hex2base64.py

def hex2bytes(hex_string):
	bytes = bytearray()
	for i in range(0,len(hex_string),2):
		bytes.append( int(data[i:i+2],16) )
	return bytes

def conv_chunk( chunk, i = 0, max = 4 ):
	charset = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
	return conv_chunk(chunk>>6,i+1,max)+(charset[(chunk)&0x3F]) if i < max else ''
	
def bytes2base64(bytes):
	base64_string = ''	
	num_sections = len(bytes)/3
	int_val = 0
	for i in range(0,num_sections):
		int_val = (bytes[0]<<16) + (bytes[1]<<8) + bytes[2]
		base64_string += conv_chunk(int_val)	
		bytes = bytes[3:]

	bytes_left = len(bytes)%3
	if bytes_left > 0 :
		int_val =  bytes[0]<<4 if bytes_left==1 else (bytes[0]<<10)+(bytes[1]<<2)
		base64_string += conv_chunk(int_val,max=bytes_left+1)+('='*(3-bytes_left))

	return base64_string