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# eccrypto.cpp

    00001 // eccrypto.cpp - written and placed in the public domain by Wei Dai
    00002
    00003 #include "pch.h"
    00004
    00005 #ifndef CRYPTOPP_IMPORTS
    00006
    00007 #include "eccrypto.h"
    00008 #include "nbtheory.h"
    00009 #include "oids.h"
    00010 #include "hex.h"
    00011 #include "argnames.h"
    00012 #include "ec2n.h"
    00013
    00014 NAMESPACE_BEGIN(CryptoPP)
    00015
    00016 #if 0
    00017 static void ECDSA_TestInstantiations()
    00018 {
    00019         ECDSA<EC2N>::Signer t1;
    00020         ECDSA<EC2N>::Verifier t2(t1);
    00021         ECNR<ECP>::Signer t3;
    00022         ECNR<ECP>::Verifier t4(t3);
    00023         ECIES<ECP>::Encryptor t5;
    00024         ECIES<EC2N>::Decryptor t6;
    00025         ECDH<ECP>::Domain t7;
    00026         ECMQV<ECP>::Domain t8;
    00027 }
    00028 #endif
    00029
    00030 // VC60 workaround: complains when these functions are put into an anonymous namespace
    00031 static Integer ConvertToInteger(const PolynomialMod2 &x)
    00032 {
    00033         unsigned int l = x.ByteCount();
    00034         SecByteBlock temp(l);
    00035         x.Encode(temp, l);
    00036         return Integer(temp, l);
    00037 }
    00038
    00039 static inline Integer ConvertToInteger(const Integer &x)
    00040 {
    00041         return x;
    00042 }
    00043
    00044 static bool CheckMOVCondition(const Integer &q, const Integer &r)
    00045 {
    00046         Integer t=1;
    00047         unsigned int n=q.BitCount(), m=r.BitCount();
    00048
    00049         for (unsigned int i=n; DiscreteLogWorkFactor(i)<m/2; i+=n)
    00050         {
    00051                 t = (t*q)%r;
    00052                 if (t == 1)
    00053                         return false;
    00054         }
    00055         return true;
    00056 }
    00057
    00058 // ******************************************************************
    00059
    00060 template <class T> struct EcRecommendedParameters;
    00061
    00062 template<> struct EcRecommendedParameters<EC2N>
    00063 {
    00064         EcRecommendedParameters(const OID &oid, unsigned int t2, unsigned int t3, unsigned int t4, const char *a, const char *b, const char *g, const char *n, unsigned int h)
    00065                 : oid(oid), t0(0), t1(0), t2(t2), t3(t3), t4(t4), a(a), b(b), g(g), n(n), h(h) {}
    00066         EcRecommendedParameters(const OID &oid, unsigned int t0, unsigned int t1, unsigned int t2, unsigned int t3, unsigned int t4, const char *a, const char *b, const char *g, const char *n, unsigned int h)
    00067                 : oid(oid), t0(t0), t1(t1), t2(t2), t3(t3), t4(t4), a(a), b(b), g(g), n(n), h(h) {}
    00068         EC2N *NewEC() const
    00069         {
    00070                 StringSource ssA(a, true, new HexDecoder);
    00071                 StringSource ssB(b, true, new HexDecoder);
    00072                 if (t0 == 0)
    00073                         return new EC2N(GF2NT(t2, t3, t4), EC2N::FieldElement(ssA, (size_t)ssA.MaxRetrievable()), EC2N::FieldElement(ssB, (size_t)ssB.MaxRetrievable()));
    00074                 else
    00075                         return new EC2N(GF2NPP(t0, t1, t2, t3, t4), EC2N::FieldElement(ssA, (size_t)ssA.MaxRetrievable()), EC2N::FieldElement(ssB, (size_t)ssB.MaxRetrievable()));
    00076         };
    00077
    00078         OID oid;
    00079         unsigned int t0, t1, t2, t3, t4;
    00080         const char *a, *b, *g, *n;
    00081         unsigned int h;
    00082 };
    00083
    00084 template<> struct EcRecommendedParameters<ECP>
    00085 {
    00086         EcRecommendedParameters(const OID &oid, const char *p, const char *a, const char *b, const char *g, const char *n, unsigned int h)
    00087                 : oid(oid), p(p), a(a), b(b), g(g), n(n), h(h) {}
    00088         ECP *NewEC() const
    00089         {
    00090                 StringSource ssP(p, true, new HexDecoder);
    00091                 StringSource ssA(a, true, new HexDecoder);
    00092                 StringSource ssB(b, true, new HexDecoder);
    00093                 return new ECP(Integer(ssP, (size_t)ssP.MaxRetrievable()), ECP::FieldElement(ssA, (size_t)ssA.MaxRetrievable()), ECP::FieldElement(ssB, (size_t)ssB.MaxRetrievable()));
    00094         };
    00095
    00096         OID oid;
    00097         const char *p;
    00098         const char *a, *b, *g, *n;
    00099         unsigned int h;
    00100 };
    00101
    00102 struct OIDLessThan
    00103 {
    00104         template <typename T>
    00105         inline bool operator()(const EcRecommendedParameters<T>& a, const OID& b) {return a.oid < b;}
    00106         template <typename T>
    00107         inline bool operator()(const OID& a, const EcRecommendedParameters<T>& b) {return a < b.oid;}
    00108         template <typename T>
