diff --git a/common/wiegand.c b/common/wiegand.c
new file mode 100644
index 000000000..c9d5fbed1
--- /dev/null
+++ b/common/wiegand.c
@@ -0,0 +1,231 @@
+//-----------------------------------------------------------------------------
+// This code is licensed to you under the terms of the GNU GPL, version 2 or,
+// at your option, any later version. See the LICENSE.txt file for the text of
+// the license.
+//-----------------------------------------------------------------------------
+// Wiegand functions
+//-----------------------------------------------------------------------------
+
+#include "wiegand.h"
+
+/*
+* @brief getParity
+* @param bits     pointer to the source bitstream of binary values 0|1
+* @param len      how long shall parity be calculated
+* @param type     use the defined values  EVEN|ODD
+* @return parity bit required to match type
+*/
+uint8_t getParity( uint8_t *bits, uint8_t len, uint8_t type ) {
+    uint8_t x = 0;
+    for(; len > 0; --len) 
+        x += bits[len - 1];
+
+    return (x & 1 ) ^ type;
+}
+
+// by marshmellow
+/* pass bits to be tested in bits, length bits passed in bitLen, and parity type EVEN|ODD in type
+* @brief checkParity
+* @param bits     pointer to the source bitstream of binary values 0|1
+* @param len      number of bits to be checked
+* @param type     use the defined values  EVEN|ODD
+* @return 1 if passed
+*/
+uint8_t checkParity(uint32_t bits, uint8_t len, uint8_t type);
+
+// by marshmellow
+// takes a array of binary values, start position, length of bits per parity (includes parity bit),
+// Parity Type (1 for odd; 0 for even; 2 for Always 1's; 3 for Always 0's), and binary Length (length to run) 
+size_t removeParity(uint8_t *bitstream, size_t startIdx, uint8_t pLen, uint8_t pType, size_t bLen) {
+	uint32_t parityWd = 0;
+	size_t j = 0, bitcount = 0;
+	for (int word = 0; word < (bLen); word += pLen){
+		for (int bit = 0; bit < pLen; ++bit){
+			parityWd = (parityWd << 1) | bitstream[startIdx+word+bit];
+			bitstream[j++] = (bitstream[startIdx + word + bit]);
+		}
+		j--; // overwrite parity with next data
+		// if parity fails then return 0
+		switch (pType) {
+			case 3: if (bitstream[j] == 1) return 0; break; //should be 0 spacer bit
+			case 2: if (bitstream[j] == 0) return 0; break; //should be 1 spacer bit
+			default: //test parity
+				if (parityTest(parityWd, pLen, pType) == 0) return 0; break;
+		}
+		bitcount += ( pLen - 1 );
+		parityWd = 0;
+	}
+	// if we got here then all the parities passed
+	//return ID start index and size
+	return bitcount;
+}
+
+
+// by marshmellow
+// takes a array of binary values, length of bits per parity (includes parity bit),
+// Parity Type (1 for odd; 0 for even; 2 Always 1's; 3 Always 0's), and binary Length (length to run)
+// Make sure *dest is long enough to store original sourceLen + #_of_parities_to_be_added
+/*
+* @brief addParity
+* @param bits       pointer to the source bitstream of binary values
+* @param dest       pointer to the destination where parities together with bits are added.
+* @param sourceLen  number of 
+* @param pLen       length bits to be checked
+* @param pType      EVEN|ODD|2 (always 1's)|3 (always 0's)
+* @return 
+*/
+size_t addParity(uint8_t *bits, uint8_t *dest, uint8_t sourceLen, uint8_t pLen, uint8_t pType)
+{
+	uint32_t parityWd = 0;
+	size_t j = 0, bitCnt = 0;
+	for (int word = 0; word < sourceLen; word += pLen-1) {
+		for (int bit = 0; bit < pLen-1; ++bit){
+			parityWd = (parityWd << 1) | bits[word+bit];
+			dest[j++] = (bits[word+bit]);
+		}
+		
+		// if parity fails then return 0
+		switch (pType) {
+			case 3: dest[j++] = 0; break; // marker bit which should be a 0
+			case 2: dest[j++] = 1; break; // marker bit which should be a 1
+			default: 
+				dest[j++] = parityTest(parityWd, pLen-1, pType) ^ 1;
+				break;
+		}
+		bitCnt += pLen;
+		parityWd = 0;
+	}
+	// if we got here then all the parities passed
+	//return ID start index and size
+	return bitCnt;
+}
+
+// by marshmellow
+/*
+*  add HID parity to binary array: EVEN prefix for 1st half of ID, ODD suffix for 2nd half
+* @brief wiegand_add_parity
+* @param source  pointer to source of binary data
+* @param dest    pointer to the destination where wiegandparity has been appended
+* @param len     number of bits which wiegand parity shall be calculated over. This number is without parities, so a wiegand 26 has 24 bits of data
+*/
+void wiegand_add_parity(uint8_t *source, uint8_t *dest, uint8_t len) {
+
+	// Copy to destination, shifted one step to make room for EVEN parity
+    memcpy(dest+1, source, length);
+
+	// half length, Even and Odd is calculated to the middle.
