diff --git a/ed25519/src/fixedint.h b/ed25519/src/fixedint.h
index 08f989ae1..c7f608c4b 100644
--- a/ed25519/src/fixedint.h
+++ b/ed25519/src/fixedint.h
@@ -1,82 +1,6 @@
-/*
-    Portable header to provide the 32 and 64 bits type.
+#include <boost/cstdint.hpp>
 
-    Not a compatible replacement for <stdint.h>, do not blindly use it as such.
-*/
+using boost::uint64_t;
+using boost::int64_t;
+using boost::int32_t;
 
-#ifdef _MSC_VER
-#pragma warning(push)
-#pragma warning(disable : 4142 ) /* warning C4142: benign redefinition oef type */
-#pragma warning(disable : 4005 ) /* warning C4005: 'UINT64_C' : macro redefinition */
-#endif // _MSC_VER
-
-#if ((defined(__STDC__) && __STDC__ && __STDC_VERSION__ >= 199901L) || (defined(__WATCOMC__) && (defined(_STDINT_H_INCLUDED) || __WATCOMC__ >= 1250)) || (defined(__GNUC__) && (defined(_STDINT_H) || defined(_STDINT_H_) || defined(__UINT_FAST64_TYPE__)) )) && !defined(FIXEDINT_H_INCLUDED)
-    #include <stdint.h>
-    #define FIXEDINT_H_INCLUDED
-
-    #if defined(__WATCOMC__) && __WATCOMC__ >= 1250 && !defined(UINT64_C)
-        #include <limits.h>
-        #define UINT64_C(x) (x + (UINT64_MAX - UINT64_MAX))
-    #endif
-#endif
-
-
-#ifndef FIXEDINT_H_INCLUDED
-    #define FIXEDINT_H_INCLUDED
-
-    #include <limits.h>
-
-    /* (u)int32_t */
-    #ifndef uint32_t
-        #if (ULONG_MAX == 0xffffffffUL)
-            typedef unsigned long uint32_t;
-        #elif (UINT_MAX == 0xffffffffUL)
-            typedef unsigned int uint32_t;
-        #elif (USHRT_MAX == 0xffffffffUL)
-            typedef unsigned short uint32_t;
-        #endif
-    #endif
-
-
-    #ifndef int32_t
-        #if (LONG_MAX == 0x7fffffffL)
-            typedef signed long int32_t;
-        #elif (INT_MAX == 0x7fffffffL)
-            typedef signed int int32_t;
-        #elif (SHRT_MAX == 0x7fffffffL)
-            typedef signed short int32_t;
-        #endif
-    #endif
-
-
-    /* (u)int64_t */
-    #if (defined(__STDC__) && defined(__STDC_VERSION__) && __STDC__ && __STDC_VERSION__ >= 199901L)
-        typedef long long int64_t;
-        typedef unsigned long long uint64_t;
-
-        #define UINT64_C(v) v ##ULL
-        #define INT64_C(v) v ##LL
-    #elif defined(__GNUC__)
-        __extension__ typedef long long int64_t;
-        __extension__ typedef unsigned long long uint64_t;
-
-        #define UINT64_C(v) v ##ULL
-        #define INT64_C(v) v ##LL
-    #elif defined(__MWERKS__) || defined(__SUNPRO_C) || defined(__SUNPRO_CC) || defined(__APPLE_CC__) || defined(_LONG_LONG) || defined(_CRAYC)
-        typedef long long int64_t;
-        typedef unsigned long long uint64_t;
-
-        #define UINT64_C(v) v ##ULL
-        #define INT64_C(v) v ##LL
-    #elif (defined(__WATCOMC__) && defined(__WATCOM_INT64__)) || (defined(_MSC_VER) && _INTEGRAL_MAX_BITS >= 64) || (defined(__BORLANDC__) && __BORLANDC__ > 0x460) || defined(__alpha) || defined(__DECC)
-        typedef __int64 int64_t;
-        typedef unsigned __int64 uint64_t;
-
-        #define UINT64_C(v) v ##UI64
-        #define INT64_C(v) v ##I64
-    #endif
-#endif
-
-#ifdef _MSC_VER
-#pragma warning(pop)
-#endif // _MSC_VER