[personalize] pad UJSON messages to fixed sizes

To facilitate bringup of the personalization flow in an ATE environment
fixed sized UJSON messages are required. This updates the
personalization flow to pad all UJSON messages between the host and
device with whitespace before each message's trailing "}" character to
ensure fixed size data transmissions.

Signed-off-by: Tim Trippel <[email protected]>
(cherry picked from commit b05b4f7)

Author: timothytrippel

sw/device/silicon_creator/manuf/base/ft_personalize.c

@@ -888,7 +888,8 @@ static status_t personalize_endorse_certificates(ujson_t *uj) {
   // DO NOT CHANGE THE BELOW STRING without modifying the host code in
   // sw/host/provisioning/ft_lib/src/lib.rs
   base_printf("Exporting TBS certificates ...\n");
-  RESP_OK(ujson_serialize_perso_blob_t, uj, &perso_blob_to_host);
+  RESP_OK_PADDED_NO_CRC(ujson_serialize_with_padding_perso_blob_t, uj,
+                        &perso_blob_to_host, kPersoBlobSerializedMaxSize);
 
   // Import endorsed certificates from the provisioning appliance.
   // DO NOT CHANGE THE BELOW STRING without modifying the host code in
@@ -999,7 +1000,8 @@ static status_t personalize_endorse_certificates(ujson_t *uj) {
 
 static status_t send_final_hash(ujson_t *uj, serdes_sha256_hash_t *hash) {
   TRY(dif_gpio_write(&gpio, kGpioPinSpiConsoleTxReady, true));
-  TRY(RESP_OK(ujson_serialize_serdes_sha256_hash_t, uj, hash));
+  TRY(RESP_OK_PADDED_NO_CRC(ujson_serialize_with_padding_serdes_sha256_hash_t,
+                            uj, hash, kSerdesSha256HashSerializedMaxSize));
   TRY(dif_gpio_write(&gpio, kGpioPinSpiConsoleTxReady, false));
   return OK_STATUS();
 }

sw/host/provisioning/ft_lib/src/lib.rs

@@ -35,10 +35,10 @@ use ot_certs::x509::parse_certificate;
 use ot_hal::dif::lc_ctrl::{DifLcCtrlState, LcCtrlReg};
 use perso_tlv_lib::perso_tlv_get_field;
 use perso_tlv_lib::{CertHeader, CertHeaderType, ObjHeader, ObjHeaderType, ObjType};
-use ujson_lib::UjsonPayloads;
 use ujson_lib::provisioning_data::{
     LcTokenHash, ManufCertgenInputs, ManufFtIndividualizeData, PersoBlob, SerdesSha256Hash,
 };
+use ujson_lib::*;
 use util_lib::hash_lc_token;
 use util_lib::response::*;
 
@@ -219,7 +219,7 @@ fn send_rma_unlock_token_hash(
     )?;
     ujson_payloads.dut_in.insert(
         "FT_PERSO_RMA_TOKEN_HASH".to_string(),
-        rma_token_hash.send_with_crc(spi_console)?,
+        rma_token_hash.send_with_padding(spi_console, LC_TOKEN_HASH_SERIALIZED_MAX_SIZE)?,
     );
     Ok(())
 }
@@ -342,7 +342,8 @@ fn provision_certificates(
     let t0 = Instant::now();
     ujson_payloads.dut_in.insert(
         "FT_PERSO_CERTGEN_INPUTS".to_string(),
-        perso_certgen_inputs.send(spi_console)?,
+        perso_certgen_inputs
+            .send_with_padding(spi_console, MANUF_CERTGEN_INPUTS_SERIALIZED_MAX_SIZE)?,
     );
     response.stats.log_elapsed_time("perso-certgen-inputs", t0);
 
@@ -524,7 +525,7 @@ fn provision_certificates(
     let _ = UartConsole::wait_for(spi_console, r"Importing endorsed certificates ...", timeout)?;
     ujson_payloads.dut_in.insert(
         "FT_PERSO_DATA_IN".to_string(),
-        manuf_perso_data_back.send(spi_console)?,
+        manuf_perso_data_back.send_with_padding(spi_console, PERSO_BLOB_SERIALIZED_MAX_SIZE)?,
     );
     let _ = UartConsole::wait_for(spi_console, r"Finished importing certificates.", timeout)?;
     response.stats.log_elapsed_time("perso-import-certs", t0);