void lrw_gen(void)
{
#ifdef LTC_LRW_MODE
FILE *out;
unsigned char tweak[16], key[16], iv[16], buf[1024];
int x, y, err;
symmetric_LRW lrw;
/* initialize default key and tweak */
for (x = 0; x < 16; x++) {
tweak[x] = key[x] = iv[x] = x;
}
out = fopen("lrw_tv.txt", "w");
for (x = 16; x < (int)(sizeof(buf)); x += 16) {
if ((err = lrw_start(find_cipher("aes"), iv, key, 16, tweak, 0, &lrw)) != CRYPT_OK) {
fprintf(stderr, "Error starting LRW-AES: %s\n", error_to_string(err));
exit(EXIT_FAILURE);
}
/* encrypt incremental */
for (y = 0; y < x; y++) {
buf[y] = y & 255;
}
if ((err = lrw_encrypt(buf, buf, x, &lrw)) != CRYPT_OK) {
fprintf(stderr, "Error encrypting with LRW-AES: %s\n", error_to_string(err));
exit(EXIT_FAILURE);
}
/* display it */
fprintf(out, "%d:", x);
for (y = 0; y < x; y++) {
fprintf(out, "%02x", buf[y]);
}
fprintf(out, "\n");
/* reset IV */
if ((err = lrw_setiv(iv, 16, &lrw)) != CRYPT_OK) {
fprintf(stderr, "Error setting IV: %s\n", error_to_string(err));
exit(EXIT_FAILURE);
}
/* copy new tweak, iv and key */
for (y = 0; y < 16; y++) {
key[y] = buf[y];
iv[y] = buf[(y+16)%x];
tweak[y] = buf[(y+32)%x];
}
if ((err = lrw_decrypt(buf, buf, x, &lrw)) != CRYPT_OK) {
fprintf(stderr, "Error decrypting with LRW-AES: %s\n", error_to_string(err));
exit(EXIT_FAILURE);
}
/* display it */
fprintf(out, "%d:", x);
for (y = 0; y < x; y++) {
fprintf(out, "%02x", buf[y]);
}
fprintf(out, "\n");
lrw_done(&lrw);
}
fclose(out);
#endif
}
/**
Test LRW against specs
@return CRYPT_OK if goodly
*/
int lrw_test(void)
{
#ifndef LTC_TEST
return CRYPT_NOP;
#else
static const struct {
unsigned char key[16], tweak[16], IV[16], P[16], expected_tweak[16], C[16];
} tests[] = {
{
{ 0x45, 0x62, 0xac, 0x25, 0xf8, 0x28, 0x17, 0x6d, 0x4c, 0x26, 0x84, 0x14, 0xb5, 0x68, 0x01, 0x85 },
{ 0x25, 0x8e, 0x2a, 0x05, 0xe7, 0x3e, 0x9d, 0x03, 0xee, 0x5a, 0x83, 0x0c, 0xcc, 0x09, 0x4c, 0x87 },
{ 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
{ 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46 },
{ 0x25, 0x8e, 0x2a, 0x05, 0xe7, 0x3e, 0x9d, 0x03, 0xee, 0x5a, 0x83, 0x0c, 0xcc, 0x09, 0x4c, 0x87 },
{ 0xf1, 0xb2, 0x73, 0xcd, 0x65, 0xa3, 0xdf, 0x5f, 0xe9, 0x5d, 0x48, 0x92, 0x54, 0x63, 0x4e, 0xb8 }
},
{
{ 0x59, 0x70, 0x47, 0x14, 0xf5, 0x57, 0x47, 0x8c, 0xd7, 0x79, 0xe8, 0x0f, 0x54, 0x88, 0x79, 0x44 },
{ 0x35, 0x23, 0xc2, 0xde, 0xc5, 0x69, 0x4f, 0xa8, 0x72, 0xa9, 0xac, 0xa7, 0x0b, 0x2b, 0xee, 0xbc },
{ 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
{ 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46 },
