3 ms·
The answer to your question: The AES mode AMD SEV uses is similar to XEX. AMD computes a tweak value based on the physical memory address and performs an xor-e
by nellydpa 6y ago
The answer to your question: The AES mode AMD SEV uses is similar to XEX. AMD computes a tweak value based on the physical memory address and performs an xor-encrypt-xor operation. The tweak algorithm used on Rome (2nd gen EPYC) is based on GF math and uses a random value that is changed on each boot.