1 files changed, 304 insertions, 0 deletions

diff --git a/CryptoPP/rsa.cpp b/CryptoPP/rsa.cpp
new file mode 100644
index 000000000..59449c40e
--- /dev/null
+++ b/CryptoPP/rsa.cpp
@@ -0,0 +1,304 @@
+// rsa.cpp - written and placed in the public domain by Wei Dai
+
+#include "pch.h"
+#include "rsa.h"
+#include "asn.h"
+#include "oids.h"
+#include "modarith.h"
+#include "nbtheory.h"
+#include "sha.h"
+#include "algparam.h"
+#include "fips140.h"
+
+#if !defined(NDEBUG) && !defined(CRYPTOPP_IS_DLL)
+#include "pssr.h"
+NAMESPACE_BEGIN(CryptoPP)
+void RSA_TestInstantiations()
+{
+	RSASS<PKCS1v15, SHA>::Verifier x1(1, 1);
+	RSASS<PKCS1v15, SHA>::Signer x2(NullRNG(), 1);
+	RSASS<PKCS1v15, SHA>::Verifier x3(x2);
+	RSASS<PKCS1v15, SHA>::Verifier x4(x2.GetKey());
+	RSASS<PSS, SHA>::Verifier x5(x3);
+#ifndef __MWERKS__
+	RSASS<PSSR, SHA>::Signer x6 = x2;
+	x3 = x2;
+	x6 = x2;
+#endif
+	RSAES<PKCS1v15>::Encryptor x7(x2);
+#ifndef __GNUC__
+	RSAES<PKCS1v15>::Encryptor x8(x3);
+#endif
+	RSAES<OAEP<SHA> >::Encryptor x9(x2);
+
+	x4 = x2.GetKey();
+}
+NAMESPACE_END
+#endif
+
+#ifndef CRYPTOPP_IMPORTS
+
+NAMESPACE_BEGIN(CryptoPP)
+
+OID RSAFunction::GetAlgorithmID() const
+{
+	return ASN1::rsaEncryption();
+}
+
+void RSAFunction::BERDecodePublicKey(BufferedTransformation &bt, bool, size_t)
+{
+	BERSequenceDecoder seq(bt);
+		m_n.BERDecode(seq);
+		m_e.BERDecode(seq);
+	seq.MessageEnd();
+}
+
+void RSAFunction::DEREncodePublicKey(BufferedTransformation &bt) const
+{
+	DERSequenceEncoder seq(bt);
+		m_n.DEREncode(seq);
+		m_e.DEREncode(seq);
+	seq.MessageEnd();
+}
+
+Integer RSAFunction::ApplyFunction(const Integer &x) const
+{
+	DoQuickSanityCheck();
+	return a_exp_b_mod_c(x, m_e, m_n);
+}
+
+bool RSAFunction::Validate(RandomNumberGenerator &rng, unsigned int level) const
+{
+	bool pass = true;
+	pass = pass && m_n > Integer::One() && m_n.IsOdd();
+	pass = pass && m_e > Integer::One() && m_e.IsOdd() && m_e < m_n;
+	return pass;
+}
+
+bool RSAFunction::GetVoidValue(const char *name, const std::type_info &valueType, void *pValue) const
+{
+	return GetValueHelper(this, name, valueType, pValue).Assignable()
+		CRYPTOPP_GET_FUNCTION_ENTRY(Modulus)
+		CRYPTOPP_GET_FUNCTION_ENTRY(PublicExponent)
+		;
+}
+
+void RSAFunction::AssignFrom(const NameValuePairs &source)
+{
+	AssignFromHelper(this, source)
+		CRYPTOPP_SET_FUNCTION_ENTRY(Modulus)
+		CRYPTOPP_SET_FUNCTION_ENTRY(PublicExponent)
+		;
+}
+
+// *****************************************************************************
+
+class RSAPrimeSelector : public PrimeSelector
+{
+public:
+	RSAPrimeSelector(const Integer &e) : m_e(e) {}
+	bool IsAcceptable(const Integer &candidate) const {return RelativelyPrime(m_e, candidate-Integer::One());}
+	Integer m_e;
+};
+
+void InvertibleRSAFunction::GenerateRandom(RandomNumberGenerator &rng, const NameValuePairs &alg)
+{
+	int modulusSize = 2048;
+	alg.GetIntValue(Name::ModulusSize(), modulusSize) || alg.GetIntValue(Name::KeySize(), modulusSize);
+
+	if (modulusSize < 16)
+		throw InvalidArgument("InvertibleRSAFunction: specified modulus size is too small");
+
+	m_e = alg.GetValueWithDefault(Name::PublicExponent(), Integer(17));
