KeyGenerators for HMACMD5 and HMACSHA1 will accept a keylength of 0
without throwing an IllegalArgumentException. See the attached example
to reproduce.

% uname -a
Linux dickdale 2.6.5-7.108-default #1 Wed Aug 25 13:34:40 UTC 2004 i686 i686 i386 GNU/Linux
% env PATH=/java/re/jdk/1.5.0/promoted/latest/binaries/linux-i586/bin:$PATH java KGInit
trying KeyGenerator.init( int )
FAILED - KeyGenerator.init( 0 ) doesn't throw InvalidParameterException
trying KeyGenerator.init( int, SecureRandom )
FAILED - KeyGenerator.init( 0, new SecureRandom() ) doesn't throw InvalidParameterException
[Exit 1 ]
%

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