// Copyright (c) 2009-2012 The Bitcoin developers
// Distributed under the MIT/X11 software license, see the accompanying
-// file license.txt or http://www.opensource.org/licenses/mit-license.php.
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <map>
#include <openssl/ecdsa.h>
#include <openssl/obj_mac.h>
+#include <openssl/ssl.h>
#include "key.h"
+#include "base58.h"
// Generate a private key from just the secret parameter
int EC_KEY_regenerate_key(EC_KEY *eckey, BIGNUM *priv_key)
// Perform ECDSA key recovery (see SEC1 4.1.6) for curves over (mod p)-fields
// recid selects which key is recovered
-// if check is nonzero, additional checks are performed
+// if check is non-zero, additional checks are performed
int ECDSA_SIG_recover_key_GFp(EC_KEY *eckey, ECDSA_SIG *ecsig, const unsigned char *msg, int msglen, int recid, int check)
{
if (!eckey) return 0;
return ret;
}
+int CompareBigEndian(const unsigned char *c1, size_t c1len, const unsigned char *c2, size_t c2len) {
+ while (c1len > c2len) {
+ if (*c1)
+ return 1;
+ c1++;
+ c1len--;
+ }
+ while (c2len > c1len) {
+ if (*c2)
+ return -1;
+ c2++;
+ c2len--;
+ }
+ while (c1len > 0) {
+ if (*c1 > *c2)
+ return 1;
+ if (*c2 > *c1)
+ return -1;
+ c1++;
+ c2++;
+ c1len--;
+ }
+ return 0;
+}
+
+// Order of secp256k1's generator minus 1.
+const unsigned char vchMaxModOrder[32] = {
+ 0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
+ 0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFE,
+ 0xBA,0xAE,0xDC,0xE6,0xAF,0x48,0xA0,0x3B,
+ 0xBF,0xD2,0x5E,0x8C,0xD0,0x36,0x41,0x40
+};
+
+// Half of the order of secp256k1's generator minus 1.
+const unsigned char vchMaxModHalfOrder[32] = {
+ 0x7F,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
+ 0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
+ 0x5D,0x57,0x6E,0x73,0x57,0xA4,0x50,0x1D,
+ 0xDF,0xE9,0x2F,0x46,0x68,0x1B,0x20,0xA0
+};
+
+const unsigned char *vchZero = NULL;
+
+
+
void CKey::SetCompressedPubKey()
{
EC_KEY_set_conv_form(pkey, POINT_CONVERSION_COMPRESSED);
void CKey::Reset()
{
fCompressedPubKey = false;
+ if (pkey != NULL)
+ EC_KEY_free(pkey);
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::CKey()
{
+ pkey = NULL;
Reset();
}
if (pkey == NULL)
throw key_error("CKey::CKey(const CKey&) : EC_KEY_dup failed");
fSet = b.fSet;
+ fCompressedPubKey = b.fCompressedPubKey;
}
CKey& CKey::operator=(const CKey& b)
if (!EC_KEY_copy(pkey, b.pkey))
throw key_error("CKey::operator=(const CKey&) : EC_KEY_copy failed");
fSet = b.fSet;
+ fCompressedPubKey = b.fCompressedPubKey;
return (*this);
}
return fCompressedPubKey;
}
+bool CKey::CheckSignatureElement(const unsigned char *vch, int len, bool half) {
+ return CompareBigEndian(vch, len, vchZero, 0) > 0 &&
+ CompareBigEndian(vch, len, half ? vchMaxModHalfOrder : vchMaxModOrder, 32) <= 0;
