1 files changed, 101 insertions, 0 deletions
diff --git a/lib/engine/gnump/gmp_wrap.cpp b/lib/engine/gnump/gmp_wrap.cpp
new file mode 100644
index 000000000..974593d02
--- /dev/null
+++ b/lib/engine/gnump/gmp_wrap.cpp
@@ -0,0 +1,101 @@
+/*
+* GMP Wrapper
+* (C) 1999-2007 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#include <botan/internal/gmp_wrap.h>
+
+#define GNU_MP_VERSION_CODE_FOR(a,b,c) ((a << 16) | (b << 8) | (c))
+
+#define GNU_MP_VERSION_CODE \
+   GNU_MP_VERSION_CODE_FOR(__GNU_MP_VERSION, __GNU_MP_VERSION_MINOR, \
+                           __GNU_MP_VERSION_PATCHLEVEL)
+
+#if GNU_MP_VERSION_CODE < GNU_MP_VERSION_CODE_FOR(4,1,0)
+  #error Your GNU MP install is too old, upgrade to 4.1 or later
+#endif
+
+namespace Botan {
+
+/*
+* GMP_MPZ Constructor
+*/
+GMP_MPZ::GMP_MPZ(const BigInt& in)
+   {
+   mpz_init(value);
+   if(in != 0)
+      mpz_import(value, in.sig_words(), -1, sizeof(word), 0, 0, in.data());
+   }
+
+/*
+* GMP_MPZ Constructor
+*/
+GMP_MPZ::GMP_MPZ(const byte in[], size_t length)
+   {
+   mpz_init(value);
+   mpz_import(value, length, 1, 1, 0, 0, in);
+   }
+
+/*
+* GMP_MPZ Copy Constructor
+*/
+GMP_MPZ::GMP_MPZ(const GMP_MPZ& other)
+   {
+   mpz_init_set(value, other.value);
+   }
+
+/*
+* GMP_MPZ Destructor
+*/
+GMP_MPZ::~GMP_MPZ()
+   {
+   mpz_clear(value);
+   }
+
+/*
+* GMP_MPZ Assignment Operator
+*/
+GMP_MPZ& GMP_MPZ::operator=(const GMP_MPZ& other)
+   {
+   mpz_set(value, other.value);
+   return (*this);
+   }
+
+/*
+* Export the mpz_t as a bytestring
+*/
+void GMP_MPZ::encode(byte out[], size_t length) const
+   {
+   size_t dummy = 0;
+   mpz_export(out + (length - bytes()), &dummy, 1, 1, 0, 0, value);
+   }
+
+/*
+* Return the number of significant bytes
+*/
+size_t GMP_MPZ::bytes() const
+   {
+   return ((mpz_sizeinbase(value, 2) + 7) / 8);
+   }
+
+/*
+* GMP to BigInt Conversions
+*/
+BigInt GMP_MPZ::to_bigint() const
+   {
+   BigInt out(BigInt::Positive, (bytes() + sizeof(word) - 1) / sizeof(word));
+   size_t dummy = 0;
+
+   word* reg = out.mutable_data();
+
+   mpz_export(reg, &dummy, -1, sizeof(word), 0, 0, value);
+
+   if(mpz_sgn(value) < 0)
+      out.flip_sign();
+
+   return out;
+   }
+
+}