1 // Copyright (c) 2009-2012 The Bitcoin developers
2 // Distributed under the MIT/X11 software license, see the accompanying
3 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
7 #include <openssl/ecdsa.h>
8 #include <openssl/obj_mac.h>
9 #include <openssl/ssl.h>
10 #include <openssl/ecdh.h>
16 // Generate a private key from just the secret parameter
17 int EC_KEY_regenerate_key(EC_KEY *eckey, BIGNUM *priv_key)
21 EC_POINT *pub_key = NULL;
25 const EC_GROUP *group = EC_KEY_get0_group(eckey);
27 if ((ctx = BN_CTX_new()) == NULL)
30 pub_key = EC_POINT_new(group);
35 if (!EC_POINT_mul(group, pub_key, priv_key, NULL, NULL, ctx))
38 EC_KEY_set_private_key(eckey,priv_key);
39 EC_KEY_set_public_key(eckey,pub_key);
46 EC_POINT_free(pub_key);
53 // Perform ECDSA key recovery (see SEC1 4.1.6) for curves over (mod p)-fields
54 // recid selects which key is recovered
55 // if check is non-zero, additional checks are performed
56 int ECDSA_SIG_recover_key_GFp(EC_KEY *eckey, ECDSA_SIG *ecsig, const unsigned char *msg, int msglen, int recid, int check)
77 const EC_GROUP *group = EC_KEY_get0_group(eckey);
78 if ((ctx = BN_CTX_new()) == NULL) { ret = -1; goto err; }
80 order = BN_CTX_get(ctx);
81 if (!EC_GROUP_get_order(group, order, ctx)) { ret = -2; goto err; }
83 if (!BN_copy(x, order)) { ret=-1; goto err; }
84 if (!BN_mul_word(x, i)) { ret=-1; goto err; }
85 if (!BN_add(x, x, ecsig->r)) { ret=-1; goto err; }
86 field = BN_CTX_get(ctx);
87 if (!EC_GROUP_get_curve_GFp(group, field, NULL, NULL, ctx)) { ret=-2; goto err; }
88 if (BN_cmp(x, field) >= 0) { ret=0; goto err; }
89 if ((R = EC_POINT_new(group)) == NULL) { ret = -2; goto err; }
90 if (!EC_POINT_set_compressed_coordinates_GFp(group, R, x, recid % 2, ctx)) { ret=0; goto err; }
93 if ((O = EC_POINT_new(group)) == NULL) { ret = -2; goto err; }
94 if (!EC_POINT_mul(group, O, NULL, R, order, ctx)) { ret=-2; goto err; }
95 if (!EC_POINT_is_at_infinity(group, O)) { ret = 0; goto err; }
97 if ((Q = EC_POINT_new(group)) == NULL) { ret = -2; goto err; }
98 n = EC_GROUP_get_degree(group);
100 if (!BN_bin2bn(msg, msglen, e)) { ret=-1; goto err; }
101 if (8*msglen > n) BN_rshift(e, e, 8-(n & 7));
102 zero = BN_CTX_get(ctx);
103 if (!BN_zero(zero)) { ret=-1; goto err; }
104 if (!BN_mod_sub(e, zero, e, order, ctx)) { ret=-1; goto err; }
105 rr = BN_CTX_get(ctx);
106 if (!BN_mod_inverse(rr, ecsig->r, order, ctx)) { ret=-1; goto err; }
107 sor = BN_CTX_get(ctx);
108 if (!BN_mod_mul(sor, ecsig->s, rr, order, ctx)) { ret=-1; goto err; }
109 eor = BN_CTX_get(ctx);
110 if (!BN_mod_mul(eor, e, rr, order, ctx)) { ret=-1; goto err; }
111 if (!EC_POINT_mul(group, Q, eor, R, sor, ctx)) { ret=-2; goto err; }
112 if (!EC_KEY_set_public_key(eckey, Q)) { ret=-2; goto err; }
121 if (R != NULL) EC_POINT_free(R);
122 if (O != NULL) EC_POINT_free(O);
123 if (Q != NULL) EC_POINT_free(Q);
127 int CompareBigEndian(const unsigned char *c1, size_t c1len, const unsigned char *c2, size_t c2len) {
128 while (c1len > c2len) {
134 while (c2len > c1len) {
152 // Order of secp256k1's generator minus 1.
