rabbitmqctl hash_password only supports the default hashing algorithm

[michaelklishin]

Is your feature request related to a problem? Please describe.

rabbitmqctl hash_password

was introduced as an easy way to produce a salted password hash without using HTTP API client library helpers.

It delegates to rabbit_password, a module shared with the server. However, the rabbit application key, that picks the hashing algorithm module, won't be set for CLI tools, which means that only the default function can be used with the aforementioned command.

Describe the solution you'd like

Add an option, e.g. --hashing-algorithm, that would be mapped to a hashing module.

For example,

• SHA-256, sha256 => rabbit_password_hashing_sha256
• SHA-512, sha512 => rabbit_password_hashing_sha512
• All other values => either use the default (rabbit_password_hashing_sha256)

Describe alternatives you've considered

No response

Additional context

rabbitmqadmin v2 should arguably provide an equivalent command rabbitmq/rabbitmqadmin-ng#73.