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/evp.h>
9 #include <openssl/obj_mac.h>
14 // Generate a private key from just the secret parameter
15 int EC_KEY_regenerate_key(EC_KEY *eckey, BIGNUM *priv_key)
19 EC_POINT *pub_key = NULL;
23 const EC_GROUP *group = EC_KEY_get0_group(eckey);
25 if ((ctx = BN_CTX_new()) == NULL)
28 pub_key = EC_POINT_new(group);
33 if (!EC_POINT_mul(group, pub_key, priv_key, NULL, NULL, ctx))
36 EC_KEY_set_private_key(eckey,priv_key);
37 EC_KEY_set_public_key(eckey,pub_key);
44 EC_POINT_free(pub_key);
51 // Perform ECDSA key recovery (see SEC1 4.1.6) for curves over (mod p)-fields
52 // recid selects which key is recovered
53 // if check is non-zero, additional checks are performed
54 int ECDSA_SIG_recover_key_GFp(EC_KEY *eckey, ECDSA_SIG *ecsig, const unsigned char *msg, int msglen, int recid, int check)
75 const EC_GROUP *group = EC_KEY_get0_group(eckey);
76 if ((ctx = BN_CTX_new()) == NULL) { ret = -1; goto err; }
78 order = BN_CTX_get(ctx);
79 if (!EC_GROUP_get_order(group, order, ctx)) { ret = -2; goto err; }
81 if (!BN_copy(x, order)) { ret=-1; goto err; }
82 if (!BN_mul_word(x, i)) { ret=-1; goto err; }
83 if (!BN_add(x, x, ecsig->r)) { ret=-1; goto err; }
84 field = BN_CTX_get(ctx);
85 if (!EC_GROUP_get_curve_GFp(group, field, NULL, NULL, ctx)) { ret=-2; goto err; }
86 if (BN_cmp(x, field) >= 0) { ret=0; goto err; }
87 if ((R = EC_POINT_new(group)) == NULL) { ret = -2; goto err; }
88 if (!EC_POINT_set_compressed_coordinates_GFp(group, R, x, recid % 2, ctx)) { ret=0; goto err; }
91 if ((O = EC_POINT_new(group)) == NULL) { ret = -2; goto err; }
92 if (!EC_POINT_mul(group, O, NULL, R, order, ctx)) { ret=-2; goto err; }
93 if (!EC_POINT_is_at_infinity(group, O)) { ret = 0; goto err; }
95 if ((Q = EC_POINT_new(group)) == NULL) { ret = -2; goto err; }
96 n = EC_GROUP_get_degree(group);
98 if (!BN_bin2bn(msg, msglen, e)) { ret=-1; goto err; }
99 if (8*msglen > n) BN_rshift(e, e, 8-(n & 7));
100 zero = BN_CTX_get(ctx);
101 if (!BN_zero(zero)) { ret=-1; goto err; }
102 if (!BN_mod_sub(e, zero, e, order, ctx)) { ret=-1; goto err; }
103 rr = BN_CTX_get(ctx);
104 if (!BN_mod_inverse(rr, ecsig->r, order, ctx)) { ret=-1; goto err; }
105 sor = BN_CTX_get(ctx);
106 if (!BN_mod_mul(sor, ecsig->s, rr, order, ctx)) { ret=-1; goto err; }
107 eor = BN_CTX_get(ctx);
108 if (!BN_mod_mul(eor, e, rr, order, ctx)) { ret=-1; goto err; }
109 if (!EC_POINT_mul(group, Q, eor, R, sor, ctx)) { ret=-2; goto err; }
110 if (!EC_KEY_set_public_key(eckey, Q)) { ret=-2; goto err; }
119 if (R != NULL) EC_POINT_free(R);
120 if (O != NULL) EC_POINT_free(O);
121 if (Q != NULL) EC_POINT_free(Q);
125 int CompareBigEndian(const unsigned char *c1, size_t c1len, const unsigned char *c2, size_t c2len) {
126 while (c1len > c2len) {
132 while (c2len > c1len) {
150 // Order of secp256k1's generator minus 1.
151 const unsigned char vchMaxModOrder[32] = {
152 0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
153 0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFE,
154 0xBA,0xAE,0xDC,0xE6,0xAF,0x48,0xA0,0x3B,
155 0xBF,0xD2,0x5E,0x8C,0xD0,0x36,0x41,0x40
158 // Half of the order of secp256k1's generator minus 1.