    00109         inline bool operator()(const EcRecommendedParameters<T>& a, const EcRecommendedParameters<T>& b) {return a.oid < b.oid;}
    00110 };
    00111
    00112 static void GetRecommendedParameters(const EcRecommendedParameters<EC2N> *&begin, const EcRecommendedParameters<EC2N> *&end)
    00113 {
    00114         // this array must be sorted by OID
    00115         static const EcRecommendedParameters<EC2N> rec[] = {
    00116                 EcRecommendedParameters<EC2N>(ASN1::sect163k1(),
    00117                         163, 7, 6, 3, 0,
    00118                         "000000000000000000000000000000000000000001",
    00119                         "000000000000000000000000000000000000000001",
    00120                         "0402FE13C0537BBC11ACAA07D793DE4E6D5E5C94EEE80289070FB05D38FF58321F2E800536D538CCDAA3D9",
    00121                         "04000000000000000000020108A2E0CC0D99F8A5EF",
    00122                         2),
    00123                 EcRecommendedParameters<EC2N>(ASN1::sect163r1(),
    00124                         163, 7, 6, 3, 0,
    00125                         "07B6882CAAEFA84F9554FF8428BD88E246D2782AE2",
    00126                         "0713612DCDDCB40AAB946BDA29CA91F73AF958AFD9",
    00127                         "040369979697AB43897789566789567F787A7876A65400435EDB42EFAFB2989D51FEFCE3C80988F41FF883",
    00128                         "03FFFFFFFFFFFFFFFFFFFF48AAB689C29CA710279B",
    00129                         2),
    00130                 EcRecommendedParameters<EC2N>(ASN1::sect239k1(),
    00131                         239, 158, 0,
    00132                         "000000000000000000000000000000000000000000000000000000000000",
    00133                         "000000000000000000000000000000000000000000000000000000000001",
    00134                         "0429A0B6A887A983E9730988A68727A8B2D126C44CC2CC7B2A6555193035DC76310804F12E549BDB011C103089E73510ACB275FC312A5DC6B76553F0CA",
    00135                         "2000000000000000000000000000005A79FEC67CB6E91F1C1DA800E478A5",
    00136                         4),
    00137                 EcRecommendedParameters<EC2N>(ASN1::sect113r1(),
    00138                         113, 9, 0,
    00139                         "003088250CA6E7C7FE649CE85820F7",
    00140                         "00E8BEE4D3E2260744188BE0E9C723",
    00141                         "04009D73616F35F4AB1407D73562C10F00A52830277958EE84D1315ED31886",
    00142                         "0100000000000000D9CCEC8A39E56F",
    00143                         2),
    00144                 EcRecommendedParameters<EC2N>(ASN1::sect113r2(),
    00145                         113, 9, 0,
    00146                         "00689918DBEC7E5A0DD6DFC0AA55C7",
    00147                         "0095E9A9EC9B297BD4BF36E059184F",
    00148                         "0401A57A6A7B26CA5EF52FCDB816479700B3ADC94ED1FE674C06E695BABA1D",
    00149                         "010000000000000108789B2496AF93",
    00150                         2),
    00151                 EcRecommendedParameters<EC2N>(ASN1::sect163r2(),
    00152                         163, 7, 6, 3, 0,
    00153                         "000000000000000000000000000000000000000001",
    00154                         "020A601907B8C953CA1481EB10512F78744A3205FD",
    00155                         "0403F0EBA16286A2D57EA0991168D4994637E8343E3600D51FBC6C71A0094FA2CDD545B11C5C0C797324F1",
    00156                         "040000000000000000000292FE77E70C12A4234C33",
    00157                         2),
    00158                 EcRecommendedParameters<EC2N>(ASN1::sect283k1(),
    00159                         283, 12, 7, 5, 0,
    00160                         "000000000000000000000000000000000000000000000000000000000000000000000000",
    00161                         "000000000000000000000000000000000000000000000000000000000000000000000001",
    00162                         "040503213F78CA44883F1A3B8162F188E553CD265F23C1567A16876913B0C2AC245849283601CCDA380F1C9E318D90F95D07E5426FE87E45C0E8184698E45962364E34116177DD2259",
    00163                         "01FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFE9AE2ED07577265DFF7F94451E061E163C61",
    00164                         4),
    00165                 EcRecommendedParameters<EC2N>(ASN1::sect283r1(),
    00166                         283, 12, 7, 5, 0,
    00167                         "000000000000000000000000000000000000000000000000000000000000000000000001",
    00168                         "027B680AC8B8596DA5A4AF8A19A0303FCA97FD7645309FA2A581485AF6263E313B79A2F5",
    00169                         "0405F939258DB7DD90E1934F8C70B0DFEC2EED25B8557EAC9C80E2E198F8CDBECD86B1205303676854FE24141CB98FE6D4B20D02B4516FF702350EDDB0826779C813F0DF45BE8112F4",
    00170                         "03FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEF90399660FC938A90165B042A7CEFADB307",
