When `MBEDTLS_PLATFORM_C` is not enabled, our PSA Crypto implementation
depends on the standard C library for functions like snprintf() and
exit(). However, our implementation was not including the proper header
files nor redefining all `mbedtls_*` symbols properly to ensure
successful builds without MBEDTLS_PLATFORM_C. Add the necessary header
files and macro definitions to our PSA Crypto implementation.
When MBEDTLS_CHECK_PARAMS is enabled, it's required to have an
implementation of mbedtls_param_failed() present. Without it in the PSA
examples, building the PSA examples will result in linker errors like
the following.
../../library/libmbedcrypto.a(rsa.c.o): In function `mbedtls_rsa_import':
rsa.c:(.text+0x9fd): undefined reference to `mbedtls_param_failed'
../../library/libmbedcrypto.a(rsa.c.o): In function `mbedtls_rsa_import_raw':
rsa.c:(.text+0xb0b): undefined reference to `mbedtls_param_failed'
../../library/libmbedcrypto.a(rsa.c.o): In function `mbedtls_rsa_complete':
rsa.c:(.text+0xe63): undefined reference to `mbedtls_param_failed'
../../library/libmbedcrypto.a(rsa.c.o): In function `mbedtls_rsa_export_raw':
rsa.c:(.text+0xfee): undefined reference to `mbedtls_param_failed'
../../library/libmbedcrypto.a(rsa.c.o): In function `mbedtls_rsa_export':
rsa.c:(.text+0x116f): undefined reference to `mbedtls_param_failed'
../../library/libmbedcrypto.a(rsa.c.o):rsa.c:(.text+0x1304): more undefined
references to `mbedtls_param_failed' follow
collect2: error: ld returned 1 exit status
programs/psa/CMakeFiles/crypto_examples.dir/build.make:97: recipe for target
'programs/psa/crypto_examples' failed
make[2]: *** [programs/psa/crypto_examples] Error 1
Add an implementation of mbedtls_param_failed() to the PSA Crypto
examples to avoid getting this error on the PSA examples.
Remove the type and bits arguments to psa_allocate_key() and
psa_create_key(). They can be useful if the implementation wants to
know exactly how much space to allocate for the slot, but many
implementations (including ours) don't care, and it's possible to work
around their lack by deferring size-dependent actions to the time when
the key material is created. They are a burden to applications and
make the API more complex, and the benefits aren't worth it.
Change the API and adapt the implementation, the units test and the
sample code accordingly.
Add new initializers for key policies and use them in our docs, example
programs, tests, and library code. Prefer using the macro initializers
due to their straightforwardness.
GCC 4.8 warns that some variables may be used without having been
initialized. They aren't, but determining that takes nontrivial
analysis, so initialize them at the point of definition.
