Refactor: move code from key.h to key.cpp
This commit is contained in:
Gavin Andresen
parent
397737b913
commit
096e06dbb5
2 changed files with 285 additions and 246 deletions
263
src/key.cpp
263
src/key.cpp
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@ -2,8 +2,10 @@
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// Distributed under the MIT/X11 software license, see the accompanying
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// file license.txt or http://www.opensource.org/licenses/mit-license.php.
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#include <openssl/ec.h>
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#include <openssl/ecdsa.h>
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#include <openssl/obj_mac.h>
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#include "key.h"
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// Generate a private key from just the secret parameter
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int EC_KEY_regenerate_key(EC_KEY *eckey, BIGNUM *priv_key)
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@ -115,3 +117,262 @@ err:
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if (Q != NULL) EC_POINT_free(Q);
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return ret;
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}
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void CKey::SetCompressedPubKey()
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{
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EC_KEY_set_conv_form(pkey, POINT_CONVERSION_COMPRESSED);
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fCompressedPubKey = true;
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}
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void CKey::Reset()
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{
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fCompressedPubKey = false;
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pkey = EC_KEY_new_by_curve_name(NID_secp256k1);
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if (pkey == NULL)
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throw key_error("CKey::CKey() : EC_KEY_new_by_curve_name failed");
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fSet = false;
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}
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CKey::CKey()
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{
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Reset();
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}
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CKey::CKey(const CKey& b)
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{
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pkey = EC_KEY_dup(b.pkey);
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if (pkey == NULL)
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throw key_error("CKey::CKey(const CKey&) : EC_KEY_dup failed");
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fSet = b.fSet;
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}
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CKey& CKey::operator=(const CKey& b)
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{
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if (!EC_KEY_copy(pkey, b.pkey))
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throw key_error("CKey::operator=(const CKey&) : EC_KEY_copy failed");
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fSet = b.fSet;
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return (*this);
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}
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CKey::~CKey()
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{
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EC_KEY_free(pkey);
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}
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bool CKey::IsNull() const
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{
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return !fSet;
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}
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bool CKey::IsCompressed() const
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{
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return fCompressedPubKey;
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}
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void CKey::MakeNewKey(bool fCompressed)
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{
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if (!EC_KEY_generate_key(pkey))
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throw key_error("CKey::MakeNewKey() : EC_KEY_generate_key failed");
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if (fCompressed)
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SetCompressedPubKey();
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fSet = true;
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}
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bool CKey::SetPrivKey(const CPrivKey& vchPrivKey)
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{
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const unsigned char* pbegin = &vchPrivKey[0];
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if (!d2i_ECPrivateKey(&pkey, &pbegin, vchPrivKey.size()))
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return false;
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fSet = true;
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return true;
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}
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bool CKey::SetSecret(const CSecret& vchSecret, bool fCompressed)
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{
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EC_KEY_free(pkey);
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pkey = EC_KEY_new_by_curve_name(NID_secp256k1);
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if (pkey == NULL)
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throw key_error("CKey::SetSecret() : EC_KEY_new_by_curve_name failed");
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if (vchSecret.size() != 32)
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throw key_error("CKey::SetSecret() : secret must be 32 bytes");
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BIGNUM *bn = BN_bin2bn(&vchSecret[0],32,BN_new());
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if (bn == NULL)
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throw key_error("CKey::SetSecret() : BN_bin2bn failed");
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if (!EC_KEY_regenerate_key(pkey,bn))
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{
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BN_clear_free(bn);
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throw key_error("CKey::SetSecret() : EC_KEY_regenerate_key failed");
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}
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BN_clear_free(bn);
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fSet = true;
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if (fCompressed || fCompressedPubKey)
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SetCompressedPubKey();
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return true;
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}
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CSecret CKey::GetSecret(bool &fCompressed) const
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{
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CSecret vchRet;
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vchRet.resize(32);
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const BIGNUM *bn = EC_KEY_get0_private_key(pkey);
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int nBytes = BN_num_bytes(bn);
