text: #include "ed25519-donna-portable-identify.h"
  
  #define mul32x32_64(a,b) (((uint64_t)(a))*(b))
  
  /* platform */
  #if defined(COMPILER_MSVC)
    #include <intrin.h>
    #if !defined(_DEBUG)
      #undef mul32x32_64
      #define mul32x32_64(a,b) __emulu(a,b)
    #endif
    #undef inline
    #define inline __forceinline
    #define DONNA_INLINE __forceinline
    #define DONNA_NOINLINE __declspec(noinline)
    #define ALIGN(x) __declspec(align(x))
    #define ROTL32(a,b) _rotl(a,b)
    #define ROTR32(a,b) _rotr(a,b)
  #else
    #include <sys/param.h>
    #define DONNA_INLINE inline __attribute__((always_inline))
    #define DONNA_NOINLINE __attribute__((noinline))
    #define ALIGN(x) __attribute__((aligned(x)))
    #define ROTL32(a,b) (((a) << (b)) | ((a) >> (32 - b)))
    #define ROTR32(a,b) (((a) >> (b)) | ((a) << (32 - b)))
  #endif
  
  /* uint128_t */
  #if defined(CPU_64BITS) && !defined(BCRYPTO_ED25519_FORCE_32BIT)
    #if defined(COMPILER_CLANG) && (COMPILER_CLANG >= 30100)
      #define HAVE_NATIVE_UINT128
      typedef unsigned __int128 uint128_t;
    #elif defined(COMPILER_MSVC)
      #define HAVE_UINT128
      typedef struct uint128_t {
        uint64_t lo, hi;
      } uint128_t;
      #define mul64x64_128(out,a,b) out.lo = _umul128(a,b,&out.hi);
      #define shr128_pair(out,hi,lo,shift) out = __shiftright128(lo, hi, shift);
      #define shl128_pair(out,hi,lo,shift) out = __shiftleft128(lo, hi, shift);
      #define shr128(out,in,shift) shr128_pair(out, in.hi, in.lo, shift)
      #define shl128(out,in,shift) shl128_pair(out, in.hi, in.lo, shift)
      #define add128(a,b) { uint64_t p = a.lo; a.lo += b.lo; a.hi += b.hi + (a.lo < p); }
      #define add128_64(a,b) { uint64_t p = a.lo; a.lo += b; a.hi += (a.lo < p); }
      #define lo128(a) (a.lo)
      #define hi128(a) (a.hi)
    #elif defined(COMPILER_GCC) && !defined(HAVE_NATIVE_UINT128)
      #if defined(__SIZEOF_INT128__)
        #define HAVE_NATIVE_UINT128
        typedef unsigned __int128 uint128_t;
      #elif (COMPILER_GCC >= 40400)
        #define HAVE_NATIVE_UINT128
        typedef unsigned uint128_t __attribute__((mode(TI)));
      #elif defined(CPU_X86_64)
        #define HAVE_UINT128
        typedef struct uint128_t {
          uint64_t lo, hi;
        } uint128_t;
        #define mul64x64_128(out,a,b) __asm__ ("mulq %3" : "=a" (out.lo), "=d" (out.hi) : "a" (a), "rm" (b));
        #define shr128_pair(out,hi,lo,shift) __asm__ ("shrdq %2,%1,%0" : "+r" (lo) : "r" (hi), "J" (shift)); out = lo;
        #define shl128_pair(out,hi,lo,shift) __asm__ ("shldq %2,%1,%0" : "+r" (hi) : "r" (lo), "J" (shift)); out = hi;
        #define shr128(out,in,shift) shr128_pair(out,in.hi, in.lo, shift)
        #define shl128(out,in,shift) shl128_pair(out,in.hi, in.lo, shift)
        #define add128(a,b) __asm__ ("addq %4,%2; adcq %5,%3" : "=r" (a.hi), "=r" (a.lo) : "1" (a.lo), "0" (a.hi), "rm" (b.lo), "rm" (b.hi) : "cc");
        #define add128_64(a,b) __asm__ ("addq %4,%2; adcq $0,%3" : "=r" (a.hi), "=r" (a.lo) : "1" (a.lo), "0" (a.hi), "rm" (b) : "cc");
        #define lo128(a) (a.lo)
        #define hi128(a) (a.hi)
      #endif
    #endif
  
    #if defined(HAVE_NATIVE_UINT128)
      #define HAVE_UINT128
      #define mul64x64_128(out,a,b) out = (uint128_t)a * b;
      #define shr128_pair(out,hi,lo,shift) out = (uint64_t)((((uint128_t)hi << 64) | lo) >> (shift));
      #define shl128_pair(out,hi,lo,shift) out = (uint64_t)(((((uint128_t)hi << 64) | lo) << (shift)) >> 64);
      #define shr128(out,in,shift) out = (uint64_t)(in >> (shift));
      #define shl128(out,in,shift) out = (uint64_t)((in << shift) >> 64);
      #define add128(a,b) a += b;
      #define add128_64(a,b) a += (uint64_t)b;
      #define lo128(a) ((uint64_t)a)
      #define hi128(a) ((uint64_t)(a >> 64))
    #endif
  
    #if !defined(HAVE_UINT128)
      #error Need a uint128_t implementation!
    #endif
  #endif
  
  /* endian */
  #if !defined(BCRYPTO_ED25519_OPENSSLRNG)
  static inline void U32TO8_LE(unsigned char *p, const uint32_t v) {
    p[0] = (unsigned char)(v      );
    p[1] = (unsigned char)(v >>  8);
    p[2] = (unsigned char)(v >> 16);
    p[3] = (unsigned char)(v >> 24);
  }
  #endif
  
  #if !defined(HAVE_UINT128)
  static inline uint32_t U8TO32_LE(const unsigned char *p) {
    return
    (((uint32_t)(p[0])      ) |
     ((uint32_t)(p[1]) <<  8) |
     ((uint32_t)(p[2]) << 16) |
     ((uint32_t)(p[3]) << 24));
  }
  #else
  static inline uint64_t U8TO64_LE(const unsigned char *p) {
    return
    (((uint64_t)(p[0])      ) |
     ((uint64_t)(p[1]) <<  8) |
     ((uint64_t)(p[2]) << 16) |
     ((uint64_t)(p[3]) << 24) |
     ((uint64_t)(p[4]) << 32) |
     ((uint64_t)(p[5]) << 40) |
     ((uint64_t)(p[6]) << 48) |
     ((uint64_t)(p[7]) << 56));
  }
  
  static inline void U64TO8_LE(unsigned char *p, const uint64_t v) {
    p[0] = (unsigned char)(v      );
    p[1] = (unsigned char)(v >>  8);
    p[2] = (unsigned char)(v >> 16);
    p[3] = (unsigned char)(v >> 24);
    p[4] = (unsigned char)(v >> 32);
    p[5] = (unsigned char)(v >> 40);
    p[6] = (unsigned char)(v >> 48);
    p[7] = (unsigned char)(v >> 56);
  }
  #endif
  
  #include <stdlib.h>
  #include <string.h>
  
  
  