CVS: crypto/test test_hashes.py,1.4,1.5

Update of /cvsroot/pycrypto/crypto/test
In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv15214/test

Modified Files:
	test_hashes.py 
Log Message:
Test SHA256 on 512Mb and 520 Mb of zeros

Index: test_hashes.py
===================================================================
RCS file: /cvsroot/pycrypto/crypto/test/test_hashes.py,v
retrieving revision 1.4
retrieving revision 1.5
diff -u -r1.4 -r1.5
--- test_hashes.py	13 Aug 2004 22:23:12 -0000	1.4
+++ test_hashes.py	29 Nov 2005 18:12:11 -0000	1.5
@@ -39,7 +39,20 @@
         self.test_val('obj.digest()', result)
         self.test_val('obj.copy().digest()', result)
 
+    def hash_large_file (self, hash_mod, size, hex_result):
+        obj = hash_mod.new()
+        zeros = 1024*1024*10*'\0'        
+        count = 0
 
+        while count < size:
+            diff = size-count
+            block_size = min(diff, len(zeros))
+            obj.update(zeros[:block_size])
+            count += block_size
+
+        self.test_val('obj.hexdigest()', hex_result)
+        
+        
     def run_test_suite (self, hash_mod, test_vectors):
         for text, digest in test_vectors:
             self.compare(hash_mod, text, digest)
@@ -84,8 +97,12 @@
     def check_sha256 (self):
         "SHA256 module"
         self.run_test_suite(SHA256,testdata.sha256)
+        self.hash_large_file(SHA256, 512 * 1024 * 1024,
+                             '9acca8e8c22201155389f65abbf6bc9723edc7384ead80503839f49dcc56d767')
+        self.hash_large_file(SHA256, 520 * 1024 * 1024,
+                             'abf51ad954b246009dfe5a50ecd582fd5b8f1b8b27f30393853c3ef721e7fa6e')
         self.benchmark(SHA256)
-
+        
 # class HashTest
 
 



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