libutee: remove leftover references to libmpa

Removes references to libmpa removed since OP-TEE release tag 3.9.0,
by commit 7fb525f1f8a6 ("Remove libmpa in favor of libmbedtls").

This change remov

libutee: remove leftover references to libmpa

Removes references to libmpa removed since OP-TEE release tag 3.9.0,
by commit 7fb525f1f8a6 ("Remove libmpa in favor of libmbedtls").

This change removes configuration switch CFG_TA_MBEDTLS_MPI
and CFG_TA_MBEDTLS that are no more used by OP-TEE component.

Acked-by: Jens Wiklander <jens.wiklander@linaro.org>
Signed-off-by: Etienne Carriere <etienne.carriere@foss.st.com>

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Remove libmpa in favor of libmbedtls

We currently have two "big numbers" library, Mbed TLS and MPA. Both can
be used by libutee to implement the TEE Internal Core API Arithmetical
functions, and by

Remove libmpa in favor of libmbedtls

We currently have two "big numbers" library, Mbed TLS and MPA. Both can
be used by libutee to implement the TEE Internal Core API Arithmetical
functions, and by the TEE core or pseudo-TAs. This situation is
reflected by two configuration variables allowing to choose between
libmbedtls and libmpa:

- CFG_TA_MBEDTLS_MPI (default y) configures libutee,
- CFG_CORE_MBEDTLS_MPI (default y) configures the TEE core/PTAs.

In addition there is CFG_TA_MBEDTLS (default y, mandatory when
CFG_TA_MBEDTLS_MPI is y) to build libmbedtls and install it into the
SDK for direct use by TAs (libmbedtls also has function to deal with
certificates for instance).

MBed TLS has been supported and used by default for just over a year;
and we have recently found an issue with the MPA implementation of the
integer multiplication with modulus (mpa_mulmod()) [1] [2]. Therefore,
now is a good time to remove libmpa and use libmbedtls instead.

Link: [1] https://github.com/OP-TEE/optee_os/pull/3541#issuecomment-577592381
Link: [2] https://github.com/OP-TEE/optee_test/pull/389
Signed-off-by: Jerome Forissier <jerome@forissier.org>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>

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Remove license notice from STMicroelectronics files

Since a while the source files license info are defined by SPDX
identifiers. We can safely remove the verbose license text from the
files that are

Remove license notice from STMicroelectronics files

Since a while the source files license info are defined by SPDX
identifiers. We can safely remove the verbose license text from the
files that are owned by either only STMicroelectronics or only both
Linaro and STMicroelectronics.

Signed-off-by: Etienne Carriere <etienne.carriere@st.com>
Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>

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libutee: introduce CFG_TA_BIGNUM_MAX_BITS

Make the size of big numbers in libutee configurable. This controls
the size of the big numbers that can be manipulated through the TEE
Internal Core API (A

libutee: introduce CFG_TA_BIGNUM_MAX_BITS

Make the size of big numbers in libutee configurable. This controls
the size of the big numbers that can be manipulated through the TEE
Internal Core API (Arithmetical functions).

Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>

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Add SPDX license identifiers

Adds one SPDX-License-Identifier line [1] to each source files that
contains license text.

Generated by [2]:
spdxify.py --add-spdx optee_os/

The scancode tool [3] wa

Add SPDX license identifiers

Adds one SPDX-License-Identifier line [1] to each source files that
contains license text.

Generated by [2]:
spdxify.py --add-spdx optee_os/

The scancode tool [3] was used to double check the license matching
code in the Python script. All the licenses detected by scancode are
either detected by spdxify.py, or have no SPDX identifier, or are false
matches.

Link: [1] https://spdx.org/licenses/
Link: [2] https://github.com/jforissier/misc/blob/f7b56c8/spdxify.py
Link: [3] https://github.com/nexB/scancode-toolkit
Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org>
Acked-by: Joakim Bech <joakim.bech@linaro.org>

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Added Abstract Layer for PRNG

- Extended crypto_ops with a new prng_ops which handles prng operations.
- Replace calls to get_rng_array() with crypto_ops.prng.read(), this
enforces PRNG operations

Added Abstract Layer for PRNG

- Extended crypto_ops with a new prng_ops which handles prng operations.
- Replace calls to get_rng_array() with crypto_ops.prng.read(), this
enforces PRNG operations go through PRNG HAL, instead of invoking
platform-dependent PRNG implementation directly.
- Create a new mpa_set_random_generator() interface for mpa user to register
a callback to generate random number, instead of expecting the user to provide
a get_rng_array(). This enables libmpa uses crypto_ops.prng.read().
- Added a new configuration CFG_WITH_PRNG_SOFTWARE to toggle SW/HW-dependent
PRNG implementation.
- The SW PRNG implementation is supplied by backed cryto library(libtomcrypt).
- Added a new SW PRNG 'Fortuna' to libtomcrypt.
- Added a new SW PRNG 'RC4' to libtomcrypt, when Fortuna is not available due
to AES and SHA256 not available, fallback to RC4.
- Get rid of bad implemented SW PRNG in plat_vexpress(rng_support.c).
- If CFG_WITH_PRNG_SOFTWARE is not enabled, the platform needs to supply
hw_get_random_byte().

Signed-off-by: SY Chiu <sy.chiu@linaro.org>
Reviewed-by: Pascal Brand <pascal.brand@linaro.org>
Reviewed-by: Joakim Bech <joakim.bech@linaro.org>
Reviewed-by: Jerome Forissier <jerome.forissier@linaro.org>
Tested-by: Pascal Brand <pascal.brand@linaro.org> (STM platform)
Tested-by: SY Chiu <sy.chiu@linaro.org> (QEMU)

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Open-source the TEE Core

Signed-off-by: Pascal Brand <pascal.brand@st.com>