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Diffstat (limited to 'modules/eng_ossl/eng_ossl.cpp')
| -rw-r--r-- | modules/eng_ossl/eng_ossl.cpp | 374 |
1 files changed, 374 insertions, 0 deletions
diff --git a/modules/eng_ossl/eng_ossl.cpp b/modules/eng_ossl/eng_ossl.cpp new file mode 100644 index 000000000..9c249876f --- /dev/null +++ b/modules/eng_ossl/eng_ossl.cpp @@ -0,0 +1,374 @@ +/************************************************* +* OpenSSL Engine Source File * +* (C) 1999-2006 The Botan Project * +*************************************************/ + +#include <botan/eng_ossl.h> +#include <botan/bn_wrap.h> +#include <openssl/opensslv.h> + +#if OPENSSL_VERSION_NUMBER < 0x0090700F + #error Your OpenSSL install is too old, upgrade to 0.9.7 or later +#endif + +namespace Botan { + +namespace { + +/************************************************* +* OpenSSL IF Operation * +*************************************************/ +class OpenSSL_IF_Op : public IF_Operation + { + public: + BigInt public_op(const BigInt&) const; + BigInt private_op(const BigInt&) const; + + IF_Operation* clone() const { return new OpenSSL_IF_Op(*this); } + + OpenSSL_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 OSSL_BN e, n, p, q, d1, d2, c; + OSSL_BN_CTX ctx; + }; + +/************************************************* +* OpenSSL IF Public Operation * +*************************************************/ +BigInt OpenSSL_IF_Op::public_op(const BigInt& i_bn) const + { + OSSL_BN i(i_bn), r; + BN_mod_exp(r.value, i.value, e.value, n.value, ctx.value); + return r.to_bigint(); + } + +/************************************************* +* OpenSSL IF Private Operation * +*************************************************/ +BigInt OpenSSL_IF_Op::private_op(const BigInt& i_bn) const + { + if(BN_is_zero(p.value)) + throw Internal_Error("OpenSSL_IF_Op::private_op: No private key"); + + OSSL_BN j1, j2, h(i_bn); + + BN_mod_exp(j1.value, h.value, d1.value, p.value, ctx.value); + BN_mod_exp(j2.value, h.value, d2.value, q.value, ctx.value); + BN_sub(h.value, j1.value, j2.value); + BN_mod_mul(h.value, h.value, c.value, p.value, ctx.value); + BN_mul(h.value, h.value, q.value, ctx.value); + BN_add(h.value, h.value, j2.value); + return h.to_bigint(); + } + +/************************************************* +* OpenSSL DSA Operation * +*************************************************/ +class OpenSSL_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 OpenSSL_DSA_Op(*this); } + + OpenSSL_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 OSSL_BN x, y, p, q, g; + OSSL_BN_CTX ctx; + }; + +/************************************************* +* OpenSSL DSA Verify Operation * +*************************************************/ +bool OpenSSL_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; + + OSSL_BN r(sig, q_bytes); + OSSL_BN s(sig + q_bytes, q_bytes); + OSSL_BN i(msg, msg_len); + + if(BN_is_zero(r.value) || BN_cmp(r.value, q.value) >= 0) + return false; + if(BN_is_zero(s.value) || BN_cmp(s.value, q.value) >= 0) + return false; + + if(BN_mod_inverse(s.value, s.value, q.value, ctx.value) == 0) + return false; + + OSSL_BN si; + BN_mod_mul(si.value, s.value, i.value, q.value, ctx.value); + BN_mod_exp(si.value, g.value, si.value, p.value, ctx.value); + + OSSL_BN sr; + BN_mod_mul(sr.value, s.value, r.value, q.value, ctx.value); + BN_mod_exp(sr.value, y.value, sr.value, p.value, ctx.value); + + BN_mod_mul(si.value, si.value, sr.value, p.value, ctx.value); + BN_nnmod(si.value, si.value, q.value, ctx.value); + + if(BN_cmp(si.value, r.value) == 0) + return true; + return false; + } + +/************************************************* +* OpenSSL DSA Sign Operation * +*************************************************/ +SecureVector<byte> OpenSSL_DSA_Op::sign(const byte in[], u32bit length, + const BigInt& k_bn) const + { + if(BN_is_zero(x.value)) + throw Internal_Error("OpenSSL_DSA_Op::sign: No private key"); + + OSSL_BN i(in, length); + OSSL_BN k(k_bn); + + OSSL_BN r; + BN_mod_exp(r.value, g.value, k.value, p.value, ctx.value); + BN_nnmod(r.value, r.value, q.value, ctx.value); + + BN_mod_inverse(k.value, k.value, q.value, ctx.value); + + OSSL_BN s; + BN_mul(s.value, x.value, r.value, ctx.value); + BN_add(s.value, s.value, i.value); + BN_mod_mul(s.value, s.value, k.value, q.value, ctx.value); + + if(BN_is_zero(r.value) || BN_is_zero(s.value)) + throw Internal_Error("OpenSSL_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; + } + +/************************************************* +* OpenSSL NR Operation * +*************************************************/ +class OpenSSL_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 OpenSSL_NR_Op(*this); } + + OpenSSL_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 OSSL_BN x, y, p, q, g; + OSSL_BN_CTX ctx; + }; + +/************************************************* +* OpenSSL NR Verify Operation * +*************************************************/ +SecureVector<byte> OpenSSL_NR_Op::verify(const byte sig[], + u32bit sig_len) const + { + const u32bit q_bytes = q.bytes(); + + if(sig_len != 2*q_bytes) + return false; + + OSSL_BN c(sig, q_bytes); + OSSL_BN d(sig + q_bytes, q_bytes); + + if(BN_is_zero(c.value) || BN_cmp(c.value, q.value) >= 0 || + BN_cmp(d.value, q.value) >= 0) + throw Invalid_Argument("OpenSSL_NR_Op::verify: Invalid signature"); + + OSSL_BN i1, i2; + BN_mod_exp(i1.value, g.value, d.value, p.value, ctx.value); + BN_mod_exp(i2.value, y.value, c.value, p.value, ctx.value); + BN_mod_mul(i1.value, i1.value, i2.value, p.value, ctx.value); + BN_sub(i1.value, c.value, i1.value); + BN_nnmod(i1.value, i1.value, q.value, ctx.value); + return BigInt::encode(i1.to_bigint()); + } + +/************************************************* +* OpenSSL NR Sign Operation * +*************************************************/ +SecureVector<byte> OpenSSL_NR_Op::sign(const byte in[], u32bit length, + const BigInt& k_bn) const + { + if(BN_is_zero(x.value)) + throw Internal_Error("OpenSSL_NR_Op::sign: No private key"); + + OSSL_BN f(in, length); + OSSL_BN k(k_bn); + + if(BN_cmp(f.value, q.value) >= 0) + throw Invalid_Argument("OpenSSL_NR_Op::sign: Input is out of range"); + + OSSL_BN c, d; + BN_mod_exp(c.value, g.value, k.value, p.value, ctx.value); + BN_add(c.value, c.value, f.value); + BN_nnmod(c.value, c.value, q.value, ctx.value); + BN_mul(d.value, x.value, c.value, ctx.value); + BN_sub(d.value, k.value, d.value); + BN_nnmod(d.value, d.value, q.value, ctx.value); + + if(BN_is_zero(c.value)) + 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; + } + +/************************************************* +* OpenSSL ElGamal Operation * +*************************************************/ +class OpenSSL_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 OpenSSL_ELG_Op(*this); } + OpenSSL_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: + OSSL_BN x, y, g, p; + OSSL_BN_CTX ctx; + }; + +/************************************************* +* OpenSSL ElGamal Encrypt Operation * +*************************************************/ +SecureVector<byte> OpenSSL_ELG_Op::encrypt(const byte in[], u32bit length, + const BigInt& k_bn) const + { + OSSL_BN i(in, length); + + if(BN_cmp(i.value, p.value) >= 0) + throw Invalid_Argument("OpenSSL_ELG_Op: Input is too large"); + + OSSL_BN a, b, k(k_bn); + + BN_mod_exp(a.value, g.value, k.value, p.value, ctx.value); + BN_mod_exp(b.value, y.value, k.value, p.value, ctx.value); + BN_mod_mul(b.value, b.value, i.value, p.value, ctx.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; + } + +/************************************************* +* OpenSSL ElGamal Decrypt Operation * +*************************************************/ +BigInt OpenSSL_ELG_Op::decrypt(const BigInt& a_bn, const BigInt& b_bn) const + { + if(BN_is_zero(x.value)) + throw Internal_Error("OpenSSL_ELG_Op::decrypt: No private key"); + + OSSL_BN a(a_bn), b(b_bn), t; + + if(BN_cmp(a.value, p.value) >= 0 || BN_cmp(b.value, p.value) >= 0) + throw Invalid_Argument("OpenSSL_ELG_Op: Invalid message"); + + BN_mod_exp(t.value, a.value, x.value, p.value, ctx.value); + BN_mod_inverse(a.value, t.value, p.value, ctx.value); + BN_mod_mul(a.value, a.value, b.value, p.value, ctx.value); + return a.to_bigint(); + } + +/************************************************* +* OpenSSL DH Operation * +*************************************************/ +class OpenSSL_DH_Op : public DH_Operation + { + public: + BigInt agree(const BigInt& i) const; + DH_Operation* clone() const { return new OpenSSL_DH_Op(*this); } + + OpenSSL_DH_Op(const DL_Group& group, const BigInt& x_bn) : + x(x_bn), p(group.get_p()) {} + private: + OSSL_BN x, p; + OSSL_BN_CTX ctx; + }; + +/************************************************* +* OpenSSL DH Key Agreement Operation * +*************************************************/ +BigInt OpenSSL_DH_Op::agree(const BigInt& i_bn) const + { + OSSL_BN i(i_bn), r; + BN_mod_exp(r.value, i.value, x.value, p.value, ctx.value); + return r.to_bigint(); + } + +} + +/************************************************* +* Acquire an IF op * +*************************************************/ +IF_Operation* OpenSSL_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 OpenSSL_IF_Op(e, n, d, p, q, d1, d2, c); + } + +/************************************************* +* Acquire a DSA op * +*************************************************/ +DSA_Operation* OpenSSL_Engine::dsa_op(const DL_Group& group, const BigInt& y, + const BigInt& x) const + { + return new OpenSSL_DSA_Op(group, y, x); + } + +/************************************************* +* Acquire a NR op * +*************************************************/ +NR_Operation* OpenSSL_Engine::nr_op(const DL_Group& group, const BigInt& y, + const BigInt& x) const + { + return new OpenSSL_NR_Op(group, y, x); + } + +/************************************************* +* Acquire an ElGamal op * +*************************************************/ +ELG_Operation* OpenSSL_Engine::elg_op(const DL_Group& group, const BigInt& y, + const BigInt& x) const + { + return new OpenSSL_ELG_Op(group, y, x); + } + +/************************************************* +* Acquire a DH op * +*************************************************/ +DH_Operation* OpenSSL_Engine::dh_op(const DL_Group& group, + const BigInt& x) const + { + return new OpenSSL_DH_Op(group, x); + } + +} |