1 files changed, 338 insertions, 0 deletions
diff --git a/src/lib/engine/openssl/ossl_pk.cpp b/src/lib/engine/openssl/ossl_pk.cpp
new file mode 100644
index 000000000..cbe03d7b3
--- /dev/null
+++ b/src/lib/engine/openssl/ossl_pk.cpp
@@ -0,0 +1,338 @@
+/*
+* OpenSSL PK operations
+* (C) 1999-2010 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#include <botan/internal/openssl_engine.h>
+#include <botan/internal/bn_wrap.h>
+
+#if defined(BOTAN_HAS_RSA)
+  #include <botan/rsa.h>
+#endif
+
+#if defined(BOTAN_HAS_DSA)
+  #include <botan/dsa.h>
+#endif
+
+#if defined(BOTAN_HAS_ECDSA)
+  #include <botan/ecdsa.h>
+  #include <openssl/ecdsa.h>
+#endif
+
+#if defined(BOTAN_HAS_DIFFIE_HELLMAN)
+  #include <botan/dh.h>
+#endif
+
+namespace Botan {
+
+namespace {
+
+#if defined(BOTAN_HAS_DIFFIE_HELLMAN)
+class OSSL_DH_KA_Operation : public PK_Ops::Key_Agreement
+   {
+   public:
+      OSSL_DH_KA_Operation(const DH_PrivateKey& dh) :
+         x(dh.get_x()), p(dh.group_p()) {}
+
+      secure_vector<byte> agree(const byte w[], size_t w_len)
+         {
+         OSSL_BN i(w, w_len), r;
+         BN_mod_exp(r.ptr(), i.ptr(), x.ptr(), p.ptr(), ctx.ptr());
+         return r.to_bytes();
+         }
+
+   private:
+      const OSSL_BN x, p;
+      OSSL_BN_CTX ctx;
+   };
+#endif
+
+#if defined(BOTAN_HAS_DSA)
+
+class OSSL_DSA_Signature_Operation : public PK_Ops::Signature
+   {
+   public:
+      OSSL_DSA_Signature_Operation(const DSA_PrivateKey& dsa) :
+         x(dsa.get_x()),
+         p(dsa.group_p()),
+         q(dsa.group_q()),
+         g(dsa.group_g()),
+         q_bits(dsa.group_q().bits()) {}
+
+      size_t message_parts() const { return 2; }
+      size_t message_part_size() const { return (q_bits + 7) / 8; }
+      size_t max_input_bits() const { return q_bits; }
+
+      secure_vector<byte> sign(const byte msg[], size_t msg_len,
+                              RandomNumberGenerator& rng);
+   private:
+      const OSSL_BN x, p, q, g;
+      const OSSL_BN_CTX ctx;
+      size_t q_bits;
+   };
+
+secure_vector<byte>
+OSSL_DSA_Signature_Operation::sign(const byte msg[], size_t msg_len,
+                                  RandomNumberGenerator& rng)
+   {
+   const size_t q_bytes = (q_bits + 7) / 8;
+
+   rng.add_entropy(msg, msg_len);
+
+   BigInt k_bn;
+   do
+      k_bn.randomize(rng, q_bits);
+   while(k_bn >= q.to_bigint());
+
+   OSSL_BN i(msg, msg_len);
+   OSSL_BN k(k_bn);
+
+   OSSL_BN r;
+   BN_mod_exp(r.ptr(), g.ptr(), k.ptr(), p.ptr(), ctx.ptr());
+   BN_nnmod(r.ptr(), r.ptr(), q.ptr(), ctx.ptr());
+
+   BN_mod_inverse(k.ptr(), k.ptr(), q.ptr(), ctx.ptr());
+
+   OSSL_BN s;
+   BN_mul(s.ptr(), x.ptr(), r.ptr(), ctx.ptr());
+   BN_add(s.ptr(), s.ptr(), i.ptr());
+   BN_mod_mul(s.ptr(), s.ptr(), k.ptr(), q.ptr(), ctx.ptr());
+
+   if(BN_is_zero(r.ptr()) || BN_is_zero(s.ptr()))
+      throw Internal_Error("OpenSSL_DSA_Op::sign: r or s was zero");
+
+   secure_vector<byte> output(2*q_bytes);
+   r.encode(&output[0], q_bytes);
+   s.encode(&output[q_bytes], q_bytes);
+   return output;
+   }
+
+class OSSL_DSA_Verification_Operation : public PK_Ops::Verification
+   {
+   public:
