GnuPG MPILIB

Looks like the linux kernel 3.3 will have GnuPG MPILIB within.

Multiprecision maths library (MPILIB) [N/m/y/?] (NEW) ?

CONFIG_MPILIB:

Multiprecision maths library from GnuPG.
It is used to implement RSA digital signature verification,
which is used by IMA/EVM digital signature extension.

Symbol: MPILIB [=n]
Type  : tristate
Prompt: Multiprecision maths library
  Defined at lib/Kconfig:288
  Location:
    -> Library routines
  Selected by: DIGSIG [=n] && KEYS [=y]

In-kernel signature checker (DIGSIG) [N/m/y/?] (NEW) ?

CONFIG_DIGSIG:

Digital signature verification. Currently only RSA is supported.
Implementation is done using GnuPG MPI library

Symbol: DIGSIG [=n]
Type  : tristate
Prompt: In-kernel signature checker
  Defined at lib/Kconfig:305
  Depends on: KEYS [=y]
  Location:
    -> Library routines
  Selects: MPILIB [=m]
  Selected by: INTEGRITY_DIGSIG [=n] && INTEGRITY [=n] && KEYS [=y]