From 3438e5d3ddf8444f0e31009ffbe8237ef3752c22 Mon Sep 17 00:00:00 2001 From: Alexander Harkness Date: Sun, 24 Nov 2013 14:21:13 +0000 Subject: move cryptopp into lib --- CryptoPP/ec2n.cpp | 292 ------------------------------------------------------ 1 file changed, 292 deletions(-) delete mode 100644 CryptoPP/ec2n.cpp (limited to 'CryptoPP/ec2n.cpp') diff --git a/CryptoPP/ec2n.cpp b/CryptoPP/ec2n.cpp deleted file mode 100644 index b513b2cb8..000000000 --- a/CryptoPP/ec2n.cpp +++ /dev/null @@ -1,292 +0,0 @@ -// ec2n.cpp - written and placed in the public domain by Wei Dai - -#include "pch.h" - -#ifndef CRYPTOPP_IMPORTS - -#include "ec2n.h" -#include "asn.h" - -#include "algebra.cpp" -#include "eprecomp.cpp" - -NAMESPACE_BEGIN(CryptoPP) - -EC2N::EC2N(BufferedTransformation &bt) - : m_field(BERDecodeGF2NP(bt)) -{ - BERSequenceDecoder seq(bt); - m_field->BERDecodeElement(seq, m_a); - m_field->BERDecodeElement(seq, m_b); - // skip optional seed - if (!seq.EndReached()) - { - SecByteBlock seed; - unsigned int unused; - BERDecodeBitString(seq, seed, unused); - } - seq.MessageEnd(); -} - -void EC2N::DEREncode(BufferedTransformation &bt) const -{ - m_field->DEREncode(bt); - DERSequenceEncoder seq(bt); - m_field->DEREncodeElement(seq, m_a); - m_field->DEREncodeElement(seq, m_b); - seq.MessageEnd(); -} - -bool EC2N::DecodePoint(EC2N::Point &P, const byte *encodedPoint, size_t encodedPointLen) const -{ - StringStore store(encodedPoint, encodedPointLen); - return DecodePoint(P, store, encodedPointLen); -} - -bool EC2N::DecodePoint(EC2N::Point &P, BufferedTransformation &bt, size_t encodedPointLen) const -{ - byte type; - if (encodedPointLen < 1 || !bt.Get(type)) - return false; - - switch (type) - { - case 0: - P.identity = true; - return true; - case 2: - case 3: - { - if (encodedPointLen != EncodedPointSize(true)) - return false; - - P.identity = false; - P.x.Decode(bt, m_field->MaxElementByteLength()); - - if (P.x.IsZero()) - { - P.y = m_field->SquareRoot(m_b); - return true; - } - - FieldElement z = m_field->Square(P.x); - assert(P.x == m_field->SquareRoot(z)); - P.y = m_field->Divide(m_field->Add(m_field->Multiply(z, m_field->Add(P.x, m_a)), m_b), z); - assert(P.x == m_field->Subtract(m_field->Divide(m_field->Subtract(m_field->Multiply(P.y, z), m_b), z), m_a)); - z = m_field->SolveQuadraticEquation(P.y); - assert(m_field->Add(m_field->Square(z), z) == P.y); - z.SetCoefficient(0, type & 1); - - P.y = m_field->Multiply(z, P.x); - return true; - } - case 4: - { - if (encodedPointLen != EncodedPointSize(false)) - return false; - - unsigned int len = m_field->MaxElementByteLength(); - P.identity = false; - P.x.Decode(bt, len); - P.y.Decode(bt, len); - return true; - } - default: - return false; - } -} - -void EC2N::EncodePoint(BufferedTransformation &bt, const Point &P, bool compressed) const -{ - if (P.identity) - NullStore().TransferTo(bt, EncodedPointSize(compressed)); - else if (compressed) - { - bt.Put(2 + (!P.x ? 0 : m_field->Divide(P.y, P.x).GetBit(0))); - P.x.Encode(bt, m_field->MaxElementByteLength()); - } - else - { - unsigned int len = m_field->MaxElementByteLength(); - bt.Put(4); // uncompressed - P.x.Encode(bt, len); - P.y.Encode(bt, len); - } -} - -void EC2N::EncodePoint(byte *encodedPoint, const Point &P, bool compressed) const -{ - ArraySink sink(encodedPoint, EncodedPointSize(compressed)); - EncodePoint(sink, P, compressed); - assert(sink.TotalPutLength() == EncodedPointSize(compressed)); -} - -EC2N::Point EC2N::BERDecodePoint(BufferedTransformation &bt) const -{ - SecByteBlock str; - BERDecodeOctetString(bt, str); - Point P; - if (!DecodePoint(P, str, str.size())) - BERDecodeError(); - return P; -} - -void EC2N::DEREncodePoint(BufferedTransformation &bt, const Point &P, bool compressed) const -{ - SecByteBlock str(EncodedPointSize(compressed)); - EncodePoint(str, P, compressed); - DEREncodeOctetString(bt, str); -} - -bool EC2N::ValidateParameters(RandomNumberGenerator &rng, unsigned int level) const -{ - bool pass = !!m_b; - pass = pass && m_a.CoefficientCount() <= m_field->MaxElementBitLength(); - pass = pass && m_b.CoefficientCount() <= m_field->MaxElementBitLength(); - - if (level >= 1) - pass = pass && m_field->GetModulus().IsIrreducible(); - - return pass; -} - -bool EC2N::VerifyPoint(const Point &P) const -{ - const FieldElement &x = P.x, &y = P.y; - return P.identity || - (x.CoefficientCount() <= m_field->MaxElementBitLength() - && y.CoefficientCount() <= m_field->MaxElementBitLength() - && !