+}
+
+bool CKey::ReserealizeSignature(std::vector<unsigned char>& vchSig)
+{
+ if (vchSig.empty())
+ return false;
+
+ unsigned char *pos = &vchSig[0];
+ ECDSA_SIG *sig = d2i_ECDSA_SIG(NULL, (const unsigned char **)&pos, vchSig.size());
+ if (sig == NULL)
+ return false;
+
+ bool ret = false;
+ int nSize = i2d_ECDSA_SIG(sig, NULL);
+ if (nSize > 0) {
+ vchSig.resize(nSize); // grow or shrink as needed
+
+ pos = &vchSig[0];
+ i2d_ECDSA_SIG(sig, &pos);
+
+ ret = true;
+ }
+
+ ECDSA_SIG_free(sig);
+
+ return ret;
+}
+
void CKey::MakeNewKey(bool fCompressed)
{
if (!EC_KEY_generate_key(pkey))
bool CKey::SetPrivKey(const CPrivKey& vchPrivKey)
{
const unsigned char* pbegin = &vchPrivKey[0];
- if (!d2i_ECPrivateKey(&pkey, &pbegin, vchPrivKey.size()))
- return false;
- fSet = true;
- return true;
+ if (d2i_ECPrivateKey(&pkey, &pbegin, vchPrivKey.size()))
+ {
+ // In testing, d2i_ECPrivateKey can return true
+ // but fill in pkey with a key that fails
+ // EC_KEY_check_key, so:
+ if (EC_KEY_check_key(pkey))
+ {
+ fSet = true;
+ return true;
+ }
+ }
+ // If vchPrivKey data is bad d2i_ECPrivateKey() can
+ // leave pkey in a state where calling EC_KEY_free()
+ // crashes. To avoid that, set pkey to NULL and
+ // leak the memory (a leak is better than a crash)
+ pkey = NULL;
+ Reset();
+ return false;
}
bool CKey::SetSecret(const CSecret& vchSecret, bool fCompressed)
return vchPrivKey;
}
-bool CKey::SetPubKey(const std::vector<unsigned char>& vchPubKey)
+bool CKey::SetPubKey(const CPubKey& vchPubKey)
{
- const unsigned char* pbegin = &vchPubKey[0];
- if (!o2i_ECPublicKey(&pkey, &pbegin, vchPubKey.size()))
- return false;
- fSet = true;
- if (vchPubKey.size() == 33)
- SetCompressedPubKey();
- return true;
+ const unsigned char* pbegin = &vchPubKey.vchPubKey[0];
+ if (o2i_ECPublicKey(&pkey, &pbegin, vchPubKey.vchPubKey.size()))
+ {
+ fSet = true;
+ if (vchPubKey.vchPubKey.size() == 33)
+ SetCompressedPubKey();
+ return true;
+ }
+ pkey = NULL;
+ Reset();
+ return false;
}
-std::vector<unsigned char> CKey::GetPubKey() const
+CPubKey CKey::GetPubKey() const
{
int nSize = i2o_ECPublicKey(pkey, NULL);
if (!nSize)
unsigned char* pbegin = &vchPubKey[0];
if (i2o_ECPublicKey(pkey, &pbegin) != nSize)
throw key_error("CKey::GetPubKey() : i2o_ECPublicKey returned unexpected size");
- return vchPubKey;
+ return CPubKey(vchPubKey);
}
bool CKey::Sign(uint256 hash, std::vector<unsigned char>& vchSig)
{
+ vchSig.clear();
+ ECDSA_SIG *sig = ECDSA_do_sign((unsigned char*)&hash, sizeof(hash), pkey);
+ if (sig==NULL)
+ return false;
+ const EC_GROUP *group = EC_KEY_get0_group(pkey);
+ CBigNum order, halforder;
+ EC_GROUP_get_order(group, &order, NULL);
+ BN_rshift1(&halforder, &order);
+ // enforce low S values, by negating the value (modulo the order) if above order/2.
