Sending a transfer with an encrypted memo
When the memo key and active key of the sender is know to beem and a # is placed before the memo text, a transfer with an encrypted memo can be sent out. The following script sends a encrypted memo from beembot to holger80.
All scripts in this post need beem to be installed (pip install beem).
#!/usr/bin/python
from beem import Steem
from beem.account import Account
import getpass
if __name__ == "__main__":
account = "beembot"
active_wif = getpass.getpass(prompt='Enter the active key of %s:' % account)
memo_wif = getpass.getpass(prompt='Enter the memo key of %s:' % account)
stm = Steem(node="https://api.steemit.com", keys=[memo_wif, active_wif])
account = Account(account, steem_instance=stm)
account.transfer("holger80", 0.001, "SBD", memo="#This is a test")
Sending was sucessfull:
Decrypting a memo
Lets now try to decrypt the memo. This time we need the memo key of the receiver (memo key of holger80 in the example). We use the Memo object from beem
#!/usr/bin/python
from beem import Steem
from beem.account import Account
from beem.memo import Memo
import getpass
if __name__ == "__main__":
account = "holger80"
memo_wif = getpass.getpass(prompt='Enter the memo key of %s:' % account)
stm = Steem(keys=[memo_wif])
account = Account(account, steem_instance=stm)
memo = Memo(steem_instance=stm)
last_transfer = None
for h in account.history_reverse(only_ops=["transfer"]):
if last_transfer is None and len(h["memo"]) > 2 and h["memo"][0] == '#':
last_transfer = h
break
print(last_transfer)
decrypted_memo = memo.decrypt(last_transfer)
print("Transfer from %s with memo: %s" % (last_transfer["from"], decrypted_memo))
The output of the script is:
Transfer from beembot with memo: This is a test
Encrypting a text
It is also possible to encrypt a text with the memo key using the Memo class of beem. The following script needs the memo key of the holger80 account and ecrypts the memo_text. The encrypted text can only be read with the memo key of account beembot. For encryption, the encrypt function is used. The encrypted text is inside the message field of the returned dict-object.
#!/usr/bin/python
from beem import Steem
from beem.memo import Memo
import getpass
if __name__ == "__main__":
from_account = "holger80"
to_account = "beembot"
memo_text = "test"
if memo_text[0] == '#':
memo_wif = getpass.getpass(prompt='Enter the memo key of %s:' % to_account)
else:
memo_wif = getpass.getpass(prompt='Enter the memo key of %s:' % from_account)
stm = Steem(keys=[memo_wif])
memo = Memo(from_account=from_account, to_account=to_account, steem_instance=stm)
if memo_text[0] == '#':
print(memo.decrypt(memo_text))
else:
print(memo.encrypt(memo_text)["message"])
The encrypted text is:
#DTpKcbxWqsETCRfjYGk9feERFa5nVBF8FaHfWPwUjyHBTdwW8WCPrVPATsAm7WwF6WZ9XaVAutUVZLsGEpkLfh7d4RNQhFBryKUzKGCqGUTp7QKmu2Qk6qKqWB3aTfetp
Every run creates a different string:
#DTpKcbxWqsETCRfjYGk9feERFa5nVBF8FaHfWPwUjyHBTdwW8WCPrVPATsAm7WwF6WZ9XaVAutUVZLsGEpkLfh7d4PXbUsoGhDzxfDe6q4E72rfsiKXFHQhPzjAJsQpne
3 run:
#DTpKcbxWqsETCRfjYGk9feERFa5nVBF8FaHfWPwUjyHBTdwW8WCPrVPATsAm7WwF6WZ9XaVAutUVZLsGEpkLfh7d4KDdkySsJHTNULByLkK6yWrmoZQWBgV8yubm2TjG4
Decrypting a text
Decrypting is also possible, when the memo key of the receiver is known to beem. The following script decrypt the encrypted text using the memo key of account beembot. This time the decrypt function is used.
#!/usr/bin/python
from beem import Steem
from beem.memo import Memo
import getpass
if __name__ == "__main__":
from_account = "holger80"
to_account = "beembot"
memo_text = "#DTpKcbxWqsETCRfjYGk9feERFa5nVBF8FaHfWPwUjyHBTdwW8WCPrVPATsAm7WwF6WZ9XaVAutUVZLsGEpkLfh7d4RNQhFBryKUzKGCqGUTp7QKmu2Qk6qKqWB3aTfetp"
if memo_text[0] == '#':
memo_wif = getpass.getpass(prompt='Enter the memo key of %s:' % to_account)
else:
memo_wif = getpass.getpass(prompt='Enter the memo key of %s:' % from_account)
stm = Steem(keys=[memo_wif])
memo = Memo(from_account=from_account, to_account=to_account, steem_instance=stm)
if memo_text[0] == '#':
print(memo.decrypt(memo_text))
else:
print(memo.encrypt(memo_text)["message"])
All three encrypted memo texts give back the following string:
test
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