Question

plist_values['HashData'].join("").unpack('m')[0].each_byte do |b|
    hash_decoded << sprintf("%02X", b)
end

I need to translate it to other language. As I understood, it puts all contents of ‘HashData’ array into a string, then decodes it from Base64, But what’s next?
Can you write me a step-by step explanation what it does?
Thanks in Advance!

Answer 1

• join("") concatenates all the strings in the array (or what each element in the array returns when calling to_s).
• unpack('m') from the docs decodes the string (and it assumes it is base64 encoded).
• sprintf("%02X", b) from the docs returns the hexadecimal representation with upper case letters.
• hash_decoded << .. appends the hex representation to the string

The bottom line is that you get a string that represents the hexadecimal version (with upper case letters) of the joined strings in plist_values['HashData'].