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James Morris wrote: On Tue, 19 Oct 2004, Oleg Makarenko wrote: >>Is there any better way to use crypto api for arc4 or similar ciphers? >>Cipher block size is not always a natural choice for the crypto_yield(). >>Especially for fast ciphers (arc4) and small "block" sizes (arc4 again). >> >> > >ARC4 is a bit strange because it's a stream cipher. I guess we could add >another encryption mode 'stream' which is optimized for one byte at a time >operation. > > >- James > > That would probably require one more parameter to cin_encrypt/cia_decrypt, something like "nblocks" which currently is always 1 and one more struct crypto_alg field that would help upper level to decide how many blocks it can safely encrypt/decrypt() at a time before crypto_yield(). This value depends on algorithm speed and should be chosen to make overhead smaller. It could be > 1 even for fast block ciphers and should be > 1 for stream ciphers. =oleg - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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