On Thursday, May 28, 2015 at 06:01:56 PM, Jay Monkman wrote: > Marek, Hi, note that this discussion should really happen on the linux-crypto ML. Moving the discussion to ML. > I have a question about the proper way to implement a feature. The DCP > has the ability to read a key for encryption/decryption from on chip > fuses. The current driver doesn't support this and as far as I can tell, > there's no clean way to do that within the Linux crypto API. > > Do you have any suggestions on how to handle that? > > My best idea so far is to modify the driver so that if setkey is passed > a key with a length of 1 byte, the driver uses the on chip key. I'm not > sure if that would make it into the official kernel. What about defining CRYPTO_TFM_REQ_CPU_KEY and then notifying the MXS DCP code to pick the key from CPU by doing something like this in your code: crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_REQ_CPU_KEY); I _think_ this might be the way to go. Do a git grep on CRYPTO_TFM_REQ to get some usecases on the TFM flags. Best regards, Marek Vasut -- To unsubscribe from this list: send the line "unsubscribe linux-crypto" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