+ if (BN_cmp(sig->s, &halforder) > 0) {
+ BN_sub(sig->s, &order, sig->s);
+ }
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))
- {
+ unsigned char *pos = &vchSig[0];
+ nSize = i2d_ECDSA_SIG(sig, &pos);
+ ECDSA_SIG_free(sig);
+ vchSig.resize(nSize); // Shrink to fit actual size
+ // Testing our new signature
+ if (ECDSA_verify(0, (unsigned char*)&hash, sizeof(hash), &vchSig[0], vchSig.size(), pkey) != 1) {
vchSig.clear();
return false;
}
- vchSig.resize(nSize); // Shrink to fit actual size
return true;
}
ECDSA_SIG *sig = ECDSA_do_sign((unsigned char*)&hash, sizeof(hash), pkey);
if (sig==NULL)
return false;
+ const EC_GROUP *group = EC_KEY_get0_group(pkey);
+ CBigNum order, halforder;
+ EC_GROUP_get_order(group, &order, NULL);
+ BN_rshift1(&halforder, &order);
+ // enforce low S values, by negating the value (modulo the order) if above order/2.
+ if (BN_cmp(sig->s, &halforder) > 0) {
+ BN_sub(sig->s, &order, sig->s);
+ }
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++)
+ int8_t nRecId = -1;
+ for (int8_t i=0; i<4; i++)
{
CKey keyRec;
keyRec.fSet = true;
}
if (nRecId == -1)
+ {
+ ECDSA_SIG_free(sig);
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]);
ECDSA_SIG_free(sig);
return true;
}
+ ECDSA_SIG_free(sig);
return false;
}
bool CKey::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)
+ if (vchSig.empty())
return false;
- return true;
+
+ // New versions of OpenSSL will reject non-canonical DER signatures. de/re-serialize first.
+ unsigned char *norm_der = NULL;
+ ECDSA_SIG *norm_sig = ECDSA_SIG_new();
+ const unsigned char* sigptr = &vchSig[0];
+ assert(norm_sig);
+ if (d2i_ECDSA_SIG(&norm_sig, &sigptr, vchSig.size()) == NULL)
+ {
+ /* As of OpenSSL 1.0.0p d2i_ECDSA_SIG frees and nulls the pointer on
+ * error. But OpenSSL's own use of this function redundantly frees the
+ * result. As ECDSA_SIG_free(NULL) is a no-op, and in the absence of a
+ * clear contract for the function behaving the same way is more
+ * conservative.
+ */
+ ECDSA_SIG_free(norm_sig);
+ return false;
+ }
+ int derlen = i2d_ECDSA_SIG(norm_sig, &norm_der);
+ ECDSA_SIG_free(norm_sig);
+ if (derlen <= 0)
+ return false;
+
+ // -1 = error, 0 = bad sig, 1 = good
+ bool ret = ECDSA_verify(0, (unsigned char*)&hash, sizeof(hash), norm_der, derlen, pkey) == 1;
+ OPENSSL_free(norm_der);
+ return ret;
}
bool CKey::VerifyCompact(uint256 hash, const std::vector<unsigned char>& vchSig)
return false;
if (GetPubKey() != key.GetPubKey())
return false;
+
return true;
}
if (!fSet)
return false;
+ if (!EC_KEY_check_key(pkey))
+ return false;
+
bool fCompr;
CSecret secret = GetSecret(fCompr);
CKey key2;
key2.SetSecret(secret, fCompr);
return GetPubKey() == key2.GetPubKey();
}
+
+CPoint::CPoint()
+{
+ std::string err;
+ group = NULL;
+ point = NULL;
+ ctx = NULL;
+
+ group = EC_GROUP_new_by_curve_name(NID_secp256k1);
+ if (!group) {
+ err = "EC_KEY_new_by_curve_name failed.";
+ goto finish;
+ }
+
+ point = EC_POINT_new(group);
+ if (!point) {
+ err = "EC_POINT_new failed.";
+ goto finish;
+ }
+
+ ctx = BN_CTX_new();
+ if (!ctx) {
+ err = "BN_CTX_new failed.";
+ goto finish;
+ }
+
+ return;
+
+finish:
+ if (group) EC_GROUP_free(group);