+	uint8_t len_h2 = length >> 1;
+	
+	// add EVEN parity at the beginning
+    *(dest) = GetParity(source, EVEN, len_h2);
+	
+    dest += length + 1;
+	
+	// add ODD parity at the very end
+    *(dest) = GetParity(source + len_h2, ODD, len_h2);
+}
+
+//uint32_t bytebits_to_byte(uint8_t* src, size_t numbits);
+#define MAX_BITS_TXX55 6*4*8
+#define MAX_BYTES_TXX55 6*4	
+/*
+* @brief num_to_wiegand_bytes
+* @param oem       Sometimes call FF Fixfield, SiteCode. Used in a few formats
+* @param fc        Facility code 
+* @param cn        Card number
+* @param dest      pointer to the destination where wiegand bytes will be stored
+* @param formatlen 
+*/
+void num_to_wiegand_bytes(uint64_t oem, uint64_t fc, uint64_t cn, uint8_t *dest, uint8_t formatlen){
+
+	uint8_t data[MAX_BITS_TXX55] = {0};
+	memset(data, 0, sizeof(data));
+	
+	num_to_wiegand_bits(oem, fc, cn, data, formatlen);
+		
+	// loop
+	// (formatlen / 32 ) + 1
+	// (formatlen >> 5) + 1
+	for (int i = 0; i < formatlen ; ++i){
+		uint32_t value  = bytebits_to_byte( data + (i * 32), 32);
+		num_to_bytes(value, 32, dest + (i*4) );
+	}
+	
+}
+/*
+* @brief num_to_wiegand_bits
+* @param oem       Sometimes call FF Fixfield, SiteCode. Used in a few formats
+* @param fc        Facility code 
+* @param cn        Card number
+* @param dest      pointer to the destination where wiegand bits will be stored
+* @param formatlen 
+*/
+void num_to_wiegand_bits(uint64_t oem, uint64_t fc, uint64_t cn, uint8_t *dest, uint8_t formatlen){
+
+	uint8_t bits[MAX_BITS_TXX55] = {0};
+	memset(bits, 0, sizeof(bits));
+	uint8_t *temp = bits;
+	uint64_t value = 0;
+	
+	switch ( formatlen ){		
+		case 26 :				// 26bit HID H10301
+			fc &= 0xFF;			// 8bits
+			cn &= 0xFFFF;		// 16bits
+			value = fc << 16 | cn;
+			num_to_bytebits(value, 24, temp);
+			wiegand_add_parity(temp, dest, 24);
+			break;
+		case 261:				// 26bit Indala 
+			fc &= 0xFFF;		// 12bits
+			cn &= 0xFFF;		// 12bits
+			value = fc << 12 | cn;
+			num_to_bytebits(value, 24, temp);
+			wiegand_add_parity(temp, dest, 24);	
+			break;
+		case 34 :				// 34bits HID
+			fc &= 0xFFFF;		// 16bits
+			cn &= 0xFFFF;		// 16bits
+			value = fc << 16 | cn;
+			num_to_bytebits(value, 32, temp);
+			wiegand_add_parity(temp, dest, 32);	
+			break;
+		case 35 :				// 35bits HID
+			fc &= 0xFFF;		// 12bits
+			cn &= 0xFFFFFF;		// 20bits
+			value = fc << 20 | cn;
+			num_to_bytebits(value, 32, temp);
+			wiegand_add_parity(temp, dest, 32);	
+			break;
+		case 37 : 				// H10304
+			fc &= 0xFFFF;   	// 16bits
+			cn &= 0x7FFFF;  	// 19bits
+			value = fc << 19 | cn;
+			num_to_bytebits(value, 35, temp);
+			wiegand_add_parity(temp, dest, 35);
+			break;
+		case 39 :				// 39bit KERI System Pyramid
+			fc &= 0x1FFFF;		// 17bits
+			cn &= 0xFFFFFFFF;	// 20bits
+			value = fc << 20 | cn;
+			num_to_bytebits(value, 37, temp);
+			wiegand_add_parity(temp, dest, 37);
+			break;
+		case 44 :				// 44bit KERI system Pyramid
+			oem &= 0xFF;		// 8bits
+			fc &= 0xFFF;		// 12bits
+			cn &= 0xFFFFFFFF;	// 21bits
+			value = oem << 20 | fc << 12 | cn;
+			num_to_bytebits(value, 42, temp);
+			wiegand_add_parity(temp, dest, 42);
+			break;
+		case 50 :				// AWID 50 RBH
+			fc &= 0xFFFF;		// 16bits
+			cn &= 0xFFFFFFFF	// 32bits
+			value = fc << 32 | cn;
+			num_to_bytebits(value, 48, temp);
+			wiegand_add_parity(temp, dest, 48);  // verify!
+			break;
+		default:
+			break;
+	}
+}
\ No newline at end of file
diff --git a/common/wiegand.h b/common/wiegand.h
new file mode 100644
index 000000000..b9a5770cf
--- /dev/null
+++ b/common/wiegand.h
@@ -0,0 +1,21 @@
+//-----------------------------------------------------------------------------
+// This code is licensed to you under the terms of the GNU GPL, version 2 or,
+// at your option, any later version. See the LICENSE.txt file for the text of
+// the license.
+//-----------------------------------------------------------------------------
+// Generic Wiegand Calculation code
+//-----------------------------------------------------------------------------
+
+#ifndef __WIEGAND_H
+#define __WIEGAND_H
+
+#include "common.h"
+#include "util.h"
+
+uint8_t getParity( uint8_t *bits, uint8_t length, uint8_t type);
+uint8_t checkParity(uint32_t bits, uint8_t bitlen, uint8_t type);
+
+void num_to_wiegand_bytes(uint64_t oem, uint64_t fc, uint64_t cn, uint8_t *dest, uint8_t formatlen);
+void num_to_wiegand_bits(uint64_t oem, uint64_t fc, uint64_t cn, uint8_t *dest, uint8_t formatlen);
+
+#endif /* __WIEGAND_H */