cryptix.provider.key
Class IDEAKeyGenerator
public
class
IDEAKeyGenerator
extends RawKeyGenerator
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 $
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.
|
public IDEAKeyGenerator()
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.
Parameters: key the byte array containing user key data.