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_pkcs11.pyx: Fix Python int too large to convert to C ssize_t #201

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_pkcs11.pyx: Fix Python int too large to convert to C ssize_t #201

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3 changes: 3 additions & 0 deletions pkcs11/_pkcs11.pyx
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Original file line number Diff line number Diff line change
Expand Up @@ -731,6 +731,7 @@ class Object(types.Object):
cdef CK_SESSION_HANDLE handle = self.session._handle
cdef CK_OBJECT_HANDLE obj = self._handle
cdef CK_ATTRIBUTE template
cdef CK_ULONG CK_UNAVAILABLE_INFORMATION = (<CK_ULONG> (~0))

template.type = key
template.pValue = NULL
Expand All @@ -740,6 +741,8 @@ class Object(types.Object):
with nogil:
assertRV(_funclist.C_GetAttributeValue(handle, obj, &template, 1))

if template.ulValueLen >= CK_UNAVAILABLE_INFORMATION:
return _unpack_attributes(key, b'0')
if template.ulValueLen == 0:
return _unpack_attributes(key, b'')

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