Introduce some checks to indicate that the benchmarks have run correctly....

benchmarks/crypto.js

Index: benchmarks/crypto.js
===================================================================
--- benchmarks/crypto.js	(revision 362)
+++ benchmarks/crypto.js	(working copy)
@@ -1674,16 +1674,23 @@
 
 setupEngine(am3, 28);
 
-var RSA = new RSAKey();
-var TEXT = "The quick brown fox jumped over the extremely lazy frogs!";
+var TEXT = "The quick brown fox jumped over the extremely lazy frog! " +
+    "Now is the time for all good men to come to the party.";
+var encrypted;
 
-RSA.setPublic(nValue, eValue);
-RSA.setPrivateEx(nValue, eValue, dValue, pValue, qValue, dmp1Value, dmq1Value, coeffValue);
-
 function encrypt() {
-  return RSA.encrypt(TEXT);
+  var RSA = new RSAKey();
+  RSA.setPublic(nValue, eValue);
+  RSA.setPrivateEx(nValue, eValue, dValue, pValue, qValue, dmp1Value, dmq1Value, coeffValue);
+  encrypted = RSA.encrypt(TEXT);
 }
 
 function decrypt() {
-  return RSA.decrypt(TEXT);
+  var RSA = new RSAKey();
+  RSA.setPublic(nValue, eValue);
+  RSA.setPrivateEx(nValue, eValue, dValue, pValue, qValue, dmp1Value, dmq1Value, coeffValue);
+  var decrypted = RSA.decrypt(encrypted);
+  if (decrypted != TEXT) {
+    throw new Error("Crypto operation failed");
+  }
 }