+ if (point) EC_POINT_free(point);
+ throw std::runtime_error(std::string("CPoint::CPoint() : - ") + err);
+}
+
+bool CPoint::operator!=(const CPoint &a)
+{
+ if (EC_POINT_cmp(group, point, a.point, ctx) != 0)
+ return true;
+ return false;
+}
+CPoint::~CPoint()
+{
+ if (point) EC_POINT_free(point);
+ if (group) EC_GROUP_free(group);
+ if (ctx) BN_CTX_free(ctx);
+}
+
+// Initialize from octets stream
+bool CPoint::setBytes(const std::vector<unsigned char> &vchBytes)
+{
+ if (!EC_POINT_oct2point(group, point, &vchBytes[0], vchBytes.size(), ctx)) {
+ return false;
+ }
+ return true;
+}
+
+// Serialize to octets stream
+bool CPoint::getBytes(std::vector<unsigned char> &vchBytes)
+{
+ unsigned int nSize = EC_POINT_point2oct(group, point, POINT_CONVERSION_COMPRESSED, NULL, 0, ctx);
+ vchBytes.resize(nSize);
+ if (!(nSize == EC_POINT_point2oct(group, point, POINT_CONVERSION_COMPRESSED, &vchBytes[0], nSize, ctx))) {
+ return false;
+ }
+ return true;
+}
+
+// ECC multiplication by specified multiplier
+bool CPoint::ECMUL(const CBigNum &bnMultiplier)
+{
+ if (!EC_POINT_mul(group, point, NULL, point, &bnMultiplier, NULL)) {
+ printf("CPoint::ECMUL() : EC_POINT_mul failed");
+ return false;
+ }
+
+ return true;
+}
+
+// Calculate G*m + q
+bool CPoint::ECMULGEN(const CBigNum &bnMultiplier, const CPoint &qPoint)
+{
+ if (!EC_POINT_mul(group, point, &bnMultiplier, qPoint.point, BN_value_one(), NULL)) {
+ printf("CPoint::ECMULGEN() : EC_POINT_mul failed.");
+ return false;
+ }
+
+ return true;
+}
+
+// CMalleablePubKey
+
+void CMalleablePubKey::GetVariant(CPubKey &R, CPubKey &vchPubKeyVariant)
+{
+ EC_KEY *eckey = NULL;
+ eckey = EC_KEY_new_by_curve_name(NID_secp256k1);
+ if (eckey == NULL) {
+ throw key_error("CMalleablePubKey::GetVariant() : EC_KEY_new_by_curve_name failed");
+ }
+
+ // Use standard key generation function to get r and R values.
+ //
+ // r will be presented by private key;
+ // R is ECDSA public key which calculated as G*r
+ if (!EC_KEY_generate_key(eckey)) {
+ throw key_error("CMalleablePubKey::GetVariant() : EC_KEY_generate_key failed");
+ }
+
+ EC_KEY_set_conv_form(eckey, POINT_CONVERSION_COMPRESSED);
+
+ int nSize = i2o_ECPublicKey(eckey, NULL);
+ if (!nSize) {
+ throw key_error("CMalleablePubKey::GetVariant() : i2o_ECPublicKey failed");
+ }
+
+ std::vector<unsigned char> vchPubKey(nSize, 0);
+ unsigned char* pbegin_R = &vchPubKey[0];
+
+ if (i2o_ECPublicKey(eckey, &pbegin_R) != nSize) {
+ throw key_error("CMalleablePubKey::GetVariant() : i2o_ECPublicKey returned unexpected size");
+ }
+
+ // R = G*r
+ R = CPubKey(vchPubKey);
+
+ // OpenSSL BIGNUM representation of r value
+ CBigNum bnr;
+ bnr = *(CBigNum*) EC_KEY_get0_private_key(eckey);
+ EC_KEY_free(eckey);
+
+ CPoint point;
+ if (!point.setBytes(pubKeyL.Raw())) {
+ throw key_error("CMalleablePubKey::GetVariant() : Unable to decode L value");
+ }
+
+ // Calculate L*r
+ point.ECMUL(bnr);
+
+ std::vector<unsigned char> vchLr;
+ if (!point.getBytes(vchLr)) {
+ throw key_error("CMalleablePubKey::GetVariant() : Unable to convert Lr value");
+ }
+
+ // Calculate Hash(L*r) and then get a BIGNUM representation of hash value.
