From http://en.wikipedia.org/wiki/Malloc#Casting_and_type_safety
" Casting and type safety
malloc returns a void pointer (void *), which indicates that it is a
pointer to a region of unknown data type. One may "cast" (see type
conversion) this pointer to a specific type, as in
int *ptr = (int*)malloc(10 * sizeof (int));
When using C, this is considered bad practice; it is redundant under the
C standard. Moreover, putting in a cast may mask failure to include the
header stdlib.h, in which the prototype for malloc is found. In the
absence of a prototype for malloc, the C compiler will assume that
malloc returns an int, and will issue a warning in a context such as the
above, provided the error is not masked by a cast. On certain
architectures and data models (such as LP64 on 64 bit systems, where
long and pointers are 64 bit and int is 32 bit), this error can actually
result in undefined behavior, as the implicitly declared malloc returns
a 32 bit value whereas the actually defined function returns a 64 bit
value. Depending on calling conventions and memory layout, this may
result in stack smashing.
The returned pointer need not be explicitly cast to a more specific
pointer type, since ANSI C defines an implicit conversion between the
void pointer type and other pointers to objects. An explicit cast of
malloc's return value is sometimes performed because malloc originally
returned a char *, but this cast is unnecessary in standard C
code.[4][5] Omitting the cast, however, creates an incompatibility with
C++, which does require it.
The lack of a specific pointer type returned from malloc is type-unsafe
behaviour: malloc allocates based on byte count but not on type. This
distinguishes it from the C++ new operator that returns a pointer whose
type relies on the operand. (see C Type Safety). "
See also
http://www.opensc-project.org/pipermail/opensc-devel/2010-August/014586.html
git-svn-id: https://www.opensc-project.org/svnp/opensc/trunk@4636 c6295689-39f2-0310-b995-f0e70906c6a9
* reduce to a few, supported functions.
* change all functions to take the debug level as parameter.
* use symbolic names for the debug levels.
* fix tools to pass "verbose"/"opt_debug" as ctx->debug.
git-svn-id: https://www.opensc-project.org/svnp/opensc/trunk@4118 c6295689-39f2-0310-b995-f0e70906c6a9
- Remove slot abstraction from internal API and all reader drivers. CT-API (from where it all comes from) readers with multiple slots (if still found) can be presented as separate readers, OpenCT should remove the slot abstraction, PC/SC never knew about it. None of the tools knew how to use slots.
- Add sc_cancel (translates to SCardCancel)
- Re-implement sc_wait_for_event; support a blocking call.
- Replace the "int reader" API with "* sc_reader_t" style; add "Get reader by name" functionality.
- Remove "action" parameter from sc_disconnect_card() (was not used)
git-svn-id: https://www.opensc-project.org/svnp/opensc/trunk@3931 c6295689-39f2-0310-b995-f0e70906c6a9
When trying to import a too large keyfile as a data object, TrueCrypt received a CKR_GENERAL_ERROR before this.
git-svn-id: https://www.opensc-project.org/svnp/opensc/trunk@3926 c6295689-39f2-0310-b995-f0e70906c6a9
code (should now support extended APDUs and is
hopefully better documented. Note: support for
the T0 ENVELOPE command is still missing due to
a lack of test cards).
-add new APDU case constants SC_APDU_CASE_2 etc.
which let OpenSC decides, based on the card
capabilities, whether to use short or extended
APDUs.
-add new capability SC_CARD_CAP_RSA_2048 for
cards supporting 2048 bit RSA operations (note:
this is more a preliminary hack)
git-svn-id: https://www.opensc-project.org/svnp/opensc/trunk@2795 c6295689-39f2-0310-b995-f0e70906c6a9
void sc_mem_clear(void *ptr, size_t len);
to clear a memory buffer. If OpenSSL is used this function
is a wrapper for OPENSSL_cleanse, otherwise memset is currenlty used.
Use this function to clear memory buffers with sensitive content.
git-svn-id: https://www.opensc-project.org/svnp/opensc/trunk@2601 c6295689-39f2-0310-b995-f0e70906c6a9
andre
martin
viktor.tarasov
ep
ludovic.rousseau
aj
vtarasov
nils
sth
bert