X-Git-Url: https://git.novaco.in/?p=novacoin.git;a=blobdiff_plain;f=src%2Fkey.h;h=cb5a7122c27aaba0ed30d44366c5bfeacc2ddc38;hp=4058f115fdd461a2a36db4909e7c1ba8e4e55576;hb=3e59ebf3286bcd620e6ff79fa84eb9aa50a6c59e;hpb=3a4d81724e873f967b74759d539e05c73f95aeeb

diff --git a/src/key.h b/src/key.h
index 4058f11..cb5a712 100644
--- a/src/key.h
+++ b/src/key.h
@@ -1,19 +1,21 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
 // 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.
 #ifndef BITCOIN_KEY_H
 #define BITCOIN_KEY_H
 
 #include <stdexcept>
 #include <vector>
 
-#include <openssl/ec.h>
-#include <openssl/ecdsa.h>
-#include <openssl/obj_mac.h>
-
+#include "allocators.h"
 #include "serialize.h"
 #include "uint256.h"
+#include "hash.h"
+#include "bignum.h"
+#include "ies.h"
+
+#include <openssl/ec.h> // for EC_KEY definition
 
 // secp160k1
 // const unsigned int PRIVATE_KEY_SIZE = 192;
@@ -38,290 +40,397 @@
 // see www.keylength.com
 // script supports up to 75 for single byte push
 
-int extern EC_KEY_regenerate_key(EC_KEY *eckey, BIGNUM *priv_key);
-int extern ECDSA_SIG_recover_key_GFp(EC_KEY *eckey, ECDSA_SIG *ecsig, const unsigned char *msg, int msglen, int recid, int check);
-
 class key_error : public std::runtime_error
 {
 public:
     explicit key_error(const std::string& str) : std::runtime_error(str) {}
 };
 
+/** A reference to a CKey: the Hash160 of its serialized public key */
+class CKeyID : public uint160
+{
+public:
+    CKeyID() : uint160(0) { }
+    CKeyID(const uint160 &in) : uint160(in) { }
+};
 
-// secure_allocator is defined in serialize.h
-// CPrivKey is a serialized private key, with all parameters included (279 bytes)
-typedef std::vector<unsigned char, secure_allocator<unsigned char> > CPrivKey;
-// CSecret is a serialization of just the secret parameter (32 bytes)
-typedef std::vector<unsigned char, secure_allocator<unsigned char> > CSecret;
-
-class CKey
+/** A reference to a CScript: the Hash160 of its serialization (see script.h) */
+class CScriptID : public uint160
 {
-protected:
-    EC_KEY* pkey;
-    bool fSet;
-    bool fCompressedPubKey;
+public:
+    CScriptID() : uint160(0) { }
+    CScriptID(const uint160 &in) : uint160(in) { }
+};
 
-    void SetCompressedPubKey()
-    {
-        EC_KEY_set_conv_form(pkey, POINT_CONVERSION_COMPRESSED);
-        fCompressedPubKey = true;
-    }
+/** An encapsulated OpenSSL Elliptic Curve key (public) */
+class CPubKey
+{
+private:
 
-public:
+    /**
+     * Just store the serialized data.
+     * Its length can very cheaply be computed from the first byte.
+     */
+    unsigned char vbytes[65];
 
-    void Reset()
+    //! Compute the length of a pubkey with a given first byte.
+    unsigned int static GetLen(unsigned char chHeader)
     {
-        fCompressedPubKey = false;
-        pkey = EC_KEY_new_by_curve_name(NID_secp256k1);
-        if (pkey == NULL)
-            throw key_error("CKey::CKey() : EC_KEY_new_by_curve_name failed");
-        fSet = false;
+        if (chHeader == 2 || chHeader == 3)
+            return 33;
+        if (chHeader == 4 || chHeader == 6 || chHeader == 7)
+            return 65;
+        return 0;
     }
 
-    CKey()
+    // Set this key data to be invalid
+    void Invalidate()
     {
-        Reset();
+        vbytes[0] = 0xFF;
     }
 
-    CKey(const CKey& b)
+public:
+    // Construct an invalid public key.
+    CPubKey()
     {
-        pkey = EC_KEY_dup(b.pkey);
-        if (pkey == NULL)
-            throw key_error("CKey::CKey(const CKey&) : EC_KEY_dup failed");
-        fSet = b.fSet;
+        Invalidate();
     }
 
