X-Git-Url: https://git.novaco.in/?p=novacoin.git;a=blobdiff_plain;f=src%2Fkey.h;h=cb5a7122c27aaba0ed30d44366c5bfeacc2ddc38;hp=e329cf04effb72986fc6a2a87ee15f13490d2455;hb=3e59ebf3286bcd620e6ff79fa84eb9aa50a6c59e;hpb=42c55f2e8a14a2f1c504cfe62e3d1717e8ac5454

diff --git a/src/key.h b/src/key.h
index e329cf0..cb5a712 100644
--- a/src/key.h
+++ b/src/key.h
@@ -13,6 +13,7 @@
 #include "uint256.h"
 #include "hash.h"
 #include "bignum.h"
+#include "ies.h"
 
 #include <openssl/ec.h> // for EC_KEY definition
 
@@ -61,44 +62,154 @@ public:
     CScriptID(const uint160 &in) : uint160(in) { }
 };
 
-/** An encapsulated public key. */
-class CPubKey {
+/** An encapsulated OpenSSL Elliptic Curve key (public) */
+class CPubKey
+{
 private:
-    std::vector<unsigned char> vchPubKey;
-    friend class CKey;
+
+    /**
+     * Just store the serialized data.
+     * Its length can very cheaply be computed from the first byte.
+     */
+    unsigned char vbytes[65];
+
+    //! Compute the length of a pubkey with a given first byte.
+    unsigned int static GetLen(unsigned char chHeader)
+    {
+        if (chHeader == 2 || chHeader == 3)
+            return 33;
+        if (chHeader == 4 || chHeader == 6 || chHeader == 7)
+            return 65;
+        return 0;
+    }
+
+    // Set this key data to be invalid
+    void Invalidate()
+    {
+        vbytes[0] = 0xFF;
+    }
 
 public:
-    CPubKey() { }
-    CPubKey(const std::vector<unsigned char> &vchPubKeyIn) : vchPubKey(vchPubKeyIn) { }
-    friend bool operator==(const CPubKey &a, const CPubKey &b) { return a.vchPubKey == b.vchPubKey; }
-    friend bool operator!=(const CPubKey &a, const CPubKey &b) { return a.vchPubKey != b.vchPubKey; }
-    friend bool operator<(const CPubKey &a, const CPubKey &b) { return a.vchPubKey < b.vchPubKey; }
+    // Construct an invalid public key.
+    CPubKey()
+    {
+        Invalidate();
+    }
 
-    IMPLEMENT_SERIALIZE(
-        READWRITE(vchPubKey);
-    )
+    // Initialize a public key using begin/end iterators to byte data.
+    template <typename T>
+    void Set(const T pbegin, const T pend)
+    {
+        int len = pend == pbegin ? 0 : GetLen(pbegin[0]);
+        if (len && len == (pend - pbegin))
+            memcpy(vbytes, (unsigned char*)&pbegin[0], len);
+        else
+            Invalidate();
+    }
 
-    CKeyID GetID() const {
-        return CKeyID(Hash160(vchPubKey));
+    void Set(const std::vector<unsigned char>& vch)
+    {
+        Set(vch.begin(), vch.end());
     }
 
-    uint256 GetHash() const {
-        return Hash(vchPubKey.begin(), vchPubKey.end());
+    template <typename T>
+    CPubKey(const T pbegin, const T pend)
+    {
+        Set(pbegin, pend);
     }
 
-    bool IsValid() const {
-        return vchPubKey.size() == 33 || vchPubKey.size() == 65;
+    CPubKey(const std::vector<unsigned char>& vch)
+    {
+        Set(vch.begin(), vch.end());
+    }
+
+    // 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
+    {
+        return size() + 1;
+    }
+    template <typename Stream>
+    void Serialize(Stream& s, int nType, int nVersion) const
+    {
+        unsigned int len = size();
+        ::WriteCompactSize(s, len);
+        s.write((char*)vbytes, len);
+    }
+    template <typename Stream>
+    void Unserialize(Stream& s, int nType, int nVersion)
+    {
+        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();
+        }
     }
 
