Error using CryptCreateHash

[Perro Flaco]

Hi everybody!

I've got a problem with the following piece of code:

if(CryptCreateHash(
hCryptProv,
CALG_MD5,
0,
0,
&hHash))
{
printf("An empty hash object has been created. \n");
} else {
MyHandleError("Error during CryptBeginHash (aqui)!\n");
}

When I run it, I got the following error code: 57. I found the
definition of this error code in Windows:

ERROR_ADAP_HDW_ERR
57 A network adapter hardware error occurred.

This code works with no error in XP Professional, but I've got this
error in XP Embedded. Any suggestion?

Thanks in advanced!

[David Jones]

Perro Flaco wrote:

> Hi everybody!
>
> I've got a problem with the following piece of code:
>
> if(CryptCreateHash(
> hCryptProv,
> CALG_MD5,
> 0,
> 0,
> &hHash))
> {
> printf("An empty hash object has been created. \n");
> } else {
> MyHandleError("Error during CryptBeginHash (aqui)!\n");
> }
>

Are you sure CryptAcquireContext succeeded and gave you a valid
hCryptProv?

Does the cryptographic provider support MD5? In the embedded
version of the OS, I think you can pick and choose which
components go in the platform (since many embedded systems
don't have enough room for and don't really need a lot of
standard desktop features), so you should definitely make
sure MD5 support is included in your platform build.

> When I run it, I got the following error code: 57. I found the
> definition of this error code in Windows:
>
> ERROR_ADAP_HDW_ERR
> 57 A network adapter hardware error occurred.
>
> This code works with no error in XP Professional, but I've got this
> error in XP Embedded. Any suggestion?
>
> Thanks in advanced!
>

Are you sure it wasn't 0x57? That is ERROR_INVALID_PARAMETER
("The parameter is incorrect."), which makes a lot more sense
than a network adapter hardware error in this context.

Note: If you are using MS Visual C++ 6, you can use "err, hr"
in a watch window to give you the symbolic error code instead
of the number so you don't have to worry whether you're reading
hex or decimal.

David