Re: MD5 conversion problem
From: Peter Afonin (peter_at_gudzon.net)
Date: 08/27/04
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Date: Fri, 27 Aug 2004 15:47:10 -0700
Thank you, Joe!
Peter
"Joe Kaplan (MVP - ADSI)" <joseph.e.kaplan@removethis.accenture.com> wrote
in message news:eB8IzPFjEHA.2696@TK2MSFTNGP11.phx.gbl...
> 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
> > > > > >
> > > > > >
> > > > >
> > > > >
> > > >
> > > >
> > >
> > >
> >
> >
>
>
- Next message: Karl: "Re: Response is not available in this context - page blowing"
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- In reply to: Joe Kaplan \(MVP - ADSI\): "Re: MD5 conversion problem"
- Next in thread: José Joye: "Re: MD5 conversion problem"
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