CVS: crypto/PublicKey RSA.py,1.12,1.13 __init__.py,1.3,1.4 pubkey.py,1.8,1.9

Update of /cvsroot/pycrypto/crypto/PublicKey
In directory sc8-pr-cvs1:/tmp/cvs-serv28086

Modified Files:
	RSA.py __init__.py pubkey.py 
Log Message:
Add support for RSA blinding

Index: RSA.py
===================================================================
RCS file: /cvsroot/pycrypto/crypto/PublicKey/RSA.py,v
retrieving revision 1.12
retrieving revision 1.13
diff -u -r1.12 -r1.13
--- RSA.py	3 Apr 2003 18:19:05 -0000	1.12
+++ RSA.py	3 Apr 2003 20:27:13 -0000	1.13
@@ -83,6 +83,23 @@
         if m2[0]==M: return 1
         else: return 0
 
+    def _blind(self, M, B):
+        tmp = pow(B, self.e, self.n)
+        return (M * tmp) % self.n
+
+    def _unblind(self, M, B):
+        tmp = pubkey.inverse(B, self.n)
+        return  (M * tmp) % self.n
+
+    def canblind (self):
+        """canblind() : bool
+        Return a Boolean value recording whether this algorithm can
+        blind data.  (This does not imply that this
+        particular key object has the private information required to
+        to blind a message.)
+        """
+        return 1
+
     def size(self):
         """size() : int
         Return the maximum number of bits that can be handled by this key.
@@ -150,6 +167,15 @@
 
     def _verify(self, M, sig):
         return self.key._verify(M, sig[0])
+
+    def _blind(self, M, B):
+        return self.key._blind(M, B)
+
+    def _unblind(self, M, B):
+        return self.key._unblind(M, B)
+
+    def canblind (self):
+        return 1
 
     def size(self):
         return self.key.size()

Index: __init__.py
===================================================================
RCS file: /cvsroot/pycrypto/crypto/PublicKey/__init__.py,v
retrieving revision 1.3
retrieving revision 1.4
diff -u -r1.3 -r1.4
--- __init__.py	11 Jul 2002 14:31:19 -0000	1.3
+++ __init__.py	3 Apr 2003 20:27:13 -0000	1.4
@@ -7,7 +7,7 @@
 
 Crypto.PublicKey.DSA      Digital Signature Algorithm. (Signature only)
 Crypto.PublicKey.ElGamal  (Signing and encryption)
-Crypto.PublicKey.RSA      (Signing and encryption)
+Crypto.PublicKey.RSA      (Signing, encryption, and blinding)
 Crypto.PublicKey.qNEW     (Signature only)
 
 """

Index: pubkey.py
===================================================================
RCS file: /cvsroot/pycrypto/crypto/PublicKey/pubkey.py,v
retrieving revision 1.8
retrieving revision 1.9
diff -u -r1.8 -r1.9
--- pubkey.py	28 Feb 2003 15:25:11 -0000	1.8
+++ pubkey.py	3 Apr 2003 20:27:13 -0000	1.9
@@ -88,6 +88,31 @@
         warnings.warn("validate() method name is obsolete; use verify()",
                       DeprecationWarning)
 
+    def blind(self, M, B):
+        """blind(M : string|long, B : string|long) : string|long
+        Blind message M using blinding factor B.
+        """
+        wasString=0
+        if isinstance(M, types.StringType):
+            M=bytes_to_long(M) ; wasString=1
+        if isinstance(B, types.StringType): B=bytes_to_long(B)
+        blindedmessage=self._blind(M, B)
+        if wasString: return long_to_bytes(blindedmessage)
+        else: return blindedmessage
+
+    def unblind(self, M, B):
+        """unblind(M : string|long, B : string|long) : string|long
+        Unblind message M using blinding factor B.
+        """
+        wasString=0
+        if isinstance(M, types.StringType):
+            M=bytes_to_long(M) ; wasString=1
+        if isinstance(B, types.StringType): B=bytes_to_long(B)
+        unblindedmessage=self._unblind(M, B)
+        if wasString: return long_to_bytes(unblindedmessage)
+        else: return unblindedmessage
+
+
     # The following methods will usually be left alone, except for
     # signature-only algorithms.  They both return Boolean values
     # recording whether this key's algorithm can sign and encrypt.
@@ -108,6 +133,15 @@
         to decrypt a message.)
         """
         return 1
+
+    def canblind (self):
+        """canblind() : bool
+        Return a Boolean value recording whether this algorithm can
+        blind data.  (This does not imply that this
+        particular key object has the private information required to
+        to blind a message.)
+        """
+        return 0
 
     # The following methods will certainly be overridden by
     # subclasses.



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