+ CBigNum bnHash;
+ bnHash.setuint160(Hash160(vchLr));
+
+ CPoint pointH;
+ pointH.setBytes(pubKeyH.Raw());
+
+ CPoint P;
+ // Calculate P = Hash(L*r)*G + H
+ P.ECMULGEN(bnHash, pointH);
+
+ if (P.IsInfinity()) {
+ throw key_error("CMalleablePubKey::GetVariant() : P is infinity");
+ }
+
+ std::vector<unsigned char> vchResult;
+ P.getBytes(vchResult);
+
+ vchPubKeyVariant = CPubKey(vchResult);
+}
+
+std::string CMalleablePubKey::ToString()
+{
+ CDataStream ssKey(SER_NETWORK, PROTOCOL_VERSION);
+ ssKey << *this;
+ std::vector<unsigned char> vch(ssKey.begin(), ssKey.end());
+
+ return EncodeBase58Check(vch);
+}
+
+bool CMalleablePubKey::SetString(const std::string& strMalleablePubKey)
+{
+ std::vector<unsigned char> vchTemp;
+ if (!DecodeBase58Check(strMalleablePubKey, vchTemp)) {
+ throw key_error("CMalleablePubKey::SetString() : Provided key data seems corrupted.");
+ }
+
+ CDataStream ssKey(vchTemp, SER_NETWORK, PROTOCOL_VERSION);
+ ssKey >> *this;
+
+ return IsValid();
+}
+
+bool CMalleablePubKey::operator==(const CMalleablePubKey &b)
+{
+ return (nVersion == b.nVersion &&
+ pubKeyL == b.pubKeyL &&
+ pubKeyH == b.pubKeyH);
+}
+
+
+// CMalleableKey
+
+void CMalleableKey::Reset()
+{
+ vchSecretL.clear();
+ vchSecretH.clear();
+
+ nVersion = 0;
+}
+
+void CMalleableKey::MakeNewKeys()
+{
+ CKey L, H;
+ bool fCompressed = true;
+
+ L.MakeNewKey(true);
+ H.MakeNewKey(true);
+
+ vchSecretL = L.GetSecret(fCompressed);
+ vchSecretH = H.GetSecret(fCompressed);
+
+ nVersion = CURRENT_VERSION;
+}
+
+CMalleableKey::CMalleableKey()
+{
+ Reset();
+}
+
+CMalleableKey::CMalleableKey(const CMalleableKey &b)
+{
+ SetSecrets(b.vchSecretL, b.vchSecretH);
+}
+
+CMalleableKey::CMalleableKey(const CSecret &L, const CSecret &H)
+{
+ SetSecrets(L, H);
+}
+
+CMalleableKey& CMalleableKey::operator=(const CMalleableKey &b)
+{
+ SetSecrets(b.vchSecretL, b.vchSecretH);
+
+ return (*this);
+}
+
+CMalleableKey::~CMalleableKey()
+{
+}
+
+bool CMalleableKey::IsNull() const
+{
+ return nVersion != CURRENT_VERSION;
+}
+
+bool CMalleableKey::SetSecrets(const CSecret &pvchSecretL, const CSecret &pvchSecretH)
+{
+ Reset();
+ CKey L, H;
+
+ if (!L.SetSecret(pvchSecretL, true) || !H.SetSecret(pvchSecretH, true))
+ {
+ nVersion = 0;
+ return false;
+ }
+
+ vchSecretL = pvchSecretL;
+ vchSecretH = pvchSecretH;
+ nVersion = CURRENT_VERSION;
+
+ return true;
+}
+
+void CMalleableKey::GetSecrets(CSecret &pvchSecretL, CSecret &pvchSecretH) const
+{
+ pvchSecretL = vchSecretL;
+ pvchSecretH = vchSecretH;
+}
+
+CMalleablePubKey CMalleableKey::GetMalleablePubKey() const
+{
+ CKey L, H;
