Issues with getting fastecdsa working in Windows

There are some issues getting the module working in Windows - I found fixes, but they aren’t very elegant:

The Microsoft Visual C++ Compiler for Python 2.7 package doesn’t seem to support C99 style variables, so I had to move all variable declarations to the start of functions.
Don’t bother trying to get GMP working on Windows, just use MPIR instead.
If the MPIR library is compiled against a different runtime than fastecdsa (I used VS2015 for compiling MPIR and the previously mentioned VCC for Python 2.7 on fastecdsa), it will mysteriously crash after free()ing the buffer returned from mpz_get_str() - seems to be because memory allocators in different VC runtimes are sometimes incompatible. Changing the free to __gmp_default_free fixed this issue.

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Created 6 years ago
Reactions:2
Comments:27 (7 by maintainers)

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naphy0commented, Jul 9, 2019

You need to have an microsoft visual 2019 and Microsoft c++ in visual studio to run the fastedcsa. You cannot install it without Microsoft c++. after that follow this instruction.

Download https://github.com/ChillMagic/MPIR-Binary
Download https://github.com/AntonKueltz/fastecdsa
rename mpir.h to gmp.h from MPIR-Binary-master\include and rename mpir.lib to gmp.lib from MPIR-Binary-master\lib\MD\x64\Release
Copy and paste gmp.lib C:\Program Files (x86)\Microsoft Visual Studio\2019\BuildTools\VC\Tools\MSVC\14.21.27702\lib\x64
Copy and paste gmp.h C:\Phyton3\include
I don’t remember if I do this ( just put mpir.dll from MPIR-Binary-master\dll\x64\Release in to the directory of package, C:\Python37\Lib\site-packages\fastecdsa ) Do it last if you have error. if not working try to rename it again to gmp.dll But I guess it’s not needed to install fastedcsa.
Open CMD and cd to where you put your fastecdsa E:\Download\fastecdsa-master
when your cmd is in the directory type: python setup.py build
after installation type again: python setup.py install
Good Luck treasure hunting.

1reaction

PaulGregorcommented, Feb 7, 2019

Here is somthing interesting - I have not directory of package, .\Lib\site-packages\fastecdsa just egg file in .\Lib\site-packages Different python build/install systems? How to check it? Also, no mpir.dll at my machine at all. Have mpir.lib at MPIR build dir copyed to VC\lib\gmp.lib Attached file is build log from scratch. But, from working machine, were exist working fastecdsa pack build.log

You can just copy fastecdsa from egg directory to site-packages. Also I dont know about python 2.7. I’ve tested on 3+ only. My steps were: copy gmp.h to C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\include copy mpir.lib to package directory, it could be C:\Python37\Lib\site-packages\fastecdsa or C:\Python37\Lib\site-packages\fastecdsa-1.6.5-py3.7-win-amd64.egg\fastecdsa