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if (bn == NULL)
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throw key_error("CKey::GetSecret() : EC_KEY_get0_private_key failed");
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int n=BN_bn2bin(bn,&vchRet[32 - nBytes]);
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if (n != nBytes)
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throw key_error("CKey::GetSecret(): BN_bn2bin failed");
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fCompressed = fCompressedPubKey;
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return vchRet;
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}
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CPrivKey CKey::GetPrivKey() const
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{
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int nSize = i2d_ECPrivateKey(pkey, NULL);
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if (!nSize)
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throw key_error("CKey::GetPrivKey() : i2d_ECPrivateKey failed");
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CPrivKey vchPrivKey(nSize, 0);
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unsigned char* pbegin = &vchPrivKey[0];
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if (i2d_ECPrivateKey(pkey, &pbegin) != nSize)
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throw key_error("CKey::GetPrivKey() : i2d_ECPrivateKey returned unexpected size");
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return vchPrivKey;
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}
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bool CKey::SetPubKey(const std::vector<unsigned char>& vchPubKey)
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{
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const unsigned char* pbegin = &vchPubKey[0];
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if (!o2i_ECPublicKey(&pkey, &pbegin, vchPubKey.size()))
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return false;
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fSet = true;
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if (vchPubKey.size() == 33)
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SetCompressedPubKey();
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return true;
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}
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std::vector<unsigned char> CKey::GetPubKey() const
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{
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int nSize = i2o_ECPublicKey(pkey, NULL);
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if (!nSize)
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throw key_error("CKey::GetPubKey() : i2o_ECPublicKey failed");
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std::vector<unsigned char> vchPubKey(nSize, 0);
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unsigned char* pbegin = &vchPubKey[0];
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if (i2o_ECPublicKey(pkey, &pbegin) != nSize)
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throw key_error("CKey::GetPubKey() : i2o_ECPublicKey returned unexpected size");
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return vchPubKey;
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}
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bool CKey::Sign(uint256 hash, std::vector<unsigned char>& vchSig)
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{
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unsigned int nSize = ECDSA_size(pkey);
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vchSig.resize(nSize); // Make sure it is big enough
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if (!ECDSA_sign(0, (unsigned char*)&hash, sizeof(hash), &vchSig[0], &nSize, pkey))
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{
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vchSig.clear();
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return false;
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}
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vchSig.resize(nSize); // Shrink to fit actual size
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return true;
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}
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// create a compact signature (65 bytes), which allows reconstructing the used public key
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// The format is one header byte, followed by two times 32 bytes for the serialized r and s values.
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// The header byte: 0x1B = first key with even y, 0x1C = first key with odd y,
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// 0x1D = second key with even y, 0x1E = second key with odd y
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bool CKey::SignCompact(uint256 hash, std::vector<unsigned char>& vchSig)
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{
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bool fOk = false;
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ECDSA_SIG *sig = ECDSA_do_sign((unsigned char*)&hash, sizeof(hash), pkey);
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if (sig==NULL)
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return false;
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vchSig.clear();
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vchSig.resize(65,0);
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int nBitsR = BN_num_bits(sig->r);
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int nBitsS = BN_num_bits(sig->s);
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if (nBitsR <= 256 && nBitsS <= 256)
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{
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int nRecId = -1;
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for (int i=0; i<4; i++)
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{
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CKey keyRec;
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keyRec.fSet = true;
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if (fCompressedPubKey)
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keyRec.SetCompressedPubKey();
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if (ECDSA_SIG_recover_key_GFp(keyRec.pkey, sig, (unsigned char*)&hash, sizeof(hash), i, 1) == 1)
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if (keyRec.GetPubKey() == this->GetPubKey())
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{
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nRecId = i;
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break;
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}
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}
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if (nRecId == -1)
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throw key_error("CKey::SignCompact() : unable to construct recoverable key");
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vchSig[0] = nRecId+27+(fCompressedPubKey ? 4 : 0);
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BN_bn2bin(sig->r,&vchSig[33-(nBitsR+7)/8]);
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BN_bn2bin(sig->s,&vchSig[65-(nBitsS+7)/8]);
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fOk = true;
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}
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ECDSA_SIG_free(sig);
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return fOk;
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}
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// reconstruct public key from a compact signature
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// This is only slightly more CPU intensive than just verifying it.