153 const unsigned char vchMaxModOrder[32] = {
154 0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
155 0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFE,
156 0xBA,0xAE,0xDC,0xE6,0xAF,0x48,0xA0,0x3B,
157 0xBF,0xD2,0x5E,0x8C,0xD0,0x36,0x41,0x40
160 // Half of the order of secp256k1's generator minus 1.
161 const unsigned char vchMaxModHalfOrder[32] = {
162 0x7F,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
163 0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
164 0x5D,0x57,0x6E,0x73,0x57,0xA4,0x50,0x1D,
165 0xDF,0xE9,0x2F,0x46,0x68,0x1B,0x20,0xA0
168 const unsigned char *vchZero = NULL;
172 void CKey::SetCompressedPubKey()
174 EC_KEY_set_conv_form(pkey, POINT_CONVERSION_COMPRESSED);
175 fCompressedPubKey = true;
180 fCompressedPubKey = false;
183 pkey = EC_KEY_new_by_curve_name(NID_secp256k1);
185 throw key_error("CKey::CKey() : EC_KEY_new_by_curve_name failed");
195 CKey::CKey(const CKey& b)
197 pkey = EC_KEY_dup(b.pkey);
199 throw key_error("CKey::CKey(const CKey&) : EC_KEY_dup failed");
201 fCompressedPubKey = b.fCompressedPubKey;
204 CKey& CKey::operator=(const CKey& b)
206 if (!EC_KEY_copy(pkey, b.pkey))
207 throw key_error("CKey::operator=(const CKey&) : EC_KEY_copy failed");
209 fCompressedPubKey = b.fCompressedPubKey;
218 bool CKey::IsNull() const
223 bool CKey::IsCompressed() const
225 return fCompressedPubKey;
228 bool CKey::CheckSignatureElement(const unsigned char *vch, int len, bool half) {
229 return CompareBigEndian(vch, len, vchZero, 0) > 0 &&
230 CompareBigEndian(vch, len, half ? vchMaxModHalfOrder : vchMaxModOrder, 32) <= 0;
233 bool CKey::ReserealizeSignature(std::vector<unsigned char>& vchSig)
238 unsigned char *pos = &vchSig[0];
239 ECDSA_SIG *sig = d2i_ECDSA_SIG(NULL, (const unsigned char **)&pos, vchSig.size());
244 int nSize = i2d_ECDSA_SIG(sig, NULL);
246 vchSig.resize(nSize); // grow or shrink as needed
249 i2d_ECDSA_SIG(sig, &pos);
259 void CKey::MakeNewKey(bool fCompressed)
261 if (!EC_KEY_generate_key(pkey))
262 throw key_error("CKey::MakeNewKey() : EC_KEY_generate_key failed");
264 SetCompressedPubKey();
268 bool CKey::SetPrivKey(const CPrivKey& vchPrivKey)
270 const unsigned char* pbegin = &vchPrivKey[0];
271 if (d2i_ECPrivateKey(&pkey, &pbegin, vchPrivKey.size()))
273 // In testing, d2i_ECPrivateKey can return true
274 // but fill in pkey with a key that fails
275 // EC_KEY_check_key, so:
276 if (EC_KEY_check_key(pkey))
282 // If vchPrivKey data is bad d2i_ECPrivateKey() can
283 // leave pkey in a state where calling EC_KEY_free()
284 // crashes. To avoid that, set pkey to NULL and
285 // leak the memory (a leak is better than a crash)
291 bool CKey::SetSecret(const CSecret& vchSecret, bool fCompressed)
294 pkey = EC_KEY_new_by_curve_name(NID_secp256k1);
296 throw key_error("CKey::SetSecret() : EC_KEY_new_by_curve_name failed");
297 if (vchSecret.size() != 32)
298 throw key_error("CKey::SetSecret() : secret must be 32 bytes");
299 BIGNUM *bn = BN_bin2bn(&vchSecret[0],32,BN_new());
301 throw key_error("CKey::SetSecret() : BN_bin2bn failed");
302 if (!EC_KEY_regenerate_key(pkey,bn))
305 throw key_error("CKey::SetSecret() : EC_KEY_regenerate_key failed");
309 if (fCompressed || fCompressedPubKey)
310 SetCompressedPubKey();
314 CSecret CKey::GetSecret(bool &fCompressed) const
318 const BIGNUM *bn = EC_KEY_get0_private_key(pkey);
319 int nBytes = BN_num_bytes(bn);
321 throw key_error("CKey::GetSecret() : EC_KEY_get0_private_key failed");
322 int n=BN_bn2bin(bn,&vchRet[32 - nBytes]);
