Reputation: 12727
I was wondering if someone could help me to get this method converted to ruby, is this possible at all?
public static string getSHA512(string str){
UnicodeEncoding UE = new UnicodeEncoding();
byte[] HashValue = null;
byte[] MessageBytes = UE.GetBytes(str);
System.Security.Cryptography.SHA512Managed SHhash = new System.Security.Cryptography.SHA512Managed();
string strHex = "";
HashValue = SHhash.ComputeHash(MessageBytes);
foreach (byte b in HashValue){
strHex += string.Format("{0:x2}", b);
}
return strHex;
}
Thanks in advance
UPDATE:
I just would like to make it clear that unfortunately it's method is not just for SHA512 generation but a custom one. I believe that the Digest::SHA512.hexdigest would be just the SHHast instance, but if you carefully look for the method you can see that it differs a bit from a simple hash generation. Follows the result of both functions.
# in C#
getSHA512("hello") => "5165d592a6afe59f80d07436e35bd513b3055429916400a16c1adfa499c5a8ce03a370acdd4dc787d04350473bea71ea8345748578fc63ac91f8f95b6c140b93"
# in Ruby
Digest::SHA512.hexdigest("hello") || Digest::SHA2 => "9b71d224bd62f3785d96d46ad3ea3d73319bfbc2890caadae2dff72519673ca72323c3d99ba5c11d7c7acc6e14b8c5da0c4663475c2e5c3adef46f73bcdec043"
Upvotes: 0
Views: 348
Reputation: 369633
require 'digest/sha2'
class String
def sha512
Digest::SHA2.new(512).hexdigest(encode('UTF-16LE'))
end
end
'hello'.sha512 # => '5165d592a6afe59f80d07436e35bd…5748578fc63ac91f8f95b6c140b93'
As with all my code snippets on StackOverflow, I always assume the latest version of Ruby. Here's one that also works with Ruby 1.8:
require 'iconv'
require 'digest/sha2'
class String
def sha512(src_enc='UTF-8')
Digest::SHA2.new(512).hexdigest(Iconv.conv(src_enc, 'UTF-16LE', self))
end
end
'hello'.sha512 # => '5165d592a6afe59f80d07436e35bd…5748578fc63ac91f8f95b6c140b93'
Note that in this case, you have to know and tell Ruby about the encoding the string is in explicitly. In Ruby 1.9, Ruby always knows what encoding a string is in, and will convert it accordingly, when required. I chose UTF-8 as default encoding because it is backwards-compatible with ASCII, is the standard encoding on the internet and also otherwise widely used. However, for example both .NET and Java use UTF-16LE, not UTF-8. If your string is not UTF-8 or ASCII-encoded, you will have to pass in the encoding name into the sha512
method.
Off-Topic: 9 lines of code reduced to 1. I love Ruby!
Well, actually that is a little bit unfair. You could have written it something like this:
var messageBytes = new UnicodeEncoding().GetBytes(str);
var hashValue = new System.Security.Cryptography.SHA512Managed().
ComputeHash(messageBytes);
return hashValue.Aggregate<byte, string>("",
(s, b) => s += string.Format("{0:x2}", b)
);
Which is really only 3 lines (broken into 5 for StackOverflow's layout) and most importantly gets rid of that ugly 1950s-style explicit for
loop for a nice 1960s-style fold (aka. reduce
aka. inject
aka. Aggregate
aka. inject:into:
… it's all the same).
There's probably an even more elegant way to write this, but a) I don't actually know C# and .NET and b) this question is about Ruby. Focus, Jörg, focus! :-)
Aaand … found it:
return string.Join("", from b in hashValue select string.Format("{0:x2}", b));
I knew there had to be an equivalent to Ruby's Enumerable#join
somewhere, I just was looking in the wrong place.
Upvotes: 3