    00171                         2),
    00172                 EcRecommendedParameters<EC2N>(ASN1::sect131r1(),
    00173                         131, 8, 3, 2, 0,
    00174                         "07A11B09A76B562144418FF3FF8C2570B8",
    00175                         "0217C05610884B63B9C6C7291678F9D341",
    00176                         "040081BAF91FDF9833C40F9C181343638399078C6E7EA38C001F73C8134B1B4EF9E150",
    00177                         "0400000000000000023123953A9464B54D",
    00178                         2),
    00179                 EcRecommendedParameters<EC2N>(ASN1::sect131r2(),
    00180                         131, 8, 3, 2, 0,
    00181                         "03E5A88919D7CAFCBF415F07C2176573B2",
    00182                         "04B8266A46C55657AC734CE38F018F2192",
    00183                         "040356DCD8F2F95031AD652D23951BB366A80648F06D867940A5366D9E265DE9EB240F",
    00184                         "0400000000000000016954A233049BA98F",
    00185                         2),
    00186                 EcRecommendedParameters<EC2N>(ASN1::sect193r1(),
    00187                         193, 15, 0,
    00188                         "0017858FEB7A98975169E171F77B4087DE098AC8A911DF7B01",
    00189                         "00FDFB49BFE6C3A89FACADAA7A1E5BBC7CC1C2E5D831478814",
    00190                         "0401F481BC5F0FF84A74AD6CDF6FDEF4BF6179625372D8C0C5E10025E399F2903712CCF3EA9E3A1AD17FB0B3201B6AF7CE1B05",
    00191                         "01000000000000000000000000C7F34A778F443ACC920EBA49",
    00192                         2),
    00193                 EcRecommendedParameters<EC2N>(ASN1::sect193r2(),
    00194                         193, 15, 0,
    00195                         "0163F35A5137C2CE3EA6ED8667190B0BC43ECD69977702709B",
    00196                         "00C9BB9E8927D4D64C377E2AB2856A5B16E3EFB7F61D4316AE",
    00197                         "0400D9B67D192E0367C803F39E1A7E82CA14A651350AAE617E8F01CE94335607C304AC29E7DEFBD9CA01F596F927224CDECF6C",
    00198                         "010000000000000000000000015AAB561B005413CCD4EE99D5",
    00199                         2),
    00200                 EcRecommendedParameters<EC2N>(ASN1::sect233k1(),
    00201                         233, 74, 0,
    00202                         "000000000000000000000000000000000000000000000000000000000000",
    00203                         "000000000000000000000000000000000000000000000000000000000001",
    00204                         "04017232BA853A7E731AF129F22FF4149563A419C26BF50A4C9D6EEFAD612601DB537DECE819B7F70F555A67C427A8CD9BF18AEB9B56E0C11056FAE6A3",
    00205                         "8000000000000000000000000000069D5BB915BCD46EFB1AD5F173ABDF",
    00206                         4),
    00207                 EcRecommendedParameters<EC2N>(ASN1::sect233r1(),
    00208                         233, 74, 0,
    00209                         "000000000000000000000000000000000000000000000000000000000001",
    00210                         "0066647EDE6C332C7F8C0923BB58213B333B20E9CE4281FE115F7D8F90AD",
    00211                         "0400FAC9DFCBAC8313BB2139F1BB755FEF65BC391F8B36F8F8EB7371FD558B01006A08A41903350678E58528BEBF8A0BEFF867A7CA36716F7E01F81052",
    00212                         "01000000000000000000000000000013E974E72F8A6922031D2603CFE0D7",
    00213                         2),
    00214                 EcRecommendedParameters<EC2N>(ASN1::sect409k1(),
    00215                         409, 87, 0,
    00216                         "00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
    00217                         "00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001",
    00218                         "040060F05F658F49C1AD3AB1890F7184210EFD0987E307C84C27ACCFB8F9F67CC2C460189EB5AAAA62EE222EB1B35540CFE902374601E369050B7C4E42ACBA1DACBF04299C3460782F918EA427E6325165E9EA10E3DA5F6C42E9C55215AA9CA27A5863EC48D8E0286B",
    00219                         "7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFE5F83B2D4EA20400EC4557D5ED3E3E7CA5B4B5C83B8E01E5FCF",
    00220                         4),
    00221                 EcRecommendedParameters<EC2N>(ASN1::sect409r1(),
    00222                         409, 87, 0,
    00223                         "00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001",
    00224                         "0021A5C2C8EE9FEB5C4B9A753B7B476B7FD6422EF1F3DD674761FA99D6AC27C8A9A197B272822F6CD57A55AA4F50AE317B13545F",
    00225                         "04015D4860D088DDB3496B0C6064756260441CDE4AF1771D4DB01FFE5B34E59703DC255A868A1180515603AEAB60794E54BB7996A70061B1CFAB6BE5F32BBFA78324ED106A7636B9C5A7BD198D0158AA4F5488D08F38514F1FDF4B4F40D2181B3681C364BA0273C706",
    00226                         "010000000000000000000000000000000000000000000000000001E2AAD6A612F33307BE5FA47C3C9E052F838164CD37D9A21173",
    00227                         2),
    00228                 EcRecommendedParameters<EC2N>(ASN1::sect571k1(),
