example of crypto skipping

foo.diff

diff --git test/common.js test/common.js
index 352f7b6..2efd987 100644
--- test/common.js
+++ test/common.js
@@ -10,6 +10,13 @@ exports.libDir = path.join(exports.testDir, '../lib');
 exports.tmpDirName = 'tmp';
 exports.PORT = +process.env.NODE_COMMON_PORT || 12346;
 
+exports.hasCrypto = true;
+try {
+  var crypto = require('crypto');
+} catch (e) {
+  exports.hasCrypto = false;
+}
+
 if (process.env.TEST_THREAD_ID) {
   // Distribute ports in parallel tests
   if (!process.env.NODE_COMMON_PORT)
diff --git test/parallel/test-buffer.js test/parallel/test-buffer.js
index 1c2c425..509cb85 100644
--- test/parallel/test-buffer.js
+++ test/parallel/test-buffer.js
@@ -1108,16 +1108,21 @@ assert.throws(function () {
   new SlowBuffer(smalloc.kMaxLength + 1);
 }, RangeError);
 
-// Test truncation after decode
-var crypto = require('crypto');
 
-var b1 = new Buffer('YW55=======', 'base64');
-var b2 = new Buffer('YW55', 'base64');
+if(common.hasCrypto) {
+  // Test truncation after decode
+  var crypto = require('crypto');
 
-assert.equal(
-  crypto.createHash('sha1').update(b1).digest('hex'),
-  crypto.createHash('sha1').update(b2).digest('hex')
-);
+  var b1 = new Buffer('YW55=======', 'base64');
+  var b2 = new Buffer('YW55', 'base64');
+
+  assert.equal(
+    crypto.createHash('sha1').update(b1).digest('hex'),
+    crypto.createHash('sha1').update(b2).digest('hex')
+  );
+} else {
+  console.log('cryptographic functions not available. skipping test');
+}
 
 // Test Compare
 var b = new Buffer(1).fill('a');