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doc: python bindings howto

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* Made the changes suggested by Jakub Wilk on gnupg-devel.
* Still need to make the far more comprehensive changes suggested by Justus.
This commit is contained in:
Ben McGinnes 2018-03-17 03:46:02 +11:00
parent 431897a4c4
commit b549f69d05
1 changed files with 54 additions and 69 deletions
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lang/python/docs/GPGMEpythonHOWTOen.org
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@ -13,7 +13,7 @@
:CUSTOM_ID: intro :CUSTOM_ID: intro
:END: :END:
| Version: | 0.1.0 | | Version: | 0.1.0-draft |
| Author: | Ben McGinnes <ben@gnupg.org> | | Author: | Ben McGinnes <ben@gnupg.org> |
| Author GPG Key: | DB4724E6FA4286C92B4E55C4321E4E2373590E5D | | Author GPG Key: | DB4724E6FA4286C92B4E55C4321E4E2373590E5D |
| Language: | Australian English, British English | | Language: | Australian English, British English |
@ -159,8 +159,8 @@
The PyME package is available under the same dual licensing as The PyME package is available under the same dual licensing as
GPGME itself: the GNU General Public License version 2.0 (or any GPGME itself: the GNU General Public License version 2.0 (or any
later version) and the GNU Lesser Public License version 2.1 (or later version) and the GNU Lesser General Public License version
any later version). 2.1 (or any later version).
* GPGME Python bindings installation * GPGME Python bindings installation
@ -275,7 +275,7 @@
that most operations require more than one instruction to the API that most operations require more than one instruction to the API
to perform the task. Sure, there are certain functions which can to perform the task. Sure, there are certain functions which can
be performed simultaneously, particularly if the result known or be performed simultaneously, particularly if the result known or
strongly anticipated (e.g selecting and encrypting to a key known strongly anticipated (e.g. selecting and encrypting to a key known
to be in the public keybox). to be in the public keybox).
There are many more, however, which cannot be manipulated so There are many more, however, which cannot be manipulated so
@ -505,11 +505,8 @@
try: try:
c.op_encrypt([r], 1, plain, cipher) c.op_encrypt([r], 1, plain, cipher)
cipher.seek(0, os.SEEK_SET) cipher.seek(0, os.SEEK_SET)
del(text) with open("secret_plans.txt.asc", "wb") as afile:
del(plain) afile.write(cipher.read())
afile = open("secret_plans.txt.asc", "wb")
afile.write(cipher.read())
afile.close()
except gpg.errors.GPGMEError as ex: except gpg.errors.GPGMEError as ex:
print(ex.getstring()) print(ex.getstring())
#+end_src #+end_src
@ -555,9 +552,8 @@
cipher = c.encrypt(text, recipients=logrus, sign=False, always_trust=True) cipher = c.encrypt(text, recipients=logrus, sign=False, always_trust=True)
afile = open("secret_plans.txt.asc", "wb") with open("secret_plans.txt.asc", "wb") as afile:
afile.write(cipher[0]) afile.write(cipher[0])
afile.close()
#+end_src #+end_src
All it would take to change the above example to sign the message All it would take to change the above example to sign the message
@ -582,9 +578,8 @@
#+begin_src python #+begin_src python
import gpg import gpg
afile = open("secret_plans.txt", "rb") with open("secret_plans.txt.asc", "rb") as afile:
text = afile.read() text = afile.read()
afile.close()
c = gpg.Context(armor=True) c = gpg.Context(armor=True)
rpattern = list(c.keylist(pattern="@gnupg.org", secret=False)) rpattern = list(c.keylist(pattern="@gnupg.org", secret=False))
@ -608,9 +603,8 @@
except: except:
pass pass
afile = open("secret_plans.txt.asc", "wb") with open("secret_plans.txt.asc", "wb") as afile:
afile.write(cipher[0]) afile.write(cipher[0])
afile.close()
#+end_src #+end_src
This will attempt to encrypt to all the keys searched for, then This will attempt to encrypt to all the keys searched for, then
@ -648,9 +642,8 @@
cipher = c.encrypt(text, recipients=logrus, sign=False, always_trust=True) cipher = c.encrypt(text, recipients=logrus, sign=False, always_trust=True)
afile = open("secret_plans.txt.asc", "wb") with open("secret_plans.txt.asc", "wb") as afile:
afile.write(cipher[0]) afile.write(cipher[0])
afile.close()
#+end_src #+end_src
With one or two exceptions, this method will probably prove to be With one or two exceptions, this method will probably prove to be
@ -677,9 +670,8 @@
cipher = c.encrypt(text, recipients=logrus, sign=False, always_trust=True) cipher = c.encrypt(text, recipients=logrus, sign=False, always_trust=True)
afile = open("secret_plans.txt.asc", "wb") with open("secret_plans.txt.asc", "wb") as afile:
afile.write(cipher[0]) afile.write(cipher[0])
afile.close()
#+end_src #+end_src
@ -718,7 +710,6 @@
print(plaintext[0]) print(plaintext[0])
plaintext[1] plaintext[1]
plaintext[2] plaintext[2]
del(plaintext)
else: else:
pass pass
#+end_src #+end_src
@ -793,15 +784,14 @@
text0 = """Declaration of ... something. text0 = """Declaration of ... something.