+      OSSL_DSA_Verification_Operation(const DSA_PublicKey& dsa) :
+         y(dsa.get_y()),
+         p(dsa.group_p()),
+         q(dsa.group_q()),
+         g(dsa.group_g()),
+         q_bits(dsa.group_q().bits()) {}
+
+      size_t message_parts() const { return 2; }
+      size_t message_part_size() const { return (q_bits + 7) / 8; }
+      size_t max_input_bits() const { return q_bits; }
+
+      bool with_recovery() const { return false; }
+
+      bool verify(const byte msg[], size_t msg_len,
+                  const byte sig[], size_t sig_len);
+   private:
+      const OSSL_BN y, p, q, g;
+      const OSSL_BN_CTX ctx;
+      size_t q_bits;
+   };
+
+bool OSSL_DSA_Verification_Operation::verify(const byte msg[], size_t msg_len,
+                                            const byte sig[], size_t sig_len)
+   {
+   const size_t 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.ptr()) || BN_cmp(r.ptr(), q.ptr()) >= 0)
+      return false;
+   if(BN_is_zero(s.ptr()) || BN_cmp(s.ptr(), q.ptr()) >= 0)
+      return false;
+
+   if(BN_mod_inverse(s.ptr(), s.ptr(), q.ptr(), ctx.ptr()) == 0)
+      return false;
+
+   OSSL_BN si;
+   BN_mod_mul(si.ptr(), s.ptr(), i.ptr(), q.ptr(), ctx.ptr());
+   BN_mod_exp(si.ptr(), g.ptr(), si.ptr(), p.ptr(), ctx.ptr());
+
+   OSSL_BN sr;
+   BN_mod_mul(sr.ptr(), s.ptr(), r.ptr(), q.ptr(), ctx.ptr());
+   BN_mod_exp(sr.ptr(), y.ptr(), sr.ptr(), p.ptr(), ctx.ptr());
+
+   BN_mod_mul(si.ptr(), si.ptr(), sr.ptr(), p.ptr(), ctx.ptr());
+   BN_nnmod(si.ptr(), si.ptr(), q.ptr(), ctx.ptr());
+
+   if(BN_cmp(si.ptr(), r.ptr()) == 0)
+      return true;
+   return false;
+
+   return false;
+   }
+
+#endif
+
+#if defined(BOTAN_HAS_RSA)
+
+class OSSL_RSA_Private_Operation : public PK_Ops::Signature,
+                                   public PK_Ops::Decryption
+   {
+   public:
+      OSSL_RSA_Private_Operation(const RSA_PrivateKey& rsa) :
+         mod(rsa.get_n()),
+         p(rsa.get_p()),
+         q(rsa.get_q()),
+         d1(rsa.get_d1()),
+         d2(rsa.get_d2()),
+         c(rsa.get_c()),
+         n_bits(rsa.get_n().bits())
+         {}
+
+      size_t max_input_bits() const { return (n_bits - 1); }
+
+      secure_vector<byte> sign(const byte msg[], size_t msg_len,
+                              RandomNumberGenerator&)
+         {
+         BigInt m(msg, msg_len);
+         BigInt x = private_op(m);
+         return BigInt::encode_1363(x, (n_bits + 7) / 8);
+         }
+
+      secure_vector<byte> decrypt(const byte msg[], size_t msg_len)
+         {
+         BigInt m(msg, msg_len);
+         return BigInt::encode_locked(private_op(m));
+         }
+
+   private:
+      BigInt private_op(const BigInt& m) const;
+
+      const OSSL_BN mod, p, q, d1, d2, c;
+      const OSSL_BN_CTX ctx;
+      size_t n_bits;
+   };
+
+BigInt OSSL_RSA_Private_Operation::private_op(const BigInt& m) const
+   {
+   OSSL_BN j1, j2, h(m);
+
+   BN_mod_exp(j1.ptr(), h.ptr(), d1.ptr(), p.ptr(), ctx.ptr());
+   BN_mod_exp(j2.ptr(), h.ptr(), d2.ptr(), q.ptr(), ctx.ptr());
+   BN_sub(h.ptr(), j1.ptr(), j2.ptr());
+   BN_mod_mul(h.ptr(), h.ptr(), c.ptr(), p.ptr(), ctx.ptr());
+   BN_mul(h.ptr(), h.ptr(), q.ptr(), ctx.ptr());
