MD5 hash encrypt and decryption

Question

1.00/5 (1 vote)

See more:

Hi,
i am new in this encoding decoding stufs and i have some problem.
I work on VS 2012 ASP.NET c#.
My problem is that i need to create CheckSum value from some input string. The length of the CheckSum need to be 16 bytes (32 characters) long like this one: "8A303F3E0CB4F8A9CDA5AC120F9B90A4".
The encryption need to be done using a pass key for example TEST_PASS and this key will be used latter to be decrypted this hash value....
hope you understand what i ask and what i need pls help me

Posted 20-Feb-13 15:35pm

thekoko89

Add a Solution

Comments

Sergey Alexandrovich Kryukov 20-Feb-13 21:43pm

Who told you it encrypts or decrypts anything?!
—SA

thekoko89 20-Feb-13 21:54pm

i gess mabey they will not decrypt but will use the same TEST_PASS to compare those posted values...

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Sergey Alexandrovich Kryukov · Accepted Answer · 2013-02-20T15:43:00

Solution 1

No! MD5 is cryptography thing, but its not for encryption or decryption. This is a cryptographic hash function:
http://en.wikipedia.org/wiki/Cryptographic_hash_function[^].

And as such, it is not good; it's strongly recommended not to use it for any cryptographic purposes: it's broken. Please see: http://en.wikipedia.org/wiki/Md5[^].

That's it. But check sum can be used for non-cryptographic purposes, but just as a check. This is what you probably need. So, everything you need is provided in .NET FCL:
http://msdn.microsoft.com/en-us/library/system.security.cryptography.hashalgorithm.aspx[^].

—SA

Posted 20-Feb-13 15:43pm

Sergey Alexandrovich Kryukov

Comments

thekoko89 20-Feb-13 21:50pm

my merchant service ask me to do this and generate a checksum usind MD5 with TEST_PASS :S so i realy need some code to do this its the only way

Sergey Alexandrovich Kryukov 20-Feb-13 21:58pm

Who cares who asked you and why? I'm talking to you, not with "merchant service", because you asked us a question, not they. Don't you see that I answered?! What else is a problem? You have all you need.
If you can see it, please accept the answer formally (green button), if not — your follow-up questions are welcome.
—SA

thekoko89 20-Feb-13 22:03pm

gess we understand each other i was trying to explain what exactly is my problem.... there is no need for fight... tnx for understanding i am in a bug pressure at the mom

Sergey Alexandrovich Kryukov 6-Mar-13 18:16pm

Hope we do, I only don't understand what fight do you mean. I see no fight.
Good luck, call again.
—SA

thekoko89 6-Mar-13 18:23pm

Ok my mistake miss understanding...

Sergey Alexandrovich Kryukov 6-Mar-13 18:23pm

Great. Good luck.
—SA