D7393.diff
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	diff --git a/src/key.h b/src/key.h
	--- a/src/key.h
	+++ b/src/key.h
	@@ -95,6 +95,9 @@
	//! Generate a new private key using a cryptographic PRNG.
	void MakeNewKey(bool fCompressed);

	+ //! Negate private key
	+ bool Negate();
	+
	/**
	* Convert the private key to a CPrivKey (serialized OpenSSL private key
	* data).
	diff --git a/src/key.cpp b/src/key.cpp
	--- a/src/key.cpp
	+++ b/src/key.cpp
	@@ -188,6 +188,11 @@
	fCompressed = fCompressedIn;
	}

	+bool CKey::Negate() {
	+ assert(fValid);
	+ return secp256k1_ec_privkey_negate(secp256k1_context_sign, keydata.data());
	+}
	+
	CPrivKey CKey::GetPrivKey() const {
	assert(fValid);
	CPrivKey privkey;