    00229                         571, 10, 5, 2, 0,
    00230                         "000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
    00231                         "000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001",
    00232                         "04026EB7A859923FBC82189631F8103FE4AC9CA2970012D5D46024804801841CA44370958493B205E647DA304DB4CEB08CBBD1BA39494776FB988B47174DCA88C7E2945283A01C89720349DC807F4FBF374F4AEADE3BCA95314DD58CEC9F307A54FFC61EFC006D8A2C9D4979C0AC44AEA74FBEBBB9F772AEDCB620B01A7BA7AF1B320430C8591984F601CD4C143EF1C7A3",
    00233                         "020000000000000000000000000000000000000000000000000000000000000000000000131850E1F19A63E4B391A8DB917F4138B630D84BE5D639381E91DEB45CFE778F637C1001",
    00234                         4),
    00235                 EcRecommendedParameters<EC2N>(ASN1::sect571r1(),
    00236                         571, 10, 5, 2, 0,
    00237                         "000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001",
    00238                         "02F40E7E2221F295DE297117B7F3D62F5C6A97FFCB8CEFF1CD6BA8CE4A9A18AD84FFABBD8EFA59332BE7AD6756A66E294AFD185A78FF12AA520E4DE739BACA0C7FFEFF7F2955727A",
    00239                         "040303001D34B856296C16C0D40D3CD7750A93D1D2955FA80AA5F40FC8DB7B2ABDBDE53950F4C0D293CDD711A35B67FB1499AE60038614F1394ABFA3B4C850D927E1E7769C8EEC2D19037BF27342DA639B6DCCFFFEB73D69D78C6C27A6009CBBCA1980F8533921E8A684423E43BAB08A576291AF8F461BB2A8B3531D2F0485C19B16E2F1516E23DD3C1A4827AF1B8AC15B",
    00240                         "03FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFE661CE18FF55987308059B186823851EC7DD9CA1161DE93D5174D66E8382E9BB2FE84E47",
    00241                         2),
    00242         };
    00243         begin = rec;
    00244         end = rec + sizeof(rec)/sizeof(rec[0]);
    00245 }
    00246
    00247 static void GetRecommendedParameters(const EcRecommendedParameters<ECP> *&begin, const EcRecommendedParameters<ECP> *&end)
    00248 {
    00249         // this array must be sorted by OID
    00250         static const EcRecommendedParameters<ECP> rec[] = {
    00251                 EcRecommendedParameters<ECP>(ASN1::secp192r1(),
    00252                         "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFFFFFFFFFFFF",
    00253                         "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFFFFFFFFFFFC",
    00254                         "64210519E59C80E70FA7E9AB72243049FEB8DEECC146B9B1",
    00255                         "04188DA80EB03090F67CBF20EB43A18800F4FF0AFD82FF101207192B95FFC8DA78631011ED6B24CDD573F977A11E794811",
    00256                         "FFFFFFFFFFFFFFFFFFFFFFFF99DEF836146BC9B1B4D22831",
    00257                         1),
    00258                 EcRecommendedParameters<ECP>(ASN1::secp256r1(),
    00259                         "FFFFFFFF00000001000000000000000000000000FFFFFFFFFFFFFFFFFFFFFFFF",
    00260                         "FFFFFFFF00000001000000000000000000000000FFFFFFFFFFFFFFFFFFFFFFFC",
    00261                         "5AC635D8AA3A93E7B3EBBD55769886BC651D06B0CC53B0F63BCE3C3E27D2604B",
    00262                         "046B17D1F2E12C4247F8BCE6E563A440F277037D812DEB33A0F4A13945D898C2964FE342E2FE1A7F9B8EE7EB4A7C0F9E162BCE33576B315ECECBB6406837BF51F5",
    00263                         "FFFFFFFF00000000FFFFFFFFFFFFFFFFBCE6FAADA7179E84F3B9CAC2FC632551",
    00264                         1),
    00265                 EcRecommendedParameters<ECP>(ASN1::secp112r1(),
    00266                         "DB7C2ABF62E35E668076BEAD208B",
    00267                         "DB7C2ABF62E35E668076BEAD2088",
    00268                         "659EF8BA043916EEDE8911702B22",
    00269                         "0409487239995A5EE76B55F9C2F098A89CE5AF8724C0A23E0E0FF77500",
    00270                         "DB7C2ABF62E35E7628DFAC6561C5",
    00271                         1),
    00272                 EcRecommendedParameters<ECP>(ASN1::secp112r2(),
    00273                         "DB7C2ABF62E35E668076BEAD208B",
    00274                         "6127C24C05F38A0AAAF65C0EF02C",
    00275                         "51DEF1815DB5ED74FCC34C85D709",
    00276                         "044BA30AB5E892B4E1649DD0928643ADCD46F5882E3747DEF36E956E97",
    00277                         "36DF0AAFD8B8D7597CA10520D04B",
    00278                         4),
    00279                 EcRecommendedParameters<ECP>(ASN1::secp160r1(),
    00280                         "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF7FFFFFFF",
    00281                         "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF7FFFFFFC",
    00282                         "1C97BEFC54BD7A8B65ACF89F81D4D4ADC565FA45",
    00283                         "044A96B5688EF573284664698968C38BB913CBFC8223A628553168947D59DCC912042351377AC5FB32",
    00284                         "0100000000000000000001F4C8F927AED3CA752257",
