00001
00002
00003 #include "pch.h"
00004 #include "rsa.h"
00005 #include "asn.h"
00006 #include "oids.h"
00007 #include "modarith.h"
00008 #include "nbtheory.h"
00009 #include "sha.h"
00010 #include "algparam.h"
00011 #include "fips140.h"
00012
00013 #if !defined(NDEBUG) && !defined(CRYPTOPP_IS_DLL)
00014 #include "pssr.h"
00015 NAMESPACE_BEGIN(CryptoPP)
00016 void RSA_TestInstantiations()
00017 {
00018 RSASS<PKCS1v15, SHA>::Verifier x1(1, 1);
00019 RSASS<PKCS1v15, SHA>::Signer x2(NullRNG(), 1);
00020 RSASS<PKCS1v15, SHA>::Verifier x3(x2);
00021 RSASS<PKCS1v15, SHA>::Verifier x4(x2.GetKey());
00022 RSASS<PSS, SHA>::Verifier x5(x3);
00023 #ifndef __MWERKS__
00024 RSASS<PSSR, SHA>::Signer x6 = x2;
00025 x3 = x2;
00026 x6 = x2;
00027 #endif
00028 RSAES<PKCS1v15>::Encryptor x7(x2);
00029 #ifndef __GNUC__
00030 RSAES<PKCS1v15>::Encryptor x8(x3);
00031 #endif
00032 RSAES<OAEP<SHA> >::Encryptor x9(x2);
00033
00034 x4 = x2.GetKey();
00035 }
00036 NAMESPACE_END
00037 #endif
00038
00039 #ifndef CRYPTOPP_IMPORTS
00040
00041 NAMESPACE_BEGIN(CryptoPP)
00042
00043 OID RSAFunction::GetAlgorithmID() const
00044 {
00045 return ASN1::rsaEncryption();
00046 }
00047
00048 void RSAFunction::BERDecodePublicKey(BufferedTransformation &bt, bool, size_t)
00049 {
00050 BERSequenceDecoder seq(bt);
00051 m_n.BERDecode(seq);
00052 m_e.BERDecode(seq);
00053 seq.MessageEnd();
00054 }
00055
00056 void RSAFunction::DEREncodePublicKey(BufferedTransformation &bt) const
00057 {
00058 DERSequenceEncoder seq(bt);
00059 m_n.DEREncode(seq);
00060 m_e.DEREncode(seq);
00061 seq.MessageEnd();
00062 }
00063
00064 Integer RSAFunction::ApplyFunction(const Integer &x) const
00065 {
00066 DoQuickSanityCheck();
00067 return a_exp_b_mod_c(x, m_e, m_n);
00068 }
00069
00070 bool RSAFunction::Validate(RandomNumberGenerator &rng, unsigned int level) const
00071 {
00072 bool pass = true;
00073 pass = pass && m_n > Integer::One() && m_n.IsOdd();
00074 pass = pass && m_e > Integer::One() && m_e.IsOdd() && m_e < m_n;
00075 return pass;
00076 }
00077
00078 bool RSAFunction::GetVoidValue(const char *name, const std::type_info &valueType, void *pValue) const
00079 {
00080 return GetValueHelper(this, name, valueType, pValue).Assignable()
00081 CRYPTOPP_GET_FUNCTION_ENTRY(Modulus)
00082 CRYPTOPP_GET_FUNCTION_ENTRY(PublicExponent)
00083 ;
00084 }
00085
00086 void RSAFunction::AssignFrom(const NameValuePairs &source)
00087 {
00088 AssignFromHelper(this, source)
00089 CRYPTOPP_SET_FUNCTION_ENTRY(Modulus)
00090 CRYPTOPP_SET_FUNCTION_ENTRY(PublicExponent)
00091 ;
00092 }
00093
00094
00095
00096 class RSAPrimeSelector : public PrimeSelector
00097 {
00098 public:
00099 RSAPrimeSelector(const Integer &e) : m_e(e) {}
00100 bool IsAcceptable(const Integer &candidate) const {return RelativelyPrime(m_e, candidate-Integer::One());}
00101 Integer m_e;
00102 };
00103
00104 void InvertibleRSAFunction::GenerateRandom(RandomNumberGenerator &rng, const NameValuePairs &alg)
00105 {
00106 int modulusSize = 2048;
00107 alg.GetIntValue(Name::ModulusSize(), modulusSize) || alg.GetIntValue(Name::KeySize(), modulusSize);
00108
00109 if (modulusSize < 16)
00110 throw InvalidArgument("InvertibleRSAFunction: specified modulus size is too small");
00111
00112 m_e = alg.GetValueWithDefault(Name::PublicExponent(), Integer(17));
