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`mbedtls_ecdsa_sign_det` reuses the internal HMAC-DRBG instance to implement blinding. The advantage of this is that the algorithm is deterministic too, not just the resulting signature. The drawback is that the blinding is always the same for the same key and message. This diminishes the efficiency of blinding and leaks information about the private key. A function that takes external randomness fixes this weakness. |
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| mbedtls | ||
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| CMakeLists.txt | ||