I am currently researching the Crypto Server and its ability to operate while in sleep or deepsleep.
In general, to get to the ultra low power modes, the CPU turns off power to internal functional blocks. If the Crypto Server is still processing when the CPU is trying to go to (deep)sleep, the logic states flipping will cause the current consumption to go higher.
Still researching ...
It doesn't specify the Crypto block directly however look the row listed "High-Speed Clock (IMO, ECO, PLL, FLL)" If the Crypto block is clocked from one of these sources then if the mode indicates "OFF" then the Crypto block is at best halted or at worst the registers are dead if the power is removed.
Thank you, LePo, very informative answer.