    00285                         1),
    00286                 EcRecommendedParameters<ECP>(ASN1::secp160k1(),
    00287                         "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFAC73",
    00288                         "0000000000000000000000000000000000000000",
    00289                         "0000000000000000000000000000000000000007",
    00290                         "043B4C382CE37AA192A4019E763036F4F5DD4D7EBB938CF935318FDCED6BC28286531733C3F03C4FEE",
    00291                         "0100000000000000000001B8FA16DFAB9ACA16B6B3",
    00292                         1),
    00293                 EcRecommendedParameters<ECP>(ASN1::secp256k1(),
    00294                         "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFC2F",
    00295                         "0000000000000000000000000000000000000000000000000000000000000000",
    00296                         "0000000000000000000000000000000000000000000000000000000000000007",
    00297                         "0479BE667EF9DCBBAC55A06295CE870B07029BFCDB2DCE28D959F2815B16F81798483ADA7726A3C4655DA4FBFC0E1108A8FD17B448A68554199C47D08FFB10D4B8",
    00298                         "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141",
    00299                         1),
    00300                 EcRecommendedParameters<ECP>(ASN1::secp128r1(),
    00301                         "FFFFFFFDFFFFFFFFFFFFFFFFFFFFFFFF",
    00302                         "FFFFFFFDFFFFFFFFFFFFFFFFFFFFFFFC",
    00303                         "E87579C11079F43DD824993C2CEE5ED3",
    00304                         "04161FF7528B899B2D0C28607CA52C5B86CF5AC8395BAFEB13C02DA292DDED7A83",
    00305                         "FFFFFFFE0000000075A30D1B9038A115",
    00306                         1),
    00307                 EcRecommendedParameters<ECP>(ASN1::secp128r2(),
    00308                         "FFFFFFFDFFFFFFFFFFFFFFFFFFFFFFFF",
    00309                         "D6031998D1B3BBFEBF59CC9BBFF9AEE1",
    00310                         "5EEEFCA380D02919DC2C6558BB6D8A5D",
    00311                         "047B6AA5D85E572983E6FB32A7CDEBC14027B6916A894D3AEE7106FE805FC34B44",
    00312                         "3FFFFFFF7FFFFFFFBE0024720613B5A3",
    00313                         4),
    00314                 EcRecommendedParameters<ECP>(ASN1::secp160r2(),
    00315                         "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFAC73",
    00316                         "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFAC70",
    00317                         "B4E134D3FB59EB8BAB57274904664D5AF50388BA",
    00318                         "0452DCB034293A117E1F4FF11B30F7199D3144CE6DFEAFFEF2E331F296E071FA0DF9982CFEA7D43F2E",
    00319                         "0100000000000000000000351EE786A818F3A1A16B",
    00320                         1),
    00321                 EcRecommendedParameters<ECP>(ASN1::secp192k1(),
    00322                         "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFEE37",
    00323                         "000000000000000000000000000000000000000000000000",
    00324                         "000000000000000000000000000000000000000000000003",
    00325                         "04DB4FF10EC057E9AE26B07D0280B7F4341DA5D1B1EAE06C7D9B2F2F6D9C5628A7844163D015BE86344082AA88D95E2F9D",
    00326                         "FFFFFFFFFFFFFFFFFFFFFFFE26F2FC170F69466A74DEFD8D",
    00327                         1),
    00328                 EcRecommendedParameters<ECP>(ASN1::secp224k1(),
    00329                         "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFE56D",
    00330                         "00000000000000000000000000000000000000000000000000000000",
    00331                         "00000000000000000000000000000000000000000000000000000005",
    00332                         "04A1455B334DF099DF30FC28A169A467E9E47075A90F7E650EB6B7A45C7E089FED7FBA344282CAFBD6F7E319F7C0B0BD59E2CA4BDB556D61A5",
    00333                         "010000000000000000000000000001DCE8D2EC6184CAF0A971769FB1F7",
    00334                         1),
    00335                 EcRecommendedParameters<ECP>(ASN1::secp224r1(),
    00336                         "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF000000000000000000000001",
    00337                         "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFE",
    00338                         "B4050A850C04B3ABF54132565044B0B7D7BFD8BA270B39432355FFB4",
    00339                         "04B70E0CBD6BB4BF7F321390B94A03C1D356C21122343280D6115C1D21BD376388B5F723FB4C22DFE6CD4375A05A07476444D5819985007E34",
    00340                         "FFFFFFFFFFFFFFFFFFFFFFFFFFFF16A2E0B8F03E13DD29455C5C2A3D",
    00341                         1),
    00342                 EcRecommendedParameters<ECP>(ASN1::secp384r1(),
    00343                         "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFFFF0000000000000000FFFFFFFF",
