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.
|
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.