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e7856e6e69
We want the ecdh stuff for onion routing. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
31 lines
934 B
C
31 lines
934 B
C
#ifndef _SECP256K1_ECDH_
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# define _SECP256K1_ECDH_
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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: point: pointer to a public point
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* scalar: 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 *point,
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const unsigned char *scalar
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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
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