+ L.SetSecret(vchSecretL, true);
+ H.SetSecret(vchSecretH, true);
+
+ std::vector<unsigned char> vchPubKeyL = L.GetPubKey().Raw();
+ std::vector<unsigned char> vchPubKeyH = H.GetPubKey().Raw();
+
+ return CMalleablePubKey(vchPubKeyL, vchPubKeyH);
+}
+
+// Check ownership
+bool CMalleableKey::CheckKeyVariant(const CPubKey &R, const CPubKey &vchPubKeyVariant)
+{
+ if (IsNull()) {
+ throw key_error("CMalleableKey::CheckKeyVariant() : Attempting to run on NULL key object.");
+ }
+
+ if (!R.IsValid()) {
+ throw key_error("CMalleableKey::CheckKeyVariant() : R is invalid");
+ }
+
+ if (!vchPubKeyVariant.IsValid()) {
+ throw key_error("CMalleableKey::CheckKeyVariant() : public key variant is invalid");
+ }
+
+ CPoint point_R;
+ if (!point_R.setBytes(R.Raw())) {
+ throw key_error("CMalleableKey::CheckKeyVariant() : Unable to decode R value");
+ }
+
+ CKey H;
+ H.SetSecret(vchSecretH, true);
+ std::vector<unsigned char> vchPubKeyH = H.GetPubKey().Raw();
+
+ CPoint point_H;
+ if (!point_H.setBytes(vchPubKeyH)) {
+ throw key_error("CMalleableKey::CheckKeyVariant() : Unable to decode H value");
+ }
+
+ CPoint point_P;
+ if (!point_P.setBytes(vchPubKeyVariant.Raw())) {
+ throw key_error("CMalleableKey::CheckKeyVariant() : Unable to decode P value");
+ }
+
+ // Infinity points are senseless
+ if (point_P.IsInfinity()) {
+ throw key_error("CMalleableKey::CheckKeyVariant() : P is infinity");
+ }
+
+ CBigNum bnl;
+ bnl.setBytes(std::vector<unsigned char>(vchSecretL.begin(), vchSecretL.end()));
+
+ point_R.ECMUL(bnl);
+
+ std::vector<unsigned char> vchRl;
+ if (!point_R.getBytes(vchRl)) {
+ throw key_error("CMalleableKey::CheckKeyVariant() : Unable to convert Rl value");
+ }
+
+ // Calculate Hash(R*l)
+ CBigNum bnHash;
+ bnHash.setuint160(Hash160(vchRl));
+
+ CPoint point_Ps;
+ // Calculate Ps = Hash(L*r)*G + H
+ point_Ps.ECMULGEN(bnHash, point_H);
+
+ // Infinity points are senseless
+ if (point_Ps.IsInfinity()) {
+ throw key_error("CMalleableKey::CheckKeyVariant() : Ps is infinity");
+ }
+
+ // Check ownership
+ if (point_Ps != point_P) {
+ return false;
+ }
+
+ return true;
+}
+
+// Check ownership and restore private key
+bool CMalleableKey::CheckKeyVariant(const CPubKey &R, const CPubKey &vchPubKeyVariant, CKey &privKeyVariant)
+{
+ if (IsNull()) {
+ throw key_error("CMalleableKey::CheckKeyVariant() : Attempting to run on NULL key object.");
+ }
+
+ if (!R.IsValid()) {
+ throw key_error("CMalleableKey::CheckKeyVariant() : R is invalid");
+ }
+
+ if (!vchPubKeyVariant.IsValid()) {
+ throw key_error("CMalleableKey::CheckKeyVariant() : public key variant is invalid");
+ }
+
