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Add CKey::ECDH

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This commit is contained in:
Steven Roose 2019-03-19 20:28:28 +00:00
parent aa375e66c1
commit 045e615692
No known key found for this signature in database
GPG key ID: 7FC91380BB4CE800
2 changed files with 15 additions and 0 deletions
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10
src/key.cpp
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@ -12,6 +12,7 @@
#include <secp256k1.h> #include <secp256k1.h>
#include <secp256k1_recovery.h> #include <secp256k1_recovery.h>
#include <secp256k1_ecdh.h>
static secp256k1_context* secp256k1_context_sign = nullptr; static secp256k1_context* secp256k1_context_sign = nullptr;
@ -202,6 +203,15 @@ bool SigHasLowR(const secp256k1_ecdsa_signature* sig)
return compact_sig[0] < 0x80; return compact_sig[0] < 0x80;
} }
uint256 CKey::ECDH(const CPubKey& pubkey) const {
assert(fValid);
uint256 result;
secp256k1_pubkey pkey;
assert(secp256k1_ec_pubkey_parse(secp256k1_context_sign, &pkey, pubkey.begin(), pubkey.size()));
assert(secp256k1_ecdh(secp256k1_context_sign, result.begin(), &pkey, begin(), NULL, NULL));
return result;
}
bool CKey::Sign(const uint256 &hash, std::vector<unsigned char>& vchSig, bool grind, uint32_t test_case) const { bool CKey::Sign(const uint256 &hash, std::vector<unsigned char>& vchSig, bool grind, uint32_t test_case) const {
if (!fValid) if (!fValid)
return false; return false;

5
src/key.h
View file

@ -110,6 +110,11 @@ public:
*/ */
CPubKey GetPubKey() const; CPubKey GetPubKey() const;
/**
* Compute the ECDH exchange result using this private key and another public key.
*/
uint256 ECDH(const CPubKey& pubkey) const;
/** /**
* Create a DER-serialized signature. * Create a DER-serialized signature.
* The test_case parameter tweaks the deterministic nonce. * The test_case parameter tweaks the deterministic nonce.