Generating a HMAC_SHA1 signature

Please forgive me I have just started using google checkout.
 I am
trying to integrate Google Checkout with API and I am having
some
difficulty getting the signature to generate using HMACSHA1
and return
it in Binary.  This is the simple code I am using I was
wondering if
anyone could help.  It is in ASP.NET/VB.

I keep getting the error "Bad Signature on Cart"

When I look at the xml Google received, it is my xml cart
exactly that
has been encoded in base 64, so I know the base 64 function
is good.

'****Convert the Byte array to Binary value
    Private Function ByteArrayToBinary(ByVal byteArray As
Byte()) As
String
        Dim result As String
        result = ""
        For Each b As Byte In byteArray
            result &= Convert.ToString(b, 2)
        Next
        Return result
    End Function

'****Encode the str to Base 64
    Private Function Encode(ByVal str As String) As String
        Dim encbuff =
System.Text.Encoding.UTF8.GetBytes(str)
        Return Convert.ToBase64String(encbuff)
    End Function

xmlFile = "Shopping cart in xml format"


Dim SHA = New
System.Security.Cryptography.HMACSHA1(Encoding.UTF8.GetBytes
("[sandbox
vendor key]"))
Dim hashByte =
SHA.ComputeHash(Encoding.UTF8.GetBytes(xmlFile))

Dim Signature = Encode(ByteArrayToBinary(hashByte))

Thank you.


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Hi Chuck,

Are you using the .NET sample code we provided? If not, you
can find
it here: http://code.google.com/p/google-checkout-dotnet-samp
le-code/


Thanks,
Jacob

On May 25, 11:28 am, Chuck <c...autotrucktoys.com>
wrote:
> Please forgive me I have just started using google
checkout.  I am
> trying to integrate Google Checkout with API and I am
having some
> difficulty getting the signature to generate using
HMACSHA1 and return
> it in Binary.  This is the simple code I am using I was
wondering if
> anyone could help.  It is in ASP.NET/VB.
>
> I keep getting the error "Bad Signature on
Cart"
>
> When I look at the xml Google received, it is my xml
cart exactly that
> has been encoded in base 64, so I know the base 64
function is good.
>
> '****Convert the Byte array to Binary value
>     Private Function ByteArrayToBinary(ByVal byteArray
As Byte()) As
> String
>         Dim result As String
>         result = ""
>         For Each b As Byte In byteArray
>             result &= Convert.ToString(b, 2)
>         Next
>         Return result
>     End Function
>
> '****Encode the str to Base 64
>     Private Function Encode(ByVal str As String) As
String
>         Dim encbuff =
System.Text.Encoding.UTF8.GetBytes(str)
>         Return Convert.ToBase64String(encbuff)
>     End Function
>
> xmlFile = "Shopping cart in xml format"
>
> Dim SHA = New
>
System.Security.Cryptography.HMACSHA1(Encoding.UTF8.GetBytes
("[sandbox
> vendor key]"))
> Dim hashByte =
SHA.ComputeHash(Encoding.UTF8.GetBytes(xmlFile))
>
> Dim Signature = Encode(ByteArrayToBinary(hashByte))
>
> Thank you.


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The .NET sample code implements the alternate method of
posting carts
to Google Checkout, so no HMAC_SHA1 signature is generated.

If you've tried out our sample code, is there a particular
reason why
you aren't utilizing it?


Thanks,
Jacob

On May 30, 8:18 pm, GoogleCheckoutDevPro
<checkout-dev-...google.com>
wrote:
> Hi Chuck,
>
> Are you using the .NET sample code we provided? If not,
you can find
> it here:http://code.google.com/p/google-checkout-dotnet-samp
le-code/
>
> Thanks,
> Jacob
>
> On May 25, 11:28 am, Chuck <c...autotrucktoys.com> wrote:
>
> > Please forgive me I have just started using google
checkout.  I am
> > trying to integrate Google Checkout with API and I
am having some
> > difficulty getting the signature to generate using
HMACSHA1 and return
> > it in Binary.  This is the simple code I am using
I was wondering if
> > anyone could help.  It is in ASP.NET/VB.
>
> > I keep getting the error "Bad Signature on
Cart"
>
> > When I look at the xml Google received, it is my
xml cart exactly that
> > has been encoded in base 64, so I know the base 64
function is good.
>
> > '****Convert the Byte array to Binary value
> >     Private Function ByteArrayToBinary(ByVal
byteArray As Byte()) As
> > String
> >         Dim result As String
> >         result = ""
> >         For Each b As Byte In byteArray
> >             result &= Convert.ToString(b, 2)
> >         Next
> >         Return result
> >     End Function
>
> > '****Encode the str to Base 64
> >     Private Function Encode(ByVal str As String)
As String
> >         Dim encbuff =
System.Text.Encoding.UTF8.GetBytes(str)
> >         Return Convert.ToBase64String(encbuff)
> >     End Function
>
> > xmlFile = "Shopping cart in xml format"
>
> > Dim SHA = New
> >
System.Security.Cryptography.HMACSHA1(Encoding.UTF8.GetBytes
("[sandbox
> > vendor key]"))
> > Dim hashByte =
SHA.ComputeHash(Encoding.UTF8.GetBytes(xmlFile))
>
> > Dim Signature =
Encode(ByteArrayToBinary(hashByte))
>
> > Thank you.


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I am not using the sample code because it is written in C
not VB and
we use VB here.  I have looked at the code and ripped what I
can from
it.  I have gotten the posting the cart working to Google,
now I am
having troubles with the merchant calculations.

I was under the assumption I would need to reply to Google,
when they
access my XML Service, in XML but it doesn't look that way. 
It looks
like what I need to do is just return a string in the psuedo
XML
format you request.  Is this a correct statement?

Also for everyone that is using VB.net in their ASP.NET and
they are
having problems posting their carts here is the code I used
that
works.

        '******This creates the HMACSHA1 object and seeds it
with your
merchant key so it will gen the signature with your
specific
key*******'

        Dim SHA = New
System.Security.Cryptography.HMACSHA1(Encoding.UTF8.GetBytes
("[Merchant
Key]"))

        '******This takes the xmlFile string which is the
xml cart
Google requests and creates a signature based on it******'
        Dim hashByte =
SHA.ComputeHash(Encoding.UTF8.GetBytes(xmlFile))

        '******This base 64 encodes the signature you will
send to
Google in the signature form field******'
        Dim base64Signature =
Convert.ToBase64String(hashByte)

        '******This assigns the hidden form field
"signature" in the
html below the base64 encoded signature******'
        signature.Value = base64Signature

        '******This base64 encodes the xmlFile and assigns
it to the
hidden form field "cart" in the html below******'
        cart.Value =
Convert.ToBase64String(Encoding.UTF8.GetBytes(xmlFile))

        .
        .
        .

<!--These two form fields are what are submitted to
Google in the
google form using the google checkout button-->
         <asp:HiddenField
        ID="cart"
         Value="Nothing"
         runat="server"
       />
       <asp:HiddenField
        ID="signature"
        value="Nothing"
        runat="server"
       />


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