324 throw key_error("CKey::GetSecret(): BN_bn2bin failed");
325 fCompressed = fCompressedPubKey;
329 CPrivKey CKey::GetPrivKey() const
331 int nSize = i2d_ECPrivateKey(pkey, NULL);
333 throw key_error("CKey::GetPrivKey() : i2d_ECPrivateKey failed");
334 CPrivKey vchPrivKey(nSize, 0);
335 unsigned char* pbegin = &vchPrivKey[0];
336 if (i2d_ECPrivateKey(pkey, &pbegin) != nSize)
337 throw key_error("CKey::GetPrivKey() : i2d_ECPrivateKey returned unexpected size");
341 bool CKey::SetPubKey(const CPubKey& vchPubKey)
343 const unsigned char* pbegin = &vchPubKey.vchPubKey[0];
344 if (o2i_ECPublicKey(&pkey, &pbegin, vchPubKey.vchPubKey.size()))
347 if (vchPubKey.vchPubKey.size() == 33)
348 SetCompressedPubKey();
356 CPubKey CKey::GetPubKey() const
358 int nSize = i2o_ECPublicKey(pkey, NULL);
360 throw key_error("CKey::GetPubKey() : i2o_ECPublicKey failed");
361 std::vector<unsigned char> vchPubKey(nSize, 0);
362 unsigned char* pbegin = &vchPubKey[0];
363 if (i2o_ECPublicKey(pkey, &pbegin) != nSize)
364 throw key_error("CKey::GetPubKey() : i2o_ECPublicKey returned unexpected size");
365 return CPubKey(vchPubKey);
368 bool CKey::Sign(uint256 hash, std::vector<unsigned char>& vchSig)
371 ECDSA_SIG *sig = ECDSA_do_sign((unsigned char*)&hash, sizeof(hash), pkey);
374 const EC_GROUP *group = EC_KEY_get0_group(pkey);
375 CBigNum order, halforder;
376 EC_GROUP_get_order(group, &order, NULL);
377 BN_rshift1(&halforder, &order);
378 // enforce low S values, by negating the value (modulo the order) if above order/2.
379 if (BN_cmp(sig->s, &halforder) > 0) {
380 BN_sub(sig->s, &order, sig->s);
382 unsigned int nSize = ECDSA_size(pkey);
383 vchSig.resize(nSize); // Make sure it is big enough
384 unsigned char *pos = &vchSig[0];
385 nSize = i2d_ECDSA_SIG(sig, &pos);
387 vchSig.resize(nSize); // Shrink to fit actual size
388 // Testing our new signature
389 if (ECDSA_verify(0, (unsigned char*)&hash, sizeof(hash), &vchSig[0], vchSig.size(), pkey) != 1) {
396 // create a compact signature (65 bytes), which allows reconstructing the used public key
397 // The format is one header byte, followed by two times 32 bytes for the serialized r and s values.
398 // The header byte: 0x1B = first key with even y, 0x1C = first key with odd y,
399 // 0x1D = second key with even y, 0x1E = second key with odd y
400 bool CKey::SignCompact(uint256 hash, std::vector<unsigned char>& vchSig)
403 ECDSA_SIG *sig = ECDSA_do_sign((unsigned char*)&hash, sizeof(hash), pkey);
406 const EC_GROUP *group = EC_KEY_get0_group(pkey);
407 CBigNum order, halforder;
408 EC_GROUP_get_order(group, &order, NULL);
409 BN_rshift1(&halforder, &order);
410 // enforce low S values, by negating the value (modulo the order) if above order/2.
411 if (BN_cmp(sig->s, &halforder) > 0) {
412 BN_sub(sig->s, &order, sig->s);
416 int nBitsR = BN_num_bits(sig->r);
417 int nBitsS = BN_num_bits(sig->s);
418 if (nBitsR <= 256 && nBitsS <= 256)
421 for (int8_t i=0; i<4; i++)
425 if (fCompressedPubKey)
426 keyRec.SetCompressedPubKey();
427 if (ECDSA_SIG_recover_key_GFp(keyRec.pkey, sig, (unsigned char*)&hash, sizeof(hash), i, 1) == 1)
428 if (keyRec.GetPubKey() == this->GetPubKey())
438 throw key_error("CKey::SignCompact() : unable to construct recoverable key");
441 vchSig[0] = nRecId+27+(fCompressedPubKey ? 4 : 0);
442 BN_bn2bin(sig->r,&vchSig[33-(nBitsR+7)/8]);
443 BN_bn2bin(sig->s,&vchSig[65-(nBitsS+7)/8]);
450 // reconstruct public key from a compact signature
451 // This is only slightly more CPU intensive than just verifying it.