+
+	if (m_e < 3 || m_e.IsEven())
+		throw InvalidArgument("InvertibleRSAFunction: invalid public exponent");
+
+	RSAPrimeSelector selector(m_e);
+	AlgorithmParameters primeParam = MakeParametersForTwoPrimesOfEqualSize(modulusSize)
+		(Name::PointerToPrimeSelector(), selector.GetSelectorPointer());
+	m_p.GenerateRandom(rng, primeParam);
+	m_q.GenerateRandom(rng, primeParam);
+
+	m_d = m_e.InverseMod(LCM(m_p-1, m_q-1));
+	assert(m_d.IsPositive());
+
+	m_dp = m_d % (m_p-1);
+	m_dq = m_d % (m_q-1);
+	m_n = m_p * m_q;
+	m_u = m_q.InverseMod(m_p);
+
+	if (FIPS_140_2_ComplianceEnabled())
+	{
+		RSASS<PKCS1v15, SHA>::Signer signer(*this);
+		RSASS<PKCS1v15, SHA>::Verifier verifier(signer);
+		SignaturePairwiseConsistencyTest_FIPS_140_Only(signer, verifier);
+
+		RSAES<OAEP<SHA> >::Decryptor decryptor(*this);
+		RSAES<OAEP<SHA> >::Encryptor encryptor(decryptor);
+		EncryptionPairwiseConsistencyTest_FIPS_140_Only(encryptor, decryptor);
+	}
+}
+
+void InvertibleRSAFunction::Initialize(RandomNumberGenerator &rng, unsigned int keybits, const Integer &e)
+{
+	GenerateRandom(rng, MakeParameters(Name::ModulusSize(), (int)keybits)(Name::PublicExponent(), e+e.IsEven()));
+}
+
+void InvertibleRSAFunction::Initialize(const Integer &n, const Integer &e, const Integer &d)
+{
+	if (n.IsEven() || e.IsEven() | d.IsEven())
+		throw InvalidArgument("InvertibleRSAFunction: input is not a valid RSA private key");
+
+	m_n = n;
+	m_e = e;
+	m_d = d;
+
+	Integer r = --(d*e);
+	unsigned int s = 0;
+	while (r.IsEven())
+	{
+		r >>= 1;
+		s++;
+	}
+
+	ModularArithmetic modn(n);
+	for (Integer i = 2; ; ++i)
+	{
+		Integer a = modn.Exponentiate(i, r);
+		if (a == 1)
+			continue;
+		Integer b;
+		unsigned int j = 0;
+		while (a != n-1)
+		{
+			b = modn.Square(a);
+			if (b == 1)
+			{
+				m_p = GCD(a-1, n);
+				m_q = n/m_p;
+				m_dp = m_d % (m_p-1);
+				m_dq = m_d % (m_q-1);
+				m_u = m_q.InverseMod(m_p);
+				return;
+			}
+			if (++j == s)
+				throw InvalidArgument("InvertibleRSAFunction: input is not a valid RSA private key");
+			a = b;
+		}
+	}
+}
+
+void InvertibleRSAFunction::BERDecodePrivateKey(BufferedTransformation &bt, bool, size_t)
+{
+	BERSequenceDecoder privateKey(bt);
+		word32 version;
+		BERDecodeUnsigned<word32>(privateKey, version, INTEGER, 0, 0);	// check version
+		m_n.BERDecode(privateKey);
+		m_e.BERDecode(privateKey);
+		m_d.BERDecode(privateKey);
+		m_p.BERDecode(privateKey);
+		m_q.BERDecode(privateKey);
+		m_dp.BERDecode(privateKey);
+		m_dq.BERDecode(privateKey);
+		m_u.BERDecode(privateKey);
+	privateKey.MessageEnd();
+}
+
+void InvertibleRSAFunction::DEREncodePrivateKey(BufferedTransformation &bt) const
+{
+	DERSequenceEncoder privateKey(bt);
+		DEREncodeUnsigned<word32>(privateKey, 0);	// version
+		m_n.DEREncode(privateKey);
+		m_e.DEREncode(privateKey);
+		m_d.DEREncode(privateKey);
+		m_p.DEREncode(privateKey);
+		m_q.DEREncode(privateKey);
+		m_dp.DEREncode(privateKey);
+		m_dq.DEREncode(privateKey);
+		m_u.DEREncode(privateKey);
+	privateKey.MessageEnd();
+}
+
+Integer InvertibleRSAFunction::CalculateInverse(RandomNumberGenerator &rng, const Integer &x) const 