+   BN_add(h.ptr(), h.ptr(), j2.ptr());
+   return h.to_bigint();
+   }
+
+class OSSL_RSA_Public_Operation : public PK_Ops::Verification,
+                                  public PK_Ops::Encryption
+   {
+   public:
+      OSSL_RSA_Public_Operation(const RSA_PublicKey& rsa) :
+         n(rsa.get_n()), e(rsa.get_e()), mod(rsa.get_n())
+         {}
+
+      size_t max_input_bits() const { return (n.bits() - 1); }
+      bool with_recovery() const { return true; }
+
+      secure_vector<byte> encrypt(const byte msg[], size_t msg_len,
+                                 RandomNumberGenerator&)
+         {
+         BigInt m(msg, msg_len);
+         return BigInt::encode_1363(public_op(m), n.bytes());
+         }
+
+      secure_vector<byte> verify_mr(const byte msg[], size_t msg_len)
+         {
+         BigInt m(msg, msg_len);
+         return BigInt::encode_locked(public_op(m));
+         }
+
+   private:
+      BigInt public_op(const BigInt& m) const
+         {
+         if(m >= n)
+            throw Invalid_Argument("RSA public op - input is too large");
+
+         OSSL_BN m_bn(m), r;
+         BN_mod_exp(r.ptr(), m_bn.ptr(), e.ptr(), mod.ptr(), ctx.ptr());
+         return r.to_bigint();
+         }
+
+      const BigInt& n;
+      const OSSL_BN e, mod;
+      const OSSL_BN_CTX ctx;
+   };
+
+#endif
+
+}
+
+PK_Ops::Key_Agreement*
+OpenSSL_Engine::get_key_agreement_op(const Private_Key& key, RandomNumberGenerator&) const
+   {
+#if defined(BOTAN_HAS_DIFFIE_HELLMAN)
+   if(const DH_PrivateKey* dh = dynamic_cast<const DH_PrivateKey*>(&key))
+      return new OSSL_DH_KA_Operation(*dh);
+#endif
+
+   return 0;
+   }
+
+PK_Ops::Signature*
+OpenSSL_Engine::get_signature_op(const Private_Key& key, RandomNumberGenerator&) const
+   {
+#if defined(BOTAN_HAS_RSA)
+   if(const RSA_PrivateKey* s = dynamic_cast<const RSA_PrivateKey*>(&key))
+      return new OSSL_RSA_Private_Operation(*s);
+#endif
+
+#if defined(BOTAN_HAS_DSA)
+   if(const DSA_PrivateKey* s = dynamic_cast<const DSA_PrivateKey*>(&key))
+      return new OSSL_DSA_Signature_Operation(*s);
+#endif
+
+   return 0;
+   }
+
+PK_Ops::Verification*
+OpenSSL_Engine::get_verify_op(const Public_Key& key, RandomNumberGenerator&) const
+   {
+#if defined(BOTAN_HAS_RSA)
+   if(const RSA_PublicKey* s = dynamic_cast<const RSA_PublicKey*>(&key))
+      return new OSSL_RSA_Public_Operation(*s);
+#endif
+
+#if defined(BOTAN_HAS_DSA)
+   if(const DSA_PublicKey* s = dynamic_cast<const DSA_PublicKey*>(&key))
+      return new OSSL_DSA_Verification_Operation(*s);
+#endif
+
+   return 0;
+   }
+
+PK_Ops::Encryption*
+OpenSSL_Engine::get_encryption_op(const Public_Key& key, RandomNumberGenerator&) const
+   {
+#if defined(BOTAN_HAS_RSA)
+   if(const RSA_PublicKey* s = dynamic_cast<const RSA_PublicKey*>(&key))
+      return new OSSL_RSA_Public_Operation(*s);
+#endif
+
+   return 0;
+   }
+
+PK_Ops::Decryption*
+OpenSSL_Engine::get_decryption_op(const Private_Key& key, RandomNumberGenerator&) const
+   {
+#if defined(BOTAN_HAS_RSA)
+   if(const RSA_PrivateKey* s = dynamic_cast<const RSA_PrivateKey*>(&key))
+      return new OSSL_RSA_Private_Operation(*s);
+#endif
+
+   return 0;
+   }
+
+}