452 // If this function succeeds, the recovered public key is guaranteed to be valid
453 // (the signature is a valid signature of the given data for that key)
454 bool CKey::SetCompactSignature(uint256 hash, const std::vector<unsigned char>& vchSig)
456 if (vchSig.size() != 65)
461 ECDSA_SIG *sig = ECDSA_SIG_new();
462 BN_bin2bn(&vchSig[1],32,sig->r);
463 BN_bin2bn(&vchSig[33],32,sig->s);
466 pkey = EC_KEY_new_by_curve_name(NID_secp256k1);
469 SetCompressedPubKey();
472 if (ECDSA_SIG_recover_key_GFp(pkey, sig, (unsigned char*)&hash, sizeof(hash), nV - 27, 0) == 1)
482 bool CKey::Verify(uint256 hash, const std::vector<unsigned char>& vchSig)
487 // New versions of OpenSSL will reject non-canonical DER signatures. de/re-serialize first.
488 unsigned char *norm_der = NULL;
489 ECDSA_SIG *norm_sig = ECDSA_SIG_new();
490 const unsigned char* sigptr = &vchSig[0];
492 if (d2i_ECDSA_SIG(&norm_sig, &sigptr, vchSig.size()) == NULL)
494 /* As of OpenSSL 1.0.0p d2i_ECDSA_SIG frees and nulls the pointer on
495 * error. But OpenSSL's own use of this function redundantly frees the
496 * result. As ECDSA_SIG_free(NULL) is a no-op, and in the absence of a
497 * clear contract for the function behaving the same way is more
500 ECDSA_SIG_free(norm_sig);
503 int derlen = i2d_ECDSA_SIG(norm_sig, &norm_der);
504 ECDSA_SIG_free(norm_sig);
508 // -1 = error, 0 = bad sig, 1 = good
509 bool ret = ECDSA_verify(0, (unsigned char*)&hash, sizeof(hash), norm_der, derlen, pkey) == 1;
510 OPENSSL_free(norm_der);
514 bool CKey::VerifyCompact(uint256 hash, const std::vector<unsigned char>& vchSig)
517 if (!key.SetCompactSignature(hash, vchSig))
519 if (GetPubKey() != key.GetPubKey())
530 if (!EC_KEY_check_key(pkey))
534 CSecret secret = GetSecret(fCompr);
536 key2.SetSecret(secret, fCompr);
537 return GetPubKey() == key2.GetPubKey();
547 group = EC_GROUP_new_by_curve_name(NID_secp256k1);
549 err = "EC_KEY_new_by_curve_name failed.";
553 point = EC_POINT_new(group);
555 err = "EC_POINT_new failed.";
561 err = "BN_CTX_new failed.";
568 if (group) EC_GROUP_free(group);
569 if (point) EC_POINT_free(point);
570 throw std::runtime_error(std::string("CPoint::CPoint() : - ") + err);
573 bool CPoint::operator!=(const CPoint &a)
575 if (EC_POINT_cmp(group, point, a.point, ctx) != 0)
581 if (point) EC_POINT_free(point);
582 if (group) EC_GROUP_free(group);
583 if (ctx) BN_CTX_free(ctx);
586 // Initialize from octets stream
587 bool CPoint::setBytes(const std::vector<unsigned char> &vchBytes)
589 if (!EC_POINT_oct2point(group, point, &vchBytes[0], vchBytes.size(), ctx)) {
595 // Initialize from octets stream
596 bool CPoint::setPubKey(const CPubKey &vchPubKey)
598 return setBytes(vchPubKey.Raw());
601 // Serialize to octets stream
602 bool CPoint::getBytes(std::vector<unsigned char> &vchBytes)
604 unsigned int nSize = EC_POINT_point2oct(group, point, POINT_CONVERSION_COMPRESSED, NULL, 0, ctx);
605 vchBytes.resize(nSize);
606 if (!(nSize == EC_POINT_point2oct(group, point, POINT_CONVERSION_COMPRESSED, &vchBytes[0], nSize, ctx))) {
612 // ECC multiplication by specified multiplier
613 bool CPoint::ECMUL(const CBigNum &bnMultiplier)
615 if (!EC_POINT_mul(group, point, NULL, point, &bnMultiplier, NULL)) {
616 printf("CPoint::ECMUL() : EC_POINT_mul failed");
624 bool CPoint::ECMULGEN(const CBigNum &bnMultiplier, const CPoint &qPoint)
626 if (!EC_POINT_mul(group, point, &bnMultiplier, qPoint.point, BN_value_one(), NULL)) {
627 printf("CPoint::ECMULGEN() : EC_POINT_mul failed.");
636 void CMalleablePubKey::GetVariant(CPubKey &R, CPubKey &vchPubKeyVariant)
638 EC_KEY *eckey = NULL;
639 eckey = EC_KEY_new_by_curve_name(NID_secp256k1);
641 throw key_error("CMalleablePubKey::GetVariant() : EC_KEY_new_by_curve_name failed");
644 // Use standard key generation function to get r and R values.