159 const unsigned char vchMaxModHalfOrder[32] = {
160 0x7F,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
161 0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
162 0x5D,0x57,0x6E,0x73,0x57,0xA4,0x50,0x1D,
163 0xDF,0xE9,0x2F,0x46,0x68,0x1B,0x20,0xA0
166 const unsigned char *vchZero = NULL;
168 void CKey::SetCompressedPubKey(bool fCompressed)
170 EC_KEY_set_conv_form(pkey, fCompressed ? POINT_CONVERSION_COMPRESSED : POINT_CONVERSION_UNCOMPRESSED);
178 pkey = EC_KEY_new_by_curve_name(NID_secp256k1);
180 throw key_error("CKey::CKey() : EC_KEY_new_by_curve_name failed");
189 CKey::CKey(const CKey& b)
191 pkey = EC_KEY_dup(b.pkey);
193 throw key_error("CKey::CKey(const CKey&) : EC_KEY_dup failed");
197 CKey::CKey(const CSecret& b, bool fCompressed)
199 pkey = EC_KEY_new_by_curve_name(NID_secp256k1);
201 throw key_error("CKey::CKey(const CKey&) : EC_KEY_dup failed");
202 SetSecret(b, fCompressed);
205 CKey& CKey::operator=(const CKey& b)
207 if (!EC_KEY_copy(pkey, b.pkey))
208 throw key_error("CKey::operator=(const CKey&) : EC_KEY_copy failed");
219 bool CKey::IsNull() const
224 bool CKey::IsCompressed() const
226 return (EC_KEY_get_conv_form(pkey) == POINT_CONVERSION_COMPRESSED);
229 bool CKey::CheckSignatureElement(const unsigned char *vch, int len, bool half) {
230 return CompareBigEndian(vch, len, vchZero, 0) > 0 &&
231 CompareBigEndian(vch, len, half ? vchMaxModHalfOrder : vchMaxModOrder, 32) <= 0;
234 bool CPubKey::ReserealizeSignature(std::vector<unsigned char>& vchSig)
239 unsigned char *pos = &vchSig[0];
240 ECDSA_SIG *sig = d2i_ECDSA_SIG(NULL, (const unsigned char **)&pos, vchSig.size());
245 int nSize = i2d_ECDSA_SIG(sig, NULL);
247 vchSig.resize(nSize); // grow or shrink as needed
250 i2d_ECDSA_SIG(sig, &pos);
260 void CKey::MakeNewKey(bool fCompressed)
262 if (!EC_KEY_generate_key(pkey))
263 throw key_error("CKey::MakeNewKey() : EC_KEY_generate_key failed");
264 SetCompressedPubKey(fCompressed);
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");
298 if (vchSecret.size() != 32)
299 throw key_error("CKey::SetSecret() : secret must be 32 bytes");
300 BIGNUM *bn = BN_bin2bn(&vchSecret[0],32,BN_new());
302 throw key_error("CKey::SetSecret() : BN_bin2bn failed");
303 if (!EC_KEY_regenerate_key(pkey,bn))
306 throw key_error("CKey::SetSecret() : EC_KEY_regenerate_key failed");
310 SetCompressedPubKey(fCompressed);
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 = IsCompressed();
329 bool CKey::WritePEM(BIO *streamObj, const SecureString &strPassKey) const // dumppem 4KJLA99FyqMMhjjDe7KnRXK4sjtv9cCtNS /tmp/test.pem 123
331 EVP_PKEY *evpKey = EVP_PKEY_new();
332 if (!EVP_PKEY_assign_EC_KEY(evpKey, pkey))
333 return error("CKey::WritePEM() : Error initializing EVP_PKEY instance.");
334 if(!PEM_write_bio_PKCS8PrivateKey(streamObj, evpKey, EVP_aes_256_cbc(), (char *)&strPassKey[0], strPassKey.size(), NULL, NULL))
335 return error("CKey::WritePEM() : Error writing private key data to stream object");
340 CSecret CKey::GetSecret() const
343 return GetSecret(fCompressed);
346 CPrivKey CKey::GetPrivKey() const
348 int nSize = i2d_ECPrivateKey(pkey, NULL);
