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lib: mbedtls: sha256: add support of key derivation

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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>
This commit is contained in:
Philippe Reynes 2024-12-19 14:05:52 +01:00 • committed by Tom Rini
parent 44ce63016d
commit 12e841114d
2 changed files with 43 additions and 0 deletions
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20
include/u-boot/sha256.h
View file

@ -1,6 +1,8 @@
#ifndef _SHA256_H
#define _SHA256_H
#include <linux/compiler_attributes.h>
#include <linux/errno.h>
#include <linux/kconfig.h>
#include <linux/types.h>
@ -49,4 +51,22 @@ int sha256_hmac(const unsigned char *key, int keylen,
const unsigned char *input, unsigned int ilen,
unsigned char *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);
#else
static inline int sha256_hkdf(const unsigned char __always_unused *salt,
int __always_unused saltlen,
const unsigned char __always_unused *ikm,
int __always_unused ikmlen,
const unsigned char __always_unused *info,
int __always_unused infolen,
unsigned char __always_unused *output,
int __always_unused outputlen) {
return -EOPNOTSUPP;
}
#endif
#endif /* _SHA256_H */

23
lib/mbedtls/sha256.c
View file

@ -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