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M2Crypto RSA.gen_key - feed a password from Python code


M2Crypto RSA.gen_key - feed a password from Python code

By : Ganesan Mani
Date : November 19 2020, 07:01 PM
I hope this helps you . The only time it asks for a password is if you try to save a key and you choose to use a cipher. Just pass "cipher=None" as an argument.
For example:
code :


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How can I load a password-protected private key from a .pem file with M2Crypto?

How can I load a password-protected private key from a .pem file with M2Crypto?


By : Alaa Pro
Date : March 29 2020, 07:55 AM
this will help This is due to the lack of parameter support in your callback function. As it will be called with at least one parameter, a TypeError exception will occurred (which is catched by M2Crypto).
code :
>>> def gimmepw(*args):
...     print 'args:', repr(args)
...     return 'test'
... 
>>> M2Crypto.RSA.load_key('key.pem', gimmepw)
args: (0,)
<M2Crypto.RSA.RSA instance at 0xb6e8050c>
def gimmepw(*args):
    return 'mysecret'
Is there a way to suppress Python M2Crypto's RSA.gen_key output?

Is there a way to suppress Python M2Crypto's RSA.gen_key output?


By : Prince
Date : March 29 2020, 07:55 AM
will be helpful for those in need I looked at the source /M2Crypto/RSA.py, found out what your issue was, and then realized I could have just read the docs. Always check the documentation first!!!
According to the docs for RSA.gen_key, gen_key has an optional argument called callback which allows you to specify a function to call whenever gen_key is called (ostensibly to provide feedback to the user). The default value for this call back prints stuff to stdout. Change your function call to:
code :
>>> rsa = M2Crypto.RSA.gen_key (2048, 65537, callback=lambda x, y, z:None) 
def keygen_callback(p, n, out=sys.stdout): #sys.stdout is bound to `out` at definition time
    """
    Default callback for gen_key().
    """
    ch = ['.','+','*','\n']
    out.write(ch[p])
    out.flush()


def gen_key(bits, e, callback=keygen_callback): #keygen_callback is bound to `callback`
    #other code...
Porting AES code from M2Crypto to pycrypto

Porting AES code from M2Crypto to pycrypto


By : Krishna
Date : March 29 2020, 07:55 AM
it fixes the issue You will have to implement PKCS#7 padding/unpadding, which is kind of simple and specified in the publicly available standard from RSA labs, and of course on Wikipedia. Also see this answer:
AES 256 Encryption with PyCrypto using CBC mode - any weaknesses?
Python M2Crypto EC Support

Python M2Crypto EC Support


By : user3771076
Date : March 29 2020, 07:55 AM
help you fix your problem Some Linux distros, for example Fedora and Redhat, disable EC due to patent concerns.
If you build OpenSSL yourself, there are a few options you may need to specify for build_ext in addition to --openssl: --library-dirs and --include-dirs. See for example the m2crypto Makefile in Chandler. Also the M2Crypto FAQ has an answer for this.
_shutdown AttributeError (ignored) when linting code that uses M2Crypto

_shutdown AttributeError (ignored) when linting code that uses M2Crypto


By : Canete Lea
Date : March 29 2020, 07:55 AM
hope this fix your issue The exception that you are seeing is caused by a bug in the astng package (presumably “Abstract Syntax Tree, Next Generation”?) which is a toolkit on which pylint depends, written by the same people. I should note in passing that I always encourage people to use pyflakes instead of pylint when possible, because it is quick, simple, fast, and predictable, whereas pylint tries to do several kinds of deep magic that are not only slow but that can get it into exactly this kind of trouble. :)
Here are the two packages on PyPI:
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