2022-12-02 07:17:14 +01:00
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# Tillitis TKey Provisioning Tool
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2022-09-19 08:51:11 +02:00
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## Introduction
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2022-12-02 07:17:14 +01:00
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TKey Provisioning Tool (tpt) is a program for generating the 32 byte
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Unique Device Secret (UDS). The tool will also generate the 8 byte
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Unique Device Identity. Both the UDS and the UDI are injected into the
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FPGA bitstream file during build.
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The UDS is generated using HKDF (RFC 5869), and the user is expected
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to supply a secret as part of the input to the HKDF Extract operation.
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The Input Keying Material is generated by extracting 256 bytes using
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the Python secrets module.
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2022-09-19 08:51:11 +02:00
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The tool uses [python-hkdf](https://github.com/casebeer/python-hkdf).
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