From 5ce650382352c1503f40abf08129ada69402af55 Mon Sep 17 00:00:00 2001 From: bitflash-coin Date: Tue, 4 Aug 2026 06:34:32 -0700 Subject: public commit --- src/key.h | 190 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 190 insertions(+) create mode 100644 src/key.h (limited to 'src/key.h') diff --git a/src/key.h b/src/key.h new file mode 100644 index 0000000..6cc2a24 --- /dev/null +++ b/src/key.h @@ -0,0 +1,190 @@ +// Copyright (c) 2009 Satoshi Nakamoto +// Distributed under the MIT/X11 software license, see the accompanying +// file license.txt or http://www.opensource.org/licenses/mit-license.php. + + +// secp160k1 +// const unsigned int PRIVATE_KEY_SIZE = 192; +// const unsigned int PUBLIC_KEY_SIZE = 41; +// const unsigned int SIGNATURE_SIZE = 48; +// +// secp192k1 +// const unsigned int PRIVATE_KEY_SIZE = 222; +// const unsigned int PUBLIC_KEY_SIZE = 49; +// const unsigned int SIGNATURE_SIZE = 57; +// +// secp224k1 +// const unsigned int PRIVATE_KEY_SIZE = 250; +// const unsigned int PUBLIC_KEY_SIZE = 57; +// const unsigned int SIGNATURE_SIZE = 66; +// +// secp256k1: +// const unsigned int PRIVATE_KEY_SIZE = 279; +// const unsigned int PUBLIC_KEY_SIZE = 65; +// const unsigned int SIGNATURE_SIZE = 72; +// +// see www.keylength.com +// script supports up to 75 for single byte push + + + +class key_error : public std::runtime_error +{ +public: + explicit key_error(const std::string& str) : std::runtime_error(str) {} +}; + + +// secure_allocator is defined is serialize.h +typedef vector > CPrivKey; + + + +class CKey +{ +protected: + EC_KEY* pkey; + +public: + CKey() + { + pkey = EC_KEY_new_by_curve_name(NID_secp256k1); + if (pkey == NULL) + throw key_error("CKey::CKey() : EC_KEY_new_by_curve_name failed"); + } + + CKey(const CKey& b) + { + pkey = EC_KEY_dup(b.pkey); + if (pkey == NULL) + throw key_error("CKey::CKey(const CKey&) : EC_KEY_dup failed"); + } + + CKey& operator=(const CKey& b) + { + if (!EC_KEY_copy(pkey, b.pkey)) + throw key_error("CKey::operator=(const CKey&) : EC_KEY_copy failed"); + return (*this); + } + + ~CKey() + { + EC_KEY_free(pkey); + } + + void MakeNewKey() + { + if (!EC_KEY_generate_key(pkey)) + throw key_error("CKey::MakeNewKey() : EC_KEY_generate_key failed"); + } + + bool SetPrivKey(const CPrivKey& vchPrivKey) + { + const unsigned char* pbegin = &vchPrivKey[0]; + if (!d2i_ECPrivateKey(&pkey, &pbegin, vchPrivKey.size())) + return false; + return true; + } + + // Load a raw 32-byte scalar, the form BIP32 derivation produces. + // + // SetPrivKey above takes DER and cannot be used for this: handing it a + // scalar makes d2i_ECPrivateKey fail, and if the caller ignores the return + // value -- as one attempt at this did -- the key is left with no material + // at all and the address it produces has no private half. Coins paid there + // are gone. Hence a separate entry point rather than a looser SetPrivKey. + // + // The public half is computed here rather than read from anywhere: + // pub = G * secret. + bool SetSecret(const std::vector& vchSecret) + { + if (vchSecret.size() != 32) + return false; + + bool fOk = false; + BIGNUM* bn = BN_bin2bn(&vchSecret[0], 32, NULL); + EC_POINT* pubkey = NULL; + if (bn && EC_KEY_set_private_key(pkey, bn)) + { + const EC_GROUP* group = EC_KEY_get0_group(pkey); + pubkey = EC_POINT_new(group); + if (pubkey && + EC_POINT_mul(group, pubkey, bn, NULL, NULL, NULL) && + EC_KEY_set_public_key(pkey, pubkey)) + fOk = true; + } + if (pubkey) + EC_POINT_free(pubkey); + if (bn) + BN_clear_free(bn); // it held the secret + return fOk; + } + + CPrivKey GetPrivKey() const + { + unsigned int nSize = i2d_ECPrivateKey(pkey, NULL); + if (!nSize) + throw key_error("CKey::GetPrivKey() : i2d_ECPrivateKey failed"); + CPrivKey vchPrivKey(nSize, 0); + unsigned char* pbegin = &vchPrivKey[0]; + if (i2d_ECPrivateKey(pkey, &pbegin) != nSize) + throw key_error("CKey::GetPrivKey() : i2d_ECPrivateKey returned unexpected size"); + return vchPrivKey; + } + + bool SetPubKey(const vector& vchPubKey) + { + const unsigned char* pbegin = &vchPubKey[0]; + if (!o2i_ECPublicKey(&pkey, &pbegin, vchPubKey.size())) + return false; + return true; + } + + vector GetPubKey() const + { + unsigned int nSize = i2o_ECPublicKey(pkey, NULL); + if (!nSize) + throw key_error("CKey::GetPubKey() : i2o_ECPublicKey failed"); + vector vchPubKey(nSize, 0); + unsigned char* pbegin = &vchPubKey[0]; + if (i2o_ECPublicKey(pkey, &pbegin) != nSize) + throw key_error("CKey::GetPubKey() : i2o_ECPublicKey returned unexpected size"); + return vchPubKey; + } + + bool Sign(uint256 hash, vector& vchSig) + { + vchSig.clear(); + unsigned char pchSig[10000]; + unsigned int nSize = 0; + if (!ECDSA_sign(0, (unsigned char*)&hash, sizeof(hash), pchSig, &nSize, pkey)) + return false; + vchSig.resize(nSize); + memcpy(&vchSig[0], pchSig, nSize); + return true; + } + + bool Verify(uint256 hash, const vector& vchSig) + { + // -1 = error, 0 = bad sig, 1 = good + if (ECDSA_verify(0, (unsigned char*)&hash, sizeof(hash), &vchSig[0], vchSig.size(), pkey) != 1) + return false; + return true; + } + + static bool Sign(const CPrivKey& vchPrivKey, uint256 hash, vector& vchSig) + { + CKey key; + if (!key.SetPrivKey(vchPrivKey)) + return false; + return key.Sign(hash, vchSig); + } + + static bool Verify(const vector& vchPubKey, uint256 hash, const vector& vchSig) + { + CKey key; + if (!key.SetPubKey(vchPubKey)) + return false; + return key.Verify(hash, vchSig); + } +}; -- cgit v1.2.3