Convert a string to md5

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Hey all
I want to convert a string to md5 like this

1234567890123475e8dd316726b0335 = 8f 43 ae 1a 33 19 c6 49 cc 57 40 8b 6a 39 2d 6b

Thanks in advance
Please Help me

Posted 18-Jan-11 7:11am

Seif Hatem

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OriginalGriff 18-Jan-11 14:22pm

See Daves' answer re MD5 security: I would recommend SHA512 (also built into .NET) over MD5 for all new applications.

3 solutions

Solution 3

This is what i used and worked
try it

Dim md5 As MD5 = System.Security.Cryptography.MD5.Create()
Dim inputBytes As Byte() = System.Text.Encoding.ASCII.GetBytes("1234567890123475e8dd316726b0335")
Dim hash As Byte() = md5.ComputeHash(inputBytes)
Dim sb As New StringBuilder()
For i As Integer = 0 To hash.Length - 1
    sb.Append(hash(i).ToString("x2"))
Next
TextBox1.Text = sb.ToString

Hope i helped

Posted 18-Jan-11 7:36am

Seif Hatem

v2

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Nish Nishant · Accepted Answer · 2011-01-18T07:13:00

Solution 1

MSDN example:

http://msdn.microsoft.com/en-us/library/system.security.cryptography.md5.aspx[^]

Example from 3rd party blog:

http://warren5236.wordpress.com/2007/12/26/calculating-an-md5-hash-in-vbnet/[^]

Posted 18-Jan-11 7:13am

Nish Nishant

Comments

Sergey Alexandrovich Kryukov 18-Jan-11 13:55pm

Clear and to the point -- my 5. However, Inquirer should pay attention to a warning in the Answer by Dave; see also my comment.

Nish Nishant 18-Jan-11 13:59pm

Thanks.

Dave Kreskowiak · Accepted Answer · 2011-01-18T07:19:00

Solution 2

MD5 is known to be weak and easily cracked. You may want to reconsider using it if security of data is a real issue.

Posted 18-Jan-11 7:19am

Dave Kreskowiak

Comments

Sergey Alexandrovich Kryukov 18-Jan-11 13:53pm

Dave, you're absolutely right if you mean security or ciphering. In this case, I would advice RSA; I would advice to use strong names for all assemblies, etc.
But we don't know the purpose: this is merely some hash code; a check sums of this kind are often published with the downloads (not so secure, but this can be a requirement), or whatever else.

OriginalGriff 18-Jan-11 14:19pm

RSA isn't really suitable as a replacement for MD5: the latter is a hashing algorithm (i.e. one way, you can't regenerate the input from the output) while RSA is a public key encryption system.
If you are storing login passwords for example, RSA is decidedly not suitable.
MD5 is indeed classed as "broken" and I have been recommending SHA512 ever since the announcement (SHA1024 is due in 2012 and should be considerably better). SHA is a hashing algorithm and as such is more suitable for MD5 type applications than a reversible encryption technique.
Unfortunately, I can't give you a five, because your comment did deserve it!

Sergey Alexandrovich Kryukov 18-Jan-11 15:39pm

Griff, thanks for your note. My main point was exactly this: I say, may be MD5 is good enough for the purpose which we don't know exactly. About RSA the purpose was to mention it's important for security, so I would recommend it where appropriate.
Thank you for your assessment of SHA as opposed to MD5: I did not have clear idea on their comparison.

Dave Kreskowiak 18-Jan-11 19:11pm

Your correct. I have no idea what he's using this for. But, an educated guess would be for passwords since he's asking about encrypting a string and his example is for a relatively short string. I could very well be wrong too. But, in either case, something that's worth hashing is worth more than a broken hash, no matter what it is. I'd user SHA512 in it's place, for now...

OriginalGriff 18-Jan-11 14:21pm

Good advice, I have been recommending SHA512 for a year or so now. +5