diff options
author | lloyd <[email protected]> | 2008-09-28 19:29:24 +0000 |
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committer | lloyd <[email protected]> | 2008-09-28 19:29:24 +0000 |
commit | 9bcfe627321ddc81691b835dffaa6324ac4684a4 (patch) | |
tree | fe5e8ae9813b853549558b59833022e87e83981b /src/engine/gnump/eng_gmp.cpp | |
parent | 9822a701516396b7de4e41339faecd48ff8dc8ff (diff) |
Move all modules into src/ directory
Diffstat (limited to 'src/engine/gnump/eng_gmp.cpp')
-rw-r--r-- | src/engine/gnump/eng_gmp.cpp | 377 |
1 files changed, 377 insertions, 0 deletions
diff --git a/src/engine/gnump/eng_gmp.cpp b/src/engine/gnump/eng_gmp.cpp new file mode 100644 index 000000000..a0e18e059 --- /dev/null +++ b/src/engine/gnump/eng_gmp.cpp @@ -0,0 +1,377 @@ +/************************************************* +* GMP Engine Source File * +* (C) 1999-2007 Jack Lloyd * +*************************************************/ + +#include <botan/eng_gmp.h> +#include <botan/gmp_wrap.h> +#include <gmp.h> + +namespace Botan { + +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(); + } + +/************************************************* +* 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; + } + +/************************************************* +* GMP NR Operation * +*************************************************/ +class GMP_NR_Op : public NR_Operation + { + public: + SecureVector<byte> verify(const byte[], u32bit) const; + SecureVector<byte> sign(const byte[], u32bit, const BigInt&) const; + + NR_Operation* clone() const { return new GMP_NR_Op(*this); } + + GMP_NR_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 NR Verify Operation * +*************************************************/ +SecureVector<byte> GMP_NR_Op::verify(const byte sig[], u32bit sig_len) const + { + const u32bit q_bytes = q.bytes(); + + if(sig_len != 2*q_bytes) + return false; + + GMP_MPZ c(sig, q_bytes); + GMP_MPZ d(sig + q_bytes, q_bytes); + + if(mpz_cmp_ui(c.value, 0) <= 0 || mpz_cmp(c.value, q.value) >= 0 || + mpz_cmp(d.value, q.value) >= 0) + throw Invalid_Argument("GMP_NR_Op::verify: Invalid signature"); + + GMP_MPZ i1, i2; + mpz_powm(i1.value, g.value, d.value, p.value); + mpz_powm(i2.value, y.value, c.value, p.value); + mpz_mul(i1.value, i1.value, i2.value); + mpz_mod(i1.value, i1.value, p.value); + mpz_sub(i1.value, c.value, i1.value); + mpz_mod(i1.value, i1.value, q.value); + return BigInt::encode(i1.to_bigint()); + } + +/************************************************* +* GMP NR Sign Operation * +*************************************************/ +SecureVector<byte> GMP_NR_Op::sign(const byte in[], u32bit length, + const BigInt& k_bn) const + { + if(mpz_cmp_ui(x.value, 0) == 0) + throw Internal_Error("GMP_NR_Op::sign: No private key"); + + GMP_MPZ f(in, length); + GMP_MPZ k(k_bn); + + if(mpz_cmp(f.value, q.value) >= 0) + throw Invalid_Argument("GMP_NR_Op::sign: Input is out of range"); + + GMP_MPZ c, d; + mpz_powm(c.value, g.value, k.value, p.value); + mpz_add(c.value, c.value, f.value); + mpz_mod(c.value, c.value, q.value); + mpz_mul(d.value, x.value, c.value); + mpz_sub(d.value, k.value, d.value); + mpz_mod(d.value, d.value, q.value); + + if(mpz_cmp_ui(c.value, 0) == 0) + throw Internal_Error("Default_NR_Op::sign: c was zero"); + + const u32bit q_bytes = q.bytes(); + SecureVector<byte> output(2*q_bytes); + c.encode(output, q_bytes); + d.encode(output + q_bytes, q_bytes); + return output; + } + +/************************************************* +* GMP ElGamal Operation * +*************************************************/ +class GMP_ELG_Op : public ELG_Operation + { + public: + SecureVector<byte> encrypt(const