-    CKey& operator=(const CKey& b)
+    // Initialize a public key using begin/end iterators to byte data.
+    template <typename T>
+    void Set(const T pbegin, const T pend)
     {
-        if (!EC_KEY_copy(pkey, b.pkey))
-            throw key_error("CKey::operator=(const CKey&) : EC_KEY_copy failed");
-        fSet = b.fSet;
-        return (*this);
+        int len = pend == pbegin ? 0 : GetLen(pbegin[0]);
+        if (len && len == (pend - pbegin))
+            memcpy(vbytes, (unsigned char*)&pbegin[0], len);
+        else
+            Invalidate();
     }
 
-    ~CKey()
+    void Set(const std::vector<unsigned char>& vch)
     {
-        EC_KEY_free(pkey);
+        Set(vch.begin(), vch.end());
     }
 
-    bool IsNull() const
+    template <typename T>
+    CPubKey(const T pbegin, const T pend)
     {
-        return !fSet;
+        Set(pbegin, pend);
     }
 
-    bool IsCompressed() const
+    CPubKey(const std::vector<unsigned char>& vch)
     {
-        return fCompressedPubKey;
+        Set(vch.begin(), vch.end());
     }
 
-    void MakeNewKey(bool fCompressed)
+    // Read-only vector-like interface to the data.
+    unsigned int size() const { return GetLen(vbytes[0]); }
+    const unsigned char* begin() const { return vbytes; }
+    const unsigned char* end() const { return vbytes + size(); }
+    const unsigned char& operator[](unsigned int pos) const { return vbytes[pos]; }
+
+    friend bool operator==(const CPubKey& a, const CPubKey& b) { return a.vbytes[0] == b.vbytes[0] && memcmp(a.vbytes, b.vbytes, a.size()) == 0; }
+    friend bool operator!=(const CPubKey& a, const CPubKey& b) { return !(a == b); }
+    friend bool operator<(const CPubKey& a, const CPubKey& b)  { return a.vbytes[0] < b.vbytes[0] || (a.vbytes[0] == b.vbytes[0] && memcmp(a.vbytes, b.vbytes, a.size()) < 0); }
+
+    //! Implement serialization, as if this was a byte vector.
+    unsigned int GetSerializeSize(int nType, int nVersion) const
     {
-        if (!EC_KEY_generate_key(pkey))
-            throw key_error("CKey::MakeNewKey() : EC_KEY_generate_key failed");
-        if (fCompressed)
-            SetCompressedPubKey();
-        fSet = true;
+        return size() + 1;
     }
-
-    bool SetPrivKey(const CPrivKey& vchPrivKey)
+    template <typename Stream>
+    void Serialize(Stream& s, int nType, int nVersion) const
     {
-        const unsigned char* pbegin = &vchPrivKey[0];
-        if (!d2i_ECPrivateKey(&pkey, &pbegin, vchPrivKey.size()))
-            return false;
-        fSet = true;
-        return true;
+        unsigned int len = size();
+        ::WriteCompactSize(s, len);
+        s.write((char*)vbytes, len);
     }
-
-    bool SetSecret(const CSecret& vchSecret, bool fCompressed = false)
+    template <typename Stream>
+    void Unserialize(Stream& s, int nType, int nVersion)
     {
-        EC_KEY_free(pkey);
-        pkey = EC_KEY_new_by_curve_name(NID_secp256k1);
-        if (pkey == NULL)
-            throw key_error("CKey::SetSecret() : EC_KEY_new_by_curve_name failed");
-        if (vchSecret.size() != 32)
-            throw key_error("CKey::SetSecret() : secret must be 32 bytes");
-        BIGNUM *bn = BN_bin2bn(&vchSecret[0],32,BN_new());
-        if (bn == NULL)
-            throw key_error("CKey::SetSecret() : BN_bin2bn failed");
-        if (!EC_KEY_regenerate_key(pkey,bn))
-        {
-            BN_clear_free(bn);
-            throw key_error("CKey::SetSecret() : EC_KEY_regenerate_key failed");
+        unsigned int len = ::ReadCompactSize(s);
+        if (len <= 65) {
+            s.read((char*)vbytes, len);
+        } else {
+            // invalid pubkey, skip available data
+            char dummy;
+            while (len--)
+                s.read(&dummy, 1);
+            Invalidate();
         }
-        BN_clear_free(bn);
-        fSet = true;
-        if (fCompressed || fCompressedPubKey)
-            SetCompressedPubKey();
-        return true;
     }
 
