Am Dienstag, 18. November 2014, 22:08:23 schrieb Herbert Xu: Hi Herbert, > On Sun, Nov 16, 2014 at 03:24:25AM +0100, Stephan Mueller wrote: > > The AF_ALG interface allows normal cipher (hash, encrypt, decrypt). > > However, it does not allow user space to obtain the following generic > > > > information about the currently active cipher: > > * block size of the cipher > > > > * IV size of the cipher > > > > * for AEAD, the maximum authentication tag size > > > > The patch adds a getsockopt interface for the symmetric ciphers to > > answer such information requests from user space. > > > > The kernel crypto API function calls are used to obtain the real data. > > As all data are simple integer values, the getsockopt handler function > > uses put_user() to return the integer value to user space in the > > *optval parameter of getsockopt. > > > > Signed-off-by: Stephan Mueller <smueller@xxxxxxxxxx> > > We already have crypto_user so you should be extending that to > cover what's missing. Looking into that, I think nothing is missing -- thanks for the pointer. Thus I think I can withdraw that patch and just simply update libkcapi to use that user space netlink interface. Though, I yet have to try using that interface ;-) I am wondering why cryptouser.h is in include/linux -- shouldn't it be in include/uapi/linux? Aren't the definitions in that header file needed for userspace to talk to the netlink socket? I guess that is also the reason why I do not see the interface API details in /usr/linux on my F21 system. > > PS These paramters should not vary depending on the implementation, > if they do then one of the implementations must be buggy. > > Cheers, -- Ciao Stephan -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
