diff options
Diffstat (limited to 'src/pk_core.cpp')
| -rw-r--r-- | src/pk_core.cpp | 289 |
1 files changed, 289 insertions, 0 deletions
diff --git a/src/pk_core.cpp b/src/pk_core.cpp new file mode 100644 index 000000000..72bc475fa --- /dev/null +++ b/src/pk_core.cpp @@ -0,0 +1,289 @@ +/************************************************* +* PK Algorithm Core Source File * +* (C) 1999-2006 The Botan Project * +*************************************************/ + +#include <botan/pk_core.h> +#include <botan/numthry.h> +#include <botan/engine.h> +#include <botan/conf.h> +#include <algorithm> + +namespace Botan { + +namespace { + +/************************************************* +* Return a new blinding factor * +*************************************************/ +BigInt blinding_factor(u32bit modulus_size) + { + const u32bit BLINDING_BITS = Config::get_u32bit("pk/blinder_size"); + if(BLINDING_BITS == 0) + return 0; + return random_integer(std::min(modulus_size - 1, BLINDING_BITS)); + } + +} + +/************************************************* +* IF_Core Constructor * +*************************************************/ +IF_Core::IF_Core(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(d != 0) + { + BigInt k = blinding_factor(n.bits()); + if(k != 0) + 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, const BigInt& x) + { + op = Engine_Core::elg_op(group, y, x); + + p_bytes = 0; + if(x != 0) + { + const BigInt& p = group.get_p(); + p_bytes = group.get_p().bytes(); + + BigInt k = blinding_factor(p.bits()); + if(k != 0) + 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(const DL_Group& group, const BigInt& x) + { + op = Engine_Core::dh_op(group, x); + + const BigInt& p = group.get_p(); + BigInt k = blinding_factor(p.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))); + } + +} |