1 files changed, 153 insertions, 0 deletions
diff --git a/onlineupdate/source/update/common/pathhash.cxx b/onlineupdate/source/update/common/pathhash.cxx
new file mode 100644
index 000000000..67e53fa35
--- /dev/null
+++ b/onlineupdate/source/update/common/pathhash.cxx
@@ -0,0 +1,153 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifdef _WIN32
+#include <windows.h>
+#include <wincrypt.h>
+#include "pathhash.h"
+
+
+/**
+ * Converts a binary sequence into a hex string
+ *
+ * @param hash      The binary data sequence
+ * @param hashSize  The size of the binary data sequence
+ * @param hexString A buffer to store the hex string, must be of
+ *                  size 2 * @hashSize
+*/
+static void
+BinaryDataToHexString(const BYTE *hash, DWORD &hashSize,
+                      LPWSTR hexString)
+{
+    WCHAR *p = hexString;
+    for (DWORD i = 0; i < hashSize; ++i)
+    {
+        wsprintfW(p, L"%.2x", hash[i]);
+        p += 2;
+    }
+}
+
+/**
+ * Calculates an MD5 hash for the given input binary data
+ *
+ * @param  data     Any sequence of bytes
+ * @param  dataSize The number of bytes inside @data
+ * @param  hash     Output buffer to store hash, must be freed by the caller
+ * @param  hashSize The number of bytes in the output buffer
+ * @return TRUE on success
+*/
+static BOOL
+CalculateMD5(const char *data, DWORD dataSize,
+             BYTE **hash, DWORD &hashSize)
+{
+    HCRYPTPROV hProv = 0;
+    HCRYPTHASH hHash = 0;
+
+    if (!CryptAcquireContext(&hProv, nullptr, nullptr, PROV_RSA_FULL,
+                             CRYPT_VERIFYCONTEXT))
+    {
+        if (NTE_BAD_KEYSET != GetLastError())
+        {
+            return FALSE;
+        }
+
+        // Maybe it doesn't exist, try to create it.
+        if (!CryptAcquireContext(&hProv, nullptr, nullptr, PROV_RSA_FULL,
+                                 CRYPT_VERIFYCONTEXT | CRYPT_NEWKEYSET))
+        {
+            return FALSE;
+        }
+    }
+
+    if (!CryptCreateHash(hProv, CALG_MD5, 0, 0, &hHash))
+    {
+        return FALSE;
+    }
+
+    if (!CryptHashData(hHash, reinterpret_cast<const BYTE*>(data),
+                       dataSize, 0))
+    {
+        return FALSE;
+    }
+
+    DWORD dwCount = sizeof(DWORD);
+    if (!CryptGetHashParam(hHash, HP_HASHSIZE, (BYTE *)&hashSize,
+                           &dwCount, 0))
+    {
+        return FALSE;
+    }
+
+    *hash = new BYTE[hashSize];
+    ZeroMemory(*hash, hashSize);
+    if (!CryptGetHashParam(hHash, HP_HASHVAL, *hash, &hashSize, 0))
+    {
+        return FALSE;
+    }
+
+    if (hHash)
+    {
+        CryptDestroyHash(hHash);
+    }
+
+    if (hProv)
+    {
+        CryptReleaseContext(hProv,0);
+    }
+
+    return TRUE;
+}
+
+/**
+ * Converts a file path into a unique registry location for cert storage
+ *
+ * @param  filePath     The input file path to get a registry path from
+ * @param  registryPath A buffer to write the registry path to, must
+ *                      be of size in WCHARs MAX_PATH + 1
+ * @return TRUE if successful
+*/
+BOOL
+CalculateRegistryPathFromFilePath(const LPCWSTR filePath,
+                                  LPWSTR registryPath)
+{
+    size_t filePathLen = wcslen(filePath);
+    if (!filePathLen)
+    {
+        return FALSE;
+    }
+
+    // If the file path ends in a slash, ignore that character
+    if (filePath[filePathLen -1] == L'\\' ||
+            filePath[filePathLen - 1] == L'/')
+    {
+        filePathLen--;
+    }
+
+    // Copy in the full path into our own buffer.
+    // Copying in the extra slash is OK because we calculate the hash
+    // based on the filePathLen which excludes the slash.
+    // +2 to account for the possibly trailing slash and the null terminator.
+    WCHAR *lowercasePath = new WCHAR[filePathLen + 2];
+    memset(lowercasePath, 0, (filePathLen + 2) * sizeof(WCHAR));
+    wcsncpy(lowercasePath, filePath, filePathLen + 1);
+    _wcslwr(lowercasePath);
+
+    BYTE *hash;
+    DWORD hashSize = 0;
+    if (!CalculateMD5(reinterpret_cast<const char*>(lowercasePath),
+                      filePathLen * 2,
+                      &hash, hashSize))
+    {
+        delete[] lowercasePath;
+        return FALSE;
+    }
+    delete[] lowercasePath;
+
+    LPCWSTR baseRegPath = L"SOFTWARE\\LibreOffice\\MaintenanceService\\";
+    wcsncpy(registryPath, baseRegPath, MAX_PATH);
+    BinaryDataToHexString(hash, hashSize,
+                          registryPath + wcslen(baseRegPath));
+    delete[] hash;
+    return TRUE;
+}
+#endif