A pointer to a function that hashes an EC point to obtain an ECDH secret
Compute an EC Diffie-Hellman secret in constant time
A default ECDH hash function (currently equal to secp256k1_ecdh_hash_function_sha256). * Populates the output parameter with 32 bytes.
An implementation of SHA256 hash function that applies to compressed public key. * Populates the output parameter with 32 bytes.