Herbert Xu wrote: > On Fri, Jun 08, 2007 at 12:13:17PM -0700, Marc St-Jean wrote: > > > > In CBC mode we had a line of code copying cipher_desc.info to get the > > initialization vector. Such as: > > /* Copy in IV */ > > memcpy((u8*)(sa->crypt_iv), desc->info, > > crypto_tfm_alg_ivsize(tfm)); > > > > Now the only reference to the function I can find is in an IPsec comment > > from include/net/esp.h. Any tips on getting the size? > > We now have two types of ciphers, simple ciphers and block ciphers. The > former only ever ecnrypts one block at a time, and therefore needs no IV. > Only block ciphers have IVs. > > The other change is that instead of having everything as crypto_tfm they > all have their own types now. So ciphers are crypto_cipher while block > ciphers are crypto_blkcipher. > > In your case your tfm should be of type crypto_blkcipher. Then you simply > call crypto_blkcipher_ivsize(tfm) to get the size. > > > Thanks, I have been looking at that code but unfortunately it supports > > fewer cryptos/hashes so does not answer all my questions. > > The same concept still applies regardless of the actual number of modes. > > Oh and yes you do register it multiple times, once for each combination > of the blocking mode and the cipher. Thanks for the info Herbert. Marc - 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