-    CSecret GetSecret(bool &fCompressed) const
+    CKeyID GetID() const
     {
-        CSecret vchRet;
-        vchRet.resize(32);
-        const BIGNUM *bn = EC_KEY_get0_private_key(pkey);
-        int nBytes = BN_num_bytes(bn);
-        if (bn == NULL)
-            throw key_error("CKey::GetSecret() : EC_KEY_get0_private_key failed");
-        int n=BN_bn2bin(bn,&vchRet[32 - nBytes]);
-        if (n != nBytes) 
-            throw key_error("CKey::GetSecret(): BN_bn2bin failed");
-        fCompressed = fCompressedPubKey;
-        return vchRet;
+        return CKeyID(Hash160(vbytes, vbytes + size()));
     }
 
-    CPrivKey GetPrivKey() const
+    uint256 GetHash() const
     {
-        unsigned int nSize = i2d_ECPrivateKey(pkey, NULL);
-        if (!nSize)
-            throw key_error("CKey::GetPrivKey() : i2d_ECPrivateKey failed");
-        CPrivKey vchPrivKey(nSize, 0);
-        unsigned char* pbegin = &vchPrivKey[0];
-        if (i2d_ECPrivateKey(pkey, &pbegin) != nSize)
-            throw key_error("CKey::GetPrivKey() : i2d_ECPrivateKey returned unexpected size");
-        return vchPrivKey;
+        return Hash(vbytes, vbytes + size());
     }
 
-    bool SetPubKey(const std::vector<unsigned char>& vchPubKey)
+    /*
+     * Check syntactic correctness.
+     *
+     * Note that this is consensus critical as CheckSig() calls it!
+     */
+    bool IsValid() const
     {
-        const unsigned char* pbegin = &vchPubKey[0];
-        if (!o2i_ECPublicKey(&pkey, &pbegin, vchPubKey.size()))
-            return false;
-        fSet = true;
-        if (vchPubKey.size() == 33)
-            SetCompressedPubKey();
-        return true;
+        return size() > 0;
     }
 
-    std::vector<unsigned char> GetPubKey() const
+    //! fully validate whether this is a valid public key (more expensive than IsValid())
+    bool IsFullyValid() const
     {
-        unsigned int nSize = i2o_ECPublicKey(pkey, NULL);
-        if (!nSize)
-            throw key_error("CKey::GetPubKey() : i2o_ECPublicKey failed");
-        std::vector<unsigned char> vchPubKey(nSize, 0);
-        unsigned char* pbegin = &vchPubKey[0];
-        if (i2o_ECPublicKey(pkey, &pbegin) != nSize)
-            throw key_error("CKey::GetPubKey() : i2o_ECPublicKey returned unexpected size");
-        return vchPubKey;
+        const unsigned char* pbegin = &vbytes[0];
+        EC_KEY *pkey = EC_KEY_new_by_curve_name(NID_secp256k1);
+        if (o2i_ECPublicKey(&pkey, &pbegin, size()))
+        {
+            EC_KEY_free(pkey);
+            return true;
+        }
+        return false;
     }
 
-    bool Sign(uint256 hash, std::vector<unsigned char>& vchSig)
+    //! Check whether this is a compressed public key.
+    bool IsCompressed() const
     {
-        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;
+        return size() == 33;
     }
 
