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Alternative implementations are often hardware accelerators and might not need an RNG for blinding. But if they do, then we make them misuse the RNG in the deterministic case. There are several way around this: - Exposing a lower level function for replacement. This would be the optimal solution, but litters the API and is not backward compatible. - Introducing a new compile time option for replacing the deterministic function. This would mostly cover the same code as MBEDTLS_ECDSA_DETERMINISTIC and would be yet another compile time flag. - Reusing the existing MBEDTLS_ECDSA_DETERMINISTIC macro. This changes the algorithm used by the PK layer from deterministic to randomised if the alternative implementation is present. This commit implements the third option. This is a temporary solution and should be fixed at the next device driver API change. |
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mbedtls | ||
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CMakeLists.txt |