I have found two mistakes in stickynotes.py, but I have installed old
Crypto module which has slightly different way of encrypting/decrypting.
The first one is that it refuses to create encrypted stickynote from empty
node which is, according to the documentation, proper way to create
encrypted stycky note.
@g.command('stickynoteenc')
def stickynoteenc_f(event, rekey=False):
""" Launch editable 'sticky note' for the encrypted node """
if not encOK:
g.es('no en/decryption - need python-crypto module')
return
if not __ENCKEY[0] or rekey:
sn_getenckey()
c = event['c']
p = c.p
v = p.v
def focusin():
if v is c.p.v:
decoded = sn_decode(v.b)
if decoded is None:
return
if decoded != nf.toPlainText():
# only when needed to avoid scroll jumping
nf.setPlainText(decoded)
nf.setWindowTitle(p.h)
nf.dirty = False
def focusout():
if not nf.dirty:
return
enc = sn_encode(str(nf.toPlainText()))
if v.b != enc:
v.b = enc
v.setDirty()
# Fix #249: Leo and Stickynote plugin do not request to save
c.setChanged(True)
nf.dirty = False
p = c.p
if p.v is v:
c.selectPosition(c.p)
c.redraw()
if rekey:
unsecret = sn_decode(v.b)
if unsecret is None:
return
sn_getenckey()
secret = sn_encode(unsecret)
v.b = secret
// this is new - check if it is old note already encrypted
if v.b:
decoded = sn_decode(v.b)
if decoded is None:
return
else:
// creating new encrypted note
decoded = v.b
nf = mknote(c,p, focusin=focusin, focusout=focusout)
nf.setPlainText(decoded)
if rekey:
g.es("Key updated, data decoded with new key shown in window")
See the red colored code.
The other mistake is in padding string. It is necessary to pad bytes not
unicode strings.
def sn_encode(s): s1 = s.encode('utf8') pad = b' '*(16-len(s1)%16) txta =
AES.new(__ENCKEY[0]).encrypt(s1 + pad) # for old Crypto module # txta =
AES.new(__ENCKEY[0], AES.MODE_EAX).encrypt(s1 + pad) # for pycryptodome txt
= base64.b64encode(txta) txt = str(txt, 'utf-8') wrapped =
textwrap.wrap(txt, break_long_words=True) return '\n'.join(wrapped)
With this two changes it works for me although I get crashes if calling
AES.new as in pycryptodome.
The encryption / decryption itself must be handled separately to check if
we have new or old Crypto module.
The old one doesn't have AES.MODE_EAX.
def get_encoder():
key = __ENCKEY[0]
if hasattr(AES, 'MODE_EAX'):
return AES.new(key, AES.MODE_EAX)
else:
return AES.new(key)
# txt = get_encoder().encrypt(s1 + pad)
# or
# decoded = get_encoder().decrypt(s1)
HTH Vitalije
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