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experimental-genesis    1 //  /****************************\
experimental-genesis    2 // *      EXPERIMENTAL BRANCH.    *
experimental-genesis    3 // *    FOR LABORATORY USE ONLY.  *
experimental-genesis    4 // ********************************
experimental-genesis    5 //           ************
experimental-genesis    6 //          **************
experimental-genesis    7 //         ****************
experimental-genesis    8 //        ****   ****   ****
experimental-genesis    9 //        ***     ***    ***
experimental-genesis   10 //        ***     ***    ***
experimental-genesis   11 //         ***    * *    **
experimental-genesis   12 //         ******** ********
experimental-genesis   13 //         *******   ******
experimental-genesis   14 //             ***   **
experimental-genesis   15 //           *  ******* **
experimental-genesis   16 //           ** * * * * *
experimental-genesis   17 //     **     *         *     ***
experimental-genesis   18 //    ****    * *     * *    ****
experimental-genesis   19 //    ****    *** * * **     ***
experimental-genesis   20 //     ****    *********   ******
experimental-genesis   21 //    *******    *****    *******
experimental-genesis   22 //    *********        ****** **
experimental-genesis   23 //     **   ******   ******
experimental-genesis   24 //            **  *******       **
experimental-genesis   25 //    **       *******         ***
experimental-genesis   26 //   ****   ********  ************
experimental-genesis   27 //   ************    ************
experimental-genesis   28 //    ********             *******
experimental-genesis   29 //   ******                   ****
experimental-genesis   30 //    ***                      ***
experimental-genesis   31 // ********************************
experimental-genesis   32 // Copyright (c) 2009-2010 Satoshi Nakamoto
experimental-genesis   33 // Copyright (c) 2009-2012 The Bitcoin developers
experimental-genesis   34 // Distributed under the MIT/X11 software license, see the accompanying
experimental-genesis   35 // file license.txt or http://www.opensource.org/licenses/mit-license.php.
experimental-genesis   36 #ifndef BITCOIN_KEY_H
experimental-genesis   37 #define BITCOIN_KEY_H
experimental-genesis   38 
experimental-genesis   39 #include <stdexcept>
experimental-genesis   40 #include <vector>
experimental-genesis   41 
experimental-genesis   42 #include <openssl/ec.h>
experimental-genesis   43 #include <openssl/ecdsa.h>
experimental-genesis   44 #include <openssl/obj_mac.h>
experimental-genesis   45 
experimental-genesis   46 #include "serialize.h"
experimental-genesis   47 #include "uint256.h"
experimental-genesis   48 #include "base58.h"
experimental-genesis   49 
experimental-genesis   50 // secp160k1
experimental-genesis   51 // const unsigned int PRIVATE_KEY_SIZE = 192;
experimental-genesis   52 // const unsigned int PUBLIC_KEY_SIZE  = 41;
experimental-genesis   53 // const unsigned int SIGNATURE_SIZE   = 48;
experimental-genesis   54 //
experimental-genesis   55 // secp192k1
experimental-genesis   56 // const unsigned int PRIVATE_KEY_SIZE = 222;
experimental-genesis   57 // const unsigned int PUBLIC_KEY_SIZE  = 49;
experimental-genesis   58 // const unsigned int SIGNATURE_SIZE   = 57;
experimental-genesis   59 //
experimental-genesis   60 // secp224k1
experimental-genesis   61 // const unsigned int PRIVATE_KEY_SIZE = 250;
experimental-genesis   62 // const unsigned int PUBLIC_KEY_SIZE  = 57;
experimental-genesis   63 // const unsigned int SIGNATURE_SIZE   = 66;
experimental-genesis   64 //
experimental-genesis   65 // secp256k1:
experimental-genesis   66 // const unsigned int PRIVATE_KEY_SIZE = 279;
experimental-genesis   67 // const unsigned int PUBLIC_KEY_SIZE  = 65;
experimental-genesis   68 // const unsigned int SIGNATURE_SIZE   = 72;
experimental-genesis   69 //
experimental-genesis   70 // see www.keylength.com
experimental-genesis   71 // script supports up to 75 for single byte push
experimental-genesis   72 
experimental-genesis   73 // Generate a private key from just the secret parameter
experimental-genesis   74 int static inline EC_KEY_regenerate_key(EC_KEY *eckey, BIGNUM *priv_key)
experimental-genesis   75 {
experimental-genesis   76     int ok = 0;