    00344                         "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFFFF0000000000000000FFFFFFFC",
    00345                         "B3312FA7E23EE7E4988E056BE3F82D19181D9C6EFE8141120314088F5013875AC656398D8A2ED19D2A85C8EDD3EC2AEF",
    00346                         "04AA87CA22BE8B05378EB1C71EF320AD746E1D3B628BA79B9859F741E082542A385502F25DBF55296C3A545E3872760AB73617DE4A96262C6F5D9E98BF9292DC29F8F41DBD289A147CE9DA3113B5F0B8C00A60B1CE1D7E819D7A431D7C90EA0E5F",
    00347                         "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFC7634D81F4372DDF581A0DB248B0A77AECEC196ACCC52973",
    00348                         1),
    00349                 EcRecommendedParameters<ECP>(ASN1::secp521r1(),
    00350                         "01FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF",
    00351                         "01FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFC",
    00352                         "0051953EB9618E1C9A1F929A21A0B68540EEA2DA725B99B315F3B8B489918EF109E156193951EC7E937B1652C0BD3BB1BF073573DF883D2C34F1EF451FD46B503F00",
    00353                         "0400C6858E06B70404E9CD9E3ECB662395B4429C648139053FB521F828AF606B4D3DBAA14B5E77EFE75928FE1DC127A2FFA8DE3348B3C1856A429BF97E7E31C2E5BD66011839296A789A3BC0045C8A5FB42C7D1BD998F54449579B446817AFBD17273E662C97EE72995EF42640C550B9013FAD0761353C7086A272C24088BE94769FD16650",
    00354                         "01FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFA51868783BF2F966B7FCC0148F709A5D03BB5C9B8899C47AEBB6FB71E91386409",
    00355                         1),
    00356         };
    00357         begin = rec;
    00358         end = rec + sizeof(rec)/sizeof(rec[0]);
    00359 }
    00360
    00361 template <class EC> OID DL_GroupParameters_EC<EC>::GetNextRecommendedParametersOID(const OID &oid)
    00362 {
    00363         const EcRecommendedParameters<EllipticCurve> *begin, *end;
    00364         GetRecommendedParameters(begin, end);
    00365         const EcRecommendedParameters<EllipticCurve> *it = std::upper_bound(begin, end, oid, OIDLessThan());
    00366         return (it == end ? OID() : it->oid);
    00367 }
    00368
    00369 template <class EC> void DL_GroupParameters_EC<EC>::Initialize(const OID &oid)
    00370 {
    00371         const EcRecommendedParameters<EllipticCurve> *begin, *end;
    00372         GetRecommendedParameters(begin, end);
    00373         const EcRecommendedParameters<EllipticCurve> *it = std::lower_bound(begin, end, oid, OIDLessThan());
    00374         if (it == end || it->oid != oid)
    00375                 throw UnknownOID();
    00376
    00377         const EcRecommendedParameters<EllipticCurve> &param = *it;
    00378         m_oid = oid;
    00379         std::auto_ptr<EllipticCurve> ec(param.NewEC());
    00380         this->m_groupPrecomputation.SetCurve(*ec);
    00381
    00382         StringSource ssG(param.g, true, new HexDecoder);
    00383         Element G;
    00384         bool result = GetCurve().DecodePoint(G, ssG, (size_t)ssG.MaxRetrievable());
    00385         SetSubgroupGenerator(G);
    00386         assert(result);
    00387
    00388         StringSource ssN(param.n, true, new HexDecoder);
    00389         m_n.Decode(ssN, (size_t)ssN.MaxRetrievable());
    00390         m_k = param.h;
    00391 }
    00392
    00393 template <class EC>
    00394 bool DL_GroupParameters_EC<EC>::GetVoidValue(const char *name, const std::type_info &valueType, void *pValue) const
    00395 {
    00396         if (strcmp(name, Name::GroupOID()) == 0)
    00397         {
    00398                 if (m_oid.m_values.empty())
    00399                         return false;
    00400
    00401                 this->ThrowIfTypeMismatch(name, typeid(OID), valueType);
    00402                 *reinterpret_cast<OID *>(pValue) = m_oid;
    00403                 return true;
    00404         }
    00405         else
    00406                 return GetValueHelper<DL_GroupParameters<Element> >(this, name, valueType, pValue).Assignable()
    00407                         CRYPTOPP_GET_FUNCTION_ENTRY(Curve);
    00408 }
    00409
    00410 template <class EC>
    00411 void DL_GroupParameters_EC<EC>::AssignFrom(const NameValuePairs &source)
    00412 {
    00413         OID oid;
    00414         if (source.GetValue(Name::GroupOID(), oid))
    00415                 Initialize(oid);
    00416         else
    00417         {
    00418                 EllipticCurve ec;
    00419                 Point G;
    00420                 Integer n;
    00421
    00422                 source.GetRequiredParameter("DL_GroupParameters_EC<EC>", Name::Curve(), ec);
    00423                 source.GetRequiredParameter("DL_GroupParameters_EC<EC>", Name::SubgroupGenerator(), G);
    00424                 source.GetRequiredParameter("DL_GroupParameters_EC<EC>", Name::SubgroupOrder(), n);
