diff options
| author | Philippe Reynes <philippe.reynes@softathome.com> | 2024-12-19 14:05:52 +0100 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2025-01-18 17:12:47 -0600 |
| commit | 12e841114db54bd2021b7c96002a0d2bd24fa646 (patch) | |
| tree | cb798f942b2ab67e76208c94c2a56e0f0c1aa69d /lib/mbedtls | |
| parent | 44ce63016d87350793d9ba26ff62f93f92c231ba (diff) | |
lib: mbedtls: sha256: add support of key derivation
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>
Reviewed-by: Raymond Mao <raymond.mao@linaro.org>
Diffstat (limited to 'lib/mbedtls')
| -rw-r--r-- | lib/mbedtls/sha256.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/lib/mbedtls/sha256.c b/lib/mbedtls/sha256.c index 7d456a82017..59edcb517df 100644 --- a/lib/mbedtls/sha256.c +++ b/lib/mbedtls/sha256.c @@ -12,6 +12,10 @@ #include <mbedtls/md.h> +#if CONFIG_IS_ENABLED(HKDF_MBEDTLS) +#include <mbedtls/hkdf.h> +#endif + const u8 sha256_der_prefix[SHA256_DER_LEN] = { 0x30, 0x31, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01, 0x05, @@ -48,3 +52,22 @@ int sha256_hmac(const unsigned char *key, int keylen, return mbedtls_md_hmac(md, key, keylen, input, ilen, output); } + +#if CONFIG_IS_ENABLED(HKDF_MBEDTLS) +int sha256_hkdf(const unsigned char *salt, int saltlen, + const unsigned char *ikm, int ikmlen, + const unsigned char *info, int infolen, + unsigned char *output, int outputlen) +{ + const mbedtls_md_info_t *md; + + md = mbedtls_md_info_from_type(MBEDTLS_MD_SHA256); + if (!md) + return MBEDTLS_ERR_MD_FEATURE_UNAVAILABLE; + + return mbedtls_hkdf(md, salt, saltlen, + ikm, ikmlen, + info, infolen, + output, outputlen); +} +#endif |