def fdecrypt(filen, password, tweak=0, mode='twofish'):
# reading file in byte mode
f=open(filen,'rb')
smstr=f.read()
f.close()
if mode=='twofish':
psswd=Twofish(password)
decredstr=b''
# decrypting blocks
for x in range(int(len(smstr)/16)):
decredstr+=psswd.decrypt(smstr[x*16:(x+1)*16])
elif mode=='threefish':
psswd=threefish(password,tweak)
decredstr=b''
# decrypting blocks
for x in range(int(len(smstr)/128)):
decredstr+=psswd.decrypt_block(smstr[x*128:(x+1)*128])
return decode(decredstr,'utf-8').strip('%')
