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 )
{
ICESTATE S;
unsigned int frameBit;
/* initialize the state with secret key and nonce */
initState256a(S, k, npub);
/* ciphertext length is plaintext len + size of tag and nsec */
*clen = mlen + ICEPOLETAGLEN;
/* secret message number is zero length */
processDataBlock(S, NULL, NULL, 0, 0);
/* process auth-only associated data blocks */
do {
unsigned long long blocklen = ICEPOLEDATABLOCKLEN;
frameBit = (adlen <= blocklen ? 1 : 0); /* is it the last block? */
if (adlen < blocklen) {
blocklen = adlen;
}
/* apply the permutation to the state */
P6(S,S);
/* absorb a data block */
processDataBlock(S, ad, NULL, blocklen, frameBit);
ad += blocklen;
adlen -= blocklen;
} while (adlen > 0);
/* process plaintext blocks to get the ciphertext */
do {
unsigned long long blocklen = ICEPOLEDATABLOCKLEN;
frameBit = (mlen <=blocklen ? 0 : 1);
if (mlen < blocklen) {
blocklen = mlen;
}
/* apply the permutation to the state */
P6(S,S);
/* absorb a data block and produce a ciphertext block */
processDataBlock(S, m, &c, blocklen, frameBit);
m += blocklen;
mlen -= blocklen;
} while (mlen > 0);
/* store authentication tag at the end of the ciphertext */
generateTag(S, c);
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
)
{
ICESTATE S;
unsigned char Tcomp[ICEPOLETAGLEN]; /* computed authentication tag */
unsigned int frameBit;
/* ciphertext cannot be shorter than the tag length */
if (clen < ICEPOLETAGLEN) {
return -1;
}
initState256a(S, k, npub);
/* secret message number is zero-length */
frameBit = 0;
processDataBlockRev(S, NULL, NULL, 0, frameBit);
/* process associated data blocks */
do {
unsigned long long blocklen = ICEPOLEDATABLOCKLEN;
frameBit = (adlen <= blocklen ? 1 : 0);
if (adlen < blocklen) {
blocklen = adlen;
}
/* apply the permutation to the state */
P6(S,S);
/* absorb a data block */
processDataBlock(S, ad, NULL, blocklen, frameBit);
ad += blocklen;
adlen -= blocklen;
} while (adlen > 0);
/* process ciphertext blocks to get auth tag */
*mlen = 0;
clen -= ICEPOLETAGLEN; /* need to stop before auth tag*/
do {
unsigned long long blocklen = ICEPOLEDATABLOCKLEN;
frameBit = (clen <= blocklen ? 0 : 1);
if (clen < blocklen) {
blocklen = clen;
}
/* apply the permutation to the state */
P6(S,S);
/* absorb a ciphertext block and produce a plaintext block */
processDataBlockRev(S, c, &m, blocklen, frameBit);
c += blocklen;
*mlen += blocklen;
clen -= blocklen;
} while (clen > 0);
/* compare computed and received auth tags */
generateTag(S, Tcomp);
if (memcmp(Tcomp, c, ICEPOLETAGLEN)) {
*mlen = 0;
return -1;
}
return 0;
}
//位置インデックスとタグを変更する
void BallSprite::setPositionIndex(PositionIndex positionIndex)
{
_positionIndex = positionIndex; //位置インデックスを保持する
setTag(generateTag(_positionIndex)); //タグをセットする
}