00113
00114 if (m_e < 3 || m_e.IsEven())
00115 throw InvalidArgument("InvertibleRSAFunction: invalid public exponent");
00116
00117 RSAPrimeSelector selector(m_e);
00118 AlgorithmParameters primeParam = MakeParametersForTwoPrimesOfEqualSize(modulusSize)
00119 (Name::PointerToPrimeSelector(), selector.GetSelectorPointer());
00120 m_p.GenerateRandom(rng, primeParam);
00121 m_q.GenerateRandom(rng, primeParam);
00122
00123 m_d = m_e.InverseMod(LCM(m_p-1, m_q-1));
00124 assert(m_d.IsPositive());
00125
00126 m_dp = m_d % (m_p-1);
00127 m_dq = m_d % (m_q-1);
00128 m_n = m_p * m_q;
00129 m_u = m_q.InverseMod(m_p);
00130
00131 if (FIPS_140_2_ComplianceEnabled())
00132 {
00133 RSASS<PKCS1v15, SHA>::Signer signer(*this);
00134 RSASS<PKCS1v15, SHA>::Verifier verifier(signer);
00135 SignaturePairwiseConsistencyTest_FIPS_140_Only(signer, verifier);
00136
00137 RSAES<OAEP<SHA> >::Decryptor decryptor(*this);
00138 RSAES<OAEP<SHA> >::Encryptor encryptor(decryptor);
00139 EncryptionPairwiseConsistencyTest_FIPS_140_Only(encryptor, decryptor);
00140 }
00141 }
00142
00143 void InvertibleRSAFunction::Initialize(RandomNumberGenerator &rng, unsigned int keybits, const Integer &e)
00144 {
00145 GenerateRandom(rng, MakeParameters(Name::ModulusSize(), (int)keybits)(Name::PublicExponent(), e+e.IsEven()));
00146 }
00147
00148 void InvertibleRSAFunction::Initialize(const Integer &n, const Integer &e, const Integer &d)
00149 {
00150 if (n.IsEven() || e.IsEven() | d.IsEven())
00151 throw InvalidArgument("InvertibleRSAFunction: input is not a valid RSA private key");
00152
00153 m_n = n;
00154 m_e = e;
00155 m_d = d;
00156
00157 Integer r = --(d*e);
00158 unsigned int s = 0;
00159 while (r.IsEven())
00160 {
00161 r >>= 1;
00162 s++;
00163 }
00164
00165 ModularArithmetic modn(n);
00166 for (Integer i = 2; ; ++i)
00167 {
00168 Integer a = modn.Exponentiate(i, r);
00169 if (a == 1)
00170 continue;
00171 Integer b;
00172 unsigned int j = 0;
00173 while (a != n-1)
00174 {
00175 b = modn.Square(a);
00176 if (b == 1)
00177 {
00178 m_p = GCD(a-1, n);
00179 m_q = n/m_p;
00180 m_dp = m_d % (m_p-1);
00181 m_dq = m_d % (m_q-1);
00182 m_u = m_q.InverseMod(m_p);
00183 return;
00184 }
00185 if (++j == s)
00186 throw InvalidArgument("InvertibleRSAFunction: input is not a valid RSA private key");
00187 a = b;
00188 }
00189 }
00190 }
00191
00192 void InvertibleRSAFunction::BERDecodePrivateKey(BufferedTransformation &bt, bool, size_t)
00193 {
00194 BERSequenceDecoder privateKey(bt);
00195 word32 version;
00196 BERDecodeUnsigned<word32>(privateKey, version, INTEGER, 0, 0);
00197 m_n.BERDecode(privateKey);
00198 m_e.BERDecode(privateKey);
00199 m_d.BERDecode(privateKey);
00200 m_p.BERDecode(privateKey);
00201 m_q.BERDecode(privateKey);
00202 m_dp.BERDecode(privateKey);
00203 m_dq.BERDecode(privateKey);
00204 m_u.BERDecode(privateKey);
00205 privateKey.MessageEnd();
00206 }
00207
00208 void InvertibleRSAFunction::DEREncodePrivateKey(BufferedTransformation &bt) const
00209 {
00210 DERSequenceEncoder privateKey(bt);
00211 DEREncodeUnsigned<word32>(privateKey, 0);
00212 m_n.DEREncode(privateKey);
00213 m_e.DEREncode(privateKey);
00214 m_d.DEREncode(privateKey);
00215 m_p.DEREncode(privateKey);
00216 m_q.DEREncode(privateKey);
00217 m_dp.DEREncode(privateKey);
