138 lines
7.1 KiB
C#
138 lines
7.1 KiB
C#
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#region PDFsharp - A .NET library for processing PDF
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//
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// Authors:
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// Stefan Lange
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//
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// Copyright (c) 2005-2017 empira Software GmbH, Cologne Area (Germany)
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//
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// http://www.pdfsharp.com
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// http://sourceforge.net/projects/pdfsharp
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the "Software"),
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// to deal in the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included
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// in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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#endregion
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// ReSharper disable InconsistentNaming
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namespace PdfSharp.Pdf.Security
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{
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/// <summary>
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/// Represents the base of all security handlers.
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/// </summary>
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public abstract class PdfSecurityHandler : PdfDictionary
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{
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internal PdfSecurityHandler(PdfDocument document)
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: base(document)
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{ }
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internal PdfSecurityHandler(PdfDictionary dict)
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: base(dict)
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{ }
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/// <summary>
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/// Predefined keys of this dictionary.
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/// </summary>
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internal class Keys : KeysBase
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{
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/// <summary>
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/// (Required) The name of the preferred security handler for this document. Typically,
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/// it is the name of the security handler that was used to encrypt the document. If
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/// SubFilter is not present, only this security handler should be used when opening
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/// the document. If it is present, consumer applications can use any security handler
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/// that implements the format specified by SubFilter.
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/// Standard is the name of the built-in password-based security handler. Names for other
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/// security handlers can be registered by using the procedure described in Appendix E.
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/// </summary>
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[KeyInfo(KeyType.Name | KeyType.Required)]
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public const string Filter = "/Filter";
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/// <summary>
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/// (Optional; PDF 1.3) A name that completely specifies the format and interpretation of
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/// the contents of the encryption dictionary. It is needed to allow security handlers other
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/// than the one specified by Filter to decrypt the document. If this entry is absent, other
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/// security handlers should not be allowed to decrypt the document.
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/// </summary>
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[KeyInfo("1.3", KeyType.Name | KeyType.Optional)]
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public const string SubFilter = "/SubFilter";
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/// <summary>
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/// (Optional but strongly recommended) A code specifying the algorithm to be used in encrypting
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/// and decrypting the document:
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/// 0 An algorithm that is undocumented and no longer supported, and whose use is strongly discouraged.
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/// 1 Algorithm 3.1, with an encryption key length of 40 bits.
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/// 2 (PDF 1.4) Algorithm 3.1, but permitting encryption key lengths greater than 40 bits.
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/// 3 (PDF 1.4) An unpublished algorithm that permits encryption key lengths ranging from 40 to 128 bits.
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/// 4 (PDF 1.5) The security handler defines the use of encryption and decryption in the document, using
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/// the rules specified by the CF, StmF, and StrF entries.
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/// The default value if this entry is omitted is 0, but a value of 1 or greater is strongly recommended.
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/// </summary>
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[KeyInfo(KeyType.Integer | KeyType.Optional)]
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public const string V = "/V";
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/// <summary>
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/// (Optional; PDF 1.4; only if V is 2 or 3) The length of the encryption key, in bits.
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/// The value must be a multiple of 8, in the range 40 to 128. Default value: 40.
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/// </summary>
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[KeyInfo("1.4", KeyType.Integer | KeyType.Optional)]
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public const string Length = "/Length";
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/// <summary>
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/// (Optional; meaningful only when the value of V is 4; PDF 1.5)
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/// A dictionary whose keys are crypt filter names and whose values are the corresponding
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/// crypt filter dictionaries. Every crypt filter used in the document must have an entry
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/// in this dictionary, except for the standard crypt filter names.
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/// </summary>
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[KeyInfo(KeyType.Dictionary | KeyType.Optional)]
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public const string CF = "/CF";
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/// <summary>
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/// (Optional; meaningful only when the value of V is 4; PDF 1.5)
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/// The name of the crypt filter that is used by default when decrypting streams.
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/// The name must be a key in the CF dictionary or a standard crypt filter name. All streams
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/// in the document, except for cross-reference streams or streams that have a Crypt entry in
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/// their Filter array, are decrypted by the security handler, using this crypt filter.
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/// Default value: Identity.
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/// </summary>
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[KeyInfo("1.5", KeyType.Name | KeyType.Optional)]
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public const string StmF = "/StmF";
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/// <summary>
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/// (Optional; meaningful only when the value of V is 4; PDF 1.)
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/// The name of the crypt filter that is used when decrypting all strings in the document.
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/// The name must be a key in the CF dictionary or a standard crypt filter name.
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/// Default value: Identity.
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/// </summary>
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[KeyInfo("1.5", KeyType.Name | KeyType.Optional)]
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public const string StrF = "/StrF";
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/// <summary>
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/// (Optional; meaningful only when the value of V is 4; PDF 1.6)
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/// The name of the crypt filter that should be used by default when encrypting embedded
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/// file streams; it must correspond to a key in the CF dictionary or a standard crypt
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/// filter name. This entry is provided by the security handler. Applications should respect
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/// this value when encrypting embedded files, except for embedded file streams that have
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/// their own crypt filter specifier. If this entry is not present, and the embedded file
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/// stream does not contain a crypt filter specifier, the stream should be encrypted using
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/// the default stream crypt filter specified by StmF.
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/// </summary>
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[KeyInfo("1.6", KeyType.Name | KeyType.Optional)]
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public const string EFF = "/EFF";
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}
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}
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}
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