If the option MBEDTLS_TEST_NULL_ENTROPY is enabled, the cmake generated
makefile will generate an error unless a UNSAFE_BUILD switch is also enabled.
Equally, a similar warning will always be generated if the Makefile is built,
and another warning is generated on every compilation of entropy.c.
This is to ensure the user is aware of what they're doing when they enable the
null entropy option.
Update the NV entropy seed before generating any entropy for outside
use. The reason this is triggered here and not in mbedtls_entropy_init(),
is that not all entropy sources mights have been added at that time.
Introduces mbedtls_nv_seed_read() and mbedtls_nv_seed_write().
The platform-layer functions are only available when
MBEDTLS_ENTROPY_NV_SEED is enabled.
Add a switch that turns entropy collecting off entirely, but enables
mbed TLS to run in an entirely unsafe mode. Enables to test mbed TLS
on platforms that don't have their entropy sources integrated yet.
Commit daf534d from PR #457 breaks the build. This may reintroduce a
clang-analyse warning, but this is the wrong fix for that.
The fix removed a call to mbedtls_ecp_curve_info_from_grp_id() to find
the curve info. This fix adds that back in.
The check is already effectively performed later in the function, but
implicitly, so Clang's analysis fail to notice the functions are in
fact safe. Pulling the check up to the top helps Clang to verify the
behaviour.
Since the buffer is used in a few places, it seems Clang isn't clever
enough to realise that the first byte is never touched. So, even though
the function has a correct null check for ssl->handshake, Clang
complains. Pulling the handshake type out into its own variable is
enough for Clang's analysis to kick in though.
The function appears to be safe, since grow() is called with sensible
arguments in previous functions. Ideally Clang would be clever enough to
realise this. Even if N has size MBEDTLS_MPI_MAX_LIMBS, which will
cause the grow to fail, the affected lines in montmul won't be reached.
Having this sanity check can hardly hurt though.
It is used only by `mbedtls_sha512_process()`, and in case `MBEDTLS_SHA512_PROCESS_ALT` is defined, it still cannot be reused because of `static` declaration.
On x32 systems, pointers are 4-bytes wide and are therefore stored in %e?x
registers (instead of %r?x registers). These registers must be accessed using
"addl" instead of "addq", however the GNU assembler will acccept the generic
"add" instruction and determine the correct opcode based on the registers
passed to it.
The server code parses the client hello extensions even when the
protocol is SSLv3 and this behaviour is non compliant with rfc6101.
Also the server sends extensions in the server hello and omitting
them may prevent interoperability problems.
Commit daf534d from PR #457 breaks the build. This may reintroduce a
clang-analyse warning, but this is the wrong fix for that.
The fix removed a call to mbedtls_ecp_curve_info_from_grp_id() to find
the curve info. This fix adds that back in.