byte[], u32bit, const BigInt&) const; + BigInt decrypt(const BigInt&, const BigInt&) const; + + ELG_Operation* clone() const { return new GMP_ELG_Op(*this); } + + GMP_ELG_Op(const DL_Group& group, const BigInt& y1, const BigInt& x1) : + x(x1), y(y1), g(group.get_g()), p(group.get_p()) {} + private: + GMP_MPZ x, y, g, p; + }; + +/************************************************* +* GMP ElGamal Encrypt Operation * +*************************************************/ +SecureVector<byte> GMP_ELG_Op::encrypt(const byte in[], u32bit length, + const BigInt& k_bn) const + { + GMP_MPZ i(in, length); + + if(mpz_cmp(i.value, p.value) >= 0) + throw Invalid_Argument("GMP_ELG_Op: Input is too large"); + + GMP_MPZ a, b, k(k_bn); + + mpz_powm(a.value, g.value, k.value, p.value); + mpz_powm(b.value, y.value, k.value, p.value); + mpz_mul(b.value, b.value, i.value); + mpz_mod(b.value, b.value, p.value); + + const u32bit p_bytes = p.bytes(); + SecureVector<byte> output(2*p_bytes); + a.encode(output, p_bytes); + b.encode(output + p_bytes, p_bytes); + return output; + } + +/************************************************* +* GMP ElGamal Decrypt Operation * +*************************************************/ +BigInt GMP_ELG_Op::decrypt(const BigInt& a_bn, const BigInt& b_bn) const + { + if(mpz_cmp_ui(x.value, 0) == 0) + throw Internal_Error("GMP_ELG_Op::decrypt: No private key"); + + GMP_MPZ a(a_bn), b(b_bn); + + if(mpz_cmp(a.value, p.value) >= 0 || mpz_cmp(b.value, p.value) >= 0) + throw Invalid_Argument("GMP_ELG_Op: Invalid message"); + + mpz_powm(a.value, a.value, x.value, p.value); + mpz_invert(a.value, a.value, p.value); + mpz_mul(a.value, a.value, b.value); + mpz_mod(a.value, a.value, p.value); + return a.to_bigint(); + } + +/************************************************* +* GMP DH Operation * +*************************************************/ +class GMP_DH_Op : public DH_Operation + { + public: + BigInt agree(const BigInt& i) const; + DH_Operation* clone() const { return new GMP_DH_Op(*this); } + + GMP_DH_Op(const DL_Group& group, const BigInt& x_bn) : + x(x_bn), p(group.get_p()) {} + private: + GMP_MPZ x, p; + }; + +/************************************************* +* GMP DH Key Agreement Operation * +*************************************************/ +BigInt GMP_DH_Op::agree(const BigInt& i_bn) const + { + GMP_MPZ i(i_bn); + mpz_powm(i.value, i.value, x.value, p.value); + return i.to_bigint(); + } + +} + +/************************************************* +* GMP_Engine Constructor * +*************************************************/ +GMP_Engine::GMP_Engine() + { + set_memory_hooks(); + } + +/************************************************* +* 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); + } + +/************************************************* +* 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); + } + +/************************************************* +* Acquire a NR op * +*************************************************/ +NR_Operation* GMP_Engine::nr_op(const DL_Group& group, const BigInt& y, + const BigInt& x) const + { + return new GMP_NR_Op(group, y, x); + } + +/************************************************* +* Acquire an ElGamal op * +*************************************************/ +ELG_Operation* GMP_Engine::elg_op(const DL_Group& group, const BigInt& y, + const BigInt& x) const + { + return new GMP_ELG_Op(group, y, x); + } + +/************************************************* +* Acquire a DH op * +*************************************************/ +DH_Operation* GMP_Engine::dh_op(const DL_Group& group, const BigInt& x) const + { + return new GMP_DH_Op(group, x); + } + +} |