Test clear text writing to and reading from a slot

atecc608a_utils.c

@@ -61,3 +61,25 @@ psa_status_t atecc608a_check_config_locked()
     }
     return status;
 }
+
+psa_status_t atecc608a_random_32_bytes(uint8_t *rand_out, size_t buffer_size)
+{
+    psa_status_t status = PSA_ERROR_GENERIC_ERROR;
+
+    if (rand_out == NULL)
+    {
+        return PSA_ERROR_INVALID_ARGUMENT;
+    }
+
+    if (buffer_size < 32)
+    {
+        return PSA_ERROR_BUFFER_TOO_SMALL;
+    }
+
+    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_32_bytes(uint8_t *rand_out, size_t buffer_size);
+
 #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_32_bytes(data_write, TEST_WRITE_READ_SIZE));
+    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 {
@@ -165,6 +183,10 @@ int main(void)
     /* Verify that the device has a locked config before doing anything */
     ASSERT_SUCCESS_PSA(atecc608a_check_config_locked());
 
+    /* Slot 8 is usually used as a clear write and read certificate
+     * or signature slot, as it is the biggest one (416 bytes of space). */
+    test_write_read_slot(8);
+
     /* Test that a public key received during a private key generation
      * can be imported */
     ASSERT_SUCCESS_PSA(atecc608a_drv_info.p_key_management->p_generate(

mbed-os-atecc608a.lib

@@ -1 +1 @@
-https://github.com/ARMmbed/mbed-os-atecc608a/#bae7de43d835aea03c4fd7af382232d8b5d26ad7
+https://github.com/ARMmbed/mbed-os-atecc608a/#5f7e5687b935703f3507aa30aaa9de3f2bc104d0

tests/atecc608a.log

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