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#include "crypto_onetimeauth_poly1305.h"
#include "crypto_stream_xsalsa20.h"
#include "crypto_secretbox.h"
int crypto_secretbox(
unsigned char *c,
const unsigned char *m,unsigned long long mlen,
const unsigned char *n,
const unsigned char *k
)
{
int i;
if (mlen < 32) return -1;
crypto_stream_xsalsa20_xor(c,m,mlen,n,k);
crypto_onetimeauth_poly1305(c + 16,c + 32,mlen - 32,c);
for (i = 0;i < 16;++i) c[i] = 0;
return 0;
}
int crypto_secretbox_open(
unsigned char *m,
const unsigned char *c,unsigned long long clen,
const unsigned char *n,
const unsigned char *k
)
{
int i;
unsigned char subkey[32];
if (clen < 32) return -1;
crypto_stream_xsalsa20(subkey,32,n,k);
if (crypto_onetimeauth_poly1305_verify(c + 16,c + 32,clen - 32,subkey) != 0) return -1;
crypto_stream_xsalsa20_xor(m,c,clen,n,k);
for (i = 0;i < 32;++i) m[i] = 0;
return 0;
}
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