To give a little more context. The same code was working fine on PPC2000,
2002 and 2003 versions but stopped working with Windows Mobile 5.
Relevant sections of the code are below.
Private Const CryptDll As String = "coredll.dll"
<DllImport(CryptDll)> _
Public Shared Function CryptAcquireContext( _
ByRef phProv As IntPtr, ByVal pszContainer As String, _
ByVal pszProvider As String, ByVal dwProvType As Integer, _
ByVal dwFlags As Integer) As Boolean
End Function
If Not WinApi.CryptAcquireContext(hProv, Nothing, WinApi.MS_DEF_PROV,
WinApi.PROV_RSA_FULL, WinApi.CRYPT_VERIFYCONTEXT) Then
Failed("CryptAcquireContext")
End If
Thanks for any help or insight someone can provide
DPC
"dpcbabu" wrote:
> This happens to me on Windows Mobile 5.0. Any body have a solution.
>
> I am using the sample that was provided at:
>
> http://msdn.microsoft.com/library/de...gnatureApp.asp
>
> my guess is the dll being used has changed or the service is available only
> for signed applications. Can any one confirm or deny this?
>
> Thanks much,
> DPC
>
> "Sergey Bogdanov" wrote:
>
> > Is it Pocket PC 2002 or Pocket PC 2003?
> >
> >
> > --
> > Sergey Bogdanov [.NET CF MVP, MCSD]
> > http://www.sergeybogdanov.com
> >
> >
> > Amit wrote:
> > > well, I am using the cryptoapi to encrypt the data before sending it using
> > > GPRS to backoffice in my Pocket PC application. And sometimes it throws an
> > > Exception and Application crashes.
> > > System Exception CryptAcquireContext Failed.
> > > last error: 0x80000005
> > > Error Message: N/A.
> > >
> > > I am using the following code to encrypt the data.
> > >
> > > static public byte[] Encrypt(string passphrase, byte[] data, int offset,
> > > int count)
> > > {
> > > // holds encrypted data
> > > byte[] buffer = null;
> > >
> > > // crypto handles
> > > IntPtr hProv = IntPtr.Zero;
> > > IntPtr hKey = IntPtr.Zero;
> > >
> > > try
> > > {
> > > // get crypto provider, specify the provider (3rd argument)
> > > // instead of using default to ensure the same provider is
> > > // used on client and server
> > > if (!WinApi.CryptAcquireContext(ref hProv, null, WinApi.MS_DEF_PROV,
> > > WinApi.PROV_RSA_FULL, WinApi.CRYPT_VERIFYCONTEXT))
> > > Failed("CryptAcquireContext");
> > >
> > > // generate encryption key from passphrase
> > > hKey = GetCryptoKey(hProv, passphrase);
> > >
> > > // determine how large of a buffer is required
> > > // to hold the encrypted data
> > > uint dataLength = (uint)count;
> > > uint bufLength = (uint)count;
> > > if (!WinApi.CryptEncrypt(hKey, IntPtr.Zero, true,
> > > 0, null, ref dataLength, bufLength))
> > > Failed("CryptEncrypt");
> > >
> > > // allocate and fill buffer with encrypted data
> > > buffer = new byte[dataLength];
> > > Buffer.BlockCopy(data, offset, buffer, 0, count);
> > >
> > > dataLength = (uint)count;
> > > bufLength = (uint)buffer.Length;
> > > if (!WinApi.CryptEncrypt(hKey, IntPtr.Zero, true,
> > > 0, buffer, ref dataLength, bufLength))
> > > Failed("CryptEncrypt");
> > > }
> > >
> > > finally
> > > {
> > > // release crypto handles
> > > if (hKey != IntPtr.Zero)
> > > WinApi.CryptDestroyKey(hKey);
> > >
> > > if (hProv != IntPtr.Zero)
> > > WinApi.CryptReleaseContext(hProv, 0);
> > > }
> > >
> > > return buffer;
> > > }
> > >
> >
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