base64.py

table="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"

def base64_encode64(str):
	add=3-len(str)%3
	if(add!=3):
		str+=add*'\x00'

	bits="".join(format(x,'08b') for x in bytearray(str))
	list=[]
	for i in xrange(0,len(bits),6):
		list.append(int(bits[i:i+6],2))

	ret="".join(map(lambda i:table[i],list))
	if(add!=3):
		ret=ret[:-add]+'='*add
	return ret

def base64_decode64(str):
	bits="".join(format(x,'06b') for x in bytearray(map(lambda i:table.index(i),str.replace('=',''))))
	list=[]
	for i in xrange(0,len(bits),8):
		list.append(chr(int(bits[i:i+8],2)))
	return "".join(list).replace('\x00','')