[PATCH v6 0/9] add the support of sha256_hmac and sha256_hkdf

[Philippe Reynes <philippe.reynes@softathome.com>]

This serie adds the support of sha256_hmac and sha256_hkdf.
A first version was sent several months ago just before the 
integration of mbedtls. This new version is based on mbedtls.

The first patch of this serie add the support of hkdf
using mbedtls.

v6:
- use const for test
- set buffer to 0 before using to to compute hmac

v5:
- use mbedtls to compute hmac
- add tests for hkdf
- enabled mbedtls in sandbox_defconfig
- some cleanup

v4:
- fix computation of the hmac
- add more test for hmac
- move sha256 common functions to sha256_common.c
- some cleanup

v3:
- also define sha256_hmac for legacy sha256
- add some #if to define function only when needed

Philippe Reynes (9):
  tools: kwbimage.h: use linux/compiler_attributes.h
  tools: renesas_spkgimage.h: use linux/compiler_attributes.h
  mbedtls: enable support of hkdf
  lib: sha256: move common function to sha256_common.c
  lib: sha256: add feature sha256_hmac
  test: lib: add test for sha256_hmac
  lib: mbedtls: sha256: add support of key derivation
  test: lib: add test for key derivation
  configs: sandbox: enable mbedtls

 configs/sandbox_defconfig        |   2 +
 include/u-boot/sha256.h          |  24 +++
 lib/Makefile                     |   1 +
 lib/mbedtls/Kconfig              |  14 ++
 lib/mbedtls/Makefile             |   2 +
 lib/mbedtls/mbedtls_def_config.h |   4 +
 lib/mbedtls/sha256.c             |  59 ++++---
 lib/sha256.c                     |  67 ++++---
 lib/sha256_common.c              |  50 ++++++
 test/lib/Makefile                |   2 +
 test/lib/test_sha256_hkdf.c      | 198 +++++++++++++++++++++
 test/lib/test_sha256_hmac.c      | 294 +++++++++++++++++++++++++++++++
 tools/Makefile                   |   1 +
 tools/kwbimage.h                 |   6 +-
 tools/renesas_spkgimage.h        |   6 +-
 15 files changed, 670 insertions(+), 60 deletions(-)
 create mode 100644 lib/sha256_common.c
 create mode 100644 test/lib/test_sha256_hkdf.c
 create mode 100644 test/lib/test_sha256_hmac.c

-- 
2.25.1