+    bool Verify(const uint256& hash, const std::vector<unsigned char>& vchSig) const;
+    bool VerifyCompact(uint256 hash, const std::vector<unsigned char>& vchSig);
+
+    bool SetCompactSignature(uint256 hash, const std::vector<unsigned char>& vchSig);
+
+    // Reserialize to DER
+    static bool ReserealizeSignature(std::vector<unsigned char>& vchSig);
+
+    // Encrypt data
+    void EncryptData(const std::vector<unsigned char>& data, std::vector<unsigned char>& encrypted);
+};
+
+// secure_allocator is defined in allocators.h
+// CPrivKey is a serialized private key, with all parameters included (279 bytes)
+typedef std::vector<unsigned char, secure_allocator<unsigned char> > CPrivKey;
+// CSecret is a serialization of just the secret parameter (32 bytes)
+typedef std::vector<unsigned char, secure_allocator<unsigned char> > CSecret;
+
+/** An encapsulated OpenSSL Elliptic Curve key (private) */
+class CKey
+{
+protected:
+    EC_KEY* pkey;
+    bool fSet;
+
+public:
+
+    void Reset();
+
+    CKey();
+    CKey(const CKey& b);
+    CKey(const CSecret& b, bool fCompressed=true);
+
+    CKey& operator=(const CKey& b);
+
+    ~CKey();
+
+    bool IsNull() const;
+    bool IsCompressed() const;
+
+    void SetCompressedPubKey(bool fCompressed=true);
+    void MakeNewKey(bool fCompressed=true);
+    bool SetPrivKey(const CPrivKey& vchPrivKey);
+    bool SetSecret(const CSecret& vchSecret, bool fCompressed = true);
+    CSecret GetSecret(bool &fCompressed) const;
+    CSecret GetSecret() const;
+    CPrivKey GetPrivKey() const;
+    CPubKey GetPubKey() const;
+    bool WritePEM(BIO *streamObj, const SecureString &strPassKey) const;
+
+    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 SignCompact(uint256 hash, std::vector<unsigned char>& vchSig);
+
+    bool IsValid();
+
+    // Check whether an element of a signature (r or s) is valid.
+    static bool CheckSignatureElement(const unsigned char *vch, int len, bool half);
+
+    // Decrypt data
+    void DecryptData(const std::vector<unsigned char>& encrypted, std::vector<unsigned char>& data);
+};
+
+class CPoint
+{
+private:
+    EC_POINT *point;
+    EC_GROUP* group;
+    BN_CTX* ctx;
+
+public:
+    CPoint();
+    bool operator!=(const CPoint &a);
+    ~CPoint();
+
+    // Initialize from octets stream
+    bool setBytes(const std::vector<unsigned char> &vchBytes);
+
+    // Initialize from pubkey
+    bool setPubKey(const CPubKey &vchPubKey);
+
+    // Serialize to octets stream
+    bool getBytes(std::vector<unsigned char> &vchBytes);
+
+    // ECC multiplication by specified multiplier
+    bool ECMUL(const CBigNum &bnMultiplier);
+
+    // Calculate G*m + q
+    bool ECMULGEN(const CBigNum &bnMultiplier, const CPoint &qPoint);
+
+    bool IsInfinity() { return EC_POINT_is_at_infinity(group, point) != 0; }
+};
+
+class CMalleablePubKey
+{
+private:
+    CPubKey pubKeyL;
+    CPubKey pubKeyH;
+    friend class CMalleableKey;
+
+    static const unsigned char CURRENT_VERSION = 1;
+
+public:
+    CMalleablePubKey() { }
+    CMalleablePubKey(const CMalleablePubKey& mpk)
     {
-        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;
+        pubKeyL = mpk.pubKeyL;
+        pubKeyH = mpk.pubKeyH;
     }
+    CMalleablePubKey(const std::vector<unsigned char> &vchPubKeyPair) { setvch(vchPubKeyPair); }
+    CMalleablePubKey(const std::string& strMalleablePubKey) { SetString(strMalleablePubKey); }
+    CMalleablePubKey(const CPubKey &pubKeyInL, const CPubKey &pubKeyInH) : pubKeyL(pubKeyInL), pubKeyH(pubKeyInH) { }
 
-    // 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);
-
-        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;
+    IMPLEMENT_SERIALIZE(
+        READWRITE(pubKeyL);
+        READWRITE(pubKeyH);
+    )
+
+    bool IsValid() const {
+        return pubKeyL.IsValid() && pubKeyH.IsValid();
     }
 
-    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 operator==(const CMalleablePubKey &b);
+    bool operator!=(const CMalleablePubKey &b) { return !(*this == b); }
+    CMalleablePubKey& operator=(const CMalleablePubKey& mpk) {
+        pubKeyL = mpk.pubKeyL;
+        pubKeyH = mpk.pubKeyH;
+        return *this;
     }
 
