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-rw-r--r--src/libstate/engine/openssl/ossl_dh.cpp58
1 files changed, 58 insertions, 0 deletions
diff --git a/src/libstate/engine/openssl/ossl_dh.cpp b/src/libstate/engine/openssl/ossl_dh.cpp
new file mode 100644
index 000000000..290b95622
--- /dev/null
+++ b/src/libstate/engine/openssl/ossl_dh.cpp
@@ -0,0 +1,58 @@
+/*************************************************
+* OpenSSL Engine Source File *
+* (C) 1999-2007 Jack Lloyd *
+*************************************************/
+
+#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 {
+
+#if defined(BOTAN_HAS_DIFFIE_HELLMAN)
+
+namespace {
+
+/*************************************************
+* 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 a DH op *
+*************************************************/
+DH_Operation* OpenSSL_Engine::dh_op(const DL_Group& group,
+ const BigInt& x) const
+ {
+ return new OpenSSL_DH_Op(group, x);
+ }
+#endif
+
+}