{ 0x1a, 0x91, 0xe1, 0x6f, 0x62, 0xb4, 0xa7, 0xd4, 0x39, 0x54, 0xd6, 0x53, 0x85, 0x95, 0xf7, 0x5e },
{ 0x00, 0xc8, 0x2b, 0xae, 0x95, 0xbb, 0xcd, 0xe5, 0x27, 0x4f, 0x07, 0x69, 0xb2, 0x60, 0xe1, 0x36 },
},
{
{ 0x59, 0x70, 0x47, 0x14, 0xf5, 0x57, 0x47, 0x8c, 0xd7, 0x79, 0xe8, 0x0f, 0x54, 0x88, 0x79, 0x44 },
{ 0x67, 0x53, 0xc9, 0x0c, 0xb7, 0xd8, 0xcd, 0xe5, 0x06, 0xa0, 0x47, 0x78, 0x1a, 0xad, 0x85, 0x11 },
{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02 },
{ 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46 },
{ 0x1a, 0x91, 0xe1, 0x6f, 0x62, 0xb4, 0xa7, 0xd4, 0x39, 0x54, 0xd6, 0x53, 0x85, 0x95, 0xf7, 0x5e },
{ 0x00, 0xc8, 0x2b, 0xae, 0x95, 0xbb, 0xcd, 0xe5, 0x27, 0x4f, 0x07, 0x69, 0xb2, 0x60, 0xe1, 0x36 },
},
{
{ 0xd8, 0x2a, 0x91, 0x34, 0xb2, 0x6a, 0x56, 0x50, 0x30, 0xfe, 0x69, 0xe2, 0x37, 0x7f, 0x98, 0x47 },
{ 0x4e, 0xb5, 0x5d, 0x31, 0x05, 0x97, 0x3a, 0x3f, 0x5e, 0x23, 0xda, 0xfb, 0x5a, 0x45, 0xd6, 0xc0 },
{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00 },
{ 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46 },
{ 0x18, 0xc9, 0x1f, 0x6d, 0x60, 0x1a, 0x1a, 0x37, 0x5d, 0x0b, 0x0e, 0xf7, 0x3a, 0xd5, 0x74, 0xc4 },
{ 0x76, 0x32, 0x21, 0x83, 0xed, 0x8f, 0xf1, 0x82, 0xf9, 0x59, 0x62, 0x03, 0x69, 0x0e, 0x5e, 0x01 },
}
};
int idx, err, x;
symmetric_LRW lrw;
unsigned char buf[2][16];
idx = find_cipher("aes");
if (idx == -1) {
idx = find_cipher("rijndael");
if (idx == -1) {
return CRYPT_NOP;
}
}
for (x = 0; x < (int)(sizeof(tests)/sizeof(tests[0])); x++) {
/* schedule it */
if ((err = lrw_start(idx, tests[x].IV, tests[x].key, 16, tests[x].tweak, 0, &lrw)) != CRYPT_OK) {
return err;
}
/* check pad against expected tweak */
if (XMEMCMP(tests[x].expected_tweak, lrw.pad, 16)) {
lrw_done(&lrw);
return CRYPT_FAIL_TESTVECTOR;
}
/* process block */
if ((err = lrw_encrypt(tests[x].P, buf[0], 16, &lrw)) != CRYPT_OK) {
lrw_done(&lrw);
return err;
}
if (XMEMCMP(buf[0], tests[x].C, 16)) {
lrw_done(&lrw);
return CRYPT_FAIL_TESTVECTOR;
}
/* process block */
if ((err = lrw_setiv(tests[x].IV, 16, &lrw)) != CRYPT_OK) {
lrw_done(&lrw);
return err;
}
if ((err = lrw_decrypt(buf[0], buf[1], 16, &lrw)) != CRYPT_OK) {
lrw_done(&lrw);
return err;
}
if (XMEMCMP(buf[1], tests[x].P, 16)) {
lrw_done(&lrw);
return CRYPT_FAIL_TESTVECTOR;
}
if ((err = lrw_done(&lrw)) != CRYPT_OK) {
return err;
}
}
return CRYPT_OK;
#endif
}
// =========================================================================
// Encrypt/Decrypt function
// Note: PlaintextLength must be set to the size of the PlaintextData buffer on
// entry; on exit, this will be set to the size of the buffer used.