350 throw key_error("CKey::GetPrivKey() : i2d_ECPrivateKey failed");
351 CPrivKey vchPrivKey(nSize, 0);
352 unsigned char* pbegin = &vchPrivKey[0];
353 if (i2d_ECPrivateKey(pkey, &pbegin) != nSize)
354 throw key_error("CKey::GetPrivKey() : i2d_ECPrivateKey returned unexpected size");
358 CPubKey CKey::GetPubKey() const
360 int nSize = i2o_ECPublicKey(pkey, NULL);
362 throw key_error("CKey::GetPubKey() : i2o_ECPublicKey failed");
363 std::vector<unsigned char> vchPubKey(nSize, 0);
364 unsigned char* pbegin = &vchPubKey[0];
365 if (i2o_ECPublicKey(pkey, &pbegin) != nSize)
366 throw key_error("CKey::GetPubKey() : i2o_ECPublicKey returned unexpected size");
367 return CPubKey(vchPubKey);
370 bool CKey::Sign(uint256 hash, std::vector<unsigned char>& vchSig)
373 ECDSA_SIG *sig = ECDSA_do_sign((unsigned char*)&hash, sizeof(hash), pkey);
376 const EC_GROUP *group = EC_KEY_get0_group(pkey);
377 CBigNum order, halforder;
378 EC_GROUP_get_order(group, &order, NULL);
379 BN_rshift1(&halforder, &order);
380 // enforce low S values, by negating the value (modulo the order) if above order/2.
381 if (BN_cmp(sig->s, &halforder) > 0) {
382 BN_sub(sig->s, &order, sig->s);
384 unsigned int nSize = ECDSA_size(pkey);
385 vchSig.resize(nSize); // Make sure it is big enough
386 unsigned char *pos = &vchSig[0];
387 nSize = i2d_ECDSA_SIG(sig, &pos);
389 vchSig.resize(nSize); // Shrink to fit actual size
390 // Testing our new signature
391 if (ECDSA_verify(0, (unsigned char*)&hash, sizeof(hash), &vchSig[0], vchSig.size(), pkey) != 1) {
398 // create a compact signature (65 bytes), which allows reconstructing the used public key
399 // The format is one header byte, followed by two times 32 bytes for the serialized r and s values.
400 // The header byte: 0x1B = first key with even y, 0x1C = first key with odd y,
401 // 0x1D = second key with even y, 0x1E = second key with odd y
402 bool CKey::SignCompact(uint256 hash, std::vector<unsigned char>& vchSig)
405 ECDSA_SIG *sig = ECDSA_do_sign((unsigned char*)&hash, sizeof(hash), pkey);
408 const EC_GROUP *group = EC_KEY_get0_group(pkey);
409 CBigNum order, halforder;
410 EC_GROUP_get_order(group, &order, NULL);
411 BN_rshift1(&halforder, &order);
412 // enforce low S values, by negating the value (modulo the order) if above order/2.
413 if (BN_cmp(sig->s, &halforder) > 0) {
414 BN_sub(sig->s, &order, sig->s);
418 int nBitsR = BN_num_bits(sig->r);
419 int nBitsS = BN_num_bits(sig->s);
420 bool fCompressedPubKey = IsCompressed();
421 if (nBitsR <= 256 && nBitsS <= 256)
424 for (int8_t i=0; i<4; i++)
428 keyRec.SetCompressedPubKey(fCompressedPubKey);
429 if (ECDSA_SIG_recover_key_GFp(keyRec.pkey, sig, (unsigned char*)&hash, sizeof(hash), i, 1) == 1)
430 if (keyRec.GetPubKey() == this->GetPubKey())
440 throw key_error("CKey::SignCompact() : unable to construct recoverable key");
443 vchSig[0] = nRecId+27+(fCompressedPubKey ? 4 : 0);
444 BN_bn2bin(sig->r,&vchSig[33-(nBitsR+7)/8]);
445 BN_bn2bin(sig->s,&vchSig[65-(nBitsS+7)/8]);
452 // reconstruct public key from a compact signature
453 // This is only slightly more CPU intensive than just verifying it.
