1 // Copyright (c) 2009-2010 Satoshi Nakamoto
2 // Copyright (c) 2009-2012 The Bitcoin developers
3 // Distributed under the MIT/X11 software license, see the accompanying
4 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
11 #include "allocators.h"
12 #include "serialize.h"
16 #include <openssl/ec.h> // for EC_KEY definition
17 #include <openssl/obj_mac.h>
21 // const unsigned int PRIVATE_KEY_SIZE = 192;
22 // const unsigned int PUBLIC_KEY_SIZE = 41;
23 // const unsigned int SIGNATURE_SIZE = 48;
26 // const unsigned int PRIVATE_KEY_SIZE = 222;
27 // const unsigned int PUBLIC_KEY_SIZE = 49;
28 // const unsigned int SIGNATURE_SIZE = 57;
31 // const unsigned int PRIVATE_KEY_SIZE = 250;
32 // const unsigned int PUBLIC_KEY_SIZE = 57;
33 // const unsigned int SIGNATURE_SIZE = 66;
36 // const unsigned int PRIVATE_KEY_SIZE = 279;
37 // const unsigned int PUBLIC_KEY_SIZE = 65;
38 // const unsigned int SIGNATURE_SIZE = 72;
40 // see www.keylength.com
41 // script supports up to 75 for single byte push
43 class key_error : public std::runtime_error
46 explicit key_error(const std::string& str) : std::runtime_error(str) {}
49 /** A reference to a CKey: the Hash160 of its serialized public key */
50 class CKeyID : public uint160
54 CKeyID(const uint160 &in);
57 /** A reference to a CScript: the Hash160 of its serialization (see script.h) */
58 class CScriptID : public uint160
62 CScriptID(const uint160 &in);
65 /** An encapsulated OpenSSL Elliptic Curve key (public) */
71 * Just store the serialized data.
72 * Its length can very cheaply be computed from the first byte.
74 unsigned char vbytes[65];
76 //! Compute the length of a pubkey with a given first byte.
77 unsigned int static GetLen(unsigned char chHeader)
79 if (chHeader == 2 || chHeader == 3)
81 if (chHeader == 4 || chHeader == 6 || chHeader == 7)
86 // Set this key data to be invalid
93 // Construct an invalid public key.
99 // Initialize a public key using begin/end iterators to byte data.
100 template <typename T>
101 void Set(const T pbegin, const T pend)
103 int len = pend == pbegin ? 0 : GetLen(pbegin[0]);
104 if (len && len == (pend - pbegin))
105 memcpy(vbytes, (unsigned char*)&pbegin[0], len);
110 void Set(const std::vector<unsigned char>& vch)
112 Set(vch.begin(), vch.end());
115 template <typename T>
116 CPubKey(const T pbegin, const T pend)
121 CPubKey(const std::vector<unsigned char>& vch)
123 Set(vch.begin(), vch.end());
126 // Read-only vector-like interface to the data.
127 unsigned int size() const { return GetLen(vbytes[0]); }
128 const unsigned char* begin() const { return vbytes; }
129 const unsigned char* end() const { return vbytes + size(); }
130 const unsigned char& operator[](unsigned int pos) const { return vbytes[pos]; }
132 friend bool operator==(const CPubKey& a, const CPubKey& b) { return a.vbytes[0] == b.vbytes[0] && memcmp(a.vbytes, b.vbytes, a.size()) == 0; }
133 friend bool operator!=(const CPubKey& a, const CPubKey& b) { return !(a == b); }
134 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); }
136 //! Implement serialization, as if this was a byte vector.
137 unsigned int GetSerializeSize(int nType, int nVersion) const
141 template <typename Stream>
142 void Serialize(Stream& s, int nType, int nVersion) const
144 unsigned int len = size();
145 ::WriteCompactSize(s, len);
146 s.write((char*)vbytes, len);
148 template <typename Stream>
149 void Unserialize(Stream& s, int nType, int nVersion)
151 unsigned int len = ::ReadCompactSize(s);
153 s.read((char*)vbytes, len);
155 // invalid pubkey, skip available data
163 CKeyID GetID() const;
164 uint256 GetHash() const;
167 * Check syntactic correctness.
