static void aes_gctr(void *aes, const u8 *icb, const u8 *x, size_t xlen, u8 *y)
{
size_t i, n, last;
u8 cb[AES_BLOCK_SIZE], tmp[AES_BLOCK_SIZE];
const u8 *xpos = x;
u8 *ypos = y;
if (xlen == 0)
return;
n = xlen / 16;
os_memcpy(cb, icb, AES_BLOCK_SIZE);
/* Full blocks */
for (i = 0; i < n; i++) {
aes_encrypt(aes, cb, ypos);
xor_block(ypos, xpos);
xpos += AES_BLOCK_SIZE;
ypos += AES_BLOCK_SIZE;
inc32(cb);
}
last = x + xlen - xpos;
if (last) {
/* Last, partial block */
aes_encrypt(aes, cb, tmp);
for (i = 0; i < last; i++)
*ypos++ = *xpos++ ^ tmp[i];
}
}
static void aes_gcm_gctr(void *aes, const u8 *J0, const u8 *in, size_t len,
u8 *out)
{
u8 J0inc[AES_BLOCK_SIZE];
if (len == 0)
return;
os_memcpy(J0inc, J0, AES_BLOCK_SIZE);
inc32(J0inc);
aes_gctr(aes, J0inc, in, len, out);
}
static void aes_gcm_gctr(void *aes, const aes_uchar *J0, const aes_uchar *in, size_t len,
aes_uchar *out)
{
aes_uchar J0inc[AES_BLOCK_SIZE];
if (len == 0)
return;
memcpy(J0inc, J0, AES_BLOCK_SIZE);
inc32(J0inc);
aes_gctr(aes, J0inc, in, len, out);
}
