Commit 71afcdd7 authored by Robert Ransom's avatar Robert Ransom
Browse files

Add comments marking the beginning and end of coordinate-field operations 

This makes it much easier for a simple script to extract the
coordinate-field operations for use in other software operating on the
Curve25519 elliptic curve (or other curves with the same coordinate field).
parent da7b6b82

curve25519-donna-c64.c

+5 −0
Original line number Diff line number Diff line
@@ -26,6 +26,9 @@ 
#include <stdint.h>



typedef uint8_t u8;



/* Beginning of Curve25519 coordinate-field operation functions */



typedef uint64_t limb;

typedef limb felem[5];

// This is a special gcc mode for 128-bit integers. It's implemented on 64-bit
@@ -318,6 +321,8 @@ crecip(felem out, const felem z) { 
  /* 2^255 - 21 */ fmul(out, t0, a);

}



/* End of Curve25519 coordinate-field operation functions */



/* Input: Q, Q', Q-Q'

 * Output: 2Q, Q+Q'

 *

curve25519-donna.c

+5 −0
Original line number Diff line number Diff line
@@ -51,6 +51,9 @@ 


typedef uint8_t u8;

typedef int32_t s32;



/* Beginning of Curve25519 coordinate-field operation functions */



typedef int64_t limb;



typedef limb felem_short[10];
@@ -585,6 +588,8 @@ crecip(felem_short out, const felem_short z) { 
  /* 2^255 - 21 */ fmul(out,t1,z11);

}



/* End of Curve25519 coordinate-field operation functions */



/* Input: Q, Q', Q-Q'

 * Output: 2Q, Q+Q'

 *