| .. |
| Copyright 2019,2020 NXP |
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| .. highlight:: bat |
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| .. _ex-sss-ecc_attest_mont: |
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| ======================================================================= |
| ECC MONTGOMERY-25519 Key Attestation Example |
| ======================================================================= |
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| This project demonstrates ecc montogomery25519 key attestation and verification |
| with ecc nist256 key using SSS API. |
| Signing on montgomery public key is done with key in the big endian format inside secure element. |
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| Refer - :file:`simw-top/sss/ex/attest_mont/ex_sss_mont_attest.c` |
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| .. note :: |
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| For twisted edward curve and montgomery 448 curve also the attestation signing |
| is done with public key in big endian format. |
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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 reads a montgomery-25519 public key with attestation. |
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| It uses the following APIs and data types: |
| - :cpp:func:`sss_key_store_set_key()` |
| - :cpp:func:`sss_key_store_generate_key()` |
| - :cpp:func:`sss_se05x_key_store_get_key_attst()` |
| - :cpp:enumerator:`kAlgorithm_SSS_ECDSA_SHA256` from :cpp:type:`sss_algorithm_t` |
| - :cpp:enumerator:`kMode_SSS_Verify` from :cpp:type:`sss_mode_t` |
| - :cpp:func:`sss_asymmetric_verify_digest()` |
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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_attest_mont.rst.txt |
| :start-after: sss :WARN :!!!Not recommended for production use.!!! |
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