diff --git a/armsrc/iso15693.c b/armsrc/iso15693.c
index e0c3e4436..0c5e7c7ab 100644
--- a/armsrc/iso15693.c
+++ b/armsrc/iso15693.c
@@ -2656,7 +2656,7 @@ void SetTag15693Uid(const uint8_t *uid) {
     switch_off();
 }
 
-static void init_password_15693_Slix(uint8_t *buffer, uint8_t *pwd, const uint8_t *rnd) {
+static void init_password_15693_Slix(uint8_t *buffer, const uint8_t *pwd, const uint8_t *rnd) {
     memcpy(buffer, pwd, 4);
     if (rnd) {
         buffer[0] ^= rnd[0];
@@ -2684,7 +2684,7 @@ static bool get_rnd_15693_Slix(uint32_t start_time, uint32_t *eof_time, uint8_t
     return true;
 }
 
-static uint32_t disable_privacy_15693_Slix(uint32_t start_time, uint32_t *eof_time, uint8_t pass_id, uint8_t *password) {
+static uint32_t disable_privacy_15693_Slix(uint32_t start_time, uint32_t *eof_time, uint8_t pass_id, const uint8_t *password) {
 
     uint8_t rnd[2];
     if (get_rnd_15693_Slix(start_time, eof_time, rnd) == false) {
@@ -2706,7 +2706,7 @@ static uint32_t disable_privacy_15693_Slix(uint32_t start_time, uint32_t *eof_ti
     return PM3_SUCCESS;
 }
 
-static uint32_t set_pass_15693_Slix(uint32_t start_time, uint32_t *eof_time, uint8_t pass_id, uint8_t *password, uint8_t *uid) {
+static uint32_t set_pass_15693_Slix(uint32_t start_time, uint32_t *eof_time, uint8_t pass_id, const uint8_t *password, uint8_t *uid) {
 
 
     uint8_t rnd[2];
@@ -2733,7 +2733,7 @@ static uint32_t set_pass_15693_Slix(uint32_t start_time, uint32_t *eof_time, uin
     return PM3_SUCCESS;
 }
 
-static uint32_t set_privacy_15693_Slix(uint32_t start_time, uint32_t *eof_time, uint8_t *password) {
+static uint32_t set_privacy_15693_Slix(uint32_t start_time, uint32_t *eof_time, const uint8_t *password) {
     uint8_t rnd[2];
     if (get_rnd_15693_Slix(start_time, eof_time, rnd) == false) {
         return PM3_ETIMEOUT;
@@ -2754,7 +2754,7 @@ static uint32_t set_privacy_15693_Slix(uint32_t start_time, uint32_t *eof_time,
     return PM3_SUCCESS;
 }
 
-static uint32_t disable_eas_15693_Slix(uint32_t start_time, uint32_t *eof_time, uint8_t *password, bool usepwd) {
+static uint32_t disable_eas_15693_Slix(uint32_t start_time, uint32_t *eof_time, const uint8_t *password, bool usepwd) {
 
     uint8_t uid[8];
     get_uid_slix(start_time, eof_time, uid);
@@ -2788,7 +2788,7 @@ static uint32_t disable_eas_15693_Slix(uint32_t start_time, uint32_t *eof_time,
 }
 
 
-static uint32_t enable_eas_15693_Slix(uint32_t start_time, uint32_t *eof_time, uint8_t *password, bool usepwd) {
+static uint32_t enable_eas_15693_Slix(uint32_t start_time, uint32_t *eof_time, const uint8_t *password, bool usepwd) {
 
     uint8_t uid[8];
     get_uid_slix(start_time, eof_time, uid);
@@ -2820,7 +2820,7 @@ static uint32_t enable_eas_15693_Slix(uint32_t start_time, uint32_t *eof_time, u
     return PM3_SUCCESS;
 }
 
-static uint32_t write_password_15693_Slix(uint32_t start_time, uint32_t *eof_time, uint8_t pwd_id, uint8_t *password, uint8_t *uid) {
+static uint32_t write_password_15693_Slix(uint32_t start_time, uint32_t *eof_time, uint8_t pwd_id, const uint8_t *password, uint8_t *uid) {
 
     uint8_t new_pwd_cmd[] = { (ISO15_REQ_DATARATE_HIGH | ISO15_REQ_ADDRESS), ISO15693_WRITE_PASSWORD, 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, pwd_id, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
 
