mbedtls/tests/suites/test_suite_psa_crypto_entropy.function

/* BEGIN_HEADER */
#include <stdint.h>

#include "psa/crypto.h"
#include "psa_prot_internal_storage.h"
#include "mbedtls/entropy.h"
#include "mbedtls/entropy_poll.h"

/* MAX value support macro */
#if !defined(MAX)
#define MAX(a,b) (((a)>(b))?(a):(b))
#endif

/* Calculating the minimum allowed entropy size in bytes */
#define MBEDTLS_PSA_INJECT_ENTROPY_MIN_SIZE MAX(MBEDTLS_ENTROPY_MIN_PLATFORM, MBEDTLS_ENTROPY_BLOCK_SIZE)

/* END_HEADER */

/* BEGIN_DEPENDENCIES
 * depends_on:MBEDTLS_ENTROPY_NV_SEED:MBEDTLS_PSA_HAS_ITS_IO:MBEDTLS_PSA_CRYPTO_C
 * END_DEPENDENCIES
 */

/* BEGIN_CASE */
void validate_entropy_seed_injection( int seed_length_a,
                                      int expected_status_a,
                                      int seed_length_b,
                                      int expected_status_b )
{
    psa_its_status_t its_status;
    psa_status_t status;
    uint8_t output[32] = { 0 };
    uint8_t zeros[32] = { 0 };
    uint8_t *seed = NULL;
    int i;
    int seed_size;
    if( seed_length_a > seed_length_b )
    {
        seed_size = seed_length_a;
    }
    else
    {
        seed_size = seed_length_b;
    }
    ASSERT_ALLOC( seed, seed_size );
    /* fill seed with some data */
    for( i = 0; i < seed_size; ++i )
    {
        seed[i] = i;
    }
    its_status =  psa_its_remove( MBEDTLS_RANDOM_SEED_ITS_UID );
    TEST_ASSERT( ( its_status == PSA_ITS_SUCCESS ) ||
                 ( its_status == PSA_ITS_ERROR_KEY_NOT_FOUND ) );
    status = mbedtls_psa_inject_entropy( seed, seed_length_a );
    TEST_ASSERT( status == expected_status_a );
    status = mbedtls_psa_inject_entropy( seed, seed_length_b );
    TEST_ASSERT( status == expected_status_b );
    TEST_ASSERT( psa_crypto_init( ) == PSA_SUCCESS );
    TEST_ASSERT( psa_generate_random( output,
                                      sizeof( output ) ) == PSA_SUCCESS );
    TEST_ASSERT( memcmp( output, zeros, sizeof( output ) ) != 0 );
exit:
    mbedtls_free( seed );
    psa_its_remove( MBEDTLS_RANDOM_SEED_ITS_UID );
    mbedtls_psa_crypto_free( );
}
/* END_CASE */

/* BEGIN_CASE */
void run_entropy_inject_with_crypto_init( )
{
    psa_its_status_t its_status;
    psa_status_t status;
    int i;
    uint8_t seed[MBEDTLS_PSA_INJECT_ENTROPY_MIN_SIZE] = { 0 };
    /* fill seed with some data */
    for( i = 0; i < sizeof( seed ); ++i )
    {
        seed[i] = i;
    }
    its_status =  psa_its_remove( MBEDTLS_RANDOM_SEED_ITS_UID );
    TEST_ASSERT( ( its_status == PSA_ITS_SUCCESS ) ||
                 ( its_status == PSA_ITS_ERROR_KEY_NOT_FOUND ) );
    status = mbedtls_psa_inject_entropy( seed, sizeof( seed ) );
    TEST_ASSERT( status == PSA_SUCCESS );
    its_status =  psa_its_remove( MBEDTLS_RANDOM_SEED_ITS_UID );
    TEST_ASSERT( its_status == PSA_ITS_SUCCESS );
    status = psa_crypto_init( );
    TEST_ASSERT( status == PSA_ERROR_INSUFFICIENT_ENTROPY );
    status = mbedtls_psa_inject_entropy( seed, sizeof( seed ) );
    TEST_ASSERT( status == PSA_SUCCESS );
    status = psa_crypto_init( );
    TEST_ASSERT( status == PSA_SUCCESS );
    mbedtls_psa_crypto_free( );
    /* The seed is written by nv_seed callback functions therefore the injection will fail */
    status = mbedtls_psa_inject_entropy( seed, sizeof( seed ) );
    TEST_ASSERT( status == PSA_ERROR_NOT_PERMITTED );
exit:
    psa_its_remove( MBEDTLS_RANDOM_SEED_ITS_UID );
    mbedtls_psa_crypto_free( );
}
/* END_CASE */