ima-evm-utils: Implement function to only create IMA signature

This series of patches implements imaevm_create_ima_signature, a function that only creates an IMA v2 signature but does not write it into an xattr. This API fullfills a requirement of rpm-ostree where a tool is being built to sign all files from something similar to a tar byte stream, though where files are written to temporary files for signing purpose but the signature itself should not be written into the filesystem's xattr but simply returned via the API.

Stefan

v2:
- use imaevm_calc_hash to also cover hash calculations of links, directories etc.

Stefan Berger (3):
libimaevm: Implement imaevm_create_ima_signature
tests: Add program to create IMA signature with new API call
libimaevm: Have sign_hash_v2 call sign_hash_v2_pkey after reading key
file

 src/imaevm.h                 |   2 +
 src/libimaevm.c              | 148 ++++++++++++++++++++++++++++-------
 tests/Makefile.am            |   6 ++
 tests/create_ima_signature.c | 111 ++++++++++++++++++++++++++
 tests/sign_verify.test       |  21 ++++-
 5 files changed, 257 insertions(+), 31 deletions(-)
 create mode 100644 tests/create_ima_signature.c

2.30.2