release/src/router/libsodium/src/libsodium/crypto_secretbox/xsalsa20poly1305/ref/box_xsalsa20poly1305.c

   1 #include "api.h"
   2 #include "crypto_onetimeauth_poly1305.h"
   3 #include "crypto_stream_xsalsa20.h"
   4
   5 int crypto_secretbox(
   6   unsigned char *c,
   7   const unsigned char *m,unsigned long long mlen,
   8   const unsigned char *n,
   9   const unsigned char *k
  10 )
  11 {
  12   int i;
  13   if (mlen < 32) return -1;
  14   crypto_stream_xsalsa20_xor(c,m,mlen,n,k);
  15   crypto_onetimeauth_poly1305(c + 16,c + 32,mlen - 32,c);
  16   for (i = 0;i < 16;++i) c[i] = 0;
  17   return 0;
  18 }
  19
  20 int crypto_secretbox_open(
  21   unsigned char *m,
  22   const unsigned char *c,unsigned long long clen,
  23   const unsigned char *n,
  24   const unsigned char *k
  25 )
  26 {
  27   int i;
  28   unsigned char subkey[32];
  29   if (clen < 32) return -1;
  30   crypto_stream_xsalsa20(subkey,32,n,k);
  31   if (crypto_onetimeauth_poly1305_verify(c + 16,c + 32,clen - 32,subkey) != 0) return -1;
  32   crypto_stream_xsalsa20_xor(m,c,clen,n,k);
  33   for (i = 0;i < 32;++i) m[i] = 0;
  34   return 0;
  35 }