Cryptoauthlib

New features

- Added Zephyr support and zephyr driver api HALs for I2C & SPI. Adding cryptoauthlib to a zephyr project CMakeLists.txt is now possible - use subdirectory(cryptoauthlib/lib). One can also include the repo in the west manifest
- Added SWI device support for linux platforms using hardware uarts
- Added contributing guidelines and PR process documentation
- SWI bitbang driver for harmony - supports Atmel SWI and ECC204 protocols

Fixes

- Wolfssl build errors when generating MHC projects containing wolfssl
- Removed zero length aad limitation in CCM implementation
- Changed ECC204 zone identifiers and slot types to align with cryptoauthlib standard forms
- XC8/XC16 build warnings
- Several pkcs11 fixes - token_init deadlock, null num_in for private key writes, secret key length parsing, object_create failing, etc
- Null pointer access violation in atcab_release when using a native hal and double free in openssl implementation of atcac_pk_verify

New features
- All memory allocations now go through the hal_ platform definitions. In harmony these are the OSAL_ fuctions which work with any of the supported RTOS'.
- Enable multiple intefaces in the Harmony 3 test project through the user interface.
- Kit protocol over UART has been added. This can be paired with the included hosting application
- Simple kit protocol hosting application has been added. It is available in app/kit_host and through Harmony 3. This is a preview release of the application.

Fixes
- Enable ATSHA206A api in the python extension
- Made the linux i2c configuration default to 100khz so they should work again without having to make modifications to the baud rate field.
- Fix pkcs11 static configuration option when used with the trust platform configuration file
- Fix PKCS11 ec_point return value when pValue is null (libp11 checks the size in this manner before requesting

New features
- Core support for kit protocol over serial ports (i.e. tty/COM ports)
- PKCS11 support for TA100 auth sessions

Fixes
- Fix mbedtls integration combinations that would produce unexpected behavior. All variations of sign/verify _ALT now work as expected given a configured key (for example if a key is configured as a stored public and VERIFY_ALT is enabled then library will perform a stored key verify rather than an external public key load and verify)
- Added mbedtls integration tests to confirm that integrations are working on a target platform as expected. These generally bootstrap using NIST example vectors before using the validated functions/algorithms to test the remaining integration.
- Clean up warnings when run with very strict settings (-Wall -Wextra -pedantic -Werror)
- Fix false wake errors when baud rate switching for I2C
- Fix for I2C errors that could be created on the bus when there are devices on the bus that support general calls - this fix should also correct linux zero length kernel messages when enabled.
- Fix ESP32 HAL to work with the updated HAL structure.

API Updates
- HAL API has been signifiantly revised to improve portability. This update simplies the requirements of each HAL to only the physical transport mechanisms. Please see the hal porting and library [upgrading notes](https://github.com/MicrochipTech/cryptoauthlib/wiki/Upgrading-to-v3.3)
- Internal structures have been updated by removing obsolete elements and combining mandatory fields. This saves significant memory in both program and data regions.
- Inclusive language update: all remaining legacy language elements have been updated. Where this impacts the external API there is the option ATCA_ENABLE_DEPRECATED to use the previous names.

New features
- ECC204 support has been added with one wire HAL support.
- ECC204, SHA206, one wire and single wire (uart and gpio) hals have been added to the Harmony 3 configurator.
- PKCS11 support for symmetric (AES & HMAC) keys has been added and enabled for additional mechanisms such as HMAC signing and AES encrypt/decrypt

Fixes
- pkcs11_token_init had several conditions that were corrected
- fix to detect differences in i2c clock rate specifications between flexcom and sercom configurators in Harmony 3 and the emit the correct value for the cryptoauthlib interface config structure.

New features
- Converted from travis-ci and appveyor to github actions workflows
- AES CCM & CBC-MAC upper layer API using AES-ECB primitives
- Additional software crypto library interface functions for asymmetric cryptography (sign, verify, ecdh, etc) for mbedtls integrations
- XC8 & XC16 compiler support

Fixes
- PKCS11 Pin length check rejecting valid pin lengths
- aes-gcm nist vector test failed with mbedtls crypto backend due to aad update not being executed when aad length was zero

New features
- Additional TA100 command support (requires NDA, consult with your FAE or submit a request through your myMicrochip account)
- Library build and install on linux now also installs the headers that were used to build the library including all configuration files like atca_config.h - customer applications building against the library will need to add the include/cryptoauthlib to their include search paths

Fixes
- Fixed errors produced when -fno-common was used during build of the library by resolving the variable declaration and exporting macros (tested with static/dynamic linkage on linux & windows platforms)
- Added a timeout during i2c plib commands in the Harmony3 hals to prevent system lockups from failed peripheral transfers that don't return errors.