/************************************************* * PK Algorithm Core Source File * * (C) 1999-2007 Jack Lloyd * *************************************************/ #include <botan/pk_core.h> #include <botan/numthry.h> #include <botan/engine.h> #include <botan/parsing.h> #include <algorithm> namespace Botan { namespace { const u32bit BLINDING_BITS = BOTAN_PRIVATE_KEY_OP_BLINDING_BITS; } /************************************************* * IF_Core Constructor * *************************************************/ IF_Core::IF_Core(const BigInt& e, const BigInt& n) { op = Engine_Core::if_op(e, n, 0, 0, 0, 0, 0, 0); } /************************************************* * IF_Core Constructor * *************************************************/ IF_Core::IF_Core(RandomNumberGenerator& rng, const BigInt& e, const BigInt& n, const BigInt& d, const BigInt& p, const BigInt& q, const BigInt& d1, const BigInt& d2, const BigInt& c) { op = Engine_Core::if_op(e, n, d, p, q, d1, d2, c); if(BLINDING_BITS) { BigInt k(rng, std::min(n.bits()-1, BLINDING_BITS)); blinder = Blinder(power_mod(k, e, n), inverse_mod(k, n), n); } } /************************************************* * IF_Core Copy Constructor * *************************************************/ IF_Core::IF_Core(const IF_Core& core) { op = 0; if(core.op) op = core.op->clone(); blinder = core.blinder; } /************************************************* * IF_Core Assignment Operator * *************************************************/ IF_Core& IF_Core::operator=(const IF_Core& core) { delete op; if(core.op) op = core.op->clone(); blinder = core.blinder; return (*this); } /************************************************* * IF Public Operation * *************************************************/ BigInt IF_Core::public_op(const BigInt& i) const { return op->public_op(i); } /************************************************* * IF Private Operation * *************************************************/ BigInt IF_Core::private_op(const BigInt& i) const { return blinder.unblind(op->private_op(blinder.blind(i))); } /************************************************* * DSA_Core Constructor * *************************************************/ DSA_Core::DSA_Core(const DL_Group& group, const BigInt& y, const BigInt& x) { op = Engine_Core::dsa_op(group, y, x); } /************************************************* * DSA_Core Copy Constructor * *************************************************/ DSA_Core::DSA_Core(const DSA_Core& core) { op = 0; if(core.op) op = core.op->clone(); } /************************************************* * DSA_Core Assignment Operator * *************************************************/ DSA_Core& DSA_Core::operator=(const DSA_Core& core) { delete op; if(core.op) op = core.op->clone(); return (*this); } /************************************************* * DSA Verification Operation * *************************************************/ bool DSA_Core::verify(const byte msg[], u32bit msg_length, const byte sig[], u32bit sig_length) const { return op->verify(msg, msg_length, sig, sig_length); } /************************************************* * DSA Signature Operation * *************************************************/ SecureVector<byte> DSA_Core::sign(const byte in[], u32bit length, const BigInt& k) const { return op->sign(in, length, k); } /************************************************* * NR_Core Constructor * *************************************************/ NR_Core::NR_Core(const DL_Group& group, const BigInt& y, const BigInt& x) { op = Engine_Core::nr_op(group, y, x); } /************************************************* * NR_Core Copy Constructor * *************************************************/ NR_Core::NR_Core(const NR_Core& core) { op = 0; if(core.op) op = core.op->clone(); } /************************************************* * NR_Core Assignment Operator * *************************************************/ NR_Core& NR_Core::operator=(const NR_Core& core) { delete op; if(core.op) op = core.op->clone(); return (*this); } /************************************************* * NR Verification Operation * *************************************************/ SecureVector<byte> NR_Core::verify(const byte in[], u32bit length) const { return op->verify(in, length); } /************************************************* * NR Signature Operation * *************************************************/ SecureVector<byte> NR_Core::sign(const byte in[], u32bit length, const BigInt& k) const { return op->sign(in, length, k); } /************************************************* * ELG_Core Constructor * *************************************************/ ELG_Core::ELG_Core(const DL_Group& group, const BigInt& y) { op = Engine_Core::elg_op(group, y, 0); p_bytes = 0; } /************************************************* * ELG_Core Constructor * *************************************************/ ELG_Core::ELG_Core(RandomNumberGenerator& rng, const DL_Group& group, const BigInt& y, const BigInt& x) { op = Engine_Core::elg_op(group, y, x); const BigInt& p = group.get_p(); p_bytes = p.bytes(); if(BLINDING_BITS) { BigInt k(rng, std::min(p.bits()-1, BLINDING_BITS)); blinder = Blinder(k, power_mod(k, x, p), p); } } /************************************************* * ELG_Core Copy Constructor * *************************************************/ ELG_Core::ELG_Core(const ELG_Core& core) { op = 0; if(core.op) op = core.op->clone(); blinder = core.blinder; p_bytes = core.p_bytes; } /************************************************* * ELG_Core Assignment Operator * *************************************************/ ELG_Core& ELG_Core::operator=(const ELG_Core& core) { delete op; if(core.op) op = core.op->clone(); blinder = core.blinder; p_bytes = core.p_bytes; return (*this); } /************************************************* * ElGamal Encrypt Operation * *************************************************/ SecureVector<byte> ELG_Core::encrypt(const byte in[], u32bit length, const BigInt& k) const { return op->encrypt(in, length, k); } /************************************************* * ElGamal Decrypt Operation * *************************************************/ SecureVector<byte> ELG_Core::decrypt(const byte in[], u32bit length) const { if(length != 2*p_bytes) throw Invalid_Argument("ELG_Core::decrypt: Invalid message"); BigInt a(in, p_bytes); BigInt b(in + p_bytes, p_bytes); return BigInt::encode(blinder.unblind(op->decrypt(blinder.blind(a), b))); } /************************************************* * DH_Core Constructor * *************************************************/ DH_Core::DH_Core(RandomNumberGenerator& rng, const DL_Group& group, const BigInt& x) { op = Engine_Core::dh_op(group, x); const BigInt& p = group.get_p(); BigInt k(rng, std::min(p.bits()-1, BLINDING_BITS)); if(k != 0) blinder = Blinder(k, power_mod(inverse_mod(k, p), x, p), p); } /************************************************* * DH_Core Copy Constructor * *************************************************/ DH_Core::DH_Core(const DH_Core& core) { op = 0; if(core.op) op = core.op->clone(); blinder = core.blinder; } /************************************************* * DH_Core Assignment Operator * *************************************************/ DH_Core& DH_Core::operator=(const DH_Core& core) { delete op; if(core.op) op = core.op->clone(); blinder = core.blinder; return (*this); } /************************************************* * DH Operation * *************************************************/ BigInt DH_Core::agree(const BigInt& i) const { return blinder.unblind(op->agree(blinder.blind(i))); } }