experimental-genesis   77     BN_CTX *ctx = NULL;
experimental-genesis   78     EC_POINT *pub_key = NULL;
experimental-genesis   79 
experimental-genesis   80     if (!eckey) return 0;
experimental-genesis   81 
experimental-genesis   82     const EC_GROUP *group = EC_KEY_get0_group(eckey);
experimental-genesis   83 
experimental-genesis   84     if ((ctx = BN_CTX_new()) == NULL)
experimental-genesis   85         goto err;
experimental-genesis   86 
experimental-genesis   87     pub_key = EC_POINT_new(group);
experimental-genesis   88 
experimental-genesis   89     if (pub_key == NULL)
experimental-genesis   90         goto err;
experimental-genesis   91 
experimental-genesis   92     if (!EC_POINT_mul(group, pub_key, priv_key, NULL, NULL, ctx))
experimental-genesis   93         goto err;
experimental-genesis   94 
experimental-genesis   95     EC_KEY_set_private_key(eckey,priv_key);
experimental-genesis   96     EC_KEY_set_public_key(eckey,pub_key);
experimental-genesis   97 
experimental-genesis   98     ok = 1;
experimental-genesis   99 
experimental-genesis  100 err:
experimental-genesis  101 
experimental-genesis  102     if (pub_key)
experimental-genesis  103         EC_POINT_free(pub_key);
experimental-genesis  104     if (ctx != NULL)
experimental-genesis  105         BN_CTX_free(ctx);
experimental-genesis  106 
experimental-genesis  107     return(ok);
experimental-genesis  108 }
experimental-genesis  109 
experimental-genesis  110 // Perform ECDSA key recovery (see SEC1 4.1.6) for curves over (mod p)-fields
experimental-genesis  111 // recid selects which key is recovered
experimental-genesis  112 // if check is nonzero, additional checks are performed
experimental-genesis  113 int static inline ECDSA_SIG_recover_key_GFp(EC_KEY *eckey, ECDSA_SIG *ecsig, const unsigned char *msg, int msglen, int recid, int check)
experimental-genesis  114 {
experimental-genesis  115     if (!eckey) return 0;
experimental-genesis  116 
experimental-genesis  117     int ret = 0;
experimental-genesis  118     BN_CTX *ctx = NULL;
experimental-genesis  119 
experimental-genesis  120     BIGNUM *x = NULL;
experimental-genesis  121     BIGNUM *e = NULL;
experimental-genesis  122     BIGNUM *order = NULL;
experimental-genesis  123     BIGNUM *sor = NULL;
experimental-genesis  124     BIGNUM *eor = NULL;
experimental-genesis  125     BIGNUM *field = NULL;
experimental-genesis  126     EC_POINT *R = NULL;
experimental-genesis  127     EC_POINT *O = NULL;
experimental-genesis  128     EC_POINT *Q = NULL;
experimental-genesis  129     BIGNUM *rr = NULL;
experimental-genesis  130     BIGNUM *zero = NULL;
experimental-genesis  131     int n = 0;
experimental-genesis  132     int i = recid / 2;
experimental-genesis  133 
experimental-genesis  134     const EC_GROUP *group = EC_KEY_get0_group(eckey);
experimental-genesis  135     if ((ctx = BN_CTX_new()) == NULL) { ret = -1; goto err; }
experimental-genesis  136     BN_CTX_start(ctx);
experimental-genesis  137     order = BN_CTX_get(ctx);
experimental-genesis  138     if (!EC_GROUP_get_order(group, order, ctx)) { ret = -2; goto err; }
experimental-genesis  139     x = BN_CTX_get(ctx);
experimental-genesis  140     if (!BN_copy(x, order)) { ret=-1; goto err; }
experimental-genesis  141     if (!BN_mul_word(x, i)) { ret=-1; goto err; }
experimental-genesis  142     if (!BN_add(x, x, ecsig->r)) { ret=-1; goto err; }
experimental-genesis  143     field = BN_CTX_get(ctx);
experimental-genesis  144     if (!EC_GROUP_get_curve_GFp(group, field, NULL, NULL, ctx)) { ret=-2; goto err; }
experimental-genesis  145     if (BN_cmp(x, field) >= 0) { ret=0; goto err; }
experimental-genesis  146     if ((R = EC_POINT_new(group)) == NULL) { ret = -2; goto err; }
experimental-genesis  147     if (!EC_POINT_set_compressed_coordinates_GFp(group, R, x, recid % 2, ctx)) { ret=0; goto err; }
experimental-genesis  148     if (check)
experimental-genesis  149     {
experimental-genesis  150         if ((O = EC_POINT_new(group)) == NULL) { ret = -2; goto err; }
experimental-genesis  151         if (!EC_POINT_mul(group, O, NULL, R, order, ctx)) { ret=-2; goto err; }
experimental-genesis  152         if (!EC_POINT_is_at_infinity(group, O)) { ret = 0; goto err; }
experimental-genesis  153     }
experimental-genesis  154     if ((Q = EC_POINT_new(group)) == NULL) { ret = -2; goto err; }