169 * Note that this is consensus critical as CheckSig() calls it!
176 //! fully validate whether this is a valid public key (more expensive than IsValid())
177 bool IsFullyValid() const
179 const unsigned char* pbegin = &vbytes[0];
180 EC_KEY *pkey = EC_KEY_new_by_curve_name(NID_secp256k1);
181 if (o2i_ECPublicKey(&pkey, &pbegin, size()))
189 //! Check whether this is a compressed public key.
190 bool IsCompressed() const
195 bool Verify(const uint256& hash, const std::vector<unsigned char>& vchSig) const;
196 bool VerifyCompact(uint256 hash, const std::vector<unsigned char>& vchSig);
198 bool SetCompactSignature(uint256 hash, const std::vector<unsigned char>& vchSig);
200 // Reserialize to DER
201 static bool ReserealizeSignature(std::vector<unsigned char>& vchSig);
204 // secure_allocator is defined in allocators.h
205 // CPrivKey is a serialized private key, with all parameters included (279 bytes)
206 typedef std::vector<unsigned char, secure_allocator<unsigned char> > CPrivKey;
207 // CSecret is a serialization of just the secret parameter (32 bytes)
208 typedef std::vector<unsigned char, secure_allocator<unsigned char> > CSecret;
210 /** An encapsulated OpenSSL Elliptic Curve key (private) */
223 CKey(const CSecret& b, bool fCompressed=true);
225 CKey& operator=(const CKey& b);
230 bool IsCompressed() const;
232 void SetCompressedPubKey(bool fCompressed=true);
233 void MakeNewKey(bool fCompressed=true);
234 bool SetPrivKey(const CPrivKey& vchPrivKey);
235 bool SetSecret(const CSecret& vchSecret, bool fCompressed = true);
236 CSecret GetSecret(bool &fCompressed) const;
237 CSecret GetSecret() const;
238 CPrivKey GetPrivKey() const;
239 CPubKey GetPubKey() const;
241 bool Sign(uint256 hash, std::vector<unsigned char>& vchSig);
243 // create a compact signature (65 bytes), which allows reconstructing the used public key
244 // The format is one header byte, followed by two times 32 bytes for the serialized r and s values.
245 // The header byte: 0x1B = first key with even y, 0x1C = first key with odd y,
246 // 0x1D = second key with even y, 0x1E = second key with odd y
247 bool SignCompact(uint256 hash, std::vector<unsigned char>& vchSig);
251 // Check whether an element of a signature (r or s) is valid.
