pip install places pycrypto in lowercase 'crypto' on windows.

[Grazfather]

Windows XP SP4, Python 2.7

python -m pip install pycrypto succeeds after installing the compiler, but it fails to load:

>>> from Crypto.Cipher import AES
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named Crypto.Cipher
>>> from crypto.Cipher import AES
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Python27\lib\site-packages\crypto\Cipher\AES.py", line 49, in <module
>
    from Crypto.Cipher import blockalgo
ImportError: No module named Crypto.Cipher

Notice 'crypto' in site-packages is lowercase? Renaming it to 'Crypto' seems to solve the issue.

[alawal123]

From the look of things the pycrypto module is not installed on your system. Try this

https://luiscberrocal.wordpress.com/2012/07/18/installing-and-using-pycrypto-on-windows-7/

or Alternatively open your windows command prompt and set python path first as follows:

set path=%path%;C:\python27

Then on your pycrypto folder hold shift and right click , it will take you to pycrypto file directory in windows command prompt

Then type this command again:

Python setup.py install
or just setup.py install

[Grazfather]

No, it is installed. I verified it exists in site-packages, and like I said, renaming crypto to Crypto solved the issue.

I actually think the issue is the following:

1. I ran pip install crypto (Creates 'crypto' in site-packages)
2. I ran pip install pycrypto (Puts pycrypto in lowercase 'crypto', since the directory already exists)
3. I tried to import Crypto. This failed because presumably python's __import__ checks directories in a case-sensitive way.

I can verify tonight if this is the case. If so, then I think it's a pip issue.

[jomido]

This just occurred to me today. Thanks for posting your solution.

[amremam2004]

under lib/site-packages rename crypto folder to Crypto

[mike-bailey]

Can confirm, this is a bug.

[thecodingchicken]

This is a bug. It is only imported as 'crypto', but it is imported as Crypto in the library's files.

[darouwan]

I ever submitted this issue before, but it was closed by someone...

[mike-bailey]

Sounds like this project is dead

[darouwan]

@mike-bailey yep , the latest release was on four years ago

[askerlee]

You can use pycryptodome, which is a fork of pycrypto and is actively developed. However the same problem exists with this package. Renaming works 😄

[lemenkov]

Dupe of #285

[Mike-Logit]

This has been a real problem for us and very happy to have found this git issue. Any bug fix ETA?

[avrajsri]

pip uninstall crypto
Delete "crypto" Folder [C:\Users\AppData\Local\Programs\Python\Python37\Lib\site-packages]
pip install crypto
pip uninstall pycryptodome
pip install pycryptodome

Rename Folder "crypto" to "Crypto" [C:\Users\AppData\Local\Programs\Python\Python37\Lib\site-packages]

Then You Use "from Crypto.Cipher import AES" in Code

[tina0430]

Thank you, @avrajsri
I solved my issue!

[clintonb]

This is an issue on macOS, too, which may also be case-insensitive.