NTSTATUS
ImpCypherCryptData(
IN GUID* CypherGUID,
IN LARGE_INTEGER SectorID,
IN int SectorSize, // In bytes
IN int KeyLength, // In bits
IN FREEOTFEBYTE* Key,
IN char* KeyASCII, // ASCII representation of "Key"
IN int IVLength, // In bits
IN FREEOTFEBYTE* IV,
IN BOOLEAN encryptNotDecrypt, // TRUE = encrypt; FALSE = decrypt
IN int InLength, // In bytes
IN FREEOTFEBYTE* InData,
OUT FREEOTFEBYTE* OutData
)
{
NTSTATUS status = STATUS_SUCCESS;
// libtomcrypt can't handle NULL IVs in CBC mode - it ASSERTs that IV != NULL
char ltcNullIV[FREEOTFE_MAX_CYPHER_BLOCKSIZE];
int cipher;
symmetric_CBC *cbc;
symmetric_LRW *lrw;
symmetric_xts *xts;
int errnum;
CYPHER_MODE mode;
int keySizeUnderlying;
LARGE_INTEGER blockID64;
INTEGER_128 blockID128;
DEBUGOUTCYPHERIMPL(DEBUGLEV_ENTER, (TEXT("ImpCypherDecryptData\n")));
status = DetermineCypherDetails(
CypherGUID,
&keySizeUnderlying,
&mode
);
// libtomcrypt can't handle NULL IVs in CBC mode - it ASSERTs that IV != NULL
if ( (IVLength == 0) || (IV == NULL) )
{
FREEOTFE_MEMZERO(<cNullIV, sizeof(ltcNullIV));
IV = (char*)<cNullIV;
}
// Sanity check on key supplied
if NT_SUCCESS(status)
{
switch (mode)
{
case CYPHER_MODE_CBC:
{
if (KeyLength != keySizeUnderlying)
{
status = STATUS_INVALID_PARAMETER;
}
break;
}
case CYPHER_MODE_XTS:
{
if (KeyLength != (2 * keySizeUnderlying))
{
status = STATUS_INVALID_PARAMETER;
}
break;
}
case CYPHER_MODE_LRW:
{
if (KeyLength != (keySizeUnderlying + (twofish_desc.block_length * 8)))
{
status = STATUS_INVALID_PARAMETER;
}
break;
}
}
}
if NT_SUCCESS(status)
{
status = InitLTCCypher(&cipher);
}
if NT_SUCCESS(status)
{
switch (mode)
{
case CYPHER_MODE_CBC:
{
cbc = FREEOTFE_MEMALLOC(sizeof(symmetric_CBC));
FREEOTFE_MEMZERO(cbc, sizeof(symmetric_CBC));
// Start a CBC session
if ((errnum = cbc_start(
cipher,
IV,
Key,
(keySizeUnderlying/8),
0,
cbc
)) != CRYPT_OK)
{
status = STATUS_UNSUCCESSFUL;
DEBUGOUTCYPHERIMPL(DEBUGLEV_ERROR, (TEXT("Unable to start CBC session (errnum: %d)\n"), errnum));
}
else
{
if (encryptNotDecrypt)
{
if ((errnum = cbc_encrypt(
InData,
OutData,
InLength,
cbc
)) != CRYPT_OK)
{
DEBUGOUTCYPHERIMPL(DEBUGLEV_ERROR, (TEXT("Unable to encrypt block (errnum: %d)\n"), errnum));
status = STATUS_UNSUCCESSFUL;
}
}
else
{
if ((errnum = cbc_decrypt(
InData,
OutData,
InLength,
cbc
)) != CRYPT_OK)
{
DEBUGOUTCYPHERIMPL(DEBUGLEV_ERROR, (TEXT("Unable to decrypt block (errnum: %d)\n"), errnum));
status = STATUS_UNSUCCESSFUL;
}
}
cbc_done(cbc);
}
SecZeroMemory(cbc, sizeof(symmetric_CBC));
FREEOTFE_FREE(cbc);
break;
}
case CYPHER_MODE_LRW:
{
lrw = FREEOTFE_MEMALLOC(sizeof(symmetric_LRW));
FREEOTFE_MEMZERO(lrw, sizeof(symmetric_LRW));
// Generate index in correct format
// LRW uses:
// *) The block index (i.e. the number of 128 bit blocks)
// *) The first block has block index 1 - not 0!