experimental-genesis  155     n = EC_GROUP_get_degree(group);
experimental-genesis  156     e = BN_CTX_get(ctx);
experimental-genesis  157     if (!BN_bin2bn(msg, msglen, e)) { ret=-1; goto err; }
experimental-genesis  158     if (8*msglen > n) BN_rshift(e, e, 8-(n & 7));
experimental-genesis  159     zero = BN_CTX_get(ctx);
experimental-genesis  160     if (!BN_zero(zero)) { ret=-1; goto err; }
experimental-genesis  161     if (!BN_mod_sub(e, zero, e, order, ctx)) { ret=-1; goto err; }
experimental-genesis  162     rr = BN_CTX_get(ctx);
experimental-genesis  163     if (!BN_mod_inverse(rr, ecsig->r, order, ctx)) { ret=-1; goto err; }
experimental-genesis  164     sor = BN_CTX_get(ctx);
experimental-genesis  165     if (!BN_mod_mul(sor, ecsig->s, rr, order, ctx)) { ret=-1; goto err; }
experimental-genesis  166     eor = BN_CTX_get(ctx);
experimental-genesis  167     if (!BN_mod_mul(eor, e, rr, order, ctx)) { ret=-1; goto err; }
experimental-genesis  168     if (!EC_POINT_mul(group, Q, eor, R, sor, ctx)) { ret=-2; goto err; }
experimental-genesis  169     if (!EC_KEY_set_public_key(eckey, Q)) { ret=-2; goto err; }
experimental-genesis  170 
experimental-genesis  171     ret = 1;
experimental-genesis  172 
experimental-genesis  173 err:
experimental-genesis  174     if (ctx) {
experimental-genesis  175         BN_CTX_end(ctx);
experimental-genesis  176         BN_CTX_free(ctx);
experimental-genesis  177     }
experimental-genesis  178     if (R != NULL) EC_POINT_free(R);
experimental-genesis  179     if (O != NULL) EC_POINT_free(O);
experimental-genesis  180     if (Q != NULL) EC_POINT_free(Q);
experimental-genesis  181     return ret;
experimental-genesis  182 }
experimental-genesis  183 
experimental-genesis  184 class key_error : public std::runtime_error
experimental-genesis  185 {
experimental-genesis  186 public:
experimental-genesis  187     explicit key_error(const std::string& str) : std::runtime_error(str) {}
experimental-genesis  188 };
experimental-genesis  189 
experimental-genesis  190 
experimental-genesis  191 // secure_allocator is defined in serialize.h
experimental-genesis  192 // CPrivKey is a serialized private key, with all parameters included (279 bytes)
experimental-genesis  193 typedef std::vector<unsigned char, secure_allocator<unsigned char> > CPrivKey;
experimental-genesis  194 // CSecret is a serialization of just the secret parameter (32 bytes)
experimental-genesis  195 typedef std::vector<unsigned char, secure_allocator<unsigned char> > CSecret;
experimental-genesis  196 
experimental-genesis  197 class CKey
experimental-genesis  198 {
experimental-genesis  199 protected:
experimental-genesis  200     EC_KEY* pkey;
experimental-genesis  201     bool fSet;
experimental-genesis  202 
experimental-genesis  203 public:
experimental-genesis  204     CKey()
experimental-genesis  205     {
experimental-genesis  206         pkey = EC_KEY_new_by_curve_name(NID_secp256k1);
experimental-genesis  207         if (pkey == NULL)
experimental-genesis  208             throw key_error("CKey::CKey() : EC_KEY_new_by_curve_name failed");
experimental-genesis  209         fSet = false;
experimental-genesis  210     }
experimental-genesis  211 
experimental-genesis  212     CKey(const CKey& b)
experimental-genesis  213     {
experimental-genesis  214         pkey = EC_KEY_dup(b.pkey);
experimental-genesis  215         if (pkey == NULL)
experimental-genesis  216             throw key_error("CKey::CKey(const CKey&) : EC_KEY_dup failed");
experimental-genesis  217         fSet = b.fSet;
experimental-genesis  218     }
experimental-genesis  219 
experimental-genesis  220     CKey& operator=(const CKey& b)
experimental-genesis  221     {
experimental-genesis  222         if (!EC_KEY_copy(pkey, b.pkey))
experimental-genesis  223             throw key_error("CKey::operator=(const CKey&) : EC_KEY_copy failed");
experimental-genesis  224         fSet = b.fSet;
experimental-genesis  225         return (*this);
experimental-genesis  226     }
experimental-genesis  227 
experimental-genesis  228     ~CKey()
experimental-genesis  229     {
experimental-genesis  230         EC_KEY_free(pkey);
experimental-genesis  231     }
experimental-genesis  232 
experimental-genesis  233     bool IsNull() const
experimental-genesis  234     {
