int
_libssh2_wincng_cipher_crypt(_libssh2_cipher_ctx *ctx,
_libssh2_cipher_type(type),
int encrypt,
unsigned char *block,
size_t blocklen)
{
unsigned char *pbOutput;
unsigned long cbOutput, cbInput;
int ret;
(void)type;
cbInput = (unsigned long)blocklen;
if (encrypt) {
ret = BCryptEncrypt(ctx->hKey, block, cbInput, NULL,
ctx->pbIV, ctx->dwIV, NULL, 0, &cbOutput, 0);
} else {
ret = BCryptDecrypt(ctx->hKey, block, cbInput, NULL,
ctx->pbIV, ctx->dwIV, NULL, 0, &cbOutput, 0);
}
if (BCRYPT_SUCCESS(ret)) {
pbOutput = malloc(cbOutput);
if (pbOutput) {
if (encrypt) {
ret = BCryptEncrypt(ctx->hKey, block, cbInput, NULL,
ctx->pbIV, ctx->dwIV,
pbOutput, cbOutput, &cbOutput, 0);
} else {
ret = BCryptDecrypt(ctx->hKey, block, cbInput, NULL,
ctx->pbIV, ctx->dwIV,
pbOutput, cbOutput, &cbOutput, 0);
}
if (BCRYPT_SUCCESS(ret)) {
memcpy(block, pbOutput, cbOutput);
}
free(pbOutput);
} else
ret = STATUS_NO_MEMORY;
}
return BCRYPT_SUCCESS(ret) ? 0 : -1;
}
static int
aes_ctr_encrypt_counter(archive_crypto_ctx *ctx)
{
NTSTATUS status;
ULONG result;
status = BCryptEncrypt(ctx->hKey, (PUCHAR)ctx->nonce, AES_BLOCK_SIZE,
NULL, NULL, 0, (PUCHAR)ctx->encr_buf, AES_BLOCK_SIZE,
&result, 0);
return BCRYPT_SUCCESS(status) ? 0 : -1;
}
int aes_transformkey(m0_kdbx_header_entry_t *hdr, uint8_t *tkey, size_t tkeylen)
{
BCRYPT_ALG_HANDLE aes = NULL;
BCRYPT_KEY_HANDLE key = NULL;
NTSTATUS status = 0;
DWORD len_ciphertext = 0,
tmp_len = 0,
key_objectlen = 0;
PBYTE key_object = NULL;
uint64_t rounds = 0;
// Open an algorithm handle.
status = BCryptOpenAlgorithmProvider(
&aes,
BCRYPT_AES_ALGORITHM,
NULL,
0);
if(!NT_SUCCESS(status)) {
printf("[!] Error 0x%x returned by BCryptOpenAlgorithmProvider\n", status);
goto cleanup;
}
// Calculate the size of the buffer to hold the KeyObject.
status = BCryptGetProperty(
aes,
BCRYPT_OBJECT_LENGTH,
(PBYTE)&key_objectlen,
sizeof(DWORD),
&tmp_len,
0);
if(!NT_SUCCESS(status)) {
printf("[!] Error 0x%x returned by BCryptGetProperty\n", status);
goto cleanup;
}
// Allocate the key object on the heap.
key_object = (PBYTE)HeapAlloc(GetProcessHeap(), 0, key_objectlen);
if(NULL == key_object) {
printf("[!] memory allocation failed\n");
goto cleanup;
}
status = BCryptSetProperty(
aes,
BCRYPT_CHAINING_MODE,
(PBYTE)BCRYPT_CHAIN_MODE_ECB,
sizeof(BCRYPT_CHAIN_MODE_ECB),
0);
if(!NT_SUCCESS(status)) {
printf("[!] Error 0x%x returned by BCryptSetProperty\n", status);
goto cleanup;
}
// Generate the key from supplied input key bytes.