+{
+	DoQuickSanityCheck();
+	ModularArithmetic modn(m_n);
+	Integer r, rInv;
+	do {	// do this in a loop for people using small numbers for testing
+		r.Randomize(rng, Integer::One(), m_n - Integer::One());
+		rInv = modn.MultiplicativeInverse(r);
+	} while (rInv.IsZero());
+	Integer re = modn.Exponentiate(r, m_e);
+	re = modn.Multiply(re, x);			// blind
+	// here we follow the notation of PKCS #1 and let u=q inverse mod p
+	// but in ModRoot, u=p inverse mod q, so we reverse the order of p and q
+	Integer y = ModularRoot(re, m_dq, m_dp, m_q, m_p, m_u);
+	y = modn.Multiply(y, rInv);				// unblind
+	if (modn.Exponentiate(y, m_e) != x)		// check
+		throw Exception(Exception::OTHER_ERROR, "InvertibleRSAFunction: computational error during private key operation");
+	return y;
+}
+
+bool InvertibleRSAFunction::Validate(RandomNumberGenerator &rng, unsigned int level) const
+{
+	bool pass = RSAFunction::Validate(rng, level);
+	pass = pass && m_p > Integer::One() && m_p.IsOdd() && m_p < m_n;
+	pass = pass && m_q > Integer::One() && m_q.IsOdd() && m_q < m_n;
+	pass = pass && m_d > Integer::One() && m_d.IsOdd() && m_d < m_n;
+	pass = pass && m_dp > Integer::One() && m_dp.IsOdd() && m_dp < m_p;
+	pass = pass && m_dq > Integer::One() && m_dq.IsOdd() && m_dq < m_q;
+	pass = pass && m_u.IsPositive() && m_u < m_p;
+	if (level >= 1)
+	{
+		pass = pass && m_p * m_q == m_n;
+		pass = pass && m_e*m_d % LCM(m_p-1, m_q-1) == 1;
+		pass = pass && m_dp == m_d%(m_p-1) && m_dq == m_d%(m_q-1);
+		pass = pass && m_u * m_q % m_p == 1;
+	}
+	if (level >= 2)
+		pass = pass && VerifyPrime(rng, m_p, level-2) && VerifyPrime(rng, m_q, level-2);
+	return pass;
+}
+
+bool InvertibleRSAFunction::GetVoidValue(const char *name, const std::type_info &valueType, void *pValue) const
+{
+	return GetValueHelper<RSAFunction>(this, name, valueType, pValue).Assignable()
+		CRYPTOPP_GET_FUNCTION_ENTRY(Prime1)
+		CRYPTOPP_GET_FUNCTION_ENTRY(Prime2)
+		CRYPTOPP_GET_FUNCTION_ENTRY(PrivateExponent)
+		CRYPTOPP_GET_FUNCTION_ENTRY(ModPrime1PrivateExponent)
+		CRYPTOPP_GET_FUNCTION_ENTRY(ModPrime2PrivateExponent)
+		CRYPTOPP_GET_FUNCTION_ENTRY(MultiplicativeInverseOfPrime2ModPrime1)
+		;
+}
+
+void InvertibleRSAFunction::AssignFrom(const NameValuePairs &source)
+{
+	AssignFromHelper<RSAFunction>(this, source)
+		CRYPTOPP_SET_FUNCTION_ENTRY(Prime1)
+		CRYPTOPP_SET_FUNCTION_ENTRY(Prime2)
+		CRYPTOPP_SET_FUNCTION_ENTRY(PrivateExponent)
+		CRYPTOPP_SET_FUNCTION_ENTRY(ModPrime1PrivateExponent)
+		CRYPTOPP_SET_FUNCTION_ENTRY(ModPrime2PrivateExponent)
+		CRYPTOPP_SET_FUNCTION_ENTRY(MultiplicativeInverseOfPrime2ModPrime1)
+		;
+}
+
+// *****************************************************************************
+
+Integer RSAFunction_ISO::ApplyFunction(const Integer &x) const
+{
+	Integer t = RSAFunction::ApplyFunction(x);
+	return t % 16 == 12 ? t : m_n - t;
+}
+
+Integer InvertibleRSAFunction_ISO::CalculateInverse(RandomNumberGenerator &rng, const Integer &x) const 
+{
+	Integer t = InvertibleRSAFunction::CalculateInverse(rng, x);
+	return STDMIN(t, m_n-t);
+}
+
+NAMESPACE_END
+
+#endif