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- int ec_key_gen(unsigned char* pub_key_x, unsigned char* pub_key_y, unsigned char* priv_key);
- unsigned long check_key(unsigned char* given_key_x, unsigned char* given_key_y);
- unsigned long compute_shared_ECDHE_key(unsigned char* given_key_x, unsigned char* given_key_y, unsigned char* priv_key, unsigned char* shared_key, unsigned char* derived_key);
- int generate_sha256_hash(const unsigned char *message, size_t message_len, unsigned char *digest);
- int aes_gcm(int enc, unsigned char *key, unsigned char *iv, unsigned char* plaintext, int plaintext_len, unsigned char *ciphertext, int* op_ciphertext_len, unsigned char* tag);
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