-    // 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;
+    std::string ToString() const;
+    bool SetString(const std::string& strMalleablePubKey);
+
+    CKeyID GetID() const {
+        return pubKeyL.GetID();
     }
 
-    bool IsValid()
-    {
-        if (!fSet)
-            return false;
-
-        bool fCompr;
-        CSecret secret = GetSecret(fCompr);
-        CKey key2;
-        key2.SetSecret(secret, fCompr);
-        return GetPubKey() == key2.GetPubKey();
+    bool setvch(const std::vector<unsigned char> &vchPubKeyPair);
+    std::vector<unsigned char> Raw() const;
+
+    CPubKey& GetL() { return pubKeyL; }
+    CPubKey& GetH() { return pubKeyH; }
+    void GetVariant(CPubKey &R, CPubKey &vchPubKeyVariant);
+};
+
+class CMalleableKey
+{
+private:
+    CSecret vchSecretL;
+    CSecret vchSecretH;
+
+    friend class CMalleableKeyView;
+
+public:
+    CMalleableKey();
+    CMalleableKey(const CMalleableKey &b);
+    CMalleableKey(const CSecret &L, const CSecret &H);
+    ~CMalleableKey();
+
+    IMPLEMENT_SERIALIZE(
+        READWRITE(vchSecretL);
+        READWRITE(vchSecretH);
+    )
+
+    std::string ToString() const;
+    bool SetString(const std::string& strMalleablePubKey);
+    std::vector<unsigned char> Raw() const;
+    CMalleableKey& operator=(const CMalleableKey& mk) {
+        vchSecretL = mk.vchSecretL;
+        vchSecretH = mk.vchSecretH;
+        return *this;
+    }
+
+    void Reset();
+    void MakeNewKeys();
+    bool IsNull() const;
+    bool IsValid() const { return !IsNull() && GetMalleablePubKey().IsValid(); }
+    bool SetSecrets(const CSecret &pvchSecretL, const CSecret &pvchSecretH);
+
+    CSecret GetSecretL() const { return vchSecretL; }
+    CSecret GetSecretH() const { return vchSecretH; }
+
+    CKeyID GetID() const {
+        return GetMalleablePubKey().GetID();
+    }
+    CMalleablePubKey GetMalleablePubKey() const;
+    bool CheckKeyVariant(const CPubKey &R, const CPubKey &vchPubKeyVariant) const;
+    bool CheckKeyVariant(const CPubKey &R, const CPubKey &vchPubKeyVariant, CKey &privKeyVariant) const;
+};
+
+class CMalleableKeyView
+{
+private:
+    CSecret vchSecretL;
+    CPubKey vchPubKeyH;
+
+public:
+    CMalleableKeyView() { };
+    CMalleableKeyView(const CMalleableKey &b);
+    CMalleableKeyView(const std::string &strMalleableKey);
+
+    CMalleableKeyView(const CMalleableKeyView &b);
+    CMalleableKeyView& operator=(const CMalleableKey &b);
+    ~CMalleableKeyView();
+
+    IMPLEMENT_SERIALIZE(
+        READWRITE(vchSecretL);
+        READWRITE(vchPubKeyH);
+    )
+
+    bool IsValid() const;
+    std::string ToString() const;
+    bool SetString(const std::string& strMalleablePubKey);
+    std::vector<unsigned char> Raw() const;
+    CMalleableKeyView& operator=(const CMalleableKeyView& mkv) {
+        vchSecretL = mkv.vchSecretL;
+        vchPubKeyH = mkv.vchPubKeyH;
+        return *this;
     }
+
+    CKeyID GetID() const {
+        return GetMalleablePubKey().GetID();
+    }
+    CMalleablePubKey GetMalleablePubKey() const;
+    CMalleableKey GetMalleableKey(const CSecret &vchSecretH) const { return CMalleableKey(vchSecretL, vchSecretH); }
+    bool CheckKeyVariant(const CPubKey &R, const CPubKey &vchPubKeyVariant) const;
+
+    bool operator <(const CMalleableKeyView& kv) const { return vchPubKeyH.GetID() < kv.vchPubKeyH.GetID(); }
 };
 
 #endif