Re: [PATCH 3/4] lib: sha256: add support of key derivation

On Tue, 16 Jul 2024 at 17:06, Philippe Reynes philippe.reynes@softathome.com wrote:

Adds the support of key derivation using the scheme hkdf. This scheme is defined in rfc5869.

Signed-off-by: Philippe Reynes philippe.reynes@softathome.com

include/u-boot/sha256.h | 8 ++++++++ lib/sha256.c | 42 +++++++++++++++++++++++++++++++++++++++++ 2 files changed, 50 insertions(+)

Reviewed-by: Simon Glass sjg@chromium.org

diff --git a/include/u-boot/sha256.h b/include/u-boot/sha256.h index 7aa4c54d0d4..46d20bf9b79 100644 --- a/include/u-boot/sha256.h +++ b/include/u-boot/sha256.h @@ -6,6 +6,9 @@ #define SHA256_SUM_LEN 32 #define SHA256_DER_LEN 19

+#define SHA256_HKDF_MAX_INFO_LEN 256 +#define SHA256_HKDF_MAX_DATA_LEN (SHA256_HKDF_MAX_INFO_LEN + SHA256_SUM_LEN + 1)

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