diff options
Diffstat (limited to 'src/pubkey/elgamal/elg_core.cpp')
-rw-r--r-- | src/pubkey/elgamal/elg_core.cpp | 93 |
1 files changed, 0 insertions, 93 deletions
diff --git a/src/pubkey/elgamal/elg_core.cpp b/src/pubkey/elgamal/elg_core.cpp deleted file mode 100644 index 0005c4ffc..000000000 --- a/src/pubkey/elgamal/elg_core.cpp +++ /dev/null @@ -1,93 +0,0 @@ -/* -* ElGamal Core -* (C) 1999-2007 Jack Lloyd -* -* Distributed under the terms of the Botan license -*/ - -#include <botan/elg_core.h> -#include <botan/numthry.h> -#include <botan/internal/pk_engine.h> -#include <botan/parsing.h> -#include <algorithm> - -namespace Botan { - -/* -* 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) - { - const u32bit BLINDING_BITS = BOTAN_PRIVATE_KEY_OP_BLINDING_BITS; - - 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))); - } - -} |