/// <summary> /// Add editing protection to this document. /// </summary> /// <param name="er">The type of protection to add to this document.</param> /// <example> /// <code> /// // Create a new document. /// using (DocX document = DocX.Create(@"Test.docx")) /// { /// // Allow no editing, only the adding of comment. /// document.AddProtection(EditRestrictions.comments); /// /// // Save the document. /// document.Save(); /// } /// </code> /// </example> /// <seealso cref="RemoveProtection"/> /// <seealso cref="GetProtectionType"/> /// <seealso cref="isProtected"/> public void AddProtection(EditRestrictions er) { // Call remove protection before adding a new protection element. RemoveProtection(); if (er == EditRestrictions.none) return; XElement documentProtection = new XElement(XName.Get("documentProtection", DocX.w.NamespaceName)); documentProtection.Add(new XAttribute(XName.Get("edit", DocX.w.NamespaceName), er.ToString())); documentProtection.Add(new XAttribute(XName.Get("enforcement", DocX.w.NamespaceName), "1")); settings.Root.AddFirst(documentProtection); }
public void AddProtection(EditRestrictions er, string strPassword) { // http://blogs.msdn.com/b/vsod/archive/2010/04/05/how-to-set-the-editing-restrictions-in-word-using-open-xml-sdk-2-0.aspx // Call remove protection before adding a new protection element. RemoveProtection(); if (er == EditRestrictions.none) return; XElement documentProtection = new XElement(XName.Get("documentProtection", w.NamespaceName)); documentProtection.Add(new XAttribute(XName.Get("edit", w.NamespaceName), er.ToString())); documentProtection.Add(new XAttribute(XName.Get("enforcement", w.NamespaceName), "1")); int[] InitialCodeArray = { 0xE1F0, 0x1D0F, 0xCC9C, 0x84C0, 0x110C, 0x0E10, 0xF1CE, 0x313E, 0x1872, 0xE139, 0xD40F, 0x84F9, 0x280C, 0xA96A, 0x4EC3 }; int[,] EncryptionMatrix = new int[15, 7] { /* char 1 */ {0xAEFC, 0x4DD9, 0x9BB2, 0x2745, 0x4E8A, 0x9D14, 0x2A09}, /* char 2 */ {0x7B61, 0xF6C2, 0xFDA5, 0xEB6B, 0xC6F7, 0x9DCF, 0x2BBF}, /* char 3 */ {0x4563, 0x8AC6, 0x05AD, 0x0B5A, 0x16B4, 0x2D68, 0x5AD0}, /* char 4 */ {0x0375, 0x06EA, 0x0DD4, 0x1BA8, 0x3750, 0x6EA0, 0xDD40}, /* char 5 */ {0xD849, 0xA0B3, 0x5147, 0xA28E, 0x553D, 0xAA7A, 0x44D5}, /* char 6 */ {0x6F45, 0xDE8A, 0xAD35, 0x4A4B, 0x9496, 0x390D, 0x721A}, /* char 7 */ {0xEB23, 0xC667, 0x9CEF, 0x29FF, 0x53FE, 0xA7FC, 0x5FD9}, /* char 8 */ {0x47D3, 0x8FA6, 0x0F6D, 0x1EDA, 0x3DB4, 0x7B68, 0xF6D0}, /* char 9 */ {0xB861, 0x60E3, 0xC1C6, 0x93AD, 0x377B, 0x6EF6, 0xDDEC}, /* char 10 */ {0x45A0, 0x8B40, 0x06A1, 0x0D42, 0x1A84, 0x3508, 0x6A10}, /* char 11 */ {0xAA51, 0x4483, 0x8906, 0x022D, 0x045A, 0x08B4, 0x1168}, /* char 12 */ {0x76B4, 0xED68, 0xCAF1, 0x85C3, 0x1BA7, 0x374E, 0x6E9C}, /* char 13 */ {0x3730, 0x6E60, 0xDCC0, 0xA9A1, 0x4363, 0x86C6, 0x1DAD}, /* char 14 */ {0x3331, 0x6662, 0xCCC4, 0x89A9, 0x0373, 0x06E6, 0x0DCC}, /* char 15 */ {0x1021, 0x2042, 0x4084, 0x8108, 0x1231, 0x2462, 0x48C4} }; // Generate the Salt byte[] arrSalt = new byte[16]; RandomNumberGenerator rand = new RNGCryptoServiceProvider(); rand.GetNonZeroBytes(arrSalt); //Array to hold Key Values byte[] generatedKey = new byte[4]; //Maximum length of the password is 15 chars. int intMaxPasswordLength = 15; if (!String.IsNullOrEmpty(strPassword)) { strPassword = strPassword.Substring(0, Math.Min(strPassword.Length, intMaxPasswordLength)); byte[] arrByteChars = new byte[strPassword.Length]; for (int intLoop = 0; intLoop < strPassword.Length; intLoop++) { int intTemp = Convert.ToInt32(strPassword[intLoop]); arrByteChars[intLoop] = Convert.ToByte(intTemp & 0x00FF); if (arrByteChars[intLoop] == 0) arrByteChars[intLoop] = Convert.ToByte((intTemp & 0xFF00) >> 8); } int intHighOrderWord = InitialCodeArray[arrByteChars.Length - 1]; for (int intLoop = 0; intLoop < arrByteChars.Length; intLoop++) { int tmp = intMaxPasswordLength - arrByteChars.Length + intLoop; for (int intBit = 0; intBit < 7; intBit++) { if ((arrByteChars[intLoop] & (0x0001 << intBit)) != 0) { intHighOrderWord ^= EncryptionMatrix[tmp, intBit]; } } } int intLowOrderWord = 0; // For each character in the strPassword, going backwards for (int intLoopChar = arrByteChars.Length - 1; intLoopChar >= 0; intLoopChar--) { intLowOrderWord = (((intLowOrderWord >> 14) & 0x0001) | ((intLowOrderWord << 1) & 0x7FFF)) ^ arrByteChars[intLoopChar]; } intLowOrderWord = (((intLowOrderWord >> 14) & 0x0001) | ((intLowOrderWord << 1) & 0x7FFF)) ^ arrByteChars.Length ^ 0xCE4B; // Combine the Low and High Order Word int intCombinedkey = (intHighOrderWord << 16) + intLowOrderWord; // The byte order of the result shall be reversed [Example: 0x64CEED7E becomes 7EEDCE64. end example], // and that value shall be hashed as defined by the attribute values. for (int intTemp = 0; intTemp < 4; intTemp++) { generatedKey[intTemp] = Convert.ToByte(((uint)(intCombinedkey & (0x000000FF << (intTemp * 8)))) >> (intTemp * 8)); } } StringBuilder sb = new StringBuilder(); for (int intTemp = 0; intTemp < 4; intTemp++) { sb.Append(Convert.ToString(generatedKey[intTemp], 16)); } generatedKey = Encoding.Unicode.GetBytes(sb.ToString().ToUpper()); byte[] tmpArray1 = generatedKey; byte[] tmpArray2 = arrSalt; byte[] tempKey = new byte[tmpArray1.Length + tmpArray2.Length]; Buffer.BlockCopy(tmpArray2, 0, tempKey, 0, tmpArray2.Length); Buffer.BlockCopy(tmpArray1, 0, tempKey, tmpArray2.Length, tmpArray1.Length); generatedKey = tempKey; int iterations = 100000; HashAlgorithm sha1 = new SHA1Managed(); generatedKey = sha1.ComputeHash(generatedKey); byte[] iterator = new byte[4]; for (int intTmp = 0; intTmp < iterations; intTmp++) { iterator[0] = Convert.ToByte((intTmp & 0x000000FF) >> 0); iterator[1] = Convert.ToByte((intTmp & 0x0000FF00) >> 8); iterator[2] = Convert.ToByte((intTmp & 0x00FF0000) >> 16); iterator[3] = Convert.ToByte((intTmp & 0xFF000000) >> 24); generatedKey = concatByteArrays(iterator, generatedKey); generatedKey = sha1.ComputeHash(generatedKey); } documentProtection.Add(new XAttribute(XName.Get("cryptProviderType", w.NamespaceName), "rsaFull")); documentProtection.Add(new XAttribute(XName.Get("cryptAlgorithmClass", w.NamespaceName), "hash")); documentProtection.Add(new XAttribute(XName.Get("cryptAlgorithmType", w.NamespaceName), "typeAny")); documentProtection.Add(new XAttribute(XName.Get("cryptAlgorithmSid", w.NamespaceName), "4")); // SHA1 documentProtection.Add(new XAttribute(XName.Get("cryptSpinCount", w.NamespaceName), iterations.ToString())); documentProtection.Add(new XAttribute(XName.Get("hash", w.NamespaceName), Convert.ToBase64String(generatedKey))); documentProtection.Add(new XAttribute(XName.Get("salt", w.NamespaceName), Convert.ToBase64String(arrSalt))); settings.Root.AddFirst(documentProtection); }