cryptix.provider.key
Class IDEAKeyGenerator
- Cloneable, ExtendedKeyGenerator, Parameterized
public class IDEAKeyGenerator
A key generator for IDEA.
IDEA keys have a fixed length of 128 bits.
References:
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Copyright © 1997
Systemics Ltd on behalf of the
Cryptix Development Team.
All rights reserved.
$Revision: 1.1.1.1 $
boolean | isWeak(byte[] key) - Returns true iff the byte array key represents a
weak IDEA key.
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engineGenerateKey , generateKey , generateKey , getDefaultKeyLength , getMaximumKeyLength , getMinimumKeyLength , initialize , initialize , isValidKeyLength , isWeak , isWeakAllowed , setWeakAllowed |
clone , engineGetParameter , engineSetParameter , generateKey , getAlgorithm , getAlgorithms , getAlgorithms , getInstance , getInstance , getParameter , initialize , 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.
- isWeak in interface RawKeyGenerator
key
- the byte array containing user key data.