[RFC 0/1] ima/evm: signature verification support using asymmetric keys

[Dmitry Kasatkin <dmitry.kasatkin@intel.com>]

Asymmetric keys were introduced in linux-3.7 to verify the signature on signed
kernel modules.  The asymmetric keys infrastructure abstracts the signature
verification from the crypto details.  This patch adds IMA/EVM signature
verification using asymmetric keys.  Support for additional signature
verification methods can now be delegated to the asymmetric key infrastructure.

Although the module signature header and the IMA/EVM signature header could
use the same header format, to minimize the signature length and save space
in the extended attribute, the IMA/EVM header format is different than the
module signature header.  The main difference is that the key identifier is
a sha1[12 - 19] hash of the key modulus and exponent and similar to the current
implementation. The only purpose is to identify corresponding key in the kernel
keyring. ima-evm-utils was updated to support the new signature format.

BR,
Dmitry

Dmitry Kasatkin (1):
  ima: digital signature verification using asymmetric keys

 security/integrity/Kconfig  |   12 +++++
 security/integrity/digsig.c |  103 ++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 114 insertions(+), 1 deletion(-)

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1.7.10.4