diff options
Diffstat (limited to 'src/libstate/engine/gnump/gmp_dsa.cpp')
-rw-r--r-- | src/libstate/engine/gnump/gmp_dsa.cpp | 122 |
1 files changed, 0 insertions, 122 deletions
diff --git a/src/libstate/engine/gnump/gmp_dsa.cpp b/src/libstate/engine/gnump/gmp_dsa.cpp deleted file mode 100644 index 209c6e0a6..000000000 --- a/src/libstate/engine/gnump/gmp_dsa.cpp +++ /dev/null @@ -1,122 +0,0 @@ -/************************************************* -* GMP DSA Engine Source File * -* (C) 1999-2007 Jack Lloyd * -*************************************************/ - -#include <botan/eng_gmp.h> -#include <botan/gmp_wrap.h> -#include <gmp.h> - -namespace Botan { - -#if defined(BOTAN_HAS_DSA) - -namespace { - -/************************************************* -* GMP DSA Operation * -*************************************************/ -class GMP_DSA_Op : public DSA_Operation - { - public: - bool verify(const byte[], u32bit, const byte[], u32bit) const; - SecureVector<byte> sign(const byte[], u32bit, const BigInt&) const; - - DSA_Operation* clone() const { return new GMP_DSA_Op(*this); } - - GMP_DSA_Op(const DL_Group& group, const BigInt& y1, const BigInt& x1) : - x(x1), y(y1), p(group.get_p()), q(group.get_q()), g(group.get_g()) {} - private: - const GMP_MPZ x, y, p, q, g; - }; - -/************************************************* -* GMP DSA Verify Operation * -*************************************************/ -bool GMP_DSA_Op::verify(const byte msg[], u32bit msg_len, - const byte sig[], u32bit sig_len) const - { - const u32bit q_bytes = q.bytes(); - - if(sig_len != 2*q_bytes || msg_len > q_bytes) - return false; - - GMP_MPZ r(sig, q_bytes); - GMP_MPZ s(sig + q_bytes, q_bytes); - GMP_MPZ i(msg, msg_len); - - if(mpz_cmp_ui(r.value, 0) <= 0 || mpz_cmp(r.value, q.value) >= 0) - return false; - if(mpz_cmp_ui(s.value, 0) <= 0 || mpz_cmp(s.value, q.value) >= 0) - return false; - - if(mpz_invert(s.value, s.value, q.value) == 0) - return false; - - GMP_MPZ si; - mpz_mul(si.value, s.value, i.value); - mpz_mod(si.value, si.value, q.value); - mpz_powm(si.value, g.value, si.value, p.value); - - GMP_MPZ sr; - mpz_mul(sr.value, s.value, r.value); - mpz_mod(sr.value, sr.value, q.value); - mpz_powm(sr.value, y.value, sr.value, p.value); - - mpz_mul(si.value, si.value, sr.value); - mpz_mod(si.value, si.value, p.value); - mpz_mod(si.value, si.value, q.value); - - if(mpz_cmp(si.value, r.value) == 0) - return true; - return false; - } - -/************************************************* -* GMP DSA Sign Operation * -*************************************************/ -SecureVector<byte> GMP_DSA_Op::sign(const byte in[], u32bit length, - const BigInt& k_bn) const - { - if(mpz_cmp_ui(x.value, 0) == 0) - throw Internal_Error("GMP_DSA_Op::sign: No private key"); - - GMP_MPZ i(in, length); - GMP_MPZ k(k_bn); - - GMP_MPZ r; - mpz_powm(r.value, g.value, k.value, p.value); - mpz_mod(r.value, r.value, q.value); - - mpz_invert(k.value, k.value, q.value); - - GMP_MPZ s; - mpz_mul(s.value, x.value, r.value); - mpz_add(s.value, s.value, i.value); - mpz_mul(s.value, s.value, k.value); - mpz_mod(s.value, s.value, q.value); - - if(mpz_cmp_ui(r.value, 0) == 0 || mpz_cmp_ui(s.value, 0) == 0) - throw Internal_Error("GMP_DSA_Op::sign: r or s was zero"); - - const u32bit q_bytes = q.bytes(); - - SecureVector<byte> output(2*q_bytes); - r.encode(output, q_bytes); - s.encode(output + q_bytes, q_bytes); - return output; - } - -} - -/************************************************* -* Acquire a DSA op * -*************************************************/ -DSA_Operation* GMP_Engine::dsa_op(const DL_Group& group, const BigInt& y, - const BigInt& x) const - { - return new GMP_DSA_Op(group, y, x); - } -#endif - -} |