0.2",
+    "sjcl": "^1.0.3",
     "ws": "~0.7.1"
   },
   "devDependencies": {

package.json

@@ -1,11 +1,8 @@
 'use strict';
 require('./sjcl-ecc-pointextras.js');
 require('./sjcl-secp256k1.js');
-require('./sjcl-ripemd160.js');
 require('./sjcl-extramath.js');
-require('./sjcl-montgomery.js');
 require('./sjcl-validecc.js');
 require('./sjcl-ecdsa-canonical.js');
 require('./sjcl-ecdsa-der.js');
 require('./sjcl-ecdsa-recoverablepublickey.js');
-require('./sjcl-jacobi.js');

src/sjcl-custom/index.js

@@ -125,7 +125,7 @@ function recoverPublicKeyPointFromSignature(curve, signature_r, signature_s,
   // Conversion
   var alpha = x.mul(x).mul(x).add(curve.a.mul(x)).add(curve.b).mod(
     field_modulus);
-  var beta = alpha.powermodMontgomery(FIELD_MODULUS_PLUS_ONE_DIVIDED_BY_FOUR,
+  var beta = alpha.powermod(FIELD_MODULUS_PLUS_ONE_DIVIDED_BY_FOUR,
     field_modulus);
 
   // If beta is even but y isn't or