Adding mapbox-gl branch

mapbox-gl/closure-library/shamcs.py

@@ -0,0 +1,63 @@
+"""Script to generate MC tests for Closure SHA functions"""
+
+from binascii import hexlify
+from hashlib import sha1, sha224, sha256, sha384, sha512
+
+from Crypto.Cipher import AES
+
+C = AES.new('Closure Library SHA KATs        ')
+MC_START = ''.join(C.encrypt(('MC' * 15) + '\x00' + chr(i)) for i in range(16))
+
+
+TEST_TEMPLATE = '''\
+function test{shatitle}() {{
+  var sha = new goog.crypt.{shatitle}();
+  var initial_state = '{initial_state}';
+  var count = {count};
+  var state = goog.crypt.stringToByteArray(initial_state);
+  var digest;
+  for (var i = 0; i < count; i++) {{
+    sha.reset();
+    sha.update(state);
+    digest = sha.digest();
+    state = goog.array.concat(digest, state);
+  }}
+  assertEquals({lenfinal}, state.length);
+  assertEquals('{expected}',
+    goog.crypt.byteArrayToHex(digest));
+  sha.reset();
+  for (var i = 0; i < ({lenfinal} + 10); i++) {{
+    sha.update(state, i);
+  }}
+  assertEquals('{expected2}',
+    goog.crypt.byteArrayToHex(sha.digest()));
+}}
+'''
+
+def genmc(sha, name, blocklen, digestlen):
+    """Generate a Monte Carlo test for each SHA instance."""
+    count = (2 ** 15) // digestlen
+    state = name
+    for i in range(count):
+        digest = sha(state).digest()
+        state = digest + state
+    final_state = state
+    lenfinal = len(final_state)
+    h = sha()
+    for i in range(len(final_state) + 10):
+        h.update(final_state[:i])
+    print(TEST_TEMPLATE.format(initial_state=name, count=count,
+                               lenfinal=len(final_state),
+                               expected=hexlify(digest),
+                               shatitle=name,
+                               expected2=hexlify(h.digest())))
+
+
+SHAS = [(sha1, 'Sha1', 64, 160//8),
+        (sha224, 'Sha224', 64, 224//8),
+        (sha256, 'Sha256', 64, 256//8),
+        (sha384, 'Sha384', 128, 384//8),
+        (sha512, 'Sha512', 128, 512//8)]
+
+for s in SHAS:
+    genmc(*s)