status = BCryptGenerateSymmetricKey(
aes,
&key,
key_object,
key_objectlen,
hdr[TRANSFORMSEED].data,
hdr[TRANSFORMSEED].len,
0);
if(!NT_SUCCESS(status)) {
printf("[!] Error 0x%x returned by BCryptGenerateSymmetricKey\n", status);
goto cleanup;
}
status = BCryptEncrypt(
key,
tkey,
tkeylen,
NULL,
NULL,
0,
NULL,
0,
&len_ciphertext,
0);
if(!NT_SUCCESS(status)) {
printf("[!] Error 0x%x returned by BCryptEncrypt (calculate)\n", status);
goto cleanup;
}
for(rounds = 0; rounds < hdr[TRANSFORMROUNDS].qw; rounds++) {
status = BCryptEncrypt(
key,
tkey,
tkeylen,
NULL,
NULL,
0,
tkey,
tkeylen,
&tmp_len,
0);
if(!NT_SUCCESS(status)) {
printf("[!] Error 0x%x returned by BCryptEncrypt (encrypt)\n", status);
goto cleanup;
}
}
cleanup:
if(aes) {
BCryptCloseAlgorithmProvider(aes,0);
}
if (key) {
BCryptDestroyKey(key);
}
if(key_object) {
HeapFree(GetProcessHeap(), 0, key_object);
}
return status;
}
int
_libssh2_wincng_bignum_mod_exp(_libssh2_bn *r,
_libssh2_bn *a,
_libssh2_bn *p,
_libssh2_bn *m,
_libssh2_bn_ctx *bnctx)
{
BCRYPT_KEY_HANDLE hKey;
BCRYPT_RSAKEY_BLOB *rsakey;
unsigned char *key, *bignum;
unsigned long keylen, offset, length;
int ret;
(void)bnctx;
if (!r || !a || !p || !m)
return -1;
offset = sizeof(BCRYPT_RSAKEY_BLOB);
keylen = offset + p->length + m->length;
key = malloc(keylen);
if (!key)
return -1;
/* http://msdn.microsoft.com/library/windows/desktop/aa375531.aspx */
rsakey = (BCRYPT_RSAKEY_BLOB *)key;
rsakey->Magic = BCRYPT_RSAPUBLIC_MAGIC;
rsakey->BitLength = m->length * 8;
rsakey->cbPublicExp = p->length;
rsakey->cbModulus = m->length;
rsakey->cbPrime1 = 0;
rsakey->cbPrime2 = 0;
memcpy(key + offset, p->bignum, p->length);
offset += p->length;
memcpy(key + offset, m->bignum, m->length);
ret = BCryptImportKeyPair(_libssh2_wincng.hAlgRSA, NULL,
BCRYPT_RSAPUBLIC_BLOB, &hKey, key, keylen,
BCRYPT_NO_KEY_VALIDATION);
if (BCRYPT_SUCCESS(ret)) {
ret = BCryptEncrypt(hKey, a->bignum, a->length, NULL, NULL, 0,
NULL, 0, &length, BCRYPT_PAD_NONE);
if (BCRYPT_SUCCESS(ret)) {
if (!_libssh2_wincng_bignum_resize(r, length)) {
length = max(a->length, length);
bignum = malloc(length);
if (bignum) {
offset = length - a->length;
memset(bignum, 0, offset);
memcpy(bignum + offset, a->bignum, a->length);
ret = BCryptEncrypt(hKey, bignum, length, NULL, NULL, 0,
r->bignum, r->length, &offset,
BCRYPT_PAD_NONE);
free(bignum);
if (BCRYPT_SUCCESS(ret)) {
_libssh2_wincng_bignum_resize(r, offset);
}
} else
ret = STATUS_NO_MEMORY;
} else
ret = STATUS_NO_MEMORY;
}
BCryptDestroyKey(hKey);
}
free(key);
return BCRYPT_SUCCESS(ret) ? 0 : -1;
}
UINT SfDecryptPayload(
LPWSTR lpParameter
)
{
BOOL cond = FALSE, bSuccess = FALSE;
PBYTE cng_object, hashdata, decrypted, enc_data, extracted;
ULONG obj_sz, rlen, hdatasz, enc_data_size;
BCRYPT_ALG_HANDLE h_alg = NULL;
BCRYPT_HASH_HANDLE h_hash = NULL;
BCRYPT_KEY_HANDLE h_rc4key = NULL;
NTSTATUS status;
HANDLE pheap = NULL;
PIMAGE_FILE_HEADER fheader;
PVOID pdll = NULL;
WCHAR InputFile[MAX_PATH + 1], OutputFile[MAX_PATH + 1];
rlen = 0;
RtlSecureZeroMemory(InputFile, sizeof(InputFile));
GetCommandLineParam(lpParameter, 1, InputFile, MAX_PATH, &rlen);
if (rlen == 0) {
SfcuiPrintText(g_ConOut,
T_SFDECRYPTUSAGE,
