PHP MD5/base64 encryption to C# md5/base64 encryption

Question

I am in the process of try to integrate some C# ASP.NET webservice into my PHP application however there is a big problem. The way the C# webservice does the encryption is not compatible with the way PHP does the MD5 encryption. I have found solution for converting the C# MD5 to PHP MD5 however I can't change the C# code. Is there a way to change the way that PHP does its MD5 encryption to match C#? The c# encryption works like this:

MD5CryptoServiceProvider MD5 = new MD5CryptoServiceProvider();
byte[] bs = System.Text.Encoding.UTF8.GetBytes(stringToEncrypt);
String myString = Convert.ToBase64String(MD5.ComputeHash(bs));

Try sharing your PHP code also. And technically, MD5 is not encryption, but a one-way hash algorithm. — driis
– driis, Commented Dec 13, 2010 at 21:43
Neither MD5 nor Base64 are encryptions; MD5 is a cryptographic hash function and Base64 is a base conversion to represent binary data with 64 printable ASCII characters. — Gumbo
– Gumbo, Commented Dec 13, 2010 at 21:44
apparently I needed to do base64_encode(md5('123456789', true)) — ryanzec
– ryanzec, Commented Dec 14, 2010 at 13:04

Rex M · Accepted Answer · 2010-12-13 21:51:12Z

3

Since MD5 is a published algorithm, the implementations in PHP and c# are identical. The only difference is the string format of the byte sequence they produce. PHP produces a hex string, so you just need to convert from hex to Base64.

answered Dec 13, 2010 at 21:51

Rex M

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1 Comment

Jordan Over a year ago

base64_encode(md5('123456789', true)) will also work as noted by ryanzec - I saw no mention as to why exactly this works so I will briefly explain - the optional boolean value, which defaults to false, declares that you want a hexadecimal representation of the md5 hash as opposed to the raw binary representation

driis · Accepted Answer · 2010-12-13 21:45:56Z

0

This could be an encoding issue. Make sure your PHP version gets the UTF-8 representation of the string, apply MD5, then convert to a base 64 string, and you should be fine.

answered Dec 13, 2010 at 21:45

driis

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ryanzec Over a year ago

well I am doing base64_encode(md5(utf8_encode('123456789')))) but not getting the same as C#

Vincent · Accepted Answer · 2010-12-13 21:52:54Z

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This is an encoding issue I have had before between PHP and C#.

If PHP is manipulating ISO-8859-1 strings (which is probably your case), you can do:

md5(utf8_encode($stringToEncrypt))

The best way to test is to try a very simple string with a-z content, which should work fine regardless of any encoding issue. It that works and the whole thing doesn't, you have an encoding issue.

You could also do:

byte[] bs = System.Text.Encoding.GetEncoding("ISO-8859-1").GetBytes(stringToEncrypt);

and

md5($stringToEncrypt)

will work just fine.

answered Dec 13, 2010 at 21:52

Vincent

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Vincent · Accepted Answer · 2010-12-13 21:59:01Z

0

I see what is your problem:

String myString = Convert.ToBase64String(MD5.ComputeHash(bs));

will make a Base64 string out of a pure MD5 array hash.

PHP will first make an hex representation of the MD5 hash then base64-encode it.

You should get the hex result first as described here:

http://blog.stevex.net/c-code-snippet-creating-an-md5-hash-string/

and then base64 encode the string.

answered Dec 13, 2010 at 21:59

Vincent

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ryanzec Over a year ago

yea, I know that but like I said, I can't change the C#, only the PHP

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