On Wed, Jun 03, 2015 at 03:02:13PM -0500, Jay Monkman wrote: > > That would be one use, but a more likely use would be to prevent > access to the keys. A system could write keys to the key slots in > the bootloader or in a TrustZone secure world. Then those keys could > be used for crypto operations in Linux without ever exposing them. > Key slots can be written to, but cannot be read from. > > Even with keys stored in key slots, other keys may be used. For > example, someone could do: > operation w/ key in slot 1 > operation w/ key provided in descriptor > operation w/ key in slot 1 > > I don't think an LRU scheme would allow something like that.
In that case I would suggest using setkey with a length other than that of a valid AES key. For example, you could use a one- byte value to select the key slot. Cheers, -- Email: Herbert Xu <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
