Re: MD5 conversion problem
From: Joe Kaplan \(MVP - ADSI\) (joseph.e.kaplan_at_removethis.accenture.com)
Date: 08/27/04
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Date: Fri, 27 Aug 2004 11:36:04 -0500
Ah, this is the hex encoding thing I mentioned in my first post and didn't
provide an example for. You can either use the BitConverter class to
convert the byte[] to hex digits and then strip out the - characters it puts
in between or using something like my function called ConvertToOctetString
that you can do a Google groups search for that does this. It basically
just uses a StringBuilder and the X2 format code to loop over the bytes and
build the string.
Also, MAKE SURE that the vendor is calculating the MD5 of the data using the
same encoding that you are (UTF8, ACSII, UTF16, etc.) or else your input
byte array may be different and thus your hash will be different.
HTH,
Joe K.
"Peter Afonin" <pva@speakeasy.net> wrote in message
news:utMGDDAjEHA.2544@TK2MSFTNGP10.phx.gbl...
> Joe, I'm connecting an online store to the payment system. I need to pass
> this string to this payment gateway, and it will return me another string
> back, confirming that the payment was successful.
>
> I contacted the techsupport of this gateway. They said that I don't have
to
> convert my string to Base64. I need to convert every byte to 16-bit number
> or something like this. They don't use ASP.Net, so couldn't give me an
exact
> code. They said that it should look approximately like this:
>
> StringBuilder sb = new StringBuilder();
>
> for (int i=0;i<hash.Length;i++)
> sb.Append(hash[i].ToString("x").PadLeft(2,'0'));
>
> return sb.ToString();
>
> How it should look in VB.Net?
>
> Thank you,
>
> Peter
>
>
> "Joe Kaplan (MVP - ADSI)" <joseph.e.kaplan@removethis.accenture.com> wrote
> in message news:OJQ8p$%23iEHA.3988@tk2msftngp13.phx.gbl...
> > What is giving you a "bad CRC" error? Is it the code below? That looks
> > like it should just return a base64 encoded MD5 hash of whatever string
> was
> > provided.
> >
> > It isn't clear to me what you are trying to do or what the input is in
the
> > funtion.
> >
> > Joe K.
> >
> > "Peter Afonin" <pva@speakeasy.net> wrote in message
> > news:eQeJri%23iEHA.3612@TK2MSFTNGP12.phx.gbl...
> > > Thank you, Joe.
> > >
> > > I've tried to change it like this:
> > >
> > > Dim hashedBytes As Byte()
> > > Dim md5 As New MD5CryptoServiceProvider
> > > Dim encoder As new UTF8Encoding
> > > hashedBytes = md5.ComputeHash(encoder.GetBytes(sCRC))
> > > sCRC = Convert.ToBase64String(md5.ComputeHash(hashedBytes))
> > > Me.crc.Value = sCRC
> > >
> > > Yes, the output string has changed:
> > >
> > > '<input type=hidden name=crc value="35r0XmeFIOXs5evTQM0q+w==">'+
> > >
> > > But I'm still getting a "bad crc" error.
> > >
> > > Peter
> > >
> > > "Joe Kaplan (MVP - ADSI)" <joseph.e.kaplan@removethis.accenture.com>
> wrote
> > > in message news:uoBsCL%23iEHA.4024@TK2MSFTNGP09.phx.gbl...
> > > > Why don't you try Convert.ToBase64String instead? Typically, you
> encode
> > > > binary data as a string with either Base64 or hex string encoding.
> > > >
> > > > Also, be careful about using ASCII encoding to convert the input
> string
> > to
> > > > binary. If it includes any non-ASCII characters, you'll be throwing
> > data
> > > > away. UTF8 is safer. Whatever you do, make sure you alway compute
> the
> > > hash
> > > > the same way if you are going to be using it for a comparison.
> > > >
> > > > HTH,
> > > >
> > > > Joe K.
> > > >
> > > > "Peter Afonin" <pva@speakeasy.net> wrote in message
> > > > news:eJWO769iEHA.3928@TK2MSFTNGP11.phx.gbl...
> > > > > Hello,
> > > > >
> > > > > I'm struggling with the string conversion to MD5 which I've never
> user
> > > > > before.
> > > > >
> > > > > I have a string that I need to encode which looks approximately
like
> > > this:
> > > > >
> > > > >
> > >
> "pva:0.05:101214:pa7735tH:inv_desc=205308:shp_Email=petera_gudzon.net:lang
> > > > >
> > > >
> > >
> >
>
=ru:shp_PaymentNo=20040825205308:shp_UserID=pva:shp_Price=2.95:shp_HostPlan=
> > > > > BU:shp_Term=2"
> > > > >
> > > > > I'm doing it this way:
> > > > >
> > > > > Dim hashedBytes As Byte()
> > > > > Dim md5 As New MD5CryptoServiceProvider
> > > > > Dim encoder As New ASCIIEncoding
> > > > > hashedBytes = md5.ComputeHash(encoder.GetBytes(sCRC))
> > > > > Dim sNewCRC as String =
> Convert.ToString(md5.ComputeHash(hashedBytes))
> > > > >
> > > > > It doesn't work. When I see the output on the page where I pass
this
> > > > string,
> > > > > it looks like this:
> > > > >
> > > > > '<input type=hidden name=crc value="System.Byte[]">'+
> > > > >
> > > > > I don't know exactly how it should look like, but probably not
like
> > > > > "System.Byte[]"
> > > > >
> > > > > I'm doing something wrong, but I don't know what.
> > > > >
> > > > > I would really appreciate your help.
> > > > >
> > > > > Thank you,
> > > > >
> > > > > Peter Afonin
> > > > >
> > > > >
> > > >
> > > >
> > >
> > >
> >
> >
>
>
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