Fix ECDH/ECDSA browser tests: restore local curve element length tables

The #26 change replaced the tests' own curve-length tables with calls to
cryptoECC.curveElementLength(). cryptoECC is an internal module inside the
UMD bundle and is not exposed as a global, so SubtleTests.html threw
ReferenceError: cryptoECC is not defined. Restore independent test-local
tables (keeping the new BN-254 entry); the production de-duplication in
ecdh.js/ecdsa.js/cryptoECC.js is unaffected.

Author: ljoy913

test/Test.Ecdh.js

@@ -226,9 +226,18 @@ function ecdhTests() {
     });
 }
 
-function ecdhCurveElementLength(namedCurve) {
-    return cryptoECC.curveElementLength(namedCurve);
-}
+var ecdhKeyLengths = {
+    "P-256": 32,
+    "P-384": 48,
+    "P-521": 66,
+    "BN-254": 32,
+    "NUMSP256D1": 32,
+    "NUMSP256T1": 32,
+    "NUMSP384D1": 48,
+    "NUMSP384T1": 48,
+    "NUMSP512D1": 64,
+    "NUMSP512T1": 64
+};
 
 function ecdhKeyAlg(namedCurve) {
     return {
@@ -241,7 +250,7 @@ var inspectEcdhKey = {
     public: function(keyObj, algorithm, usages, reason) {
 
         var fail = [];
-        var expLenMax = ecdhCurveElementLength(algorithm.namedCurve);
+        var expLenMax = ecdhKeyLengths[algorithm.namedCurve];
         var expLenMin = expLenMax;
 
         // has crv property equal to the algorithm's namedCurve
@@ -300,7 +309,7 @@ var inspectEcdhKey = {
         //     }
         // }
 
-        var expLenMax = ecdhCurveElementLength(algorithm.namedCurve);
+        var expLenMax = ecdhKeyLengths[algorithm.namedCurve];
         var expLenMin = expLenMax;
 
         this.public(keyObj, algorithm, usages, reason);

test/Test.Ecdsa.js

@@ -423,9 +423,18 @@ function ecdsaTests() {
     });
 }
 
-function ecdsaCurveElementLength(namedCurve) {
-    return cryptoECC.curveElementLength(namedCurve);
-}
+var ecdsaKeyLengths = {
+    "P-256": 32,
+    "P-384": 48,
+    "P-521": 66,
+    "BN-254": 32,
+    "NUMSP256D1": 32,
+    "NUMSP256T1": 32,
+    "NUMSP384D1": 48,
+    "NUMSP384T1": 48,
+    "NUMSP512D1": 64,
+    "NUMSP512T1": 64
+};
 
 function ecdsaKeyAlg(curve) {
     return {
@@ -446,7 +455,7 @@ var inspectEcdsaKey = {
 
         var fail = [];
 
-        var expLenMax = ecdsaCurveElementLength(algorithm.namedCurve);
+        var expLenMax = ecdsaKeyLengths[algorithm.namedCurve];
         var expLenMin = expLenMax;
 
         // has crv property equal to the algorithm's namedCurve
@@ -489,7 +498,7 @@ var inspectEcdsaKey = {
     },
     private: function(keyObj, algorithm, usages, reason) {
 
-        var expLenMax = ecdsaCurveElementLength(algorithm.namedCurve);
+        var expLenMax = ecdsaKeyLengths[algorithm.namedCurve];
         var expLenMin = expLenMax;
 
         this.public(keyObj, algorithm, usages, reason);