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Code Issues Releases Wiki Activity

Handle Microsoft crypt provider without prior keys

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As reported in issue #40, a call to CryptAcquireContext in
SecureRandomDataProvider fails in a fresh windows install prior to any
user keys being created in AppData\Roaming\Microsoft\Crypto\RSA.

Thanks michalrames.
This commit is contained in:
Jay Berkenbilt 2015-05-24 15:41:28 -04:00
parent 857bb208d3
commit cf43882e9f
2 changed files with 37 additions and 2 deletions
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4
ChangeLog
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@ -1,5 +1,9 @@
2015-05-24 Jay Berkenbilt <ejb@ql.org> 2015-05-24 Jay Berkenbilt <ejb@ql.org>
* Handle Microsoft crypt provider initialization properly for case
where no keys have been previously created, such as in a fresh
Windows installation.
* Include time.h in QUtil.hh for time_t * Include time.h in QUtil.hh for time_t
2015-02-21 Jay Berkenbilt <ejb@ql.org> 2015-02-21 Jay Berkenbilt <ejb@ql.org>

35
libqpdf/SecureRandomDataProvider.cc
View File

@ -42,9 +42,40 @@ class WindowsCryptProvider
public: public:
WindowsCryptProvider() WindowsCryptProvider()
{ {
if (! CryptAcquireContext(&crypt_prov, NULL, NULL, PROV_RSA_FULL, 0)) if (!CryptAcquireContext(&crypt_prov,
"Container",
NULL,
PROV_RSA_FULL,
0))
{ {
throw std::runtime_error("unable to acquire crypt context"); #ifdef __GNUC__
# if ((__GNUC__ * 100) + __GNUC_MINOR__) >= 406
# pragma GCC diagnostic push
# pragma GCC diagnostic ignored "-Wold-style-cast"
# pragma GCC diagnostic ignored "-Wsign-compare"
# endif
#endif
if (GetLastError() == NTE_BAD_KEYSET)
#ifdef __GNUC__
# if ((__GNUC__ * 100) + __GNUC_MINOR__) >= 406
# pragma GCC diagnostic pop
# endif
#endif
{
if (! CryptAcquireContext(&crypt_prov,
"Container",
NULL,
PROV_RSA_FULL,
CRYPT_NEWKEYSET))
{
throw std::runtime_error(
"unable to acquire crypt context with new keyset");
}
}
else
{
throw std::runtime_error("unable to acquire crypt context");
}
} }
} }
~WindowsCryptProvider() ~WindowsCryptProvider()