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Add entropy injection function to psa cripto APIs

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This commit is contained in:
Netanel Gonen 2018-11-19 11:53:02 +02:00 committed by avolinski
parent 3d5d8372a5
commit 2bcd312cda
2 changed files with 55 additions and 1 deletions
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27
include/psa/crypto_extra.h
View file

@ -34,6 +34,9 @@
extern "C" {
#endif
/* UID for secure storage seed */
#define MBED_RANDOM_SEED_ITS_UID 0xFFFFFF52
/**
* \brief Library deinitialization.
*
@ -44,6 +47,30 @@ extern "C" {
*/
void mbedtls_psa_crypto_free( void );
#if ( defined(MBEDTLS_ENTROPY_NV_SEED) && defined(MBEDTLS_PSA_HAS_ITS_IO) )
/**
* \brief Inject initial entropy seed into persistent storage for random capabilities.
*
* \warning This function **can** fail! Callers MUST check the return status.
*
* \note To use this function both mbedtls_nv_seed_read and mbedtls_nv_seed_write
* must be defined.
*
* \param seed[in] Buffer storing the seed value to inject.
* \param seed_size[in] Size of the \p seed buffer. The minimum size of the seed is MBEDTLS_ENTROPY_MIN_PLATFORM
*
* \retval #PSA_SUCCESS
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_NOT_PERMITTED
* \retval #PSA_ERROR_BAD_STATE
*/
psa_status_t mbedtls_psa_inject_entropy(const unsigned char *seed,
size_t seed_size);
#endif
#ifdef __cplusplus
}
#endif

29
library/psa_crypto.c
View file

@ -69,6 +69,7 @@
#include "mbedtls/ecdh.h"
#include "mbedtls/ecp.h"
#include "mbedtls/entropy.h"
#include "mbedtls/entropy_poll.h"
#include "mbedtls/error.h"
#include "mbedtls/gcm.h"
#include "mbedtls/md2.h"
@ -85,7 +86,9 @@
#include "mbedtls/sha512.h"
#include "mbedtls/xtea.h"
#if ( defined(MBEDTLS_ENTROPY_NV_SEED) && defined(MBEDTLS_PSA_HAS_ITS_IO) )
#include "psa_prot_internal_storage.h"
#endif
#define ARRAY_LENGTH( array ) ( sizeof( array ) / sizeof( *( array ) ) )
@ -4223,6 +4226,30 @@ psa_status_t psa_generate_random( uint8_t *output,
return( mbedtls_to_psa_error( ret ) );
}
#if ( defined(MBEDTLS_ENTROPY_NV_SEED) && defined(MBEDTLS_PSA_HAS_ITS_IO) )
psa_status_t mbedtls_psa_inject_entropy( const unsigned char *seed,
size_t seed_size )
{
psa_status_t status;
struct psa_its_info_t p_info;
if( global_data.initialized )
return( PSA_ERROR_NOT_PERMITTED );
if( ( seed_size < MBEDTLS_ENTROPY_MIN_PLATFORM ) || ( seed_size > MBEDTLS_ENTROPY_MAX_SEED_SIZE ) )
return( PSA_ERROR_INVALID_ARGUMENT );
status = psa_its_get_info( MBED_RANDOM_SEED_ITS_UID, &p_info );
if( PSA_ITS_ERROR_KEY_NOT_FOUND == status ) /* No seed exists */
{
status = psa_its_set( MBED_RANDOM_SEED_ITS_UID, seed_size, seed, 0 );
}
else if( PSA_ITS_SUCCESS == status )
{
/* You should not be here. Seed needs to be injected only once */
status = PSA_ERROR_NOT_PERMITTED;
}
return( status );
}
#endif
psa_status_t psa_generate_key( psa_key_slot_t key,
psa_key_type_t type,
size_t bits,