/************************************************* * Nyberg-Rueppel Source File * * (C) 1999-2007 The Botan Project * *************************************************/ #include <botan/nr.h> #include <botan/numthry.h> #include <botan/keypair.h> namespace Botan { /************************************************* * NR_PublicKey Constructor * *************************************************/ NR_PublicKey::NR_PublicKey(const DL_Group& grp, const BigInt& y1) { group = grp; y = y1; X509_load_hook(); } /************************************************* * Algorithm Specific X.509 Initialization Code * *************************************************/ void NR_PublicKey::X509_load_hook() { core = NR_Core(group, y); load_check(); } /************************************************* * Nyberg-Rueppel Verification Function * *************************************************/ SecureVector<byte> NR_PublicKey::verify(const byte sig[], u32bit sig_len) const { return core.verify(sig, sig_len); } /************************************************* * Return the maximum input size in bits * *************************************************/ u32bit NR_PublicKey::max_input_bits() const { return (group_q().bits() - 1); } /************************************************* * Return the size of each portion of the sig * *************************************************/ u32bit NR_PublicKey::message_part_size() const { return group_q().bytes(); } /************************************************* * Create a NR private key * *************************************************/ NR_PrivateKey::NR_PrivateKey(const DL_Group& grp) { group = grp; x = random_integer(2, group_q() - 1); PKCS8_load_hook(true); } /************************************************* * NR_PrivateKey Constructor * *************************************************/ NR_PrivateKey::NR_PrivateKey(const DL_Group& grp, const BigInt& x1, const BigInt& y1) { group = grp; y = y1; x = x1; PKCS8_load_hook(); } /************************************************* * Algorithm Specific PKCS #8 Initialization Code * *************************************************/ void NR_PrivateKey::PKCS8_load_hook(bool generated) { if(y == 0) y = power_mod(group_g(), x, group_p()); core = NR_Core(group, y, x); if(generated) gen_check(); else load_check(); } /************************************************* * Nyberg-Rueppel Signature Operation * *************************************************/ SecureVector<byte> NR_PrivateKey::sign(const byte in[], u32bit length) const { const BigInt& q = group_q(); BigInt k; do k.randomize(q.bits()); while(k >= q); return core.sign(in, length, k); } /************************************************* * Check Private Nyberg-Rueppel Parameters * *************************************************/ bool NR_PrivateKey::check_key(bool strong) const { if(!DL_Scheme_PrivateKey::check_key(strong) || x >= group_q()) return false; if(!strong) return true; try { KeyPair::check_key(get_pk_signer(*this, "EMSA1(SHA-1)"), get_pk_verifier(*this, "EMSA1(SHA-1)") ); } catch(Self_Test_Failure) { return false; } return true; } }