(((x+m_a)*x*x+m_b-(x+y)*y)%m_field->GetModulus())); -} - -bool EC2N::Equal(const Point &P, const Point &Q) const -{ - if (P.identity && Q.identity) - return true; - - if (P.identity && !Q.identity) - return false; - - if (!P.identity && Q.identity) - return false; - - return (m_field->Equal(P.x,Q.x) && m_field->Equal(P.y,Q.y)); -} - -const EC2N::Point& EC2N::Identity() const -{ - return Singleton().Ref(); -} - -const EC2N::Point& EC2N::Inverse(const Point &P) const -{ - if (P.identity) - return P; - else - { - m_R.identity = false; - m_R.y = m_field->Add(P.x, P.y); - m_R.x = P.x; - return m_R; - } -} - -const EC2N::Point& EC2N::Add(const Point &P, const Point &Q) const -{ - if (P.identity) return Q; - if (Q.identity) return P; - if (Equal(P, Q)) return Double(P); - if (m_field->Equal(P.x, Q.x) && m_field->Equal(P.y, m_field->Add(Q.x, Q.y))) return Identity(); - - FieldElement t = m_field->Add(P.y, Q.y); - t = m_field->Divide(t, m_field->Add(P.x, Q.x)); - FieldElement x = m_field->Square(t); - m_field->Accumulate(x, t); - m_field->Accumulate(x, Q.x); - m_field->Accumulate(x, m_a); - m_R.y = m_field->Add(P.y, m_field->Multiply(t, x)); - m_field->Accumulate(x, P.x); - m_field->Accumulate(m_R.y, x); - - m_R.x.swap(x); - m_R.identity = false; - return m_R; -} - -const EC2N::Point& EC2N::Double(const Point &P) const -{ - if (P.identity) return P; - if (!m_field->IsUnit(P.x)) return Identity(); - - FieldElement t = m_field->Divide(P.y, P.x); - m_field->Accumulate(t, P.x); - m_R.y = m_field->Square(P.x); - m_R.x = m_field->Square(t); - m_field->Accumulate(m_R.x, t); - m_field->Accumulate(m_R.x, m_a); - m_field->Accumulate(m_R.y, m_field->Multiply(t, m_R.x)); - m_field->Accumulate(m_R.y, m_R.x); - - m_R.identity = false; - return m_R; -} - -// ******************************************************** - -/* -EcPrecomputation& EcPrecomputation::operator=(const EcPrecomputation &rhs) -{ - m_ec = rhs.m_ec; - m_ep = rhs.m_ep; - m_ep.m_group = m_ec.get(); - return *this; -} - -void EcPrecomputation::SetCurveAndBase(const EC2N &ec, const EC2N::Point &base) -{ - m_ec.reset(new EC2N(ec)); - m_ep.SetGroupAndBase(*m_ec, base); -} - -void EcPrecomputation::Precompute(unsigned int maxExpBits, unsigned int storage) -{ - m_ep.Precompute(maxExpBits, storage); -} - -void EcPrecomputation::Load(BufferedTransformation &bt) -{ - BERSequenceDecoder seq(bt); - word32 version; - BERDecodeUnsigned(seq, version, INTEGER, 1, 1); - m_ep.m_exponentBase.BERDecode(seq); - m_ep.m_windowSize = m_ep.m_exponentBase.BitCount() - 1; - m_ep.m_bases.clear(); - while (!seq.EndReached()) - m_ep.m_bases.push_back(m_ec->BERDecodePoint(seq)); - seq.MessageEnd(); -} - -void EcPrecomputation::Save(BufferedTransformation &bt) const -{ - DERSequenceEncoder seq(bt); - DEREncodeUnsigned(seq, 1); // version - m_ep.m_exponentBase.DEREncode(seq); - for (unsigned i=0; iDEREncodePoint(seq, m_ep.m_bases[i]); - seq.MessageEnd(); -} - -EC2N::Point EcPrecomputation::Exponentiate(const Integer &exponent) const -{ - return m_ep.Exponentiate(exponent); -} - -EC2N::Point EcPrecomputation::CascadeExponentiate(const Integer &exponent, const DL_FixedBasePrecomputation &pc2, const Integer &exponent2) const -{ - return m_ep.CascadeExponentiate(exponent, static_cast &>(pc2).m_ep, exponent2); -} -*/ - -NAMESPACE_END - -#endif -- cgit v1.2.3