@@ -2841,7 +2841,7 @@ static uint32_t write_password_15693_Slix(uint32_t start_time, uint32_t *eof_tim
     return PM3_SUCCESS;
 }
 
-static uint32_t pass_protect_EASAFI_15693_Slix(uint32_t start_time, uint32_t *eof_time, bool set_option_flag, uint8_t *password) {
+static uint32_t pass_protect_EASAFI_15693_Slix(uint32_t start_time, uint32_t *eof_time, bool set_option_flag, const uint8_t *password) {
 
     uint8_t flags;
 
@@ -2880,7 +2880,7 @@ static uint32_t pass_protect_EASAFI_15693_Slix(uint32_t start_time, uint32_t *eo
     return PM3_SUCCESS;
 }
 
-static uint32_t write_afi_15693(uint32_t start_time, uint32_t *eof_time, uint8_t *password, bool usepwd, uint8_t *uid, bool use_uid, uint8_t afi) {
+static uint32_t write_afi_15693(uint32_t start_time, uint32_t *eof_time, const uint8_t *password, bool usepwd, uint8_t *uid, bool use_uid, uint8_t afi) {
 
     if (!use_uid) {
         int res_getuid = get_uid_slix(start_time, eof_time, uid);
@@ -2917,7 +2917,7 @@ static uint32_t write_afi_15693(uint32_t start_time, uint32_t *eof_time, uint8_t
 }
 
 /*
-static uint32_t enable_privacy_15693_Slix(uint32_t start_time, uint32_t *eof_time, uint8_t *uid, uint8_t pass_id, uint8_t *password) {
+static uint32_t enable_privacy_15693_Slix(uint32_t start_time, uint32_t *eof_time, uint8_t *uid, uint8_t pass_id, const uint8_t *password) {
     uint8_t rnd[2];
     if (get_rnd_15693_Slix(start_time, eof_time, rnd) == false) {
         return PM3_ETIMEOUT;
@@ -2938,7 +2938,7 @@ static uint32_t enable_privacy_15693_Slix(uint32_t start_time, uint32_t *eof_tim
     return PM3_SUCCESS;
 }
 
-static uint32_t write_password_15693_Slix(uint32_t start_time, uint32_t *eof_time, uint8_t *uid, uint8_t pass_id, uint8_t *password) {
+static uint32_t write_password_15693_Slix(uint32_t start_time, uint32_t *eof_time, uint8_t *uid, uint8_t pass_id, const uint8_t *password) {
     uint8_t rnd[2];
     if (get_rnd_15693_Slix(start_time, eof_time, rnd) == false) {
         return PM3_ETIMEOUT;
@@ -2961,7 +2961,7 @@ static uint32_t write_password_15693_Slix(uint32_t start_time, uint32_t *eof_tim
     return PM3_SUCCESS;
 }
 
-static uint32_t destroy_15693_Slix(uint32_t start_time, uint32_t *eof_time, uint8_t *uid, uint8_t *password) {
+static uint32_t destroy_15693_Slix(uint32_t start_time, uint32_t *eof_time, uint8_t *uid, const uint8_t *password) {
 
     uint8_t rnd[2];
     if (get_rnd_15693_Slix(start_time, eof_time, rnd) == false) {
@@ -2985,7 +2985,7 @@ static uint32_t destroy_15693_Slix(uint32_t start_time, uint32_t *eof_time, uint
 
 */
 
-void WritePasswordSlixIso15693(uint8_t *old_password, uint8_t *new_password, uint8_t pwd_id) {
+void WritePasswordSlixIso15693(const uint8_t *old_password, const uint8_t *new_password, uint8_t pwd_id) {
     LED_D_ON();
     Iso15693InitReader();
     StartCountSspClk();
@@ -3010,7 +3010,7 @@ void WritePasswordSlixIso15693(uint8_t *old_password, uint8_t *new_password, uin
 
 }
 
-void DisablePrivacySlixIso15693(uint8_t *password) {
+void DisablePrivacySlixIso15693(const uint8_t *password) {
     LED_D_ON();
     Iso15693InitReader();
     StartCountSspClk();
@@ -3025,7 +3025,7 @@ void DisablePrivacySlixIso15693(uint8_t *password) {
     switch_off();
 }
 
