cryptix.provider.key
Class IDEAKeyGenerator
java.lang.Object
|
+--java.security.KeyGenerator
|
+--cryptix.provider.key.RawKeyGenerator
|
+--cryptix.provider.key.IDEAKeyGenerator
- public class IDEAKeyGenerator
- extends RawKeyGenerator
A key generator for IDEA.
IDEA keys have a fixed length of 128 bits.
References:
-
Copyright © 1997
Systemics Ltd on behalf of the
Cryptix Development Team.
All rights reserved.
$Revision: 1.1.1.1 $
- Since:
- Cryptix 2.2.0a, 2.2.2
- Author:
- David Hopwood
Method Summary |
boolean |
isWeak(byte[] key)
Returns true iff the byte array key represents a
weak IDEA key. |
Methods inherited from class cryptix.provider.key.RawKeyGenerator |
engineGenerateKey,
generateKey,
generateKey,
getDefaultKeyLength,
getMaximumKeyLength,
getMinimumKeyLength,
initialize,
initialize,
isValidKeyLength,
isWeakAllowed,
setWeakAllowed |
Methods inherited from class java.security.KeyGenerator |
clone,
engineGetParameter,
engineSetParameter,
getAlgorithm,
getAlgorithms,
getAlgorithms,
getInstance,
getInstance,
getParameter,
setParameter,
toString |
IDEAKeyGenerator
public IDEAKeyGenerator()
isWeak
public boolean isWeak(byte[] key)
- Returns true iff the byte array key represents a
weak IDEA key.
IDEA has two non-overlapping classes of weak keys (bit numbering
is from left to right, e.g. 0 denotes the most significant bit of
the first byte):
- Keys with zeros in bit positions 0-25, 29-71, and 75-110
(inclusive) and any value in bits 26-28, 72-74, and 111-127.
There are 2^23 weak keys in this class.
- Keys with zeros in bit positions 0-25, 41-71, 84-98, and
123-127 and any value in bit positions 26-40, 72-83, and
99-122. There are 2^51 weak keys in this class.
- Overrides:
- isWeak in class RawKeyGenerator
- Parameters:
key
- the byte array containing user key data.
Copyright (C) 1995-2000 The Cryptix Foundation Ltd. All rights reserved.