646 // r will be presented by private key;
647 // R is ECDSA public key which calculated as G*r
648 if (!EC_KEY_generate_key(eckey)) {
649 throw key_error("CMalleablePubKey::GetVariant() : EC_KEY_generate_key failed");
652 EC_KEY_set_conv_form(eckey, POINT_CONVERSION_COMPRESSED);
654 int nSize = i2o_ECPublicKey(eckey, NULL);
656 throw key_error("CMalleablePubKey::GetVariant() : i2o_ECPublicKey failed");
659 std::vector<unsigned char> vchPubKey(nSize, 0);
660 unsigned char* pbegin_R = &vchPubKey[0];
662 if (i2o_ECPublicKey(eckey, &pbegin_R) != nSize) {
663 throw key_error("CMalleablePubKey::GetVariant() : i2o_ECPublicKey returned unexpected size");
667 R = CPubKey(vchPubKey);
669 // OpenSSL BIGNUM representation of r value
671 bnr = *(CBigNum*) EC_KEY_get0_private_key(eckey);
675 if (!point.setPubKey(pubKeyL)) {
676 throw key_error("CMalleablePubKey::GetVariant() : Unable to decode L value");
682 std::vector<unsigned char> vchLr;
683 if (!point.getBytes(vchLr)) {
684 throw key_error("CMalleablePubKey::GetVariant() : Unable to convert Lr value");
687 // Calculate Hash(L*r) and then get a BIGNUM representation of hash value.
689 bnHash.setuint160(Hash160(vchLr));
692 pointH.setPubKey(pubKeyH);
695 // Calculate P = Hash(L*r)*G + H
696 P.ECMULGEN(bnHash, pointH);
698 if (P.IsInfinity()) {
699 throw key_error("CMalleablePubKey::GetVariant() : P is infinity");
702 std::vector<unsigned char> vchResult;
703 P.getBytes(vchResult);
705 vchPubKeyVariant = CPubKey(vchResult);
708 std::string CMalleablePubKey::ToString() const
710 CDataStream ssKey(SER_NETWORK, PROTOCOL_VERSION);
712 std::vector<unsigned char> vch(ssKey.begin(), ssKey.end());
714 return EncodeBase58Check(vch);
717 bool CMalleablePubKey::SetString(const std::string& strMalleablePubKey)
719 std::vector<unsigned char> vchTemp;
720 if (!DecodeBase58Check(strMalleablePubKey, vchTemp)) {
721 throw key_error("CMalleablePubKey::SetString() : Provided key data seems corrupted.");
724 CDataStream ssKey(vchTemp, SER_NETWORK, PROTOCOL_VERSION);
730 bool CMalleablePubKey::operator==(const CMalleablePubKey &b)
732 return (nVersion == b.nVersion &&
733 pubKeyL == b.pubKeyL &&
734 pubKeyH == b.pubKeyH);
740 void CMalleableKey::Reset()
748 void CMalleableKey::MakeNewKeys()
751 bool fCompressed = true;
756 vchSecretL = L.GetSecret(fCompressed);
757 vchSecretH = H.GetSecret(fCompressed);
759 nVersion = CURRENT_VERSION;
762 CMalleableKey::CMalleableKey()
767 CMalleableKey::CMalleableKey(const CMalleableKey &b)
769 SetSecrets(b.vchSecretL, b.vchSecretH);
772 CMalleableKey::CMalleableKey(const CSecret &L, const CSecret &H)
777 CMalleableKey& CMalleableKey::operator=(const CMalleableKey &b)
779 SetSecrets(b.vchSecretL, b.vchSecretH);
784 CMalleableKey::~CMalleableKey()
788 bool CMalleableKey::IsNull() const
790 return nVersion != CURRENT_VERSION;
793 bool CMalleableKey::SetSecrets(const CSecret &pvchSecretL, const CSecret &pvchSecretH)
798 if (pvchSecretL.size() != 32 || !pvchSecretH.size() != 32 || !L.SetSecret(pvchSecretL, true) || !H.SetSecret(pvchSecretH, true))
804 vchSecretL = pvchSecretL;
805 vchSecretH = pvchSecretH;
806 nVersion = CURRENT_VERSION;
811 void CMalleableKey::GetSecrets(CSecret &pvchSecretL, CSecret &pvchSecretH) const