454 // If this function succeeds, the recovered public key is guaranteed to be valid
455 // (the signature is a valid signature of the given data for that key)
456 bool CPubKey::SetCompactSignature(uint256 hash, const std::vector<unsigned char>& vchSig)
458 if (vchSig.size() != 65)
463 ECDSA_SIG *sig = ECDSA_SIG_new();
464 BN_bin2bn(&vchSig[1],32,sig->r);
465 BN_bin2bn(&vchSig[33],32,sig->s);
466 bool fSuccessful = false;
467 EC_KEY* pkey = EC_KEY_new_by_curve_name(NID_secp256k1);
471 EC_KEY_set_conv_form(pkey, POINT_CONVERSION_COMPRESSED);
475 if (ECDSA_SIG_recover_key_GFp(pkey, sig, (unsigned char*)&hash, sizeof(hash), nV - 27, 0) != 1)
477 int nSize = i2o_ECPublicKey(pkey, NULL);
480 std::vector<unsigned char> vchPubKey(nSize, 0);
481 unsigned char* pbegin = &vchPubKey[0];
482 if (i2o_ECPublicKey(pkey, &pbegin) != nSize)
484 Set(vchPubKey.begin(), vchPubKey.end());
485 fSuccessful = IsValid();
495 bool CPubKey::Verify(const uint256 &hash, const std::vector<unsigned char>& vchSig) const
497 if (vchSig.empty() || !IsValid())
500 EC_KEY *pkey = EC_KEY_new_by_curve_name(NID_secp256k1);
501 ECDSA_SIG *norm_sig = ECDSA_SIG_new();
510 uint8_t *norm_der = NULL;
511 const uint8_t* pbegin = &vbytes[0];
512 const uint8_t* sigptr = &vchSig[0];
514 // Trying to parse public key
515 if (!o2i_ECPublicKey(&pkey, &pbegin, size()))
517 // New versions of OpenSSL are rejecting a non-canonical DER signatures, de/re-serialize first.
518 if (d2i_ECDSA_SIG(&norm_sig, &sigptr, vchSig.size()) == NULL)
520 if ((derlen = i2d_ECDSA_SIG(norm_sig, &norm_der)) <= 0)
523 // -1 = error, 0 = bad sig, 1 = good
524 ret = ECDSA_verify(0, (const unsigned char*)&hash, sizeof(hash), norm_der, derlen, pkey) == 1;
525 OPENSSL_free(norm_der);
528 ECDSA_SIG_free(norm_sig);
534 bool CPubKey::VerifyCompact(uint256 hash, const std::vector<unsigned char>& vchSig)
537 if (!key.SetCompactSignature(hash, vchSig))
547 if (!EC_KEY_check_key(pkey))
551 CSecret secret = GetSecret(fCompr);
553 key2.SetSecret(secret, fCompr);
555 return GetPubKey() == key2.GetPubKey();
565 group = EC_GROUP_new_by_curve_name(NID_secp256k1);
567 err = "EC_KEY_new_by_curve_name failed.";
571 point = EC_POINT_new(group);
573 err = "EC_POINT_new failed.";
579 err = "BN_CTX_new failed.";
586 if (group) EC_GROUP_free(group);
587 if (point) EC_POINT_free(point);
588 throw std::runtime_error(std::string("CPoint::CPoint() : - ") + err);
591 bool CPoint::operator!=(const CPoint &a)
593 if (EC_POINT_cmp(group, point, a.point, ctx) != 0)
599 if (point) EC_POINT_free(point);
600 if (group) EC_GROUP_free(group);
601 if (ctx) BN_CTX_free(ctx);
604 // Initialize from octets stream
605 bool CPoint::setBytes(const std::vector<unsigned char> &vchBytes)
607 if (!EC_POINT_oct2point(group, point, &vchBytes[0], vchBytes.size(), ctx)) {
613 // Initialize from octets stream
614 bool CPoint::setPubKey(const CPubKey &key)
616 std::vector<uint8_t> vchPubKey(key.begin(), key.end());
617 return setBytes(vchPubKey);
620 // Serialize to octets stream
621 bool CPoint::getBytes(std::vector<unsigned char> &vchBytes)
623 size_t nSize = EC_POINT_point2oct(group, point, POINT_CONVERSION_COMPRESSED, NULL, 0, ctx);
624 vchBytes.resize(nSize);
625 if (!(nSize == EC_POINT_point2oct(group, point, POINT_CONVERSION_COMPRESSED, &vchBytes[0], nSize, ctx))) {
631 // ECC multiplication by specified multiplier
632 bool CPoint::ECMUL(const CBigNum &bnMultiplier)
634 if (!EC_POINT_mul(group, point, NULL, point, &bnMultiplier, NULL)) {
635 printf("CPoint::ECMUL() : EC_POINT_mul failed");
643 bool CPoint::ECMULGEN(const CBigNum &bnMultiplier, const CPoint &qPoint)
645 if (!EC_POINT_mul(group, point, &bnMultiplier, qPoint.point, BN_value_one(), NULL)) {
646 printf("CPoint::ECMULGEN() : EC_POINT_mul failed.");
655 void CMalleablePubKey::GetVariant(CPubKey &R, CPubKey &vchPubKeyVariant)
657 EC_KEY *eckey = NULL;
658 eckey = EC_KEY_new_by_curve_name(NID_secp256k1);
660 throw key_error("CMalleablePubKey::GetVariant() : EC_KEY_new_by_curve_name failed");
663 // Use standard key generation function to get r and R values.