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// If this function succeeds, the recovered public key is guaranteed to be valid
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// (the signature is a valid signature of the given data for that key)
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bool CKey::SetCompactSignature(uint256 hash, const std::vector<unsigned char>& vchSig)
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{
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if (vchSig.size() != 65)
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return false;
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int nV = vchSig[0];
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if (nV<27 || nV>=35)
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return false;
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ECDSA_SIG *sig = ECDSA_SIG_new();
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BN_bin2bn(&vchSig[1],32,sig->r);
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BN_bin2bn(&vchSig[33],32,sig->s);
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EC_KEY_free(pkey);
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pkey = EC_KEY_new_by_curve_name(NID_secp256k1);
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if (nV >= 31)
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{
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SetCompressedPubKey();
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nV -= 4;
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}
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if (ECDSA_SIG_recover_key_GFp(pkey, sig, (unsigned char*)&hash, sizeof(hash), nV - 27, 0) == 1)
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{
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fSet = true;
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ECDSA_SIG_free(sig);
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return true;
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}
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return false;
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}
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bool CKey::Verify(uint256 hash, const std::vector<unsigned char>& vchSig)
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{
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// -1 = error, 0 = bad sig, 1 = good
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if (ECDSA_verify(0, (unsigned char*)&hash, sizeof(hash), &vchSig[0], vchSig.size(), pkey) != 1)
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return false;
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return true;
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}
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bool CKey::VerifyCompact(uint256 hash, const std::vector<unsigned char>& vchSig)
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{
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CKey key;
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if (!key.SetCompactSignature(hash, vchSig))
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return false;
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if (GetPubKey() != key.GetPubKey())
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return false;
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return true;
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}
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bool CKey::IsValid()
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{
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if (!fSet)
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return false;
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bool fCompr;
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CSecret secret = GetSecret(fCompr);
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CKey key2;
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key2.SetSecret(secret, fCompr);
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return GetPubKey() == key2.GetPubKey();
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}
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268
src/key.h
268
src/key.h
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@ -8,13 +8,11 @@
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#include <stdexcept>
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#include <vector>
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#include <openssl/ec.h>
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#include <openssl/ecdsa.h>
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#include <openssl/obj_mac.h>
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#include "allocators.h"
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#include "uint256.h"
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#include <openssl/ec.h> // for EC_KEY definition
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// secp160k1
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// const unsigned int PRIVATE_KEY_SIZE = 192;
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// const unsigned int PUBLIC_KEY_SIZE = 41;
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@ -38,9 +36,6 @@
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// see www.keylength.com
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// script supports up to 75 for single byte push
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int extern EC_KEY_regenerate_key(EC_KEY *eckey, BIGNUM *priv_key);
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int extern ECDSA_SIG_recover_key_GFp(EC_KEY *eckey, ECDSA_SIG *ecsig, const unsigned char *msg, int msglen, int recid, int check);
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class key_error : public std::runtime_error
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{
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public:
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@ -62,267 +57,50 @@ protected:
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bool fSet;
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bool fCompressedPubKey;
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void SetCompressedPubKey()
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{
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EC_KEY_set_conv_form(pkey, POINT_CONVERSION_COMPRESSED);
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fCompressedPubKey = true;
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}
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void SetCompressedPubKey();
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public:
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void Reset()
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{
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fCompressedPubKey = false;
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pkey = EC_KEY_new_by_curve_name(NID_secp256k1);
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if (pkey == NULL)
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throw key_error("CKey::CKey() : EC_KEY_new_by_curve_name failed");
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fSet = false;
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}
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void Reset();
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CKey()
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{
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Reset();
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}
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CKey();
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CKey(const CKey& b);
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CKey(const CKey& b)
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{
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pkey = EC_KEY_dup(b.pkey);
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if (pkey == NULL)
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throw key_error("CKey::CKey(const CKey&) : EC_KEY_dup failed");
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fSet = b.fSet;
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}
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CKey& operator=(const CKey& b);
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CKey& operator=(const CKey& b)
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{
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if (!EC_KEY_copy(pkey, b.pkey))
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throw key_error("CKey::operator=(const CKey&) : EC_KEY_copy failed");
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fSet = b.fSet;
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return (*this);
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}
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~CKey();
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~CKey()