813 pvchSecretL = vchSecretL;
814 pvchSecretH = vchSecretH;
817 CMalleablePubKey CMalleableKey::GetMalleablePubKey() const
820 L.SetSecret(vchSecretL, true);
821 H.SetSecret(vchSecretH, true);
823 std::vector<unsigned char> vchPubKeyL = L.GetPubKey().Raw();
824 std::vector<unsigned char> vchPubKeyH = H.GetPubKey().Raw();
826 return CMalleablePubKey(vchPubKeyL, vchPubKeyH);
830 bool CMalleableKey::CheckKeyVariant(const CPubKey &R, const CPubKey &vchPubKeyVariant) const
833 throw key_error("CMalleableKey::CheckKeyVariant() : Attempting to run on NULL key object.");
837 throw key_error("CMalleableKey::CheckKeyVariant() : R is invalid");
840 if (!vchPubKeyVariant.IsValid()) {
841 throw key_error("CMalleableKey::CheckKeyVariant() : public key variant is invalid");
845 if (!point_R.setPubKey(R)) {
846 throw key_error("CMalleableKey::CheckKeyVariant() : Unable to decode R value");
850 H.SetSecret(vchSecretH, true);
851 std::vector<unsigned char> vchPubKeyH = H.GetPubKey().Raw();
854 if (!point_H.setPubKey(vchPubKeyH)) {
855 throw key_error("CMalleableKey::CheckKeyVariant() : Unable to decode H value");
859 if (!point_P.setPubKey(vchPubKeyVariant)) {
860 throw key_error("CMalleableKey::CheckKeyVariant() : Unable to decode P value");
863 // Infinity points are senseless
864 if (point_P.IsInfinity()) {
865 throw key_error("CMalleableKey::CheckKeyVariant() : P is infinity");
869 bnl.setBytes(std::vector<unsigned char>(vchSecretL.begin(), vchSecretL.end()));
873 std::vector<unsigned char> vchRl;
874 if (!point_R.getBytes(vchRl)) {
875 throw key_error("CMalleableKey::CheckKeyVariant() : Unable to convert Rl value");
878 // Calculate Hash(R*l)
880 bnHash.setuint160(Hash160(vchRl));
883 // Calculate Ps = Hash(L*r)*G + H
884 point_Ps.ECMULGEN(bnHash, point_H);
886 // Infinity points are senseless
887 if (point_Ps.IsInfinity()) {
888 throw key_error("CMalleableKey::CheckKeyVariant() : Ps is infinity");
892 if (point_Ps != point_P) {
899 // Check ownership and restore private key
900 bool CMalleableKey::CheckKeyVariant(const CPubKey &R, const CPubKey &vchPubKeyVariant, CKey &privKeyVariant) const
903 throw key_error("CMalleableKey::CheckKeyVariant() : Attempting to run on NULL key object.");
907 throw key_error("CMalleableKey::CheckKeyVariant() : R is invalid");
910 if (!vchPubKeyVariant.IsValid()) {
911 throw key_error("CMalleableKey::CheckKeyVariant() : public key variant is invalid");
915 if (!point_R.setPubKey(R)) {
916 throw key_error("CMalleableKey::CheckKeyVariant() : Unable to decode R value");
920 H.SetSecret(vchSecretH, true);
921 std::vector<unsigned char> vchPubKeyH = H.GetPubKey().Raw();
924 if (!point_H.setPubKey(vchPubKeyH)) {
925 throw key_error("CMalleableKey::CheckKeyVariant() : Unable to decode H value");
929 if (!point_P.setPubKey(vchPubKeyVariant)) {
930 throw key_error("CMalleableKey::CheckKeyVariant() : Unable to decode P value");
933 // Infinity points are senseless
934 if (point_P.IsInfinity()) {
935 throw key_error("CMalleableKey::CheckKeyVariant() : P is infinity");
939 bnl.setBytes(std::vector<unsigned char>(vchSecretL.begin(), vchSecretL.end()));
943 std::vector<unsigned char> vchRl;
944 if (!point_R.getBytes(vchRl)) {
