從Ruby中的字符串獲取UTF-8字節

Question

我有一個要求「對字符串的UTF-8字節執行SHA1哈希」。我不確定如何獲取UTF-8字節。這裏是什麼，我應該得到一個例子：

original = "http://www.provider.com/article?query=mysearch&abcd&1300459467&our secret key" 
#Perform the sha1 hashing on the UTF-8 bytes of this string, to get ... 
expected_hashed = "99802fec87b6ef1d45bd07f3053d13 6cfcfbdf0b" 
#... which is a 160 byte fingerprint. 
#You need to then take the 20 byte representation of this string (make sure you're 
#not just taking the hex string), and base 64 encode that. 
expected_encoded = "mYAv7Ie27x1FvQfzBT0TbPz73ws=" 

它從original到expected_hashed多數民衆贊成讓我有問題越來越：我不知道如何讓UTF-8字節出來。我正在做SHA1散列，如Digest::SHA1.digest(unhashed_string)，我也不是100％確定在這種情況下也是合適的。 ：/我也不確定「這個字符串的20字節表示」是什麼。

Answer 1

require 'digest' 
require 'base64' 
Base64.encode64(Digest::SHA1.digest(original)[0,20]) 
# => "mYAv7Ie27x1FvQfzBT0TbPz73ws=\n"