665 // r will be presented by private key;
666 // R is ECDSA public key which calculated as G*r
667 if (!EC_KEY_generate_key(eckey)) {
668 throw key_error("CMalleablePubKey::GetVariant() : EC_KEY_generate_key failed");
671 EC_KEY_set_conv_form(eckey, POINT_CONVERSION_COMPRESSED);
673 int nSize = i2o_ECPublicKey(eckey, NULL);
675 throw key_error("CMalleablePubKey::GetVariant() : i2o_ECPublicKey failed");
678 std::vector<unsigned char> vchPubKey(nSize, 0);
679 unsigned char* pbegin_R = &vchPubKey[0];
681 if (i2o_ECPublicKey(eckey, &pbegin_R) != nSize) {
682 throw key_error("CMalleablePubKey::GetVariant() : i2o_ECPublicKey returned unexpected size");
686 R = CPubKey(vchPubKey);
688 // OpenSSL BIGNUM representation of r value
690 bnr = *(CBigNum*) EC_KEY_get0_private_key(eckey);
694 if (!point.setPubKey(pubKeyL)) {
695 throw key_error("CMalleablePubKey::GetVariant() : Unable to decode L value");
701 std::vector<unsigned char> vchLr;
702 if (!point.getBytes(vchLr)) {
703 throw key_error("CMalleablePubKey::GetVariant() : Unable to convert Lr value");
706 // Calculate Hash(L*r) and then get a BIGNUM representation of hash value.
708 bnHash.setuint160(Hash160(vchLr));
711 pointH.setPubKey(pubKeyH);
714 // Calculate P = Hash(L*r)*G + H
715 P.ECMULGEN(bnHash, pointH);
717 if (P.IsInfinity()) {
718 throw key_error("CMalleablePubKey::GetVariant() : P is infinity");
721 std::vector<unsigned char> vchResult;
722 P.getBytes(vchResult);
724 vchPubKeyVariant = CPubKey(vchResult);
727 std::string CMalleablePubKey::ToString() const
729 CDataStream ssKey(SER_NETWORK, PROTOCOL_VERSION);
731 std::vector<unsigned char> vch(ssKey.begin(), ssKey.end());
733 return EncodeBase58Check(vch);
736 bool CMalleablePubKey::setvch(const std::vector<unsigned char> &vchPubKeyPair)
738 CDataStream ssKey(vchPubKeyPair, SER_NETWORK, PROTOCOL_VERSION);
744 std::vector<unsigned char> CMalleablePubKey::Raw() const
746 CDataStream ssKey(SER_NETWORK, PROTOCOL_VERSION);
748 std::vector<unsigned char> vch(ssKey.begin(), ssKey.end());
753 bool CMalleablePubKey::SetString(const std::string& strMalleablePubKey)
755 std::vector<unsigned char> vchTemp;
756 if (!DecodeBase58Check(strMalleablePubKey, vchTemp)) {
757 throw key_error("CMalleablePubKey::SetString() : Provided key data seems corrupted.");
759 if (vchTemp.size() != 68)
762 CDataStream ssKey(vchTemp, SER_NETWORK, PROTOCOL_VERSION);
768 bool CMalleablePubKey::operator==(const CMalleablePubKey &b)
770 return pubKeyL == b.pubKeyL && pubKeyH == b.pubKeyH;
776 void CMalleableKey::Reset()
782 void CMalleableKey::MakeNewKeys()
790 vchSecretL = keyL.GetSecret();
791 vchSecretH = keyH.GetSecret();
794 CMalleableKey::CMalleableKey()
799 CMalleableKey::CMalleableKey(const CMalleableKey &b)
801 SetSecrets(b.vchSecretL, b.vchSecretH);
804 CMalleableKey::CMalleableKey(const CSecret &L, const CSecret &H)
809 CMalleableKey::~CMalleableKey()
813 bool CMalleableKey::IsNull() const
815 return vchSecretL.size() != 32 || vchSecretH.size() != 32;
818 bool CMalleableKey::SetSecrets(const CSecret &pvchSecretL, const CSecret &pvchSecretH)
822 CKey keyL(pvchSecretL);
823 CKey keyH(pvchSecretH);
825 if (!keyL.IsValid() || !keyH.IsValid())