945 throw key_error("CMalleableKey::CheckKeyVariant() : Unable to convert Rl value");
948 // Calculate Hash(R*l)
950 bnHash.setuint160(Hash160(vchRl));
953 // Calculate Ps = Hash(L*r)*G + H
954 point_Ps.ECMULGEN(bnHash, point_H);
956 // Infinity points are senseless
957 if (point_Ps.IsInfinity()) {
958 throw key_error("CMalleableKey::CheckKeyVariant() : Ps is infinity");
962 if (point_Ps != point_P) {
966 // OpenSSL BIGNUM representation of the second private key from (l, h) pair
968 bnh.setBytes(std::vector<unsigned char>(vchSecretH.begin(), vchSecretH.end()));
970 // Calculate p = Hash(R*l) + h
971 CBigNum bnp = bnHash + bnh;
973 std::vector<unsigned char> vchp = bnp.getBytes();
974 privKeyVariant.SetSecret(CSecret(vchp.begin(), vchp.end()), true);
979 std::string CMalleableKey::ToString() const
981 CDataStream ssKey(SER_NETWORK, PROTOCOL_VERSION);
983 std::vector<unsigned char> vch(ssKey.begin(), ssKey.end());
985 return EncodeBase58Check(vch);
988 bool CMalleableKey::SetString(const std::string& strMutableKey)
990 std::vector<unsigned char> vchTemp;
991 if (!DecodeBase58Check(strMutableKey, vchTemp)) {
992 throw key_error("CMalleableKey::SetString() : Provided key data seems corrupted.");
995 CDataStream ssKey(vchTemp, SER_NETWORK, PROTOCOL_VERSION);
1001 // CMalleableKeyView
1003 CMalleableKeyView::CMalleableKeyView(const CMalleableKey &b)
1005 if (b.vchSecretL.size() != 32)
1006 throw key_error("CMalleableKeyView::CMalleableKeyView() : L size must be 32 bytes");
1008 if (b.vchSecretH.size() != 32)
1009 throw key_error("CMalleableKeyView::CMalleableKeyView() : L size must be 32 bytes");
1011 vchSecretL = b.vchSecretL;
1014 H.SetSecret(b.vchSecretH, true);
1016 vchPubKeyH = H.GetPubKey().Raw();
1017 nVersion = b.nVersion;
1020 CMalleableKeyView::CMalleableKeyView(const CMalleableKeyView &b)
1022 vchSecretL = b.vchSecretL;
1023 vchPubKeyH = b.vchPubKeyH;
1024 nVersion = CURRENT_VERSION;
1027 CMalleableKeyView::CMalleableKeyView(const CSecret &L, const CPubKey &pvchPubKeyH)
1030 vchPubKeyH = pvchPubKeyH.Raw();
1031 nVersion = CURRENT_VERSION;
1034 CMalleableKeyView& CMalleableKeyView::operator=(const CMalleableKey &b)
1036 vchSecretL = b.vchSecretL;
1039 H.SetSecret(b.vchSecretH, true);
1040 vchPubKeyH = H.GetPubKey().Raw();
1041 nVersion = b.nVersion;
1046 CMalleableKeyView::~CMalleableKeyView()
1050 CMalleablePubKey CMalleableKeyView::GetMalleablePubKey() const
1053 keyL.SetSecret(vchSecretL, true);
1054 return CMalleablePubKey(keyL.GetPubKey(), vchPubKeyH);
1058 bool CMalleableKeyView::CheckKeyVariant(const CPubKey &R, const CPubKey &vchPubKeyVariant) const
1061 throw key_error("CMalleableKeyView::CheckKeyVariant() : R is invalid");
1064 if (!vchPubKeyVariant.IsValid()) {
1065 throw key_error("CMalleableKeyView::CheckKeyVariant() : public key variant is invalid");
1069 if (!point_R.setPubKey(R)) {
1070 throw key_error("CMalleableKeyView::CheckKeyVariant() : Unable to decode R value");
1074 if (!point_H.setPubKey(vchPubKeyH)) {
1075 throw key_error("CMalleableKeyView::CheckKeyVariant() : Unable to decode H value");
1079 if (!point_P.setPubKey(vchPubKeyVariant)) {
1080 throw key_error("CMalleableKeyView::CheckKeyVariant() : Unable to decode P value");
