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
)
{
if(mlen == 0 && adlen == 0) return RETURN_UNSUPPORTED;
/* set ciphertext length */
*clen = mlen + CRYPTO_ABYTES;
unsigned char tag[CRYPTO_ABYTES];
ae_cxt* cxt = ae_allocate();
if(!cxt)
return RETURN_MEMORY_FAIL;
/* set key and compute round keys */
if(ae_init(cxt, k, CRYPTO_KEYBYTES))
return RETURN_KEYSIZE_ERR;
/* process the associated data */
process_ad(cxt, ad, adlen, npub, CRYPTO_NPUBBYTES);
/* encrypt message */
ae_encrypt(cxt, (unsigned char*)m, mlen, c);
free(cxt);
return RETURN_SUCCESS;
}
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, //not relavent to CLOC
const unsigned char *npub,
const unsigned char *k
)
{
/* set ciphertext length */
*clen = mlen + CRYPTO_ABYTES;
unsigned char tag[CRYPTO_ABYTES];
ae_cxt* cxt = ae_allocate();
if(!cxt)
return RETURN_MEMORY_FAIL;
/* set key and compute round keys */
ae_init(cxt, k, CRYPTO_KEYBYTES * 8);
/* process the associated data */
process_ad(cxt, ad, adlen, npub, CRYPTO_NPUBBYTES);
/* encrypt message */
ae_encrypt(cxt, (unsigned char*)m, mlen, c, tag, CRYPTO_ABYTES, ENC);
/* copy the tag to the end of ciphertext */
memcpy(c+mlen, tag, CRYPTO_ABYTES);
return RETURN_SUCCESS;
}
int crypto_aead_decrypt(
unsigned char *m,unsigned long long *mlen,
unsigned char *nsec, //not relavent to CLOC
const unsigned char *c,unsigned long long clen,
const unsigned char *ad,unsigned long long adlen,
const unsigned char *npub,
const unsigned char *k
)
{
/* set plaintext length */
*mlen = clen - CRYPTO_ABYTES;
unsigned char tag[CRYPTO_ABYTES];
ae_cxt* cxt = ae_allocate();
if(!cxt)
return RETURN_MEMORY_FAIL;
/* set key and compute round keys */
ae_init(cxt, k, CRYPTO_KEYBYTES * 8);
/* process the associated data */
process_ad(cxt, ad, adlen, npub, CRYPTO_NPUBBYTES);
/* decrypt ciphertext */
ae_encrypt(cxt, m, *mlen, (unsigned char*)c, tag, CRYPTO_ABYTES, DEC);
/* compare the tag */
int i;
for(i = 0; i < CRYPTO_ABYTES; i++)
if(tag[i] != c[(*mlen) + i]){
return RETURN_TAG_NO_MATCH;
}
return RETURN_SUCCESS;
}
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
)
{
/* set plaintext length */
*mlen = clen - CRYPTO_ABYTES;
if(mlen == 0 && adlen == 0) return RETURN_UNSUPPORTED;
unsigned char tag[CRYPTO_ABYTES*2];
ae_cxt* cxt = ae_allocate();
if(!cxt)
return RETURN_MEMORY_FAIL;
/* set key and compute round keys */
if(ae_init(cxt, k, CRYPTO_KEYBYTES))
return RETURN_KEYSIZE_ERR;
/* process the associated data */
process_ad(cxt, ad, adlen, npub, CRYPTO_NPUBBYTES);
/* decrypt ciphertext */
ae_decrypt(cxt, m, clen, (unsigned char*)c, tag);
free(cxt);
/* compare the tag */
int i;
if((*mlen) > SLEN && (*mlen % SLEN))
{
for(i = 0; i < CRYPTO_ABYTES; i++)
if(tag[i] != tag[SLEN + i]){
return RETURN_TAG_NO_MATCH;
}
}
else
for(i = 0; i < CRYPTO_ABYTES; i++)
if(tag[i] != c[(*mlen) + i]){
return RETURN_TAG_NO_MATCH;
}
return RETURN_SUCCESS;
}
