class ActiveRecord::Encryption::KeyGenerator

The generated key will be salted with the value of +ActiveRecord::Encryption.key_derivation_salt+

by default)
Derives a key from the given password. The key will have a size in bytes of +:length+ (configured +Cipher+'s length

def derive_key_from(password, length: key_length)
  ActiveSupport::KeyGenerator.new(password).generate_key(ActiveRecord::Encryption.config.key_derivation_salt, length)
end

[ value ].pack("H*")

To convert back to the original string with the desired length:

plain text
good practice including not printable characters. Hexadecimal format ensures that generated keys are representable with
Hexadecimal format is handy for representing keys as printable text. To maximize the space of characters used, it is

length by default)
Returns a random key in hexadecimal format. The key will have a size in bytes of +:length+ (configured +Cipher+'s

def generate_random_hex_key(length: key_length)
  generate_random_key(length: length).unpack("H*")[0]
end

Returns a random key. The key will have a size in bytes of +:length+ (configured +Cipher+'s length by default)

def generate_random_key(length: key_length)
  SecureRandom.random_bytes(length)
end

def key_length
  @key_length ||= ActiveRecord::Encryption.cipher.key_length
end