I am in learning mode and have been looking into CTR. Based on the fact that CTR does not require the plaintext to be a multiple of the blocksize nor is padding required, should I use cipher.c routines (as xcbc does) instead of blkcipher.c routines (as cbc does)? (I've been referencing rfc 3686.) If it is possible to receive plaintext < blocksize in CTR... then, wouldn't blkcipher_walk_virt() result in error because walk->total < blocksize. (Error would occur in blcipher_walk_next.) Regards, Joy - 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