What one-way hash function to use?

Jonas Elfström — Tue, 27 Feb 2007 17:01:00 +0100

One-way hash functions takes a message of any length as input and outputs a very large but fixed length number, called message digest or fingerprint. They can be used for "storing" passwords or as a signature that makes it possible to verify that you got the correct message.

MD5 got into problems over 10 years ago and SHA-1 could to be heading the same way. Until the new standard is published I would follow the crowd and recommend SHA-256.

Ruby

require 'digest/sha2'
quickfox="The quick brown fox jumps over the lazy dog"
Digest::SHA256.hexdigest(quickfox)

=> "d7a8fbb307d7809469ca9abcb0082e4f8d5651e46d3cdb762d02d0bf37c9e592"

C#

using System.Security.Cryptography;

...

 ASCIIEncoding byteConverter = new ASCIIEncoding();
 string quickfox="The quick brown fox jumps over the lazy dog";
 HashAlgorithm sha256 = new SHA256Managed();
 byte[] hash = sha256.ComputeHash(byteConverter.GetBytes(quickfox));
 crypt.Text = Convert.ToBase64String(hash);

Alice, Bob, and Mallory: What one-way hash function to use?

What one-way hash function to use?

Ruby

C#