-    bool IsCompressed() const {
-        return vchPubKey.size() == 33;
+    CKeyID GetID() const
+    {
+        return CKeyID(Hash160(vbytes, vbytes + size()));
     }
 
-    std::vector<unsigned char> Raw() const {
-        return vchPubKey;
+    uint256 GetHash() const
+    {
+        return Hash(vbytes, vbytes + size());
+    }
+
+    /*
+     * Check syntactic correctness.
+     *
+     * Note that this is consensus critical as CheckSig() calls it!
+     */
+    bool IsValid() const
+    {
+        return size() > 0;
+    }
+
+    //! fully validate whether this is a valid public key (more expensive than IsValid())
+    bool IsFullyValid() const
+    {
+        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;
+    }
+
+    //! Check whether this is a compressed public key.
+    bool IsCompressed() const
+    {
+        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)
@@ -106,15 +217,12 @@ 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 (public and/or private) */
+/** An encapsulated OpenSSL Elliptic Curve key (private) */
 class CKey
 {
 protected:
     EC_KEY* pkey;
     bool fSet;
-    bool fCompressedPubKey;
-
-    void SetCompressedPubKey();
 
 public:
 
@@ -122,6 +230,7 @@ public:
 
     CKey();
     CKey(const CKey& b);
+    CKey(const CSecret& b, bool fCompressed=true);
 
     CKey& operator=(const CKey& b);
 
@@ -130,13 +239,15 @@ public:
     bool IsNull() const;
     bool IsCompressed() const;
 
-    void MakeNewKey(bool fCompressed);
+    void SetCompressedPubKey(bool fCompressed=true);
+    void MakeNewKey(bool fCompressed=true);
     bool SetPrivKey(const CPrivKey& vchPrivKey);
-    bool SetSecret(const CSecret& vchSecret, bool fCompressed = false);
+    bool SetSecret(const CSecret& vchSecret, bool fCompressed = true);
     CSecret GetSecret(bool &fCompressed) const;
+    CSecret GetSecret() const;
     CPrivKey GetPrivKey() const;
-    bool SetPubKey(const CPubKey& vchPubKey);
     CPubKey GetPubKey() const;
+    bool WritePEM(BIO *streamObj, const SecureString &strPassKey) const;
 
     bool Sign(uint256 hash, std::vector<unsigned char>& vchSig);
 
@@ -146,24 +257,180 @@ public:
     //                  0x1D = second key with even y, 0x1E = second key with odd y
     bool SignCompact(uint256 hash, std::vector<unsigned char>& vchSig);
 
-    // reconstruct public key from a compact signature
-    // This is only slightly more CPU intensive than just verifying it.
-    // If this function succeeds, the recovered public key is guaranteed to be valid
-    // (the signature is a valid signature of the given data for that key)
-    bool SetCompactSignature(uint256 hash, const std::vector<unsigned char>& vchSig);
-
-    bool Verify(uint256 hash, const std::vector<unsigned char>& vchSig);
-
-    // Verify a compact signature
-    bool VerifyCompact(uint256 hash, const 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);
 
-    // Reserialize to DER
-    static bool ReserealizeSignature(std::vector<unsigned char>& vchSig);
+    // 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)
+    {
+        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) { }
+
+    IMPLEMENT_SERIALIZE(
+        READWRITE(pubKeyL);
+        READWRITE(pubKeyH);
+    )
+
+    bool IsValid() const {
+        return pubKeyL.IsValid() && pubKeyH.IsValid();
+    }
+
+    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;
+    }
+
+    std::string ToString() const;
+    bool SetString(const std::string& strMalleablePubKey);
+
+    CKeyID GetID() const {
+        return pubKeyL.GetID();
+    }
+
+    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