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{
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EC_KEY_free(pkey);
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}
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bool IsNull() const;
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bool IsCompressed() const;
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bool IsNull() const
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{
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return !fSet;
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}
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void MakeNewKey(bool fCompressed);
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bool SetPrivKey(const CPrivKey& vchPrivKey);
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bool SetSecret(const CSecret& vchSecret, bool fCompressed = false);
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CSecret GetSecret(bool &fCompressed) const;
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CPrivKey GetPrivKey() const;
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bool SetPubKey(const std::vector<unsigned char>& vchPubKey);
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std::vector<unsigned char> GetPubKey() const;
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bool IsCompressed() const
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{
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return fCompressedPubKey;
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}
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void MakeNewKey(bool fCompressed)
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{
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if (!EC_KEY_generate_key(pkey))
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throw key_error("CKey::MakeNewKey() : EC_KEY_generate_key failed");
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if (fCompressed)
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SetCompressedPubKey();
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fSet = true;
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}
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bool SetPrivKey(const CPrivKey& vchPrivKey)
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{
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const unsigned char* pbegin = &vchPrivKey[0];
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if (!d2i_ECPrivateKey(&pkey, &pbegin, vchPrivKey.size()))
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return false;
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fSet = true;
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return true;
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}
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bool SetSecret(const CSecret& vchSecret, bool fCompressed = false)
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{
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EC_KEY_free(pkey);
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pkey = EC_KEY_new_by_curve_name(NID_secp256k1);
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if (pkey == NULL)
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throw key_error("CKey::SetSecret() : EC_KEY_new_by_curve_name failed");
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if (vchSecret.size() != 32)
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throw key_error("CKey::SetSecret() : secret must be 32 bytes");
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BIGNUM *bn = BN_bin2bn(&vchSecret[0],32,BN_new());
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if (bn == NULL)
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throw key_error("CKey::SetSecret() : BN_bin2bn failed");
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if (!EC_KEY_regenerate_key(pkey,bn))
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{
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BN_clear_free(bn);
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throw key_error("CKey::SetSecret() : EC_KEY_regenerate_key failed");
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}
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BN_clear_free(bn);
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fSet = true;
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if (fCompressed || fCompressedPubKey)
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SetCompressedPubKey();
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return true;
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}
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CSecret GetSecret(bool &fCompressed) const
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{
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CSecret vchRet;
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vchRet.resize(32);
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const BIGNUM *bn = EC_KEY_get0_private_key(pkey);
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int nBytes = BN_num_bytes(bn);
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if (bn == NULL)
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throw key_error("CKey::GetSecret() : EC_KEY_get0_private_key failed");
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int n=BN_bn2bin(bn,&vchRet[32 - nBytes]);
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if (n != nBytes)
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throw key_error("CKey::GetSecret(): BN_bn2bin failed");
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fCompressed = fCompressedPubKey;
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return vchRet;
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}
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CPrivKey GetPrivKey() const
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{
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int nSize = i2d_ECPrivateKey(pkey, NULL);
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if (!nSize)
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throw key_error("CKey::GetPrivKey() : i2d_ECPrivateKey failed");
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CPrivKey vchPrivKey(nSize, 0);
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unsigned char* pbegin = &vchPrivKey[0];
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if (i2d_ECPrivateKey(pkey, &pbegin) != nSize)
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throw key_error("CKey::GetPrivKey() : i2d_ECPrivateKey returned unexpected size");
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return vchPrivKey;
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}
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bool SetPubKey(const std::vector<unsigned char>& vchPubKey)
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{
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const unsigned char* pbegin = &vchPubKey[0];
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if (!o2i_ECPublicKey(&pkey, &pbegin, vchPubKey.size()))
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return false;
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fSet = true;
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if (vchPubKey.size() == 33)
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SetCompressedPubKey();
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return true;
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}
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std::vector<unsigned char> GetPubKey() const
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{
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int nSize = i2o_ECPublicKey(pkey, NULL);
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if (!nSize)
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throw key_error("CKey::GetPubKey() : i2o_ECPublicKey failed");
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std::vector<unsigned char> vchPubKey(nSize, 0);
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unsigned char* pbegin = &vchPubKey[0];
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if (i2o_ECPublicKey(pkey, &pbegin) != nSize)
|
||||
throw key_error("CKey::GetPubKey() : i2o_ECPublicKey returned unexpected size");
|
||||
return vchPubKey;
|
||||
}
|
||||
|
||||
bool Sign(uint256 hash, std::vector<unsigned char>& vchSig)
|
||||
{
|
||||
unsigned int nSize = ECDSA_size(pkey);
|
||||
vchSig.resize(nSize); // Make sure it is big enough
|
||||
if (!ECDSA_sign(0, (unsigned char*)&hash, sizeof(hash), &vchSig[0], &nSize, pkey))
|
||||
{
|
||||
vchSig.clear();
|
||||
return false;
|
||||
}
|
||||
vchSig.resize(nSize); // Shrink to fit actual size
|
||||
return true;
|
||||
}
|
||||
bool Sign(uint256 hash, std::vector<unsigned char>& vchSig);
|
||||
|
||||
// create a compact signature (65 bytes), which allows reconstructing the used public key
|
||||
// The format is one header byte, followed by two times 32 bytes for the serialized r and s values.
