| .. |
| Copyright 2019,2020 NXP |
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| .. highlight:: bat |
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| .. _ex-sss-hkdf: |
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| ======================================================================= |
| HKDF Example |
| ======================================================================= |
| |
| This project demonstrates an HMAC Key derivation operation based on |
| info and salt using SSS APIs. |
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| Refer - :file:`simw-top/sss/ex/hkdf/ex_sss_hkdf.c` |
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| Prerequisites |
| ======================================================================= |
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| - Build Plug & Trust middleware stack. (Refer :ref:`building`) |
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| About the Example |
| ======================================================================= |
| This example does a HMAC Key derivation operation based on the info and salt. |
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| |
| It uses the following APIs and data types: |
| - :cpp:func:`sss_derive_key_context_init()` |
| - :cpp:enumerator:`kAlgorithm_SSS_HMAC_SHA256` from :cpp:type:`sss_algorithm_t` |
| - :cpp:enumerator:`kMode_SSS_ComputeSharedSecret` from :cpp:type:`sss_mode_t` |
| - :cpp:enumerator:`kSSS_CipherType_HMAC` from :cpp:type:`sss_cipher_type_t` |
| - :cpp:func:`sss_derive_key_go()` |
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| Console output |
| ======================================================================= |
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| If everything is successful, the output will be similar to: |
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| .. literalinclude:: out_ex_hkdf.rst.txt |
| :start-after: sss :WARN :!!!Not recommended for production use.!!! |
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