this commit refactors the signature checks. First we introduce a common pm3 generic private / public key pair in order to allow for users to self sign their own modded device. The verification checks now looks at both hard coded public keys. If a vendor wants to add their own public key thus allowing for a simple way for us to identify their devices they can now do so. The downside is that the firmware mismatch detection becomes a bit dodgy. mem info; mem info -v; mem info -s -p <filename.pem>; mem info -s -p <filename.pem> -w contains the changes. OBS! when -w be careful to not overwrite your genuine RDV4 signature. As always, with great power comes great responsibility

Author: iceman1001

CHANGELOG.md

@@ -3,23 +3,25 @@ All notable changes to this project will be documented in this file.
 This project uses the changelog in accordance with [keepchangelog](http://keepachangelog.com/). Please use this to write notable changes, which is not the same as git commit log...
 
 ## [unreleased][unreleased]
+- Changed `mem info` and how the signature handling is done (@iceman1001)
+- Added `client/resources/pm3_generic_private_key.pem` in order to self-sign a modded device (@iceman1001)
 - Fix `hf mfdes value --op clear` commands for clearing more than 0x80000000 values and getfilesettings mac mode (@merlokk)
 - Added ATR fingerprinting to `hf 14a/14b info` (@doegox)
 
 ## [Phrack.4.20728][2025-09-11]
-- Change `lf t55xx restore` - now skips writing block0 if its all zeros (@iceman1001)
+- Changed `lf t55xx restore` - now skips writing block0 if its all zeros (@iceman1001)
 - Added `HID Simplex Grinnell 36-bit` - Improved Simplex decoder (@datafx, @henrygab)
-- Change `lf search` - also test for chipset even if there was just signal noice (@iceman1001)
+- Changed `lf search` - also test for chipset even if there was just signal noice (@iceman1001)
 - Added detection of PCF 7961 , thanks progman (@iceman1001)
-- Change `reveng -g` - now correctly take 1024 hexstring as input (@iceman1001)
+- Changed `reveng -g` - now correctly take 1024 hexstring as input (@iceman1001)
 - Added `--override` parameter to NDEF read for overriding MAD CRC check (@iceman1001)
 - Added `hf saflok` commands (@stiebeljoshua)
 - Added `ntag_clean.lua` script for easier NTAG memory wipe (@trigat)
 - Changed from Bigbuf malloc to Bigbuf calloc calls on device side (@iceman1001)
 - Added `lf t55xx view` - now viewing of T55XX dump files is possible (@iceman1001)
 - Fixed `lf indala cone` - now writing the right bits when using `--fc` and `--cn`
 - Changed readline hack logic for async dbg msg to be ready for readline 8.3 (@doegox)
-- Improved To avoid conflicts with ModemManager on Linux, is recommended to masking the service (@grugnoymeme)
+- Changed documentation to avoid conflicts with ModemManager on Linux, is recommended to masking the service (@grugnoymeme)
 - Changed `data crypto` - now also handles AES-256 (@iceman1001)
 - Changed `hf mfdes info` - add recognition of Swissbit iShield Key Mifare (@ah01)
 - Changed `hf mf info` - add detection for unknown backdoor keys and for some backdoor variants (@doegox)

armsrc/appmain.c

@@ -2968,7 +2968,7 @@ static void PacketReceived(PacketCommandNG *packet) {
             LED_B_OFF();
             break;
         }
-        case CMD_FLASHMEM_INFO: {
+        case CMD_FLASHMEM_GET_SIGNATURE: {
 
             LED_B_ON();
 
@@ -2983,12 +2983,19 @@ static void PacketReceived(PacketCommandNG *packet) {
                 FlashStop();
             }
 
-            reply_ng(CMD_FLASHMEM_INFO, (isok) ? PM3_SUCCESS : PM3_EFLASH, (uint8_t *)info, sizeof(rdv40_validation_t));
+            reply_ng(CMD_FLASHMEM_GET_SIGNATURE, (isok) ? PM3_SUCCESS : PM3_EFLASH, (uint8_t *)info, sizeof(rdv40_validation_t));
             BigBuf_free();
 
             LED_B_OFF();
             break;
         }
+        case CMD_FLASHMEM_GET_INFO: {
+            LED_B_ON();
+            spi_flash_t *spi = flash_get_info();
+            reply_ng(CMD_FLASHMEM_GET_INFO, PM3_SUCCESS, (uint8_t *)spi, sizeof(spi_flash_t));
+            LED_B_OFF();
+            break;
+        }
         case CMD_FLASHMEM_PAGES64K: {
 
             LED_B_ON();

client/resources/pm3_generic_private_key.pem

@@ -0,0 +1,16 @@
+-----BEGIN PRIVATE KEY-----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+-----END PRIVATE KEY-----

client/resources/pm3_generic_private_key.sha512.txt

@@ -0,0 +1 @@
+d99cb37ec1ea04790746a97b439fd3a3dbe5b0eb3de439cdfbf6e7e82ff871d278f11923049fd19e945d90135de112250103850305ed1eca0c82a51a6c5f1682  pm3_generic_private_key.pem