diff options
Diffstat (limited to 'old/botan/src/engine/gnump/gmp_if.cpp')
-rw-r--r-- | old/botan/src/engine/gnump/gmp_if.cpp | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/old/botan/src/engine/gnump/gmp_if.cpp b/old/botan/src/engine/gnump/gmp_if.cpp new file mode 100644 index 0000000..b96f2dd --- /dev/null +++ b/old/botan/src/engine/gnump/gmp_if.cpp @@ -0,0 +1,81 @@ +/* +* GMP IF Engine +* (C) 1999-2007 Jack Lloyd +* +* Distributed under the terms of the Botan license +*/ + +#include <botan/eng_gmp.h> +#include <botan/gmp_wrap.h> +#include <gmp.h> + +namespace Botan { + +#if defined(BOTAN_HAS_IF_PUBLIC_KEY_FAMILY) + +namespace { + +/* +* GMP IF Operation +*/ +class GMP_IF_Op : public IF_Operation + { + public: + BigInt public_op(const BigInt&) const; + BigInt private_op(const BigInt&) const; + + IF_Operation* clone() const { return new GMP_IF_Op(*this); } + + GMP_IF_Op(const BigInt& e_bn, const BigInt& n_bn, const BigInt&, + const BigInt& p_bn, const BigInt& q_bn, const BigInt& d1_bn, + const BigInt& d2_bn, const BigInt& c_bn) : + e(e_bn), n(n_bn), p(p_bn), q(q_bn), d1(d1_bn), d2(d2_bn), c(c_bn) {} + private: + const GMP_MPZ e, n, p, q, d1, d2, c; + }; + +/* +* GMP IF Public Operation +*/ +BigInt GMP_IF_Op::public_op(const BigInt& i_bn) const + { + GMP_MPZ i(i_bn); + mpz_powm(i.value, i.value, e.value, n.value); + return i.to_bigint(); + } + +/* +* GMP IF Private Operation +*/ +BigInt GMP_IF_Op::private_op(const BigInt& i_bn) const + { + if(mpz_cmp_ui(p.value, 0) == 0) + throw Internal_Error("GMP_IF_Op::private_op: No private key"); + + GMP_MPZ j1, j2, h(i_bn); + + mpz_powm(j1.value, h.value, d1.value, p.value); + mpz_powm(j2.value, h.value, d2.value, q.value); + mpz_sub(h.value, j1.value, j2.value); + mpz_mul(h.value, h.value, c.value); + mpz_mod(h.value, h.value, p.value); + mpz_mul(h.value, h.value, q.value); + mpz_add(h.value, h.value, j2.value); + return h.to_bigint(); + } + +} + +/* +* Acquire an IF op +*/ +IF_Operation* GMP_Engine::if_op(const BigInt& e, const BigInt& n, + const BigInt& d, const BigInt& p, + const BigInt& q, const BigInt& d1, + const BigInt& d2, const BigInt& c) const + { + return new GMP_IF_Op(e, n, d, p, q, d1, d2, c); + } +#endif + +} |