+ CPoint point_R;
+ if (!point_R.setBytes(R.Raw())) {
+ throw key_error("CMalleableKey::CheckKeyVariant() : Unable to decode R value");
+ }
+
+ CKey H;
+ H.SetSecret(vchSecretH, true);
+ std::vector<unsigned char> vchPubKeyH = H.GetPubKey().Raw();
+
+ CPoint point_H;
+ if (!point_H.setBytes(vchPubKeyH)) {
+ throw key_error("CMalleableKey::CheckKeyVariant() : Unable to decode H value");
+ }
+
+ CPoint point_P;
+ if (!point_P.setBytes(vchPubKeyVariant.Raw())) {
+ throw key_error("CMalleableKey::CheckKeyVariant() : Unable to decode P value");
+ }
+
+ // Infinity points are senseless
+ if (point_P.IsInfinity()) {
+ throw key_error("CMalleableKey::CheckKeyVariant() : P is infinity");
+ }
+
+ CBigNum bnl;
+ bnl.setBytes(std::vector<unsigned char>(vchSecretL.begin(), vchSecretL.end()));
+
+ point_R.ECMUL(bnl);
+
+ std::vector<unsigned char> vchRl;
+ if (!point_R.getBytes(vchRl)) {
+ throw key_error("CMalleableKey::CheckKeyVariant() : Unable to convert Rl value");
+ }
+
+ // Calculate Hash(R*l)
+ CBigNum bnHash;
+ bnHash.setuint160(Hash160(vchRl));
+
+ CPoint point_Ps;
+ // Calculate Ps = Hash(L*r)*G + H
+ point_Ps.ECMULGEN(bnHash, point_H);
+
+ // Infinity points are senseless
+ if (point_Ps.IsInfinity()) {
+ throw key_error("CMalleableKey::CheckKeyVariant() : Ps is infinity");
+ }
+
+ // Check ownership
+ if (point_Ps != point_P) {
+ return false;
+ }
+
+ // OpenSSL BIGNUM representation of the second private key from (l, h) pair
+ CBigNum bnh;
+ bnh.setBytes(std::vector<unsigned char>(vchSecretH.begin(), vchSecretH.end()));
+
+ // Calculate p = Hash(R*l) + h
+ CBigNum bnp = bnHash + bnh;
+
+ std::vector<unsigned char> vchp = bnp.getBytes();
+ privKeyVariant.SetSecret(CSecret(vchp.begin(), vchp.end()), true);
+
+ return true;
+}
+
+std::string CMalleableKey::ToString()
+{
+ CDataStream ssKey(SER_NETWORK, PROTOCOL_VERSION);
+ ssKey << *this;
+ std::vector<unsigned char> vch(ssKey.begin(), ssKey.end());
+
+ return EncodeBase58Check(vch);
+}
+
+bool CMalleableKey::SetString(const std::string& strMutableKey)
+{
+ std::vector<unsigned char> vchTemp;
+ if (!DecodeBase58Check(strMutableKey, vchTemp)) {
+ throw key_error("CMalleableKey::SetString() : Provided key data seems corrupted.");
+ }
+
+ CDataStream ssKey(vchTemp, SER_NETWORK, PROTOCOL_VERSION);
+ ssKey >> *this;
+
+ return IsNull();
+}
+
+// CMalleableKeyView
+
+CMalleableKeyView::CMalleableKeyView(const CMalleableKey &b)
+{
+ assert(b.nVersion == CURRENT_VERSION);
+ vchSecretL = b.vchSecretL;
+
+ CKey H;
+ H.SetSecret(b.vchSecretH, true);
+ vchPubKeyH = H.GetPubKey().Raw();
+}
+
