int crypto_aead_decrypt(
unsigned char *m,unsigned long long *mlen,
unsigned char *nsec,
const unsigned char *c,unsigned long long clen,
const unsigned char *ad,unsigned long long adlen,
const unsigned char *npub,
const unsigned char *k
)
{
Keyak_Instance instance;
unsigned char tag[16];
if (clen < 16)
return -1;
RiverKeyak_Initialize(&instance, k, 128, npub);
Keyak_FeedAssociatedData(&instance, ad, adlen);
*mlen = clen-16;
Keyak_UnwrapCiphertext(&instance, c, m, *mlen);
Keyak_GetTag(&instance, tag, 16);
if (memcmp(tag, c+(*mlen), 16) != 0) {
memset(m, 0, *mlen);
return -1;
}
else
return 0;
}
int crypto_aead_encrypt(
unsigned char *c,unsigned long long *clen,
const unsigned char *m,unsigned long long mlen,
const unsigned char *ad,unsigned long long adlen,
const unsigned char *nsec,
const unsigned char *npub,
const unsigned char *k
)
{
RiverKeyak_Instance instance;
RiverKeyak_Initialize( &instance, k, 16, npub, 58, 0, 0, 0, 0 );
RiverKeyak_Wrap( &instance, m, c, (size_t)mlen, ad, (size_t)adlen, c+mlen, 0, 0 );
*clen = mlen + 16;
return 0;
}
int crypto_aead_encrypt(
unsigned char *c,unsigned long long *clen,
const unsigned char *m,unsigned long long mlen,
const unsigned char *ad,unsigned long long adlen,
const unsigned char *nsec,
const unsigned char *npub,
const unsigned char *k
)
{
Keyak_Instance instance;
RiverKeyak_Initialize(&instance, k, 128, npub);
Keyak_FeedAssociatedData(&instance, ad, adlen);
Keyak_WrapPlaintext(&instance, m, c, mlen);
*clen = mlen;
Keyak_GetTag(&instance, c+mlen, 16);
*clen += 16;
return 0;
}
int crypto_aead_decrypt(
unsigned char *m,unsigned long long *mlen,
unsigned char *nsec,
const unsigned char *c,unsigned long long clen,
const unsigned char *ad,unsigned long long adlen,
const unsigned char *npub,
const unsigned char *k
)
{
RiverKeyak_Instance instance;
unsigned long long mlen_;
if (clen < 16)
return -1;
RiverKeyak_Initialize( &instance, k, 16, npub, 58, 0, 0, 1, 0 );
mlen_ = clen - 16;
*mlen = mlen_;
if ( RiverKeyak_Wrap( &instance, c, m, (size_t)mlen_, ad, (size_t)adlen, (unsigned char *)c+mlen_, 1, 0 ) == 1 )
return 0;
return -1;
}