// *) Bigendian format
// Note: LTC increments this itself as it processes each block
SectorIDToBlockIdx_64Bit(SectorID, SectorSize, &blockID64);
LARGE_INTEGER__To__INTEGER_128_BigEndian(
blockID64,
blockID128
);
IV = blockID128;
// Start a LRW session
if ((errnum = lrw_start(
cipher,
IV,
Key,
(keySizeUnderlying/8),
// 128 bits tweak key begins after the
// cypher key
(Key + (keySizeUnderlying/8)),
0,
lrw
)) != CRYPT_OK)
{
status = STATUS_UNSUCCESSFUL;
DEBUGOUTCYPHERIMPL(DEBUGLEV_ERROR, (TEXT("Unable to start LRW session (errnum: %d)\n"), errnum));
}
else
{
if (encryptNotDecrypt)
{
if ((errnum = lrw_encrypt(
InData,
OutData,
InLength,
lrw
)) != CRYPT_OK)
{
DEBUGOUTCYPHERIMPL(DEBUGLEV_ERROR, (TEXT("Unable to encrypt block (errnum: %d)\n"), errnum));
status = STATUS_UNSUCCESSFUL;
}
}
else
{
if ((errnum = lrw_decrypt(
InData,
OutData,
InLength,
lrw
)) != CRYPT_OK)
{
DEBUGOUTCYPHERIMPL(DEBUGLEV_ERROR, (TEXT("Unable to decrypt block (errnum: %d)\n"), errnum));
status = STATUS_UNSUCCESSFUL;
}
}
lrw_done(lrw);
}
SecZeroMemory(lrw, sizeof(symmetric_LRW));
FREEOTFE_FREE(lrw);
break;
}
case CYPHER_MODE_XTS:
{
xts = FREEOTFE_MEMALLOC(sizeof(symmetric_xts));
FREEOTFE_MEMZERO(xts, sizeof(symmetric_xts));
// Generate index in correct format
// XTS uses:
// *) The sector index (i.e. the number of N-bit sectors)
// *) The first sector is sector 0
// *) Littleendian format
LARGE_INTEGER__To__INTEGER_128_LittleEndian(
SectorID,
blockID128
);
// Start an XTS session
if ((errnum = xts_start(
cipher,
Key,
&(Key[keySizeUnderlying/8]),
(keySizeUnderlying/8),
0,
xts
)) != CRYPT_OK)
{
status = STATUS_UNSUCCESSFUL;
DEBUGOUTCYPHERIMPL(DEBUGLEV_ERROR, (TEXT("Unable to start XTS session (errnum: %d)\n"), errnum));
}
else
{
if (encryptNotDecrypt)
{
if ((errnum = xts_encrypt(
InData,
InLength,
OutData,
blockID128,
xts
)) != CRYPT_OK)
{
DEBUGOUTCYPHERIMPL(DEBUGLEV_ERROR, (TEXT("Unable to encrypt block (errnum: %d)\n"), errnum));
status = STATUS_UNSUCCESSFUL;
}
}
else
{
if ((errnum = xts_decrypt(
InData,
InLength,
OutData,
blockID128,
xts
)) != CRYPT_OK)
{
DEBUGOUTCYPHERIMPL(DEBUGLEV_ERROR, (TEXT("Unable to decrypt block (errnum: %d)\n"), errnum));
status = STATUS_UNSUCCESSFUL;
}
}
xts_done(xts);
}
SecZeroMemory(xts, sizeof(symmetric_xts));
FREEOTFE_FREE(xts);
break;
}
}
}
DEBUGOUTCYPHERIMPL(DEBUGLEV_EXIT, (TEXT("ImpCypherDecryptData\n")));
return status;
}
