Comment 0 for bug 1415887

When using a string with a length != 16, 24, or 32 as value for the auth_encryption_key parameter in the /etc/heat/heat.conf file it is not possible to create new stacks. Creating a new stack (and probably anything else) will fail with the following exception:

ValueError: AES key must be either 16, 24, or 32 bytes long

Changing the auth_encryption_key parameter to a string with a length of 16, 24, or 32 solves the issue.

There should be at least a note in the parameter description that it is necessary to use a string with this specific length. A validation of the string value would be nice.