Sebastian Andrzej Siewior <linux-cry...@ml.breakpoint.cc> wrote: > > The long story: > ARC4 is a stream cipher and not a block cipher. Its internal state is > reseted in setkey() and every crypto request (encrypt/decrypt don't > matter) update the internal state of the stream cipher. That's why you > get a different result every time you read the same block.
Actually I think that's a bug. These ciphers really should not modify their tfm state between operations. Requiring a setkey before each new operation precludes parallel processing. I noticed that salsa seems to be broken in the same way, but at least it should be easy to fix. arc4 on the other hand needs to be converted to a blkcipher. Cheers, -- Visit Openswan at http://www.openswan.org/ Email: Herbert Xu ~{PmV>HI~} <herb...@gondor.apana.org.au> Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt -- To unsubscribe from this list: send the line "unsubscribe linux-crypto" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
