Libraries
libutils
OP-TEE core and OP-TEE development kit for Trusted Application provide a
standard C library that is named libutils. It implements many
standard functions like snprintf(), strncmp(), memcpy(),
malloc(). qsort(), and many more but not all standard C library
functions.
Note however that Trusted Applications implemented in C should use GP TEE
Internal Core API functions rather than their standard C library function
equivalent (e.g. TEE_MemMove() instead of memcpy() and
memmove(), or TEE_Malloc() instead of malloc() and friends).
This makes those TAs implementation more portable to other GP
TEE compliant environments.
When CFG_ULIBS_SHARED is enabled, libutils is assigned UUID
71855bba-6055-4293-a63f-b0963a737360.
libutee
The TEE Internal Core API describes services that are provided to Trusted Applications. libutee is a library that implements this API.
libutee is designed as a userland library specifically dedicated to OP-TEE Trusted Applications and aims at being executed in the non-privileged secure userspace.
Some services for this API are fully statically implemented inside the libutee library while some services for the API are implemented inside the OP-TEE core (privileged level) and libutee calls such services through system calls.
When CFG_ULIBS_SHARED is enabled, libutee is assigned UUID
4b3d937e-d57e-418b-8673-1c04f2420226.
libmbedtls
OP-TEE OS source tree provides support of the Mbed TLS library, named libmbedtls.
A specific build sequence can compile an instance of libmbedtls and link it to OP-TEE core. Another build sequence compiles an instance of libmbedtls that can be linked with Trusted Applications.
When Mbed TLS is embedded in OP-TEE core, it is used as the default software
implementation for most cryptography operations. When so, libtomcrypt is
still used as default software implementation for few crypto operations.
Embedding Mbed TLS in OP-TEE core requires CFG_CRYPTOLIB_NAME=mbedtls
and CFG_CRYPTOLIB_DIR=core/lib/libmbedtls.
When CFG_ULIBS_SHARED is enabled, libmbedtls userland library is
assigned UUID 87bb6ae8-4b1d-49fe-9986-2b966132c309.
libunw
OP-TEE OS source tree implements execution stack back trace debug facilities available to both OP-TEE core and Trusted Applications. The feature relies on a library named libunw.
libunw, when linked to a Trusted Application, is always linked as a static library.
libdl
libdl library implement API function dlopen(), dlsym() and
dlclose() used by Trusted Applications to support dynamic shared libraries.
When CFG_ULIBS_SHARED is enabled, libdl is assigned UUID
be807bbd-81e1-4dc4-bd99-3d363f240ece.