828 vchSecretL = pvchSecretL;
829 vchSecretH = pvchSecretH;
834 CMalleablePubKey CMalleableKey::GetMalleablePubKey() const
836 CKey L(vchSecretL), H(vchSecretH);
837 return CMalleablePubKey(L.GetPubKey(), H.GetPubKey());
841 bool CMalleableKey::CheckKeyVariant(const CPubKey &R, const CPubKey &vchPubKeyVariant) const
844 throw key_error("CMalleableKey::CheckKeyVariant() : Attempting to run on NULL key object.");
848 printf("CMalleableKey::CheckKeyVariant() : R is invalid");
852 if (!vchPubKeyVariant.IsValid()) {
853 printf("CMalleableKey::CheckKeyVariant() : public key variant is invalid");
858 if (!point_R.setPubKey(R)) {
859 printf("CMalleableKey::CheckKeyVariant() : Unable to decode R value");
864 CPubKey vchPubKeyH = H.GetPubKey();
867 if (!point_H.setPubKey(vchPubKeyH)) {
868 printf("CMalleableKey::CheckKeyVariant() : Unable to decode H value");
873 if (!point_P.setPubKey(vchPubKeyVariant)) {
874 printf("CMalleableKey::CheckKeyVariant() : Unable to decode P value");
878 // Infinity points are senseless
879 if (point_P.IsInfinity()) {
880 printf("CMalleableKey::CheckKeyVariant() : P is infinity");
885 bnl.setBytes(std::vector<unsigned char>(vchSecretL.begin(), vchSecretL.end()));
889 std::vector<unsigned char> vchRl;
890 if (!point_R.getBytes(vchRl)) {
891 printf("CMalleableKey::CheckKeyVariant() : Unable to convert Rl value");
895 // Calculate Hash(R*l)
897 bnHash.setuint160(Hash160(vchRl));
900 // Calculate Ps = Hash(L*r)*G + H
901 point_Ps.ECMULGEN(bnHash, point_H);
903 // Infinity points are senseless
904 if (point_Ps.IsInfinity()) {
905 printf("CMalleableKey::CheckKeyVariant() : Ps is infinity");
910 if (point_Ps != point_P) {
917 // Check ownership and restore private key
918 bool CMalleableKey::CheckKeyVariant(const CPubKey &R, const CPubKey &vchPubKeyVariant, CKey &privKeyVariant) const
921 throw key_error("CMalleableKey::CheckKeyVariant() : Attempting to run on NULL key object.");
925 printf("CMalleableKey::CheckKeyVariant() : R is invalid");
929 if (!vchPubKeyVariant.IsValid()) {
930 printf("CMalleableKey::CheckKeyVariant() : public key variant is invalid");
935 if (!point_R.setPubKey(R)) {
936 printf("CMalleableKey::CheckKeyVariant() : Unable to decode R value");
941 CPubKey vchPubKeyH = H.GetPubKey();
944 if (!point_H.setPubKey(vchPubKeyH)) {
945 printf("CMalleableKey::CheckKeyVariant() : Unable to decode H value");
950 if (!point_P.setPubKey(vchPubKeyVariant)) {
951 printf("CMalleableKey::CheckKeyVariant() : Unable to decode P value");
955 // Infinity points are senseless
956 if (point_P.IsInfinity()) {
957 printf("CMalleableKey::CheckKeyVariant() : P is infinity");
962 bnl.setBytes(std::vector<unsigned char>(vchSecretL.begin(), vchSecretL.end()));
966 std::vector<unsigned char> vchRl;
967 if (!point_R.getBytes(vchRl)) {
968 printf("CMalleableKey::CheckKeyVariant() : Unable to convert Rl value");
972 // Calculate Hash(R*l)
974 bnHash.setuint160(Hash160(vchRl));
977 // Calculate Ps = Hash(L*r)*G + H
978 point_Ps.ECMULGEN(bnHash, point_H);
980 // Infinity points are senseless
981 if (point_Ps.IsInfinity()) {
982 printf("CMalleableKey::CheckKeyVariant() : Ps is infinity");
987 if (point_Ps != point_P) {