+CMalleableKeyView::CMalleableKeyView(const CSecret &L, const CPubKey &pvchPubKeyH)
+{
+ vchSecretL = L;
+ vchPubKeyH = pvchPubKeyH.Raw();
+}
+
+CMalleableKeyView& CMalleableKeyView::operator=(const CMalleableKey &b)
+{
+ assert(b.nVersion == CURRENT_VERSION);
+ vchSecretL = b.vchSecretL;
+
+ CKey H;
+ H.SetSecret(b.vchSecretH, true);
+ vchPubKeyH = H.GetPubKey().Raw();
+
+ return (*this);
+}
+
+CMalleableKeyView::~CMalleableKeyView()
+{
+}
+
+CMalleablePubKey CMalleableKeyView::GetMalleablePubKey() const
+{
+ CKey keyL;
+ keyL.SetSecret(vchSecretL, true);
+ return CMalleablePubKey(keyL.GetPubKey(), vchPubKeyH);
+}
+
+// Check ownership
+bool CMalleableKeyView::CheckKeyVariant(const CPubKey &R, const CPubKey &vchPubKeyVariant)
+{
+ if (!R.IsValid()) {
+ throw key_error("CMalleableKeyView::CheckKeyVariant() : R is invalid");
+ }
+
+ if (!vchPubKeyVariant.IsValid()) {
+ throw key_error("CMalleableKeyView::CheckKeyVariant() : public key variant is invalid");
+ }
+
+ CPoint point_R;
+ if (!point_R.setBytes(R.Raw())) {
+ throw key_error("CMalleableKeyView::CheckKeyVariant() : Unable to decode R value");
+ }
+
+ CPoint point_H;
+ if (!point_H.setBytes(vchPubKeyH)) {
+ throw key_error("CMalleableKeyView::CheckKeyVariant() : Unable to decode H value");
+ }
+
+ CPoint point_P;
+ if (!point_P.setBytes(vchPubKeyVariant.Raw())) {
+ throw key_error("CMalleableKeyView::CheckKeyVariant() : Unable to decode P value");
+ }
+
+ // Infinity points are senseless
+ if (point_P.IsInfinity()) {
+ throw key_error("CMalleableKeyView::CheckKeyVariant() : P is infinity");
+ }
+
+ CBigNum bnl;
+ bnl.setBytes(std::vector<unsigned char>(vchSecretL.begin(), vchSecretL.end()));
+
+ point_R.ECMUL(bnl);
+
+ std::vector<unsigned char> vchRl;
+ if (!point_R.getBytes(vchRl)) {
+ throw key_error("CMalleableKeyView::CheckKeyVariant() : Unable to convert Rl value");
+ }
+
+ // Calculate Hash(R*l)
+ CBigNum bnHash;
+ bnHash.setuint160(Hash160(vchRl));
+
+ CPoint point_Ps;
+ // Calculate Ps = Hash(L*r)*G + H
+ point_Ps.ECMULGEN(bnHash, point_H);
+
+ // Infinity points are senseless
+ if (point_Ps.IsInfinity()) {
+ throw key_error("CMalleableKeyView::CheckKeyVariant() : Ps is infinity");
+ }
+
+ // Check ownership
+ if (point_Ps != point_P) {
+ return false;
+ }
+
+ return true;
+}
+
+//// Asymmetric encryption
+
+bool CPubKey::EncryptData(const std::vector<unsigned char>& data, std::vector<unsigned char>& encrypted)
+{
+ // TODO
+
+ return true;
+}
+
+bool CKey::DecryptData(const std::vector<unsigned char>& encrypted, std::vector<unsigned char>& data)
+{
+ // TODO
+
+ return true;
+}
git://git.novaco.in / novacoin.git / blobdiff