release/src/router/libsodium/src/libsodium/crypto_stream/xsalsa20/ref/xor_xsalsa20.c

   1 /*
   2 version 20080913
   3 D. J. Bernstein
   4 Public domain.
   5 */
   6
   7 #include "api.h"
   8 #include "crypto_core_hsalsa20.h"
   9 #include "crypto_stream_salsa20.h"
  10
  11 static const unsigned char sigma[16] = {
  12     'e', 'x', 'p', 'a', 'n', 'd', ' ', '3', '2', '-', 'b', 'y', 't', 'e', ' ', 'k'
  13 };
  14
  15 int crypto_stream_xor(
  16         unsigned char *c,
  17   const unsigned char *m,unsigned long long mlen,
  18   const unsigned char *n,
  19   const unsigned char *k
  20 )
  21 {
  22   unsigned char subkey[32];
  23   crypto_core_hsalsa20(subkey,n,k,sigma);
  24   return crypto_stream_salsa20_xor(c,m,mlen,n + 16,subkey);
  25 }