991 // OpenSSL BIGNUM representation of the second private key from (l, h) pair
993 bnh.setBytes(std::vector<unsigned char>(vchSecretH.begin(), vchSecretH.end()));
995 // Calculate p = Hash(R*l) + h
996 CBigNum bnp = bnHash + bnh;
998 std::vector<unsigned char> vchp = bnp.getBytes();
999 privKeyVariant.SetSecret(CSecret(vchp.begin(), vchp.end()));
1004 std::string CMalleableKey::ToString() const
1006 CDataStream ssKey(SER_NETWORK, PROTOCOL_VERSION);
1008 std::vector<unsigned char> vch(ssKey.begin(), ssKey.end());
1010 return EncodeBase58Check(vch);
1013 std::vector<unsigned char> CMalleableKey::Raw() const
1015 CDataStream ssKey(SER_NETWORK, PROTOCOL_VERSION);
1017 std::vector<unsigned char> vch(ssKey.begin(), ssKey.end());
1022 bool CMalleableKey::SetString(const std::string& strMutableKey)
1024 std::vector<unsigned char> vchTemp;
1025 if (!DecodeBase58Check(strMutableKey, vchTemp)) {
1026 throw key_error("CMalleableKey::SetString() : Provided key data seems corrupted.");
1028 if (vchTemp.size() != 66)
1030 CDataStream ssKey(vchTemp, SER_NETWORK, PROTOCOL_VERSION);
1036 // CMalleableKeyView
1038 CMalleableKeyView::CMalleableKeyView(const std::string &strMalleableKey)
1040 SetString(strMalleableKey);
1043 CMalleableKeyView::CMalleableKeyView(const CMalleableKey &b)
1045 if (b.vchSecretL.size() != 32)
1046 throw key_error("CMalleableKeyView::CMalleableKeyView() : L size must be 32 bytes");
1048 if (b.vchSecretH.size() != 32)
1049 throw key_error("CMalleableKeyView::CMalleableKeyView() : H size must be 32 bytes");
1051 vchSecretL = b.vchSecretL;
1053 CKey H(b.vchSecretH);
1054 vchPubKeyH = H.GetPubKey();
1057 CMalleableKeyView::CMalleableKeyView(const CMalleableKeyView &b)
1059 vchSecretL = b.vchSecretL;
1060 vchPubKeyH = b.vchPubKeyH;
1063 CMalleableKeyView& CMalleableKeyView::operator=(const CMalleableKey &b)
1065 vchSecretL = b.vchSecretL;
1067 CKey H(b.vchSecretH);
1068 vchPubKeyH = H.GetPubKey();
1073 CMalleableKeyView::~CMalleableKeyView()
1077 CMalleablePubKey CMalleableKeyView::GetMalleablePubKey() const
1079 CKey keyL(vchSecretL);
1080 return CMalleablePubKey(keyL.GetPubKey(), vchPubKeyH);
1084 bool CMalleableKeyView::CheckKeyVariant(const CPubKey &R, const CPubKey &vchPubKeyVariant) const
1087 throw key_error("CMalleableKeyView::CheckKeyVariant() : Attempting to run on invalid view object.");
1091 printf("CMalleableKeyView::CheckKeyVariant() : R is invalid");
1095 if (!vchPubKeyVariant.IsValid()) {
1096 printf("CMalleableKeyView::CheckKeyVariant() : public key variant is invalid");
1101 if (!point_R.setPubKey(R)) {
1102 printf("CMalleableKeyView::CheckKeyVariant() : Unable to decode R value");
1107 if (!point_H.setPubKey(vchPubKeyH)) {
1108 printf("CMalleableKeyView::CheckKeyVariant() : Unable to decode H value");
1113 if (!point_P.setPubKey(vchPubKeyVariant)) {
1114 printf("CMalleableKeyView::CheckKeyVariant() : Unable to decode P value");
1118 // Infinity points are senseless
1119 if (point_P.IsInfinity()) {
1120 printf("CMalleableKeyView::CheckKeyVariant() : P is infinity");
1125 bnl.setBytes(std::vector<unsigned char>(vchSecretL.begin(), vchSecretL.end()));
1129 std::vector<unsigned char> vchRl;
