CVS: crypto/test test_publickey.py,1.3,1.4

Update of /cvsroot/pycrypto/crypto/test
In directory sc8-pr-cvs1:/tmp/cvs-serv28257

Modified Files:
	test_publickey.py 
Log Message:
Add test cases for blinding

Index: test_publickey.py
===================================================================
RCS file: /cvsroot/pycrypto/crypto/test/test_publickey.py,v
retrieving revision 1.3
retrieving revision 1.4
diff -u -r1.3 -r1.4
--- test_publickey.py	28 Feb 2003 15:24:01 -0000	1.3
+++ test_publickey.py	3 Apr 2003 20:27:41 -0000	1.4
@@ -49,6 +49,27 @@
             pubonly=key.publickey()
             self.test_bool('pubonly.verify(plaintext, signature)')
 
+        # Test blinding
+        if key.canblind():
+            if verbose: print '  Blinding test'
+            K=number.getPrime(30, randfunc)
+            B="garbage"
+            blindedtext=key.blind(plaintext, B)
+            signature=key.sign(blindedtext, K)
+            unblindedsignature=(key.unblind(signature[0], B),)
+            self.test_bool('key.verify(plaintext, unblindedsignature)')
+            self.test_val('key.sign(plaintext, K)', unblindedsignature)
+
+            # Change a single bit in the blinding factor
+            badB=B[:-3]+chr( 1 ^ ord(B[-3]) )+B[-3:]
+            badunblindedsignature=(key.unblind(signature[0], badB),)
+            self.test_false('key.verify(badtext, badunblindedsignature)')
+
+            badblindedtext=key.blind(plaintext, badB)
+            badsignature=key.sign(blindedtext, K)
+            badunblindedsignature2=(key.unblind(signature[0], B),)
+            self.test_false('key.verify(badtext, badunblindedsignature2)')
+
 
     def exercise (self, randfunc, pk_mod, verbose=0):
         N=256                           # Key size, measured in bits



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