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Hi,

 

SJCL has a GCM mode:

https://github.com/bitwiseshiftleft/sjcl/blob/cc887b518c026407e4ad11ecef37ad9e40d4bd40/core/gcm.js

 

You can also use encrypt with execCommand() or via an external API if JS isn't an option.

 

Thanks,

-Jon

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