experimental-genesis  235         return !fSet;
experimental-genesis  236     }
experimental-genesis  237 
experimental-genesis  238     void MakeNewKey()
experimental-genesis  239     {
experimental-genesis  240         if (!EC_KEY_generate_key(pkey))
experimental-genesis  241             throw key_error("CKey::MakeNewKey() : EC_KEY_generate_key failed");
experimental-genesis  242         fSet = true;
experimental-genesis  243     }
experimental-genesis  244 
experimental-genesis  245     bool SetPrivKey(const CPrivKey& vchPrivKey)
experimental-genesis  246     {
experimental-genesis  247         const unsigned char* pbegin = &vchPrivKey[0];
experimental-genesis  248         if (!d2i_ECPrivateKey(&pkey, &pbegin, vchPrivKey.size()))
experimental-genesis  249             return false;
experimental-genesis  250         fSet = true;
experimental-genesis  251         return true;
experimental-genesis  252     }
experimental-genesis  253 
experimental-genesis  254     bool SetSecret(const CSecret& vchSecret)
experimental-genesis  255     {
experimental-genesis  256         EC_KEY_free(pkey);
experimental-genesis  257         pkey = EC_KEY_new_by_curve_name(NID_secp256k1);
experimental-genesis  258         if (pkey == NULL)
experimental-genesis  259             throw key_error("CKey::SetSecret() : EC_KEY_new_by_curve_name failed");
experimental-genesis  260         if (vchSecret.size() != 32)
experimental-genesis  261             throw key_error("CKey::SetSecret() : secret must be 32 bytes");
experimental-genesis  262         BIGNUM *bn = BN_bin2bn(&vchSecret[0],32,BN_new());
experimental-genesis  263         if (bn == NULL)
experimental-genesis  264             throw key_error("CKey::SetSecret() : BN_bin2bn failed");
experimental-genesis  265         if (!EC_KEY_regenerate_key(pkey,bn))
experimental-genesis  266         {
experimental-genesis  267             BN_clear_free(bn);
experimental-genesis  268             throw key_error("CKey::SetSecret() : EC_KEY_regenerate_key failed");
experimental-genesis  269         }
experimental-genesis  270         BN_clear_free(bn);
experimental-genesis  271         fSet = true;
experimental-genesis  272         return true;
experimental-genesis  273     }
experimental-genesis  274 
experimental-genesis  275     CSecret GetSecret() const
experimental-genesis  276     {
experimental-genesis  277         CSecret vchRet;
experimental-genesis  278         vchRet.resize(32);
experimental-genesis  279         const BIGNUM *bn = EC_KEY_get0_private_key(pkey);
experimental-genesis  280         int nBytes = BN_num_bytes(bn);
experimental-genesis  281         if (bn == NULL)
experimental-genesis  282             throw key_error("CKey::GetSecret() : EC_KEY_get0_private_key failed");
experimental-genesis  283         int n=BN_bn2bin(bn,&vchRet[32 - nBytes]);
experimental-genesis  284         if (n != nBytes) 
experimental-genesis  285             throw key_error("CKey::GetSecret(): BN_bn2bin failed");
experimental-genesis  286         return vchRet;
experimental-genesis  287     }
experimental-genesis  288 
experimental-genesis  289     CPrivKey GetPrivKey() const
experimental-genesis  290     {
experimental-genesis  291         unsigned int nSize = i2d_ECPrivateKey(pkey, NULL);
experimental-genesis  292         if (!nSize)
experimental-genesis  293             throw key_error("CKey::GetPrivKey() : i2d_ECPrivateKey failed");
experimental-genesis  294         CPrivKey vchPrivKey(nSize, 0);
experimental-genesis  295         unsigned char* pbegin = &vchPrivKey[0];
experimental-genesis  296         if (i2d_ECPrivateKey(pkey, &pbegin) != nSize)
experimental-genesis  297             throw key_error("CKey::GetPrivKey() : i2d_ECPrivateKey returned unexpected size");
experimental-genesis  298         return vchPrivKey;
experimental-genesis  299     }
experimental-genesis  300 
experimental-genesis  301     bool SetPubKey(const std::vector<unsigned char>& vchPubKey)
experimental-genesis  302     {
experimental-genesis  303         const unsigned char* pbegin = &vchPubKey[0];
experimental-genesis  304         if (!o2i_ECPublicKey(&pkey, &pbegin, vchPubKey.size()))
experimental-genesis  305             return false;
experimental-genesis  306         fSet = true;
experimental-genesis  307         return true;
experimental-genesis  308     }
experimental-genesis  309 