    00425                 Integer k = source.GetValueWithDefault(Name::Cofactor(), Integer::Zero());
    00426
    00427                 Initialize(ec, G, n, k);
    00428         }
    00429 }
    00430
    00431 template <class EC>
    00432 void DL_GroupParameters_EC<EC>::GenerateRandom(RandomNumberGenerator &rng, const NameValuePairs &alg)
    00433 {
    00434         try
    00435         {
    00436                 AssignFrom(alg);
    00437         }
    00438         catch (InvalidArgument &)
    00439         {
    00440                 throw NotImplemented("DL_GroupParameters_EC<EC>: curve generation is not implemented yet");
    00441         }
    00442 }
    00443
    00444 template <class EC>
    00445 void DL_GroupParameters_EC<EC>::BERDecode(BufferedTransformation &bt)
    00446 {
    00447         byte b;
    00448         if (!bt.Peek(b))
    00449                 BERDecodeError();
    00450         if (b == OBJECT_IDENTIFIER)
    00451                 Initialize(OID(bt));
    00452         else
    00453         {
    00454                 BERSequenceDecoder seq(bt);
    00455                         word32 version;
    00456                         BERDecodeUnsigned<word32>(seq, version, INTEGER, 1, 1); // check version
    00457                         EllipticCurve ec(seq);
    00458                         Point G = ec.BERDecodePoint(seq);
    00459                         Integer n(seq);
    00460                         Integer k;
    00461                         bool cofactorPresent = !seq.EndReached();
    00462                         if (cofactorPresent)
    00463                                 k.BERDecode(seq);
    00464                         else
    00465                                 k = Integer::Zero();
    00466                 seq.MessageEnd();
    00467
    00468                 Initialize(ec, G, n, k);
    00469         }
    00470 }
    00471
    00472 template <class EC>
    00473 void DL_GroupParameters_EC<EC>::DEREncode(BufferedTransformation &bt) const
    00474 {
    00475         if (m_encodeAsOID && !m_oid.m_values.empty())
    00476                 m_oid.DEREncode(bt);
    00477         else
    00478         {
    00479                 DERSequenceEncoder seq(bt);
    00480                 DEREncodeUnsigned<word32>(seq, 1);      // version
    00481                 GetCurve().DEREncode(seq);
    00482                 GetCurve().DEREncodePoint(seq, this->GetSubgroupGenerator(), m_compress);
    00483                 m_n.DEREncode(seq);
    00484                 if (m_k.NotZero())
    00485                         m_k.DEREncode(seq);
    00486                 seq.MessageEnd();
    00487         }
    00488 }
    00489
    00490 template <class EC>
    00491 Integer DL_GroupParameters_EC<EC>::GetCofactor() const
    00492 {
    00493         if (!m_k)
    00494         {
    00495                 Integer q = GetCurve().FieldSize();
    00496                 Integer qSqrt = q.SquareRoot();
    00497                 m_k = (q+2*qSqrt+1)/m_n;
    00498         }
    00499
    00500         return m_k;
    00501 }
    00502
    00503 template <class EC>
    00504 Integer DL_GroupParameters_EC<EC>::ConvertElementToInteger(const Element &element) const
    00505 {
    00506         return ConvertToInteger(element.x);
    00507 };
    00508
    00509 template <class EC>
    00510 bool DL_GroupParameters_EC<EC>::ValidateGroup(RandomNumberGenerator &rng, unsigned int level) const
    00511 {
    00512         bool pass = GetCurve().ValidateParameters(rng, level);
    00513
    00514         Integer q = GetCurve().FieldSize();
    00515         pass = pass && m_n!=q;
    00516
    00517         if (level >= 2)
    00518         {
    00519                 Integer qSqrt = q.SquareRoot();
    00520                 pass = pass && m_n>4*qSqrt;
    00521                 pass = pass && VerifyPrime(rng, m_n, level-2);
    00522                 pass = pass && (m_k.IsZero() || m_k == (q+2*qSqrt+1)/m_n);
    00523                 pass = pass && CheckMOVCondition(q, m_n);
    00524         }
    00525
    00526         return pass;
    00527 }
    00528
    00529 template <class EC>
    00530 bool DL_GroupParameters_EC<EC>::ValidateElement(unsigned int level, const Element &g, const DL_FixedBasePrecomputation<Element> *gpc) const
    00531 {
    00532         bool pass = !IsIdentity(g) && GetCurve().VerifyPoint(g);
    00533         if (level >= 1)
    00534         {
    00535                 if (gpc)
    00536                         pass = pass && gpc->Exponentiate(this->GetGroupPrecomputation(), Integer::One()) == g;
    00537         }
    00538         if (level >= 2)
    00539         {
    00540                 const Integer &q = GetSubgroupOrder();
    00541                 pass = pass && IsIdentity(gpc ? gpc->Exponentiate(this->GetGroupPrecomputation(), q) : ExponentiateElement(g, q));
    00542         }
    00543         return pass;
