288 lines
8.6 KiB
C
288 lines
8.6 KiB
C
/* BEGIN_HEADER */
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#include <stdint.h>
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/* Some tests in this module configure entropy sources. */
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#include "psa_crypto_invasive.h"
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#include "mbedtls/entropy.h"
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#include "entropy_poll.h"
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#define ENTROPY_MIN_NV_SEED_SIZE \
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MAX(MBEDTLS_ENTROPY_MIN_PLATFORM, MBEDTLS_ENTROPY_BLOCK_SIZE)
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#include "psa_crypto_random_impl.h"
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#if defined(MBEDTLS_PSA_HMAC_DRBG_MD_TYPE)
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/* PSA crypto uses the HMAC_DRBG module. It reads from the entropy source twice:
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* once for the initial entropy and once for a nonce. The nonce length is
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* half the entropy length. For SHA-256, SHA-384 or SHA-512, the
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* entropy length is 256 per the documentation of mbedtls_hmac_drbg_seed(),
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* and PSA crypto doesn't support other hashes for HMAC_DRBG. */
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#define ENTROPY_NONCE_LEN (256 / 2)
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#else
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/* PSA crypto uses the CTR_DRBG module. In some configurations, it needs
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* to read from the entropy source twice: once for the initial entropy
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* and once for a nonce. */
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#include "mbedtls/ctr_drbg.h"
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#define ENTROPY_NONCE_LEN MBEDTLS_CTR_DRBG_ENTROPY_NONCE_LEN
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#endif
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#if !defined(MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG)
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typedef struct {
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size_t threshold; /* Minimum bytes to make mbedtls_entropy_func happy */
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size_t max_steps;
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size_t *length_sequence;
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size_t step;
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} fake_entropy_state_t;
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static int fake_entropy_source(void *state_arg,
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unsigned char *output, size_t len,
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size_t *olen)
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{
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fake_entropy_state_t *state = state_arg;
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size_t i;
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if (state->step >= state->max_steps) {
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return MBEDTLS_ERR_ENTROPY_SOURCE_FAILED;
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}
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*olen = MIN(len, state->length_sequence[state->step]);
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for (i = 0; i < *olen; i++) {
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output[i] = i;
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}
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++state->step;
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return 0;
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}
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#define ENTROPY_SOURCE_PLATFORM 0x00000001
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#define ENTROPY_SOURCE_TIMING 0x00000002
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#define ENTROPY_SOURCE_HARDWARE 0x00000004
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#define ENTROPY_SOURCE_NV_SEED 0x00000008
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#define ENTROPY_SOURCE_FAKE 0x40000000
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static uint32_t custom_entropy_sources_mask;
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static fake_entropy_state_t fake_entropy_state;
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/* This is a modified version of mbedtls_entropy_init() from entropy.c
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* which chooses entropy sources dynamically. */
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static void custom_entropy_init(mbedtls_entropy_context *ctx)
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{
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ctx->source_count = 0;
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memset(ctx->source, 0, sizeof(ctx->source));
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#if defined(MBEDTLS_THREADING_C)
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mbedtls_mutex_init(&ctx->mutex);
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#endif
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ctx->accumulator_started = 0;
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mbedtls_md_init(&ctx->accumulator);
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#if !defined(MBEDTLS_NO_PLATFORM_ENTROPY)
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if (custom_entropy_sources_mask & ENTROPY_SOURCE_PLATFORM) {
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mbedtls_entropy_add_source(ctx, mbedtls_platform_entropy_poll, NULL,
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MBEDTLS_ENTROPY_MIN_PLATFORM,
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MBEDTLS_ENTROPY_SOURCE_STRONG);
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}
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#endif
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#if defined(MBEDTLS_ENTROPY_HARDWARE_ALT)
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if (custom_entropy_sources_mask & ENTROPY_SOURCE_HARDWARE) {
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mbedtls_entropy_add_source(ctx, mbedtls_hardware_poll, NULL,
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MBEDTLS_ENTROPY_MIN_HARDWARE,
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MBEDTLS_ENTROPY_SOURCE_STRONG);
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}
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#endif
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#if defined(MBEDTLS_ENTROPY_NV_SEED)
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if (custom_entropy_sources_mask & ENTROPY_SOURCE_NV_SEED) {
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mbedtls_entropy_add_source(ctx, mbedtls_nv_seed_poll, NULL,
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MBEDTLS_ENTROPY_BLOCK_SIZE,
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MBEDTLS_ENTROPY_SOURCE_STRONG);
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ctx->initial_entropy_run = 0;
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} else {
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/* Skip the NV seed even though it's compiled in. */
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ctx->initial_entropy_run = 1;
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}
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#endif
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if (custom_entropy_sources_mask & ENTROPY_SOURCE_FAKE) {
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mbedtls_entropy_add_source(ctx,
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fake_entropy_source, &fake_entropy_state,
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fake_entropy_state.threshold,
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MBEDTLS_ENTROPY_SOURCE_STRONG);
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}
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}
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#endif /* !defined(MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG) */
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/* END_HEADER */
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/* BEGIN_DEPENDENCIES
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* depends_on:MBEDTLS_PSA_CRYPTO_C
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* END_DEPENDENCIES
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*/
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/* BEGIN_CASE depends_on:MBEDTLS_ENTROPY_NV_SEED:!MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG */
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void create_nv_seed()
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{
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static unsigned char seed[ENTROPY_MIN_NV_SEED_SIZE];
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TEST_ASSERT(mbedtls_nv_seed_write(seed, sizeof(seed)) >= 0);
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}
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/* END_CASE */
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/* BEGIN_CASE */
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void init_deinit(int count)
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{
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psa_status_t status;
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int i;
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for (i = 0; i < count; i++) {
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status = psa_crypto_init();
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PSA_ASSERT(status);
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status = psa_crypto_init();
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PSA_ASSERT(status);
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PSA_DONE();
