void
LRWMode::EncryptBlock(ThreadContext& context, uint8 *data, size_t length,
uint64 blockIndex)
{
uint8 i[8];
uint8 t[16];
uint32 b;
blockIndex = ((blockIndex - fOffset) << 5) + 1;
*(uint64*)i = B_HOST_TO_BENDIAN_INT64(blockIndex);
for (b = 0; b < length >> 4; b++) {
gf128_mul_by_tab64(i, t,
(galois_field_context*)context.BufferFor(fGaloisField));
xor128((uint64*)data, (uint64*)t);
fAlgorithm->Encrypt(context, data, 16);
xor128((uint64*)data, (uint64*)t);
data += 16;
if (i[7] != 0xff)
i[7]++;
else {
*(uint64*)i = B_HOST_TO_BENDIAN_INT64(
B_BENDIAN_TO_HOST_INT64(*(uint64*)i) + 1);
}
}
memset(t, 0, sizeof (t));
}
void
AESAlgorithm::Encrypt(ThreadContext& context, uint8 *data, size_t length)
{
//dprintf(" aes-encrypt-pre: %x\n", *(int*)data);
aes_encrypt(data, data,
(const aes_encrypt_ctx*)context.BufferFor(fEncryptScheduler));
//dprintf(" aes-encrypt-post: %x\n", *(int*)data);
}
status_t
AESAlgorithm::SetKey(ThreadContext& context, const uint8* key,
size_t keyLength)
{
//dprintf("%s-aes key: %x (%lu)\n", fMode == MODE_LRW ? "lrw" : "xts", *(int*)key, keyLength);
if (aes_encrypt_key(key, keyLength,
(aes_encrypt_ctx*)context.BufferFor(fEncryptScheduler))
!= EXIT_SUCCESS)
return B_ERROR;
if (aes_decrypt_key(key, keyLength,
(aes_decrypt_ctx*)context.BufferFor(fDecryptScheduler))
!= EXIT_SUCCESS)
return B_ERROR;
return B_OK;
}
status_t
LRWMode::SetKey(ThreadContext& context, const uint8* key, size_t keyLength)
{
//dprintf("lrw key: %x\n", *(int*)key);
gf128_tab64_init(key,
(struct galois_field_context*)context.BufferFor(fGaloisField));
return B_OK;
}