-void EnablePrivacySlixIso15693(uint8_t *password) {
+void EnablePrivacySlixIso15693(const uint8_t *password) {
     LED_D_ON();
     Iso15693InitReader();
     StartCountSspClk();
@@ -3041,7 +3041,7 @@ void EnablePrivacySlixIso15693(uint8_t *password) {
 }
 
 
-void DisableEAS_AFISlixIso15693(uint8_t *password, bool usepwd) {
+void DisableEAS_AFISlixIso15693(const uint8_t *password, bool usepwd) {
     LED_D_ON();
     Iso15693InitReader();
     StartCountSspClk();
@@ -3059,7 +3059,7 @@ void DisableEAS_AFISlixIso15693(uint8_t *password, bool usepwd) {
     switch_off();
 }
 
-void EnableEAS_AFISlixIso15693(uint8_t *password, bool usepwd) {
+void EnableEAS_AFISlixIso15693(const uint8_t *password, bool usepwd) {
     LED_D_ON();
     Iso15693InitReader();
     StartCountSspClk();
@@ -3074,7 +3074,7 @@ void EnableEAS_AFISlixIso15693(uint8_t *password, bool usepwd) {
     switch_off();
 }
 
-void PassProtextEASSlixIso15693(uint8_t *password) {
+void PassProtextEASSlixIso15693(const uint8_t *password) {
     LED_D_ON();
     Iso15693InitReader();
     StartCountSspClk();
@@ -3083,7 +3083,7 @@ void PassProtextEASSlixIso15693(uint8_t *password) {
     reply_ng(CMD_HF_ISO15693_SLIX_PASS_PROTECT_EAS, res, NULL, 0);
     switch_off();
 }
-void PassProtectAFISlixIso15693(uint8_t *password) {
+void PassProtectAFISlixIso15693(const uint8_t *password) {
     LED_D_ON();
     Iso15693InitReader();
     StartCountSspClk();
@@ -3093,7 +3093,7 @@ void PassProtectAFISlixIso15693(uint8_t *password) {
     switch_off();
 }
 
-void WriteAFIIso15693(uint8_t *password, bool use_pwd, uint8_t *uid, bool use_uid, uint8_t afi) {
+void WriteAFIIso15693(const uint8_t *password, bool use_pwd, uint8_t *uid, bool use_uid, uint8_t afi) {
     LED_D_ON();
     Iso15693InitReader();
     StartCountSspClk();
diff --git a/armsrc/iso15693.h b/armsrc/iso15693.h
index 4644adea9..8a9e2fe82 100644
--- a/armsrc/iso15693.h
+++ b/armsrc/iso15693.h
@@ -60,12 +60,12 @@ int SendDataTagEOF(uint8_t *recv, uint16_t max_recv_len, uint32_t start_time, ui
 
 void SetTag15693Uid(const uint8_t *uid);
 
-void WritePasswordSlixIso15693(uint8_t *old_password, uint8_t *new_password, uint8_t pwd_id);
-void DisablePrivacySlixIso15693(uint8_t *password);
-void EnablePrivacySlixIso15693(uint8_t *password);
-void DisableEAS_AFISlixIso15693(uint8_t *password, bool usepwd);
-void EnableEAS_AFISlixIso15693(uint8_t *password, bool usepwd);
-void PassProtextEASSlixIso15693(uint8_t *password);
-void PassProtectAFISlixIso15693(uint8_t *password);
-void WriteAFIIso15693(uint8_t *password, bool usepwd, uint8_t *uid, bool use_uid, uint8_t afi);
+void WritePasswordSlixIso15693(const uint8_t *old_password, const uint8_t *new_password, uint8_t pwd_id);
+void DisablePrivacySlixIso15693(const uint8_t *password);
+void EnablePrivacySlixIso15693(const uint8_t *password);
+void DisableEAS_AFISlixIso15693(const uint8_t *password, bool usepwd);
+void EnableEAS_AFISlixIso15693(const uint8_t *password, bool usepwd);
+void PassProtextEASSlixIso15693(const uint8_t *password);
+void PassProtectAFISlixIso15693(const uint8_t *password);
+void WriteAFIIso15693(const uint8_t *password, bool usepwd, uint8_t *uid, bool use_uid, uint8_t afi);
 #endif