CODEWITHSUNDEEP
c#rubyunicode
Abhroo
Abhroo

Reputation: 126

How to match output from MD5 hash of Unicode string in C#, in a Ruby application?

Here is code fragment of c#.

byte[] bytes = Encoding.Unicode.GetBytes('test');
byte[] numArray = new byte[0];
numArray = (byte[])null;
using (MD5 md5 = MD5.Create())
numArray = md5.ComputeHash(bytes);

OutPut:

bytes = [116, 0, 101, 0, 115, 0, 116, 0] 
numArray = [200, 5, 158, 46, 199, 65, 159, 89, 14, 121, 215, 241, 183, 116, 191, 230]

Above same thing trying to achieve using Ruby or Ruby on Rails but facing some issues -

ruby code

bytes = "test".bytes.to_a.join(",") + ","
bytes = bytes.gsub(",", "/0/").split("/")
numArray = Digest::MD5.digest(bytes)

OutPut:

bytes = ["116", "0", "101", "0", "115", "0", "116", "0"]

When I am trying to access Digest::MD5.digest it is accepting only string value if I convert it into string I could not get same the result as C# code provided.

Upvotes: 3

Views: 977

Answers (1)

Neil Slater
Neil Slater

Reputation: 27227

This works in Ruby 1.9.3 and higher:

require 'digest/md5'
Digest::MD5.digest( "test".encode( 'UTF-16LE' ) ).bytes.to_a
 => [200, 5, 158, 46, 199, 65, 159, 89, 14, 121, 215, 241, 183, 116, 191, 230]

Some explanation:

  • C# (and Microsoft code in general) defaults to UTF-16LE for Unicode strings
  • Your string-mangling with inserting commas and gsub will get you in trouble, use Ruby's String encoding methods.
  • Digest::MD5.digest will read input strings as if force-encoded to 'ASCII-8BIT' (i.e. it just reads the bytes in the string, as they are stored, ignoring the character semantics), and also returns data in that encoding.

Upvotes: 4

Related Questions