Test clear text writing to and reading from a slot

Generate random data, write it to a slot and verify with a read

Author: Andrzej Kurek

atecc608a_utils.c

@@ -61,3 +61,20 @@ psa_status_t atecc608a_check_config_locked()
     }
     return status;
 }
+
+psa_status_t atecc608a_random(uint8_t *rand_out)
+{
+    psa_status_t status = PSA_ERROR_GENERIC_ERROR;
+
+    if (rand_out == NULL)
+    {
+        return PSA_ERROR_INVALID_ARGUMENT;
+    }
+
+    ASSERT_SUCCESS_PSA(atecc608a_init());
+    ASSERT_SUCCESS(atcab_random(rand_out));
+
+exit:
+    atecc608a_deinit();
+    return status;
+}

atecc608a_utils.h

@@ -61,4 +61,7 @@ psa_status_t atecc608a_get_serial_number(uint8_t *buffer, size_t buffer_size,
 
 psa_status_t atecc608a_check_config_locked();
 
+/** Generate a 32 byte random number from the CryptoAuth device. */
+psa_status_t atecc608a_random(uint8_t *rand_out);
+
 #endif /* ATECC608A_SE_H */

main.c

@@ -117,6 +117,24 @@ psa_status_t atecc608a_print_config_zone()
     return status;
 }
 
+#define TEST_WRITE_READ_SIZE 32
+psa_status_t test_write_read_slot(uint16_t slot)
+{
+    psa_status_t status = PSA_ERROR_GENERIC_ERROR;
+    uint8_t data_write[TEST_WRITE_READ_SIZE] = {};
+    uint8_t data_read[TEST_WRITE_READ_SIZE] = {};
+
+    ASSERT_SUCCESS_PSA(atecc608a_random(data_write));
+    ASSERT_SUCCESS_PSA(atecc608a_write(slot, 0, data_write, TEST_WRITE_READ_SIZE));
+    ASSERT_SUCCESS_PSA(atecc608a_read(slot, 0, data_read, TEST_WRITE_READ_SIZE));
+    ASSERT_STATUS(memcmp(data_write, data_read, TEST_WRITE_READ_SIZE),
+                  0, PSA_ERROR_HARDWARE_FAILURE);
+
+    printf("test_write_read_slot succesful!\n");
+exit:
+    return status;
+}
+
 int main(void)
 {
     enum {
@@ -172,6 +190,8 @@ int main(void)
     /* Verify that the device has a locked config before doing anything */
     ASSERT_SUCCESS_PSA(atecc608a_check_config_locked());
 
+    test_write_read_slot(8);
+
     ASSERT_SUCCESS_PSA(atecc608a_drv_info.p_key_management->p_export(
                          atecc608a_key_slot_device, pubkey, sizeof(pubkey),
                          &pubkey_len));

tests/atecc608a.log

@@ -4,4 +4,5 @@ Success!
 SHA-256:
 Success!
   - Config locked: 1
+test_write_read_slot succesful!
 Verification successful!