|
||||
// The header byte: 0x1B = first key with even y, 0x1C = first key with odd y,
|
||||
// 0x1D = second key with even y, 0x1E = second key with odd y
|
||||
bool SignCompact(uint256 hash, std::vector<unsigned char>& vchSig)
|
||||
{
|
||||
bool fOk = false;
|
||||
ECDSA_SIG *sig = ECDSA_do_sign((unsigned char*)&hash, sizeof(hash), pkey);
|
||||
if (sig==NULL)
|
||||
return false;
|
||||
vchSig.clear();
|
||||
vchSig.resize(65,0);
|
||||
int nBitsR = BN_num_bits(sig->r);
|
||||
int nBitsS = BN_num_bits(sig->s);
|
||||
if (nBitsR <= 256 && nBitsS <= 256)
|
||||
{
|
||||
int nRecId = -1;
|
||||
for (int i=0; i<4; i++)
|
||||
{
|
||||
CKey keyRec;
|
||||
keyRec.fSet = true;
|
||||
if (fCompressedPubKey)
|
||||
keyRec.SetCompressedPubKey();
|
||||
if (ECDSA_SIG_recover_key_GFp(keyRec.pkey, sig, (unsigned char*)&hash, sizeof(hash), i, 1) == 1)
|
||||
if (keyRec.GetPubKey() == this->GetPubKey())
|
||||
{
|
||||
nRecId = i;
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
if (nRecId == -1)
|
||||
throw key_error("CKey::SignCompact() : unable to construct recoverable key");
|
||||
|
||||
vchSig[0] = nRecId+27+(fCompressedPubKey ? 4 : 0);
|
||||
BN_bn2bin(sig->r,&vchSig[33-(nBitsR+7)/8]);
|
||||
BN_bn2bin(sig->s,&vchSig[65-(nBitsS+7)/8]);
|
||||
fOk = true;
|
||||
}
|
||||
ECDSA_SIG_free(sig);
|
||||
return fOk;
|
||||
}
|
||||
bool SignCompact(uint256 hash, std::vector<unsigned char>& vchSig);
|
||||
|
||||
// reconstruct public key from a compact signature
|
||||
// This is only slightly more CPU intensive than just verifying it.
|
||||
// If this function succeeds, the recovered public key is guaranteed to be valid
|
||||
// (the signature is a valid signature of the given data for that key)
|
||||
bool SetCompactSignature(uint256 hash, const std::vector<unsigned char>& vchSig)
|
||||
{
|
||||
if (vchSig.size() != 65)
|
||||
return false;
|
||||
int nV = vchSig[0];
|
||||
if (nV<27 || nV>=35)
|
||||
return false;
|
||||
ECDSA_SIG *sig = ECDSA_SIG_new();
|
||||
BN_bin2bn(&vchSig[1],32,sig->r);
|
||||
BN_bin2bn(&vchSig[33],32,sig->s);
|
||||
bool SetCompactSignature(uint256 hash, const std::vector<unsigned char>& vchSig);
|
||||
|
||||
EC_KEY_free(pkey);
|
||||
pkey = EC_KEY_new_by_curve_name(NID_secp256k1);
|
||||
if (nV >= 31)
|
||||
{
|
||||
SetCompressedPubKey();
|
||||
nV -= 4;
|
||||
}
|
||||
if (ECDSA_SIG_recover_key_GFp(pkey, sig, (unsigned char*)&hash, sizeof(hash), nV - 27, 0) == 1)
|
||||
{
|
||||
fSet = true;
|
||||
ECDSA_SIG_free(sig);
|
||||
return true;
|
||||
}
|
||||
return false;
|
||||
}
|
||||
|
||||
bool Verify(uint256 hash, const std::vector<unsigned char>& 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;
|
||||
}
|
||||
bool Verify(uint256 hash, const std::vector<unsigned char>& vchSig);
|
||||
|
||||
// Verify a compact signature
|
||||
bool VerifyCompact(uint256 hash, const std::vector<unsigned char>& vchSig)
|
||||
{
|
||||
CKey key;
|
||||
if (!key.SetCompactSignature(hash, vchSig))
|
||||
return false;
|
||||
if (GetPubKey() != key.GetPubKey())
|
||||
return false;
|
||||
return true;
|
||||
}
|
||||
bool VerifyCompact(uint256 hash, const std::vector<unsigned char>& vchSig);
|
||||
|
||||
bool IsValid()
|
||||
{
|
||||
if (!fSet)
|
||||
return false;
|
||||
|
||||
bool fCompr;
|
||||
CSecret secret = GetSecret(fCompr);
|
||||
CKey key2;
|
||||
key2.SetSecret(secret, fCompr);
|
||||
return GetPubKey() == key2.GetPubKey();
|
||||
}
|
||||
bool IsValid();
|
||||
};
|
||||
|
||||
#endif
|
||||
|
|
|
|||
Loading…
Reference in a new issue