[xmlsec] aes-gcm mode

[David Bailey]

Hi,

Now that the Microsoft CNG backend in available I was wondering if it would be possible to add the aes-gcm algorithms?

I've made a first pass at doing this - both for mscng and the openssl backends. Would you be open to reviewing a pull request?
There are no tests as yet, and I'm not sure of the best way to indicate decryption failure, but it would be great to get the ball rolling.

Cheers,
                Dave
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