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}
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}
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/* END_CASE */
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/* BEGIN_CASE */
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void deinit_without_init(int count)
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{
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int i;
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for (i = 0; i < count; i++) {
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PSA_ASSERT(psa_crypto_init());
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PSA_DONE();
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}
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PSA_DONE();
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}
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/* END_CASE */
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/* BEGIN_CASE */
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void validate_module_init_generate_random(int count)
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{
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psa_status_t status;
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uint8_t random[10] = { 0 };
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int i;
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for (i = 0; i < count; i++) {
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status = psa_crypto_init();
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PSA_ASSERT(status);
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PSA_DONE();
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}
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status = psa_generate_random(random, sizeof(random));
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TEST_EQUAL(status, PSA_ERROR_BAD_STATE);
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}
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/* END_CASE */
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/* BEGIN_CASE */
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void validate_module_init_key_based(int count)
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{
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psa_status_t status;
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uint8_t data[10] = { 0 };
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psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
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mbedtls_svc_key_id_t key = mbedtls_svc_key_id_make(0xdead, 0xdead);
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int i;
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for (i = 0; i < count; i++) {
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status = psa_crypto_init();
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PSA_ASSERT(status);
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PSA_DONE();
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}
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psa_set_key_type(&attributes, PSA_KEY_TYPE_RAW_DATA);
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status = psa_import_key(&attributes, data, sizeof(data), &key);
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TEST_EQUAL(status, PSA_ERROR_BAD_STATE);
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TEST_ASSERT(mbedtls_svc_key_id_is_null(key));
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}
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/* END_CASE */
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/* BEGIN_CASE depends_on:!MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG */
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void custom_entropy_sources(int sources_arg, int expected_init_status_arg)
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{
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psa_status_t expected_init_status = expected_init_status_arg;
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uint8_t random[10] = { 0 };
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custom_entropy_sources_mask = sources_arg;
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PSA_ASSERT(mbedtls_psa_crypto_configure_entropy_sources(
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custom_entropy_init, mbedtls_entropy_free));
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TEST_EQUAL(psa_crypto_init(), expected_init_status);
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if (expected_init_status != PSA_SUCCESS) {
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goto exit;
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}
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PSA_ASSERT(psa_generate_random(random, sizeof(random)));
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exit:
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PSA_DONE();
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}
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/* END_CASE */
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/* BEGIN_CASE depends_on:!MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG */
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void fake_entropy_source(int threshold,
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int amount1,
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int amount2,
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int amount3,
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int amount4,
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int expected_init_status_arg)
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{
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psa_status_t expected_init_status = expected_init_status_arg;
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uint8_t random[10] = { 0 };
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size_t lengths[4];
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fake_entropy_state.threshold = threshold;
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fake_entropy_state.step = 0;
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fake_entropy_state.max_steps = 0;
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if (amount1 >= 0) {
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lengths[fake_entropy_state.max_steps++] = amount1;
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}
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if (amount2 >= 0) {
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lengths[fake_entropy_state.max_steps++] = amount2;
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}
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if (amount3 >= 0) {
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lengths[fake_entropy_state.max_steps++] = amount3;
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}
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if (amount4 >= 0) {
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lengths[fake_entropy_state.max_steps++] = amount4;
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}
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fake_entropy_state.length_sequence = lengths;
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custom_entropy_sources_mask = ENTROPY_SOURCE_FAKE;
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PSA_ASSERT(mbedtls_psa_crypto_configure_entropy_sources(
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custom_entropy_init, mbedtls_entropy_free));
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TEST_EQUAL(psa_crypto_init(), expected_init_status);
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if (expected_init_status != PSA_SUCCESS) {
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goto exit;
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}
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PSA_ASSERT(psa_generate_random(random, sizeof(random)));
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exit:
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PSA_DONE();
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}
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/* END_CASE */
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/* BEGIN_CASE depends_on:MBEDTLS_ENTROPY_NV_SEED:!MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG */
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void entropy_from_nv_seed(int seed_size_arg,
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int expected_init_status_arg)
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{
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psa_status_t expected_init_status = expected_init_status_arg;
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uint8_t random[10] = { 0 };
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uint8_t *seed = NULL;
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size_t seed_size = seed_size_arg;
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ASSERT_ALLOC(seed, seed_size);
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TEST_ASSERT(mbedtls_nv_seed_write(seed, seed_size) >= 0);
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custom_entropy_sources_mask = ENTROPY_SOURCE_NV_SEED;
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PSA_ASSERT(mbedtls_psa_crypto_configure_entropy_sources(
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custom_entropy_init, mbedtls_entropy_free));
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TEST_EQUAL(psa_crypto_init(), expected_init_status);
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if (expected_init_status != PSA_SUCCESS) {
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goto exit;
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}
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PSA_ASSERT(psa_generate_random(random, sizeof(random)));
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exit:
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mbedtls_free(seed);
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PSA_DONE();
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}
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/* END_CASE */
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