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Adding Secure Lock to lock the device with a random 256 bit key.

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This is an extra layer of security to avoid brute force attacks if PIN is too weak.
At every hard reset (on device plug), the device must be unlocked prior any other command. Once unlocked, the device can be used as usual.

Signed-off-by: Pol Henarejos <pol.henarejos@cttc.es>
This commit is contained in:
Pol Henarejos
2022-10-31 15:09:54 +01:00
parent eda8b53949
commit 00279da8d5
5 changed files with 215 additions and 4 deletions
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14
src/hsm/kek.h
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@@ -18,6 +18,8 @@
#ifndef _DKEK_H_
#define _DKEK_H_
#include "crypto_utils.h"
extern int load_mkek(uint8_t *);
extern int store_mkek(const uint8_t *);
extern int save_dkek_key(uint8_t, const uint8_t *key);
@@ -45,4 +47,16 @@ extern int dkek_decode_key(uint8_t, void *key_ctx, const uint8_t *in, size_t in_
#define MKEK_CHECKSUM(p) (MKEK_KEY(p)+MKEK_KEY_SIZE)
#define DKEK_KEY_SIZE (32)
extern uint8_t mkek_mask[MKEK_KEY_SIZE];
extern bool has_mkek_mask;
typedef struct mse {
uint8_t Qpt[65];
uint8_t key_enc[12 + 32];
bool init;
} mse_t;
extern mse_t mse;
extern int mse_decrypt_ct(uint8_t *, size_t);
#endif