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37 lines
1.3 KiB
Markdown
37 lines
1.3 KiB
Markdown
# Micro-ECC for RIOT
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This port of Micro-ECC to RIOT is based on the Micro-ECC
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[upstream](https://github.com/kmackay/micro-ecc) and adds `hwrng_read`
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(provided by RIOT) as the default RNG function if it is available on the target
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platform. This port also fixes a minor issue with unused variables in the
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upstream code.
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# Usage
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## Build
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Add
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```Makefile
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USEPKG += micro-ecc
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```
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to your Makefile.
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## Choosing the right API
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Before using the Micro-ECC library, you need to check the `Makefile.features`
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of your target board to see if `periph_hwrng` is provided.
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If it is provided, you may safely use `uECC_make_key` to generate ECDSA key
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pairs and call `uECC_sign`/`uECC_verify` to sign/verify the ECDSA signatures.
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If not, you cannot use `uECC_make_key` or `uECC_sign` APIs anymore. The ECDSA
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keys have to be generated on a platform with HWRNG support (e.g., `native`) and
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transferred to your target device. You need to use `uECC_sign_deterministic` to
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perform ECDSA deterministic signing (standardized by RFC 6979). You can still
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use `uECC_verify` to verify the signatures from both signing APIs.
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**WARNING** Calling `uECC_make_key` and `uECC_sign` APIs on platforms without
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HWRNG support will lead to compile failure.
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Examples of using these uECC APIs can be found in the `test` folder of the
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Micro-ECC upstream. |