""" """
text = text0.encode("utf-8") text = text0.encode()
c = gpg.Context(armor=True, signers=sig_src) c = gpg.Context(armor=True, signers=sig_src)
signed = c.sign(text, mode=0) signed = c.sign(text, mode=0)
afile = open("/path/to/statement.txt.asc", "w") with open("/path/to/statement.txt.asc", "w") as afile:
for line in signed[0]: for line in signed[0]:
afile.write("{0}\n".format(line.decode("utf-8"))) afile.write("{0}\n".format(line.decode()))
afile.close()
#+end_src #+end_src
Though everything in this example is accurate, it is more likely Though everything in this example is accurate, it is more likely
@ -812,16 +802,14 @@
#+begin_src python #+begin_src python
import gpg import gpg
tfile = open("/path/to/statement.txt", "rb") with open("/path/to/statement.txt", "rb") as tfile:
text = tfile.read() text = tfile.read()
tfile.close()
c = gpg.Context() c = gpg.Context()
signed = c.sign(text, mode=0) signed = c.sign(text, mode=0)
afile = open("/path/to/statement.txt.sig", "wb") with open("/path/to/statement.txt.sig", "wb") as afile:
afile.write(signed[0]) afile.write(signed[0])
afile.close()
#+end_src #+end_src
*** Detached signing messages and files *** Detached signing messages and files
@ -840,15 +828,14 @@
text0 = """Declaration of ... something. text0 = """Declaration of ... something.
""" """
text = text0.encode("utf-8") text = text0.encode()
c = gpg.Context(armor=True) c = gpg.Context(armor=True)
signed = c.sign(text, mode=1) signed = c.sign(text, mode=1)
afile = open("/path/to/statement.txt.asc", "w") with open("/path/to/statement.txt.asc", "w") as afile:
for line in signed[0].splitlines(): for line in signed[0].splitlines():
afile.write("{0}\n".format(line.decode("utf-8"))) afile.write("{0}\n".format(line.decode()))
afile.close()
#+end_src #+end_src
As with normal signatures, detached signatures are best handled as As with normal signatures, detached signatures are best handled as
@ -857,16 +844,14 @@
#+begin_src python #+begin_src python
import gpg import gpg
tfile = open("/path/to/statement.txt", "rb") with open("/path/to/statement.txt", "rb") as tfile:
text = tfile.read() text = tfile.read()
tfile.close()
c = gpg.Context(signers=sig_src) c = gpg.Context(signers=sig_src)
signed = c.sign(text, mode=1) signed = c.sign(text, mode=1)
afile = open("/path/to/statement.txt.sig", "wb") with open("/path/to/statement.txt.sig", "wb") as afile:
afile.write(signed[0]) afile.write(signed[0])
afile.close()
#+end_src #+end_src
*** Clearsigning messages or text *** Clearsigning messages or text
@ -885,15 +870,14 @@
text0 = """Declaration of ... something. text0 = """Declaration of ... something.
""" """
text = text0.encode("utf-8") text = text0.encode()
c = gpg.Context() c = gpg.Context()
signed = c.sign(text, mode=2) signed = c.sign(text, mode=2)
afile = open("/path/to/statement.txt.asc", "w") with open("/path/to/statement.txt.asc", "w") as afile:
for line in signed[0].splitlines(): for line in signed[0].splitlines():
afile.write("{0}\n".format(line.decode("utf-8"))) afile.write("{0}\n".format(line.decode()))
afile.close()
#+end_src #+end_src
In spite of the appearance of a clear-signed message, the data In spite of the appearance of a clear-signed message, the data
@ -902,16 +886,14 @@
#+begin_src python #+begin_src python
import gpg import gpg
tfile = open("/path/to/statement.txt", "rb") with open("/path/to/statement.txt", "rb") as tfile:
text = tfile.read() text = tfile.read()
tfile.close()
c = gpg.Context() c = gpg.Context()
signed = c.sign(text, mode=2) signed = c.sign(text, mode=2)
afile = open("/path/to/statement.txt.asc", "wb") with open("/path/to/statement.txt.asc", "wb") as afile:
afile.write(signed[0]) afile.write(signed[0])
afile.close()
#+end_src #+end_src
@ -1131,7 +1113,7 @@
c = gpg.Context() c = gpg.Context()
c.home_dir = "/tmp/dmgpg" c.home_dir = "~/.gnupg-dm"
userid = "Danger Mouse <dm@secret.example.net>" userid = "Danger Mouse <dm@secret.example.net>"
dmkey = c.create_key(userid, algorithm = "rsa3072", expires_in = 31536000, dmkey = c.create_key(userid, algorithm = "rsa3072", expires_in = 31536000,
@ -1142,7 +1124,10 @@
parameter. This enables generating the key or keys in a different parameter. This enables generating the key or keys in a different
location. In this case to keep the new key data created for this location. In this case to keep the new key data created for this
example in a separate location rather than adding it to existing example in a separate location rather than adding it to existing
and active key store data. and active key store data. As with the default directory,
=~/.gnupg=, any temporary or separate directory needs the
permissions set to only permit access by the directory owner. On
posix systems this means setting the directory permissions to 700.