00218 m_dq.DEREncode(privateKey);
00219 m_u.DEREncode(privateKey);
00220 privateKey.MessageEnd();
00221 }
00222
00223 Integer InvertibleRSAFunction::CalculateInverse(RandomNumberGenerator &rng, const Integer &x) const
00224 {
00225 DoQuickSanityCheck();
00226 ModularArithmetic modn(m_n);
00227 Integer r, rInv;
00228 do {
00229 r.Randomize(rng, Integer::One(), m_n - Integer::One());
00230 rInv = modn.MultiplicativeInverse(r);
00231 } while (rInv.IsZero());
00232 Integer re = modn.Exponentiate(r, m_e);
00233 re = modn.Multiply(re, x);
00234
00235
00236 Integer y = ModularRoot(re, m_dq, m_dp, m_q, m_p, m_u);
00237 y = modn.Multiply(y, rInv);
00238 if (modn.Exponentiate(y, m_e) != x)
00239 throw Exception(Exception::OTHER_ERROR, "InvertibleRSAFunction: computational error during private key operation");
00240 return y;
00241 }
00242
00243 bool InvertibleRSAFunction::Validate(RandomNumberGenerator &rng, unsigned int level) const
00244 {
00245 bool pass = RSAFunction::Validate(rng, level);
00246 pass = pass && m_p > Integer::One() && m_p.IsOdd() && m_p < m_n;
00247 pass = pass && m_q > Integer::One() && m_q.IsOdd() && m_q < m_n;
00248 pass = pass && m_d > Integer::One() && m_d.IsOdd() && m_d < m_n;
00249 pass = pass && m_dp > Integer::One() && m_dp.IsOdd() && m_dp < m_p;
00250 pass = pass && m_dq > Integer::One() && m_dq.IsOdd() && m_dq < m_q;
00251 pass = pass && m_u.IsPositive() && m_u < m_p;
00252 if (level >= 1)
00253 {
00254 pass = pass && m_p * m_q == m_n;
00255 pass = pass && m_e*m_d % LCM(m_p-1, m_q-1) == 1;
00256 pass = pass && m_dp == m_d%(m_p-1) && m_dq == m_d%(m_q-1);
00257 pass = pass && m_u * m_q % m_p == 1;
00258 }
00259 if (level >= 2)
00260 pass = pass && VerifyPrime(rng, m_p, level-2) && VerifyPrime(rng, m_q, level-2);
00261 return pass;
00262 }
00263
00264 bool InvertibleRSAFunction::GetVoidValue(const char *name, const std::type_info &valueType, void *pValue) const
00265 {
00266 return GetValueHelper<RSAFunction>(this, name, valueType, pValue).Assignable()
00267 CRYPTOPP_GET_FUNCTION_ENTRY(Prime1)
00268 CRYPTOPP_GET_FUNCTION_ENTRY(Prime2)
00269 CRYPTOPP_GET_FUNCTION_ENTRY(PrivateExponent)
00270 CRYPTOPP_GET_FUNCTION_ENTRY(ModPrime1PrivateExponent)
00271 CRYPTOPP_GET_FUNCTION_ENTRY(ModPrime2PrivateExponent)
00272 CRYPTOPP_GET_FUNCTION_ENTRY(MultiplicativeInverseOfPrime2ModPrime1)
00273 ;
00274 }
00275
00276 void InvertibleRSAFunction::AssignFrom(const NameValuePairs &source)
00277 {
00278 AssignFromHelper<RSAFunction>(this, source)
00279 CRYPTOPP_SET_FUNCTION_ENTRY(Prime1)
00280 CRYPTOPP_SET_FUNCTION_ENTRY(Prime2)
00281 CRYPTOPP_SET_FUNCTION_ENTRY(PrivateExponent)
00282 CRYPTOPP_SET_FUNCTION_ENTRY(ModPrime1PrivateExponent)
00283 CRYPTOPP_SET_FUNCTION_ENTRY(ModPrime2PrivateExponent)
00284 CRYPTOPP_SET_FUNCTION_ENTRY(MultiplicativeInverseOfPrime2ModPrime1)
00285 ;
00286 }
00287
00288
00289
00290 Integer RSAFunction_ISO::ApplyFunction(const Integer &x) const
00291 {
00292 Integer t = RSAFunction::ApplyFunction(x);
00293 return t % 16 == 12 ? t : m_n - t;
00294 }
00295
00296 Integer InvertibleRSAFunction_ISO::CalculateInverse(RandomNumberGenerator &rng, const Integer &x) const
00297 {
00298 Integer t = InvertibleRSAFunction::CalculateInverse(rng, x);
00299 return STDMIN(t, m_n-t);
00300 }
00301
00302 NAMESPACE_END
00303
00304 #endif