252 static bool CheckSignatureElement(const unsigned char *vch, int len, bool half);
264 bool operator!=(const CPoint &a);
267 // Initialize from octets stream
268 bool setBytes(const std::vector<unsigned char> &vchBytes);
270 // Initialize from pubkey
271 bool setPubKey(const CPubKey &vchPubKey);
273 // Serialize to octets stream
274 bool getBytes(std::vector<unsigned char> &vchBytes);
276 // ECC multiplication by specified multiplier
277 bool ECMUL(const CBigNum &bnMultiplier);
280 bool ECMULGEN(const CBigNum &bnMultiplier, const CPoint &qPoint);
282 bool IsInfinity() { return EC_POINT_is_at_infinity(group, point) != 0; }
285 class CMalleablePubKey
290 friend class CMalleableKey;
292 static const unsigned char CURRENT_VERSION = 1;
295 CMalleablePubKey() { }
296 CMalleablePubKey(const CMalleablePubKey& mpk)
298 pubKeyL = mpk.pubKeyL;
299 pubKeyH = mpk.pubKeyH;
301 CMalleablePubKey(const std::vector<unsigned char> &vchPubKeyPair) { setvch(vchPubKeyPair); }
302 CMalleablePubKey(const std::string& strMalleablePubKey) { SetString(strMalleablePubKey); }
303 CMalleablePubKey(const CPubKey &pubKeyInL, const CPubKey &pubKeyInH) : pubKeyL(pubKeyInL), pubKeyH(pubKeyInH) { }
310 bool IsValid() const {
311 return pubKeyL.IsValid() && pubKeyH.IsValid();
314 bool operator==(const CMalleablePubKey &b);
315 bool operator!=(const CMalleablePubKey &b) { return !(*this == b); }
316 CMalleablePubKey& operator=(const CMalleablePubKey& mpk) {
317 pubKeyL = mpk.pubKeyL;
318 pubKeyH = mpk.pubKeyH;
322 std::string ToString() const;
323 bool SetString(const std::string& strMalleablePubKey);
325 CKeyID GetID() const {
326 return pubKeyL.GetID();
329 bool setvch(const std::vector<unsigned char> &vchPubKeyPair);
330 std::vector<unsigned char> Raw() const;
332 CPubKey& GetL() { return pubKeyL; }
333 CPubKey& GetH() { return pubKeyH; }
334 void GetVariant(CPubKey &R, CPubKey &vchPubKeyVariant);
343 friend class CMalleableKeyView;
347 CMalleableKey(const CMalleableKey &b);
348 CMalleableKey(const CSecret &L, const CSecret &H);
352 READWRITE(vchSecretL);
353 READWRITE(vchSecretH);
356 std::string ToString() const;
357 bool SetString(const std::string& strMalleablePubKey);
358 std::vector<unsigned char> Raw() const;
359 CMalleableKey& operator=(const CMalleableKey& mk) {
360 vchSecretL = mk.vchSecretL;
361 vchSecretH = mk.vchSecretH;
368 bool IsValid() const { return !IsNull() && GetMalleablePubKey().IsValid(); }
369 bool SetSecrets(const CSecret &pvchSecretL, const CSecret &pvchSecretH);
371 CSecret GetSecretL() const { return vchSecretL; }
372 CSecret GetSecretH() const { return vchSecretH; }
374 CKeyID GetID() const {
375 return GetMalleablePubKey().GetID();
377 CMalleablePubKey GetMalleablePubKey() const;
378 bool CheckKeyVariant(const CPubKey &R, const CPubKey &vchPubKeyVariant) const;
379 bool CheckKeyVariant(const CPubKey &R, const CPubKey &vchPubKeyVariant, CKey &privKeyVariant) const;
382 class CMalleableKeyView
389 CMalleableKeyView() { };
390 CMalleableKeyView(const CMalleableKey &b);
391 CMalleableKeyView(const std::string &strMalleableKey);
393 CMalleableKeyView(const CMalleableKeyView &b);
394 CMalleableKeyView& operator=(const CMalleableKey &b);
395 ~CMalleableKeyView();
398 READWRITE(vchSecretL);
399 READWRITE(vchPubKeyH);
402 bool IsValid() const;
403 std::string ToString() const;
404 bool SetString(const std::string& strMalleablePubKey);
405 std::vector<unsigned char> Raw() const;
406 CMalleableKeyView& operator=(const CMalleableKeyView& mkv) {
407 vchSecretL = mkv.vchSecretL;
408 vchPubKeyH = mkv.vchPubKeyH;
412 CKeyID GetID() const {
413 return GetMalleablePubKey().GetID();
415 CMalleablePubKey GetMalleablePubKey() const;
416 CMalleableKey GetMalleableKey(const CSecret &vchSecretH) const { return CMalleableKey(vchSecretL, vchSecretH); }
417 bool CheckKeyVariant(const CPubKey &R, const CPubKey &vchPubKeyVariant) const;
419 bool operator <(const CMalleableKeyView& kv) const;