rust-secp256k1-unsafe-fast/secp256k1-sys/depend/secp256k1/include/secp256k1_ecdh.h

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#ifndef SECP256K1_ECDH_H
#define SECP256K1_ECDH_H
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#include "secp256k1.h"
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#ifdef __cplusplus
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extern "C" {
#endif
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/** A pointer to a function that applies hash function to a point
*
* Returns: 1 if a point was successfully hashed. 0 will cause ecdh to fail
* Out: output: pointer to an array to be filled by the function
* In: x: pointer to a 32-byte x coordinate
* y: pointer to a 32-byte y coordinate
* data: Arbitrary data pointer that is passed through
*/
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typedef int (*rustsecp256k1_v0_1_1_ecdh_hash_function)(
unsigned char *output,
const unsigned char *x,
const unsigned char *y,
void *data
);
/** An implementation of SHA256 hash function that applies to compressed public key. */
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SECP256K1_API extern const rustsecp256k1_v0_1_1_ecdh_hash_function rustsecp256k1_v0_1_1_ecdh_hash_function_sha256;
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/** A default ecdh hash function (currently equal to rustsecp256k1_v0_1_1_ecdh_hash_function_sha256). */
SECP256K1_API extern const rustsecp256k1_v0_1_1_ecdh_hash_function rustsecp256k1_v0_1_1_ecdh_hash_function_default;
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/** Compute an EC Diffie-Hellman secret in constant time
* Returns: 1: exponentiation was successful
* 0: scalar was invalid (zero or overflow)
* Args: ctx: pointer to a context object (cannot be NULL)
* Out: output: pointer to an array to be filled by the function
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* In: pubkey: a pointer to a rustsecp256k1_v0_1_1_pubkey containing an
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* initialized public key
* privkey: a 32-byte scalar with which to multiply the point
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* hashfp: pointer to a hash function. If NULL, rustsecp256k1_v0_1_1_ecdh_hash_function_sha256 is used
* data: Arbitrary data pointer that is passed through
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*/
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SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int rustsecp256k1_v0_1_1_ecdh(
const rustsecp256k1_v0_1_1_context* ctx,
unsigned char *output,
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const rustsecp256k1_v0_1_1_pubkey *pubkey,
const unsigned char *privkey,
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rustsecp256k1_v0_1_1_ecdh_hash_function hashfp,
void *data
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) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3) SECP256K1_ARG_NONNULL(4);
#ifdef __cplusplus
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}
#endif
#endif /* SECP256K1_ECDH_H */