g_ConsoleOutput, FALSE);
return (UINT)-1;
}
do {
rlen = 0;
GetCommandLineParam(lpParameter, 2, OutputFile, MAX_PATH, &rlen);
if (rlen == 0)
_strcpy(OutputFile, TEXT("out.bin"));
pdll = SfuCreateFileMappingNoExec(InputFile);
if (pdll == NULL)
break;
enc_data_size = 0;
enc_data = SfuQueryResourceData(2, pdll, &enc_data_size);
if (enc_data == NULL)
break;
fheader = &(RtlImageNtHeader(pdll)->FileHeader);
status = BCryptOpenAlgorithmProvider(&h_alg, BCRYPT_MD5_ALGORITHM, NULL, 0);
if (!NT_SUCCESS(status))
break;
obj_sz = 0;
rlen = 0;
status = BCryptGetProperty(h_alg, BCRYPT_OBJECT_LENGTH, (PUCHAR)&obj_sz, sizeof(obj_sz), &rlen, 0);
if (!NT_SUCCESS(status))
break;
hdatasz = 0;
rlen = 0;
status = BCryptGetProperty(h_alg, BCRYPT_HASH_LENGTH, (PUCHAR)&hdatasz, sizeof(hdatasz), &rlen, 0);
if (!NT_SUCCESS(status))
break;
pheap = HeapCreate(0, 0, 0);
if (pheap == NULL)
break;
cng_object = HeapAlloc(pheap, HEAP_ZERO_MEMORY, obj_sz);
if (cng_object == NULL)
break;
hashdata = HeapAlloc(pheap, HEAP_ZERO_MEMORY, hdatasz);
if (hashdata == NULL)
break;
status = BCryptCreateHash(h_alg, &h_hash, cng_object, obj_sz, NULL, 0, 0);
if (!NT_SUCCESS(status))
break;
status = BCryptHashData(h_hash, (PUCHAR)fheader, sizeof(IMAGE_FILE_HEADER), 0);
if (!NT_SUCCESS(status))
break;
status = BCryptFinishHash(h_hash, hashdata, hdatasz, 0);
if (!NT_SUCCESS(status))
break;
BCryptDestroyHash(h_hash);
BCryptCloseAlgorithmProvider(h_alg, 0);
HeapFree(pheap, 0, cng_object);
h_alg = NULL;
h_hash = NULL;
status = BCryptOpenAlgorithmProvider(&h_alg, BCRYPT_RC4_ALGORITHM, NULL, 0);
if (!NT_SUCCESS(status))
break;
obj_sz = 0;
rlen = 0;
status = BCryptGetProperty(h_alg, BCRYPT_OBJECT_LENGTH, (PUCHAR)&obj_sz, sizeof(obj_sz), &rlen, 0);
if (!NT_SUCCESS(status))
break;
cng_object = HeapAlloc(pheap, HEAP_ZERO_MEMORY, obj_sz);
if (cng_object == NULL)
break;
status = BCryptGenerateSymmetricKey(h_alg, &h_rc4key, cng_object, obj_sz, hashdata, hdatasz, 0);
if (!NT_SUCCESS(status))
break;
decrypted = HeapAlloc(pheap, HEAP_ZERO_MEMORY, enc_data_size);
if (decrypted == NULL)
break;
rlen = 0;
status = BCryptEncrypt(h_rc4key, enc_data, enc_data_size, NULL, NULL, 0, decrypted, enc_data_size, &rlen, 0);
if (!NT_SUCCESS(status))
break;
bSuccess = FALSE;
enc_data_size = rlen;
rlen = 0;
extracted = SfcabExtractMemory(decrypted, enc_data_size, &rlen);
if (extracted) {
if (SfuWriteBufferToFile(OutputFile, extracted, rlen, FALSE, FALSE) == rlen) {
bSuccess = TRUE;
}
LocalFree(extracted);
}
else {
//failed to extract, drop cab as is
if (SfuWriteBufferToFile(OutputFile, decrypted, enc_data_size, FALSE, FALSE) == enc_data_size) {
bSuccess = TRUE;
}
}
if (bSuccess) {
SfcuiPrintText(g_ConOut,
T_SFDECRYPTED,
g_ConsoleOutput, FALSE);
SfcuiPrintText(g_ConOut,
OutputFile,
g_ConsoleOutput, FALSE);
}
} while (cond);
if (bSuccess == FALSE) {
SfcuiPrintText(g_ConOut,
T_SFDECRYPTFAIL,
g_ConsoleOutput, FALSE);
}
if (h_rc4key != NULL)
BCryptDestroyKey(h_rc4key);
if (h_hash != NULL)
BCryptDestroyHash(h_hash);
if (h_alg != NULL)
BCryptCloseAlgorithmProvider(h_alg, 0);
if (pheap != NULL)
HeapDestroy(pheap);
if (pdll != 0)
NtUnmapViewOfSection(NtCurrentProcess(), (PVOID)pdll);
return 0;
}
