SHA1 reversed bytes?
tonyg at lshift.net
Fri Mar 11 09:53:44 UTC 2005
Ned Konz wrote:
> Well, there you go... So use SecureHashAlgorithm instead. On my little-endian
> machine, BTW, this is what happens:
Yep, SecureHashAlgorithm is the way to go. Thanks.
For the record, these two expressions are equivalent:
(SHA1 new hashMessage: 'hi') reversed
(SecureHashAlgorithm new hashMessage: 'hi') asByteArray
- SHA1 returns a ByteArray
- SecureHashAlgorithm returns a LargePositiveInteger (which means
you have to be careful when converting to hex, if that's required)
- SHA1 returns bytes in the reverse order from openssl, java, c# etc
- SecureHashAlgorithm returns bytes in the same order as openssl, java,
Consequently I'll retire SHA1 in favour of SecureHashAlgorithm -
although of course some care will have to be taken regarding
left-zero-padding during the conversion from LargePositiveInteger to hex!
 Tony Garnock-Jones | Mob: +44 (0)7905 974 211
 LShift Ltd | Tel: +44 (0)20 7729 7060
  www.lshift.net | Email: tonyg at lshift.net
More information about the Squeak-dev