    00544 }
    00545
    00546 template <class EC>
    00547 void DL_GroupParameters_EC<EC>::SimultaneousExponentiate(Element *results, const Element &base, const Integer *exponents, unsigned int exponentsCount) const
    00548 {
    00549         GetCurve().SimultaneousMultiply(results, base, exponents, exponentsCount);
    00550 }
    00551
    00552 template <class EC>
    00553 CPP_TYPENAME DL_GroupParameters_EC<EC>::Element DL_GroupParameters_EC<EC>::MultiplyElements(const Element &a, const Element &b) const
    00554 {
    00555         return GetCurve().Add(a, b);
    00556 }
    00557
    00558 template <class EC>
    00559 CPP_TYPENAME DL_GroupParameters_EC<EC>::Element DL_GroupParameters_EC<EC>::CascadeExponentiate(const Element &element1, const Integer &exponent1, const Element &element2, const Integer &exponent2) const
    00560 {
    00561         return GetCurve().CascadeMultiply(exponent1, element1, exponent2, element2);
    00562 }
    00563
    00564 template <class EC>
    00565 OID DL_GroupParameters_EC<EC>::GetAlgorithmID() const
    00566 {
    00567         return ASN1::id_ecPublicKey();
    00568 }
    00569
    00570 // ******************************************************************
    00571
    00572 template <class EC>
    00573 void DL_PublicKey_EC<EC>::BERDecodeKey2(BufferedTransformation &bt, bool parametersPresent, size_t size)
    00574 {
    00575         typename EC::Point P;
    00576         if (!this->GetGroupParameters().GetCurve().DecodePoint(P, bt, size))
    00577                 BERDecodeError();
    00578         SetPublicElement(P);
    00579 }
    00580
    00581 template <class EC>
    00582 void DL_PublicKey_EC<EC>::DEREncodeKey(BufferedTransformation &bt) const
    00583 {
    00584         this->GetGroupParameters().GetCurve().EncodePoint(bt, this->GetPublicElement(), this->GetGroupParameters().GetPointCompression());
    00585 }
    00586
    00587 // ******************************************************************
    00588
    00589 template <class EC>
    00590 void DL_PrivateKey_EC<EC>::BERDecodeKey2(BufferedTransformation &bt, bool parametersPresent, size_t size)
    00591 {
    00592         BERSequenceDecoder seq(bt);
    00593                 word32 version;
    00594                 BERDecodeUnsigned<word32>(seq, version, INTEGER, 1, 1); // check version
    00595
    00596                 BERGeneralDecoder dec(seq, OCTET_STRING);
    00597                 if (!dec.IsDefiniteLength())
    00598                         BERDecodeError();
    00599                 Integer x;
    00600                 x.Decode(dec, (size_t)dec.RemainingLength());
    00601                 dec.MessageEnd();
    00602                 if (!parametersPresent && seq.PeekByte() != (CONTEXT_SPECIFIC | CONSTRUCTED | 0))
    00603                         BERDecodeError();
    00604                 if (!seq.EndReached() && seq.PeekByte() == (CONTEXT_SPECIFIC | CONSTRUCTED | 0))
    00605                 {
    00606                         BERGeneralDecoder parameters(seq, CONTEXT_SPECIFIC | CONSTRUCTED | 0);
    00607                         this->AccessGroupParameters().BERDecode(parameters);
    00608                         parameters.MessageEnd();
    00609                 }
    00610                 if (!seq.EndReached())
    00611                 {
    00612                         // skip over the public element
    00613                         SecByteBlock subjectPublicKey;
    00614                         unsigned int unusedBits;
    00615                         BERGeneralDecoder publicKey(seq, CONTEXT_SPECIFIC | CONSTRUCTED | 1);
    00616                         BERDecodeBitString(publicKey, subjectPublicKey, unusedBits);
    00617                         publicKey.MessageEnd();
    00618                         Element Q;
    00619                         if (!(unusedBits == 0 && this->GetGroupParameters().GetCurve().DecodePoint(Q, subjectPublicKey, subjectPublicKey.size())))
    00620                                 BERDecodeError();
    00621                 }
    00622         seq.MessageEnd();
    00623
    00624         this->SetPrivateExponent(x);
    00625 }
    00626
    00627 template <class EC>
    00628 void DL_PrivateKey_EC<EC>::DEREncodeKey(BufferedTransformation &bt) const
    00629 {
    00630         DERSequenceEncoder privateKey(bt);
    00631                 DEREncodeUnsigned<word32>(privateKey, 1);       // version
    00632                 // SEC 1 ver 1.0 says privateKey (m_d) has the same length as order of the curve
    00633                 // this will be changed to order of base point in a future version
    00634                 this->GetPrivateExponent().DEREncodeAsOctetString(privateKey, this->GetGroupParameters().GetSubgroupOrder().ByteCount());
    00635         privateKey.MessageEnd();
    00636 }
    00637
    00638 NAMESPACE_END
    00639
    00640 #endif