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25b4c6794a
* TVM instructions: SECP256K1_XONLY_PUBKEY_TWEAK_ADD, SETCONTCTRMANY(X) * Add tests for xonly_pubkey_tweak_add * added secp256k1 as submodule, since we need extrakeys feature of secp256k1 * cleanup * add ton_crypto_core secp256k1 dependency * adjust Dockerfile, android and wasm builds * adjust nix build * test windows build with SECP256K1_ENABLE_MODULE_EXTRAKEYS * test windows build with SECP256K1_ENABLE_MODULE_EXTRAKEYS * adjust android build * adjust emscripten build * adjust emscripten build * try macos-13 * emscripten build adjustments * windows build adjustments * final corrections --------- Co-authored-by: neodix <neodix@ton.org>
63 lines
2.5 KiB
C
63 lines
2.5 KiB
C
#ifndef SECP256K1_ECDH_H
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#define SECP256K1_ECDH_H
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#include "secp256k1.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/** A pointer to a function that hashes an EC point to obtain an ECDH secret
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*
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* Returns: 1 if the point was successfully hashed.
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* 0 will cause secp256k1_ecdh to fail and return 0.
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* Other return values are not allowed, and the behaviour of
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* secp256k1_ecdh is undefined for other return values.
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* Out: output: pointer to an array to be filled by the function
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* In: x32: pointer to a 32-byte x coordinate
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* y32: pointer to a 32-byte y coordinate
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* data: arbitrary data pointer that is passed through
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*/
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typedef int (*secp256k1_ecdh_hash_function)(
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unsigned char *output,
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const unsigned char *x32,
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const unsigned char *y32,
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void *data
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);
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/** An implementation of SHA256 hash function that applies to compressed public key.
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* Populates the output parameter with 32 bytes. */
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SECP256K1_API const secp256k1_ecdh_hash_function secp256k1_ecdh_hash_function_sha256;
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/** A default ECDH hash function (currently equal to secp256k1_ecdh_hash_function_sha256).
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* Populates the output parameter with 32 bytes. */
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SECP256K1_API const secp256k1_ecdh_hash_function secp256k1_ecdh_hash_function_default;
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/** Compute an EC Diffie-Hellman secret in constant time
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*
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* Returns: 1: exponentiation was successful
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* 0: scalar was invalid (zero or overflow) or hashfp returned 0
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* Args: ctx: pointer to a context object.
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* Out: output: pointer to an array to be filled by hashfp.
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* In: pubkey: pointer to a secp256k1_pubkey containing an initialized public key.
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* seckey: a 32-byte scalar with which to multiply the point.
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* hashfp: pointer to a hash function. If NULL,
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* secp256k1_ecdh_hash_function_sha256 is used
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* (in which case, 32 bytes will be written to output).
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* data: arbitrary data pointer that is passed through to hashfp
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* (can be NULL for secp256k1_ecdh_hash_function_sha256).
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*/
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SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_ecdh(
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const secp256k1_context *ctx,
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unsigned char *output,
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const secp256k1_pubkey *pubkey,
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const unsigned char *seckey,
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secp256k1_ecdh_hash_function hashfp,
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void *data
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) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3) SECP256K1_ARG_NONNULL(4);
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#ifdef __cplusplus
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}
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#endif
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#endif /* SECP256K1_ECDH_H */
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