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* this seems to be the most likely candidate for the crypto metldr/bootldr uses http://csrc.nist.gov/groups/ST/toolkit/BCM/documents/proposedmodes/gcm/gcm-spec.pdf
* this seems to be the most likely candidate for the crypto metldr/bootldr uses http://csrc.nist.gov/groups/ST/toolkit/BCM/documents/proposedmodes/gcm/gcm-spec.pdf
* https://www.psdevwiki.com/ps3/File:e4To6o6.png
<pre>
Inputs and Outputs
GCM has two operations, authenticated encryption and authenticated decryption. The authenticated
encryption operation has four inputs, each of which is a bit string:
• A secret key K, whose length is appropriate for the underlying block cipher.
• An initialization vector IV , that can have any number of bits between 1 and 264. For a fixed
value of the key, each IV value must be distinct, but need not have equal lengths. <b>96-bit
IV values can be processed more efficiently, so that length is recommended for situations in
which efficiency is critical.</b>
• A plaintext P, which can have any number of bits between 0 and 239 − 256.
• Additional authenticated data (AAD), which is denoted as A. This data is authenticated, but
not encrypted, and can have any number of bits between 0 and 264.
</pre>
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