ArgumentError (key must be 32 bytes or longer) in Rails 6

[arvindmehra]

I was using attr_encrypted (1.3.3) in rails 4.1 in User model with following details

attr_encrypted :email, :key => 'some_key'

After upgrading the application to rails 6 attr_encrypted bumped to attr_encrypted (3.1.0) which uses encryptor (~> 3.0.0)

in the encryptor (~> 3.0.0) new validation has been introduced

raise ArgumentError.new("key must be #{cipher.key_len} bytes or longer") if options[:key].bytesize < cipher.key_len

which raises ArgumentError (key must be 32 bytes or longer) exception

How can I keep using the existing :key => 'some_key' in attr_encrypted (3.1.0) version

[valinaga]

How about use this:

 :key => 'some_key'.bytes[0..31].pack( "c" * 32 )

[peterbajwa]

It's raising below error

ArgumentError (too few arguments)

[n-at-han-k]

How about use this:

 :key => 'some_key'.bytes[0..31].pack( "c" * 32 )

Works for me on rails 7.1

I changed:

attr_encrypted :email, key: Rails.application.credentials.secret_key_base

to the following:

attr_encrypted :email, key: Rails.application.credentials.secret_key_base.bytes[0..31].pack( "c" * 32 )