[pypy-issue] [issue997] PyCrypto fails to build with pypy/cpyext

[Amaury Forgeot d Arc]

Amaury Forgeot d Arc <amauryfa at gmail.com> added the comment:

Unfortunately PyCrypto accesses the internal representation of PyLong objects, which pypy cannot expose.  This part of 
PyCrypto (in _fastmath.c: mpzToLongObj and longObjToMPZ) has to be modified before pypy can compile this module.

Unfortunately the CPython API does not provide many alternatives.  _PyLong_FromByteArray() could be used, but it requires 
an additional copy and would be slower.

The best would be to invent a new CPython API: PyLong_GET_DIGITS() and PyLong_GET_SIZE(), which PyPy could implement like 
the string object and allow a mutable buffer until the object exits the function.

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nosy: +afa
status: unread -> chatting

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