iotests: Use aes-128-cbc

Our gnutls crypto backend (which is the default as of 8bd0931f6)
supports neither twofish-128 nor the CTR mode.  CBC and aes-128 are
supported by all of our backends (as far as I can tell), so use
aes-128-cbc in our iotests.

(We could also use e.g. aes-256-cbc, but the different key sizes would
lead to different key slot offsets and so change the reference output
more, which is why I went with aes-128.)

Signed-off-by: Hanna Reitz <hreitz@redhat.com>
Message-Id: <20211117151707.52549-2-hreitz@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Tested-by: Thomas Huth <thuth@redhat.com>

tests/qemu-iotests/206

@@ -162,8 +162,8 @@ with iotests.FilePath('t.qcow2') as disk_path, \
                          'encrypt': {
                              'format': 'luks',
                              'key-secret': 'keysec0',
-                             'cipher-alg': 'twofish-128',
-                             'cipher-mode': 'ctr',
+                             'cipher-alg': 'aes-128',
+                             'cipher-mode': 'cbc',
                              'ivgen-alg': 'plain64',
                              'ivgen-hash-alg': 'md5',
                              'hash-alg': 'sha1',

tests/qemu-iotests/206.out

@@ -97,7 +97,7 @@ Format specific information:
 
 === Successful image creation (encrypted) ===
 
-{"execute": "blockdev-create", "arguments": {"job-id": "job0", "options": {"driver": "qcow2", "encrypt": {"cipher-alg": "twofish-128", "cipher-mode": "ctr", "format": "luks", "hash-alg": "sha1", "iter-time": 10, "ivgen-alg": "plain64", "ivgen-hash-alg": "md5", "key-secret": "keysec0"}, "file": {"driver": "file", "filename": "TEST_DIR/PID-t.qcow2"}, "size": 33554432}}}
+{"execute": "blockdev-create", "arguments": {"job-id": "job0", "options": {"driver": "qcow2", "encrypt": {"cipher-alg": "aes-128", "cipher-mode": "cbc", "format": "luks", "hash-alg": "sha1", "iter-time": 10, "ivgen-alg": "plain64", "ivgen-hash-alg": "md5", "key-secret": "keysec0"}, "file": {"driver": "file", "filename": "TEST_DIR/PID-t.qcow2"}, "size": 33554432}}}
 {"return": {}}
 {"execute": "job-dismiss", "arguments": {"id": "job0"}}
 {"return": {}}
@@ -115,10 +115,10 @@ Format specific information:
     encrypt:
         ivgen alg: plain64
         hash alg: sha1
-        cipher alg: twofish-128
+        cipher alg: aes-128
         uuid: XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX
         format: luks
-        cipher mode: ctr
+        cipher mode: cbc
         slots:
             [0]:
                 active: true

tests/qemu-iotests/210

@@ -83,8 +83,8 @@ with iotests.FilePath('t.luks') as disk_path, \
                          },
                          'size': size,
                          'key-secret': 'keysec0',
-                         'cipher-alg': 'twofish-128',
-                         'cipher-mode': 'ctr',
+                         'cipher-alg': 'aes-128',
+                         'cipher-mode': 'cbc',
                          'ivgen-alg': 'plain64',
                          'ivgen-hash-alg': 'md5',
                          'hash-alg': 'sha1',

tests/qemu-iotests/210.out

@@ -59,7 +59,7 @@ Format specific information:
 {"execute": "job-dismiss", "arguments": {"id": "job0"}}
 {"return": {}}
 
-{"execute": "blockdev-create", "arguments": {"job-id": "job0", "options": {"cipher-alg": "twofish-128", "cipher-mode": "ctr", "driver": "luks", "file": {"driver": "file", "filename": "TEST_DIR/PID-t.luks"}, "hash-alg": "sha1", "iter-time": 10, "ivgen-alg": "plain64", "ivgen-hash-alg": "md5", "key-secret": "keysec0", "size": 67108864}}}
+{"execute": "blockdev-create", "arguments": {"job-id": "job0", "options": {"cipher-alg": "aes-128", "cipher-mode": "cbc", "driver": "luks", "file": {"driver": "file", "filename": "TEST_DIR/PID-t.luks"}, "hash-alg": "sha1", "iter-time": 10, "ivgen-alg": "plain64", "ivgen-hash-alg": "md5", "key-secret": "keysec0", "size": 67108864}}}
 {"return": {}}
 {"execute": "job-dismiss", "arguments": {"id": "job0"}}
 {"return": {}}
@@ -71,9 +71,9 @@ encrypted: yes
 Format specific information:
     ivgen alg: plain64
     hash alg: sha1
-    cipher alg: twofish-128
+    cipher alg: aes-128
     uuid: XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX
-    cipher mode: ctr
+    cipher mode: cbc
     slots:
         [0]:
             active: true