experimental-genesis  310     std::vector<unsigned char> GetPubKey() const
experimental-genesis  311     {
experimental-genesis  312         unsigned int nSize = i2o_ECPublicKey(pkey, NULL);
experimental-genesis  313         if (!nSize)
experimental-genesis  314             throw key_error("CKey::GetPubKey() : i2o_ECPublicKey failed");
experimental-genesis  315         std::vector<unsigned char> vchPubKey(nSize, 0);
experimental-genesis  316         unsigned char* pbegin = &vchPubKey[0];
experimental-genesis  317         if (i2o_ECPublicKey(pkey, &pbegin) != nSize)
experimental-genesis  318             throw key_error("CKey::GetPubKey() : i2o_ECPublicKey returned unexpected size");
experimental-genesis  319         return vchPubKey;
experimental-genesis  320     }
experimental-genesis  321 
experimental-genesis  322     bool Sign(uint256 hash, std::vector<unsigned char>& vchSig)
experimental-genesis  323     {
experimental-genesis  324         vchSig.clear();
experimental-genesis  325         unsigned char pchSig[10000];
experimental-genesis  326         unsigned int nSize = 0;
experimental-genesis  327         if (!ECDSA_sign(0, (unsigned char*)&hash, sizeof(hash), pchSig, &nSize, pkey))
experimental-genesis  328             return false;
experimental-genesis  329         vchSig.resize(nSize);
experimental-genesis  330         memcpy(&vchSig[0], pchSig, nSize);
experimental-genesis  331         return true;
experimental-genesis  332     }
experimental-genesis  333 
experimental-genesis  334     // create a compact signature (65 bytes), which allows reconstructing the used public key
experimental-genesis  335     // The format is one header byte, followed by two times 32 bytes for the serialized r and s values.
experimental-genesis  336     // The header byte: 0x1B = first key with even y, 0x1C = first key with odd y,
experimental-genesis  337     //                  0x1D = second key with even y, 0x1E = second key with odd y
experimental-genesis  338     bool SignCompact(uint256 hash, std::vector<unsigned char>& vchSig)
experimental-genesis  339     {
experimental-genesis  340         bool fOk = false;
experimental-genesis  341         ECDSA_SIG *sig = ECDSA_do_sign((unsigned char*)&hash, sizeof(hash), pkey);
experimental-genesis  342         if (sig==NULL)
experimental-genesis  343             return false;
experimental-genesis  344         vchSig.clear();
experimental-genesis  345         vchSig.resize(65,0);
experimental-genesis  346         int nBitsR = BN_num_bits(sig->r);
experimental-genesis  347         int nBitsS = BN_num_bits(sig->s);
experimental-genesis  348         if (nBitsR <= 256 && nBitsS <= 256)
experimental-genesis  349         {
experimental-genesis  350             int nRecId = -1;
experimental-genesis  351             for (int i=0; i<4; i++)
experimental-genesis  352             {
experimental-genesis  353                 CKey keyRec;
experimental-genesis  354                 keyRec.fSet = true;
experimental-genesis  355                 if (ECDSA_SIG_recover_key_GFp(keyRec.pkey, sig, (unsigned char*)&hash, sizeof(hash), i, 1) == 1)
experimental-genesis  356                     if (keyRec.GetPubKey() == this->GetPubKey())
experimental-genesis  357                     {
experimental-genesis  358                         nRecId = i;
experimental-genesis  359                         break;
experimental-genesis  360                     }
experimental-genesis  361             }
experimental-genesis  362 
experimental-genesis  363             if (nRecId == -1)
experimental-genesis  364                 throw key_error("CKey::SignCompact() : unable to construct recoverable key");
experimental-genesis  365 
experimental-genesis  366             vchSig[0] = nRecId+27;
experimental-genesis  367             BN_bn2bin(sig->r,&vchSig[33-(nBitsR+7)/8]);
experimental-genesis  368             BN_bn2bin(sig->s,&vchSig[65-(nBitsS+7)/8]);
experimental-genesis  369             fOk = true;
experimental-genesis  370         }
experimental-genesis  371         ECDSA_SIG_free(sig);
experimental-genesis  372         return fOk;
experimental-genesis  373     }
experimental-genesis  374 
experimental-genesis  375     // reconstruct public key from a compact signature
experimental-genesis  376     // This is only slightly more CPU intensive than just verifying it.
