release/src/router/libsodium/src/libsodium/crypto_box/curve25519xsalsa20poly1305/ref/before_curve25519xsalsa20poly1305.c

   1 #include "api.h"
   2 #include "crypto_core_hsalsa20.h"
   3 #include "crypto_scalarmult_curve25519.h"
   4
   5 static const unsigned char sigma[16] = {
   6     'e', 'x', 'p', 'a', 'n', 'd', ' ', '3', '2', '-', 'b', 'y', 't', 'e', ' ', 'k'
   7 };
   8 static const unsigned char n[16] = {0};
   9
  10 int crypto_box_beforenm(
  11   unsigned char *k,
  12   const unsigned char *pk,
  13   const unsigned char *sk
  14 )
  15 {
  16   unsigned char s[32];
  17   crypto_scalarmult_curve25519(s,sk,pk);
  18   return crypto_core_hsalsa20(k,n,s,sigma);
  19 }