The successful generation of the key can be confirmed via the The successful generation of the key can be confirmed via the
returned =GenkeyResult= object, which includes the following data: returned =GenkeyResult= object, which includes the following data:
@ -1163,8 +1148,8 @@
line program: line program:
#+begin_src shell #+begin_src shell
bash-4.4$ gpg --homedir /tmp/dmgpg -K bash-4.4$ gpg --homedir ~/.gnupg-dm -K
/tmp/dmgpg/pubring.kbx ~/.gnupg-dm/pubring.kbx
---------------------- ----------------------
sec rsa3072 2018-03-15 [SC] [expires: 2019-03-15] sec rsa3072 2018-03-15 [SC] [expires: 2019-03-15]
177B7C25DB99745EE2EE13ED026D2F19E99E63AA 177B7C25DB99745EE2EE13ED026D2F19E99E63AA
@ -1180,7 +1165,7 @@
my own =gpg.conf= file in order to be able to generate this: my own =gpg.conf= file in order to be able to generate this:
#+begin_src shell #+begin_src shell
bash-4.4$ gpg --homedir /tmp/dmgpg --edit-key 177B7C25DB99745EE2EE13ED026D2F19E99E63AA showpref quit bash-4.4$ gpg --homedir ~/.gnupg-dm --edit-key 177B7C25DB99745EE2EE13ED026D2F19E99E63AA showpref quit
Secret key is available. Secret key is available.
sec rsa3072/026D2F19E99E63AA sec rsa3072/026D2F19E99E63AA
@ -1218,7 +1203,7 @@
import gpg import gpg
c = gpg.Context() c = gpg.Context()
c.home_dir = "/tmp/dmgpg" c.home_dir = "~/.gnupg-dm"
key = c.get_key(dmkey.fpr, secret = True) key = c.get_key(dmkey.fpr, secret = True)
dmsub = c.create_subkey(key, algorithm = "rsa3072", expires_in = 15768000, dmsub = c.create_subkey(key, algorithm = "rsa3072", expires_in = 15768000,
@ -1242,8 +1227,8 @@
As well as on the command line with: As well as on the command line with:
#+begin_src shell #+begin_src shell
bash-4.4$ gpg --homedir /tmp/dmgpg -K bash-4.4$ gpg --homedir ~/.gnupg-dm -K
/tmp/dmgpg/pubring.kbx ~/.gnupg-dm/pubring.kbx
---------------------- ----------------------
sec rsa3072 2018-03-15 [SC] [expires: 2019-03-15] sec rsa3072 2018-03-15 [SC] [expires: 2019-03-15]
177B7C25DB99745EE2EE13ED026D2F19E99E63AA 177B7C25DB99745EE2EE13ED026D2F19E99E63AA
@ -1268,7 +1253,7 @@
import gpg import gpg
c = gpg.Context() c = gpg.Context()
c.home_dir = "/tmp/dmgpg" c.home_dir = "~/.gnupg-dm"
dmfpr = "177B7C25DB99745EE2EE13ED026D2F19E99E63AA" dmfpr = "177B7C25DB99745EE2EE13ED026D2F19E99E63AA"
key = c.get_key(dmfpr, secret = True) key = c.get_key(dmfpr, secret = True)
@ -1280,8 +1265,8 @@
Unsurprisingly the result of this is: Unsurprisingly the result of this is:
#+begin_src shell #+begin_src shell
bash-4.4$ gpg --homedir /tmp/dmgpg -K bash-4.4$ gpg --homedir ~/.gnupg-dm -K
/tmp/dmgpg/pubring.kbx ~/.gnupg-dm/pubring.kbx
---------------------- ----------------------
sec rsa3072 2018-03-15 [SC] [expires: 2019-03-15] sec rsa3072 2018-03-15 [SC] [expires: 2019-03-15]
177B7C25DB99745EE2EE13ED026D2F19E99E63AA 177B7C25DB99745EE2EE13ED026D2F19E99E63AA