diff --git a/examples/AirQualitySensor/AirQualitySensor.ino b/examples/AirQualitySensor/AirQualitySensor.ino
index 120eebc82..6caac2fca 100644
--- a/examples/AirQualitySensor/AirQualitySensor.ino
+++ b/examples/AirQualitySensor/AirQualitySensor.ino
@@ -214,7 +214,7 @@ Remarks: By using the slope and a point of the line. The x(logarithmic value of
          logarithmic coordinate, power of 10 is used to convert the result to non-logarithmic
          value.
 ************************************************************************************/
-int  MQGetPercentage(float rs_ro_ratio, float *pcurve)
+int  MQGetPercentage(float rs_ro_ratio, const float *pcurve)
 {
 	return (pow(10,( ((log(rs_ro_ratio)-pcurve[1])/pcurve[2]) + pcurve[0])));
 }
diff --git a/examples/SecurityPersonalizer/sha204_library.cpp b/examples/SecurityPersonalizer/sha204_library.cpp
index 0d44cc1b6..0473700d8 100644
--- a/examples/SecurityPersonalizer/sha204_library.cpp
+++ b/examples/SecurityPersonalizer/sha204_library.cpp
@@ -59,7 +59,8 @@ uint8_t atsha204Class::getSerialNumber(uint8_t * response)
 
 /*  Calculates CRC16 value of provided data (and optionally including provided existing CRC16 data)
   returns the calculated CRC16 value */
-uint16_t atsha204Class::calculateAndUpdateCrc(uint8_t length, uint8_t *data, uint16_t current_crc)
+uint16_t atsha204Class::calculateAndUpdateCrc(uint8_t length, const uint8_t *data,
+        uint16_t current_crc)
 {
 	uint8_t counter;
 	uint16_t crc_register = current_crc;
@@ -96,7 +97,7 @@ void atsha204Class::swi_set_signal_pin(uint8_t is_high)
 
 }
 
-uint8_t atsha204Class::swi_send_bytes(uint8_t count, uint8_t *buffer)
+uint8_t atsha204Class::swi_send_bytes(uint8_t count, const uint8_t *buffer)
 {
 	uint8_t i, bit_mask;
 
@@ -707,9 +708,9 @@ uint8_t atsha204Class::sha204m_execute(uint8_t op_code, uint8_t param1, uint16_t
 }
 
 uint8_t atsha204Class::sha204m_check_parameters(uint8_t op_code, uint8_t param1, uint16_t param2,
-        uint8_t datalen1, uint8_t *data1, uint8_t datalen2, uint8_t *data2, uint8_t datalen3,
-        uint8_t *data3,
-        uint8_t tx_size, uint8_t *tx_buffer, uint8_t rx_size, uint8_t *rx_buffer)
+        uint8_t datalen1, const uint8_t *data1, uint8_t datalen2, const uint8_t *data2, uint8_t datalen3,
+        const uint8_t *data3, uint8_t tx_size, const uint8_t *tx_buffer, uint8_t rx_size,
+        const uint8_t *rx_buffer)
 {
 #ifdef SHA204_CHECK_PARAMETERS
 
diff --git a/hal/crypto/generic/drivers/AES/AES.cpp b/hal/crypto/generic/drivers/AES/AES.cpp
index 5f35bb159..d541e31d9 100644
--- a/hal/crypto/generic/drivers/AES/AES.cpp
+++ b/hal/crypto/generic/drivers/AES/AES.cpp
@@ -201,7 +201,7 @@ static void inv_shift_sub_rows (byte st[N_BLOCK])
 
 /* SUB COLUMNS PHASE */
 
-static void mix_sub_columns (byte dt[N_BLOCK], byte st[N_BLOCK])
+static void mix_sub_columns (byte dt[N_BLOCK], const byte st[N_BLOCK])
 {
 	byte j = 5 ;
 	byte k = 10 ;
@@ -223,7 +223,7 @@ static void mix_sub_columns (byte dt[N_BLOCK], byte st[N_BLOCK])
 	}
 }
 
-static void inv_mix_sub_columns (byte dt[N_BLOCK], byte st[N_BLOCK])
+static void inv_mix_sub_columns (byte dt[N_BLOCK], const byte st[N_BLOCK])
 {
 	for (byte i = 0 ; i < N_BLOCK ; i += N_COL) {
 		byte a1 = st [i] ;