1083 // Infinity points are senseless
1084 if (point_P.IsInfinity()) {
1085 throw key_error("CMalleableKeyView::CheckKeyVariant() : P is infinity");
1089 bnl.setBytes(std::vector<unsigned char>(vchSecretL.begin(), vchSecretL.end()));
1093 std::vector<unsigned char> vchRl;
1094 if (!point_R.getBytes(vchRl)) {
1095 throw key_error("CMalleableKeyView::CheckKeyVariant() : Unable to convert Rl value");
1098 // Calculate Hash(R*l)
1100 bnHash.setuint160(Hash160(vchRl));
1103 // Calculate Ps = Hash(L*r)*G + H
1104 point_Ps.ECMULGEN(bnHash, point_H);
1106 // Infinity points are senseless
1107 if (point_Ps.IsInfinity()) {
1108 throw key_error("CMalleableKeyView::CheckKeyVariant() : Ps is infinity");
1112 if (point_Ps != point_P) {
1119 std::string CMalleableKeyView::ToString() const
1121 CDataStream ssKey(SER_NETWORK, PROTOCOL_VERSION);
1123 std::vector<unsigned char> vch(ssKey.begin(), ssKey.end());
1125 return EncodeBase58Check(vch);
1128 bool CMalleableKeyView::SetString(const std::string& strMutableKey)
1130 std::vector<unsigned char> vchTemp;
1131 if (!DecodeBase58Check(strMutableKey, vchTemp)) {
1132 throw key_error("CMalleableKeyView::SetString() : Provided key data seems corrupted.");
1135 CDataStream ssKey(vchTemp, SER_NETWORK, PROTOCOL_VERSION);
1141 bool CMalleableKeyView::IsNull() const
1143 return nVersion != CURRENT_VERSION;
1146 //// Asymmetric encryption
1148 void CPubKey::EncryptData(const std::vector<unsigned char>& data, std::vector<unsigned char>& encrypted)
1151 key.SetPubKey(*this);
1153 key.EncryptData(data, encrypted);
1156 void CKey::EncryptData(const std::vector<unsigned char>& data, std::vector<unsigned char>& encrypted)
1159 char error[1024] = "Unknown error";
1160 cryptogram_t *cryptogram;
1162 ctx = create_context(pkey);
1163 if (!EC_KEY_get0_public_key(ctx->user_key))
1164 throw key_error("Given EC key is not public key");
1166 cryptogram = ecies_encrypt(ctx, (unsigned char*)&data[0], data.size(), error);
1167 if (cryptogram == NULL) {
1170 throw key_error(std::string("Error in encryption: %s") + error);
1173 encrypted.resize(cryptogram_data_sum_length(cryptogram));
1174 unsigned char *key_data = cryptogram_key_data(cryptogram);
1175 memcpy(&encrypted[0], key_data, encrypted.size());
1176 cryptogram_free(cryptogram);
1180 void CKey::DecryptData(const std::vector<unsigned char>& encrypted, std::vector<unsigned char>& data)
1183 char error[1024] = "Unknown error";
1184 cryptogram_t *cryptogram;
1186 unsigned char *decrypted;
1188 ctx = create_context(pkey);
1189 if (!EC_KEY_get0_private_key(ctx->user_key))
1190 throw key_error("Given EC key is not private key");
1192 size_t key_length = ctx->stored_key_length;
1193 size_t mac_length = EVP_MD_size(ctx->md);
1194 cryptogram = cryptogram_alloc(key_length, mac_length, encrypted.size() - key_length - mac_length);
1196 memcpy(cryptogram_key_data(cryptogram), &encrypted[0], encrypted.size());
1198 decrypted = ecies_decrypt(ctx, cryptogram, &length, error);
1199 cryptogram_free(cryptogram);
1202 if (decrypted == NULL) {
1203 throw key_error(std::string("Error in decryption: %s") + error);
1206 data.resize(length);
1207 memcpy(&data[0], decrypted, length);