Bug 1369043

Summary: when create a luks format image with cipher alg=twofish and size=192, ambiguous error message produced.
Product: Red Hat Enterprise Linux 7 Reporter: yisun
Component: qemu-kvm-rhevAssignee: Daniel Berrangé <berrange>
Status: CLOSED CURRENTRELEASE QA Contact: Ping Li <pingl>
Severity: low Docs Contact:
Priority: unspecified    
Version: 7.4CC: aliang, chayang, coli, hachen, juzhang, knoel, meyang, michen, ngu, pingl, virt-maint, xfu, xuwei
Target Milestone: rc   
Target Release: ---   
Hardware: x86_64   
OS: Linux   
Whiteboard:
Fixed In Version: qemu-kvm-rhev-2.6.0-24.el7 Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2017-05-17 12:12:24 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:

Description yisun 2016-08-22 11:31:48 UTC 
Description of problem:
when create a luks format image with cipher alg=twofish and size=192, ambiguous error message produced. 

Version-Release number of selected component (if applicable):
qemu-kvm-rhev-2.6.0-21.el7.x86_64

How reproducible:
100%

Steps to Reproduce:
qemu-img create -f luks --object secret,id=sec0,data=`printf %s "redhat" | base64`,format=base64 -o key-secret=sec0,cipher-alg=twofish-192,cipher-mode=ecb,hash-alg=sha1,ivgen-alg=plain,ivgen-hash-alg=md5 1.img 1G

Formatting '1.img', fmt=luks size=1073741824 key-secret=sec0 cipher-alg=twofish-192 cipher-mode=ecb ivgen-alg=plain ivgen-hash-alg=md5 hash-alg=sha1
qemu-img: 1.img: Unsupported cipher algorithm 9


Actual results:
error msg is "Unsupported cipher algorithm 9" which is not clear. 

Expected results:
is twofish-192 not supported? what is algorithm 9
Comment 2 Daniel Berrangé 2016-09-05 16:44:21 UTC 
FWIW, we only get this error because we're mistakenly linking to gcrypt instead of nettle. I've already posted patches to fix QEMU to use nettle in RHEL-7.3 which will avoid this particular error. None the less we can improve the error message upstream
Comment 3 Daniel Berrangé 2017-05-17 12:12:24 UTC 
This issue was actually fixed in qemu-kvm-rhev-2.6.0-24.el7, shipped in 7.3 by this patch which switched us over to use nettle instead of gcrypt, thus avoiding the error scenario:

  kvm-redhat-switch-from-gcrypt-to-nettle-for-crypto.patch [bz#1301019]