Thanks Arno! But it seems not the reason that causes the problem. I looked at the output of "cat /proc/crypto", it shows these: name : sha1 module : kernel type : digest blocksize : 64 digestsize : 20 name : md5 module : md5 type : digest blocksize : 64 digestsize : 16 name : crc32c module : crc32c type : digest blocksize : 32 digestsize : 4 name : aes module : aes type : cipher blocksize : 16 min keysize : 16 max keysize : 32 I have tried sha1, it reports the same error. I think the modules needed have been loaded. So, what is the reason that causes the error? Besides, I am using CentOS 4.6 and am trying to setup an encrypted logical volume on an existing normal logical volume. Here are some information about my system: # uname -a Linux xxx.xxx.com 2.6.9-67.ELsmp #1 SMP Fri Nov 16 12:49:06 EST 2007 x86_64 x86_64 x86_64 GNU/Linux Any other information may help? Mersenne Yang On Tue, Nov 11, 2008 at 04:40:30PM +0800, ?????? wrote: > Hi, all, > > When I tried to create an encrypt volume, I encounter an error as follows: > > # ./cryptsetup create --cipher=aes --hash=md5 aaa /dev/myvg/lvol0 > Enter passphrase: > Command failed: Key processing error: No hash backend found I suspect that means missing md5 support in the kernel. Have a look at the output of "cat /proc/crypto" (may be long, you may want to pipe it into less or a file). The md5 entry looks something like this: name : md5 driver : md5-generic module : kernel priority : 0 refcnt : 1 type : digest blocksize : 64 digestsize : 16 > And if I try this: > # ./cryptsetup create --cipher=aes --hash=plain aaa /dev/myvg/lvol0 > > It works but alert another error. > sh: /sbin/udevsettle: No such file or directory This seems to indicate a problem with /dev/myvg/lvol0, which is probably generated by udev. Maybe the udev installation is broken or the version is too new/old? Sorry, I do not really understand udev at this time. > Did I have missed any lib file or wrongly configured any thing? If this is a monolitic kernel you may have to compile md5 support into the kernel. If it is a module kernel, you may just have to load the md5 module (if present). Arno -- Arno Wagner, Dr. sc. techn., Dipl. Inform., CISSP -- Email: arno@xxxxxxxxxxx GnuPG: ID: 1E25338F FP: 0C30 5782 9D93 F785 E79C 0296 797F 6B50 1E25 338F ---- Cuddly UI's are the manifestation of wishful thinking. -- Dylan Evans If it's in the news, don't worry about it. The very definition of "news" is "something that hardly ever happens." -- Bruce Schneier --------------------------------------------------------------------- dm-crypt mailing list - http://www.saout.de/misc/dm-crypt/ To unsubscribe, e-mail: dm-crypt-unsubscribe@xxxxxxxx For additional commands, e-mail: dm-crypt-help@xxxxxxxx Powered by MessageSoft SMG SPAM, virus-free and secure email Powered by MessageSoft SMG SPAM, virus-free and secure email --------------------------------------------------------------------- dm-crypt mailing list - http://www.saout.de/misc/dm-crypt/ To unsubscribe, e-mail: dm-crypt-unsubscribe@xxxxxxxx For additional commands, e-mail: dm-crypt-help@xxxxxxxx
