32 lines
1.0 KiB
C
32 lines
1.0 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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/** Compute an EC Diffie-Hellman secret in constant time
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* Returns: 1: exponentiation was successful
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* 0: scalar was invalid (zero or overflow)
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* Args: ctx: pointer to a context object (cannot be NULL)
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* Out: result: a 32-byte array which will be populated by an ECDH
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* secret computed from the point and scalar
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* In: pubkey: a pointer to a secp256k1_pubkey containing an
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* initialized public key
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* privkey: a 32-byte scalar with which to multiply the point
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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 *result,
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const secp256k1_pubkey *pubkey,
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const unsigned char *privkey
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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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