experimental-genesis  377     // If this function succeeds, the recovered public key is guaranteed to be valid
experimental-genesis  378     // (the signature is a valid signature of the given data for that key)
experimental-genesis  379     bool SetCompactSignature(uint256 hash, const std::vector<unsigned char>& vchSig)
experimental-genesis  380     {
experimental-genesis  381         if (vchSig.size() != 65)
experimental-genesis  382             return false;
experimental-genesis  383         if (vchSig[0]<27 || vchSig[0]>=31)
experimental-genesis  384             return false;
experimental-genesis  385         ECDSA_SIG *sig = ECDSA_SIG_new();
experimental-genesis  386         BN_bin2bn(&vchSig[1],32,sig->r);
experimental-genesis  387         BN_bin2bn(&vchSig[33],32,sig->s);
experimental-genesis  388 
experimental-genesis  389         EC_KEY_free(pkey);
experimental-genesis  390         pkey = EC_KEY_new_by_curve_name(NID_secp256k1);
experimental-genesis  391         if (ECDSA_SIG_recover_key_GFp(pkey, sig, (unsigned char*)&hash, sizeof(hash), vchSig[0] - 27, 0) == 1)
experimental-genesis  392         {
experimental-genesis  393             fSet = true;
experimental-genesis  394             ECDSA_SIG_free(sig);
experimental-genesis  395             return true;
experimental-genesis  396         }
experimental-genesis  397         return false;
experimental-genesis  398     }
experimental-genesis  399 
experimental-genesis  400     bool Verify(uint256 hash, const std::vector<unsigned char>& vchSig)
experimental-genesis  401     {
experimental-genesis  402         // -1 = error, 0 = bad sig, 1 = good
experimental-genesis  403         if (ECDSA_verify(0, (unsigned char*)&hash, sizeof(hash), &vchSig[0], vchSig.size(), pkey) != 1)
experimental-genesis  404             return false;
experimental-genesis  405         return true;
experimental-genesis  406     }
experimental-genesis  407 
experimental-genesis  408     // Verify a compact signature
experimental-genesis  409     bool VerifyCompact(uint256 hash, const std::vector<unsigned char>& vchSig)
experimental-genesis  410     {
experimental-genesis  411         CKey key;
experimental-genesis  412         if (!key.SetCompactSignature(hash, vchSig))
experimental-genesis  413             return false;
experimental-genesis  414         if (GetPubKey() != key.GetPubKey())
experimental-genesis  415             return false;
experimental-genesis  416         return true;
experimental-genesis  417     }
experimental-genesis  418 
experimental-genesis  419     // Get the address corresponding to this key
experimental-genesis  420     CBitcoinAddress GetAddress() const
experimental-genesis  421     {
experimental-genesis  422         return CBitcoinAddress(GetPubKey());
experimental-genesis  423     }
experimental-genesis  424 
experimental-genesis  425     bool IsValid()
experimental-genesis  426     {
experimental-genesis  427         if (!fSet)
experimental-genesis  428             return false;
experimental-genesis  429 
experimental-genesis  430         CSecret secret = GetSecret();
experimental-genesis  431         CKey key2;
experimental-genesis  432         key2.SetSecret(secret);
experimental-genesis  433         return GetPubKey() == key2.GetPubKey();
experimental-genesis  434     }
experimental-genesis  435 };
experimental-genesis  436 
experimental-genesis  437 #endif