1130 if (!point_R.getBytes(vchRl)) {
1131 printf("CMalleableKeyView::CheckKeyVariant() : Unable to convert Rl value");
1135 // Calculate Hash(R*l)
1137 bnHash.setuint160(Hash160(vchRl));
1140 // Calculate Ps = Hash(L*r)*G + H
1141 point_Ps.ECMULGEN(bnHash, point_H);
1143 // Infinity points are senseless
1144 if (point_Ps.IsInfinity()) {
1145 printf("CMalleableKeyView::CheckKeyVariant() : Ps is infinity");
1150 if (point_Ps != point_P) {
1157 std::string CMalleableKeyView::ToString() const
1159 CDataStream ssKey(SER_NETWORK, PROTOCOL_VERSION);
1161 std::vector<unsigned char> vch(ssKey.begin(), ssKey.end());
1163 return EncodeBase58Check(vch);
1166 bool CMalleableKeyView::SetString(const std::string& strMutableKey)
1168 std::vector<unsigned char> vchTemp;
1169 if (!DecodeBase58Check(strMutableKey, vchTemp)) {
1170 throw key_error("CMalleableKeyView::SetString() : Provided key data seems corrupted.");
1173 if (vchTemp.size() != 67)
1176 CDataStream ssKey(vchTemp, SER_NETWORK, PROTOCOL_VERSION);
1182 std::vector<unsigned char> CMalleableKeyView::Raw() const
1184 CDataStream ssKey(SER_NETWORK, PROTOCOL_VERSION);
1186 std::vector<unsigned char> vch(ssKey.begin(), ssKey.end());
1192 bool CMalleableKeyView::IsValid() const
1194 return vchSecretL.size() == 32 && GetMalleablePubKey().IsValid();
1197 //// Asymmetric encryption
1199 void CPubKey::EncryptData(const std::vector<unsigned char>& data, std::vector<unsigned char>& encrypted)
1202 char error[1024] = "Unknown error";
1203 cryptogram_t *cryptogram;
1205 const unsigned char* pbegin = &vbytes[0];
1206 EC_KEY *pkey = EC_KEY_new_by_curve_name(NID_secp256k1);
1207 if (!o2i_ECPublicKey(&pkey, &pbegin, size()))
1208 throw key_error("Unable to parse EC key");
1210 ctx = create_context(pkey);
1211 if (!EC_KEY_get0_public_key(ctx->user_key))
1212 throw key_error("Given EC key is not public key");
1214 cryptogram = ecies_encrypt(ctx, (unsigned char*)&data[0], data.size(), error);
1215 if (cryptogram == NULL) {
1218 throw key_error(std::string("Error in encryption: %s") + error);
1221 encrypted.resize(cryptogram_data_sum_length(cryptogram));
1222 unsigned char *key_data = cryptogram_key_data(cryptogram);
1223 memcpy(&encrypted[0], key_data, encrypted.size());
1224 cryptogram_free(cryptogram);
1228 void CKey::DecryptData(const std::vector<unsigned char>& encrypted, std::vector<unsigned char>& data)
1231 char error[1024] = "Unknown error";
1232 cryptogram_t *cryptogram;
1234 unsigned char *decrypted;
1236 ctx = create_context(pkey);
1237 if (!EC_KEY_get0_private_key(ctx->user_key))
1238 throw key_error("Given EC key is not private key");
1240 size_t key_length = ctx->stored_key_length;
1241 size_t mac_length = EVP_MD_size(ctx->md);
1242 cryptogram = cryptogram_alloc(key_length, mac_length, encrypted.size() - key_length - mac_length);
1244 memcpy(cryptogram_key_data(cryptogram), &encrypted[0], encrypted.size());
1246 decrypted = ecies_decrypt(ctx, cryptogram, &length, error);
1247 cryptogram_free(cryptogram);
1250 if (decrypted == NULL) {
1251 throw key_error(std::string("Error in decryption: %s") + error);
1254 data.resize(length);
1255 memcpy(&data[0], decrypted, length);