Walter.Cypher 2023.5.30.1640

The ID prefix of this package has been reserved for one of the owners of this package by NuGet.org. Prefix Reserved
.NET 6.0 .NET Core 3.1 .NET Standard 2.1
There is a newer version of this package available.
See the version list below for details. 
dotnet add package Walter.Cypher --version 2023.5.30.1640
NuGet\Install-Package Walter.Cypher -Version 2023.5.30.1640
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package. 
<PackageReference Include="Walter.Cypher" Version="2023.5.30.1640" />
For projects that support PackageReference, copy this XML node into the project file to reference the package. 
paket add Walter.Cypher --version 2023.5.30.1640
#r "nuget: Walter.Cypher, 2023.5.30.1640"
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package. 
// Install Walter.Cypher as a Cake Addin
#addin nuget:?package=Walter.Cypher&version=2023.5.30.1640

// Install Walter.Cypher as a Cake Tool
#tool nuget:?package=Walter.Cypher&version=2023.5.30.1640

The cypher package for hashing data in a convenient and secure way as well as symmetric and asymmetric encryption methods. You can find On-line documentation at https://cypherapi.asp-waf.com/ as well as using the sample code found at https://github.com/ASP-WAF/Cypher

Cypher ICON Walter.Cypher

This repository shows how you can use the Walter.Cypher NuGet package in your code using little code snippets.

Walter.Web.CypherTests sample code

This sample code shows the use of

  1. Fixed cypher using a password to protect your code.
  2. Generating checksum for tamper detection.
  3. PGP using various key strengths to protect data
  4. The use of Numeric encryption that can be used to defeat base64 scanning tools to detect cyphered constants for password probing as values can be stored in int64 type values

Get Started

Show how to cipher large amounts of text using the Crypto class


[TestMethod()]
public void CipherZip()
{
    var sb = new StringBuilder();
    for (var i = 0; i < 1024; i++)
    {
        sb.Append(DateTime.Now.ToString());
    }
    var test = sb.ToString();

    var cypkered = Crypto.Zip(test);
    var expect = Crypto.UnZip(cypkered);
    Assert.AreEqual(test, expect);
}

Alternatively you can use the extension method

[TestMethod()]
public void CypherExtesnionTest()
{
    var testpw = "65654616540546546";
    var cypher = Environment.MachineName.Encrypt(testpw);
    var clear = cypher.Decrypt(testpw);

    Assert.AreEqual(Environment.MachineName, clear);
}

The extension method for cypher also allow encryption using public/private key encryption using certificates for text of any length

[TestMethod]
public void TestSmallStringAsBytes()
{
    using X509Certificate2 encryptCertificate = GetCert(".cer");
    using X509Certificate2 decryptCertificate = GetCert(".pfx", "01234456");

    var certCypher = Environment.MachineName.AsEncryptedBytes(encryptCertificate);
    var clearBytes = certCypher.AsDecryptFromBytes(decryptCertificate);

    Assert.AreEqual(Environment.MachineName, UTF8Encoding.UTF8.GetString(clearBytes));

    // helper method load embedded test certificate resource from assembly
    static X509Certificate2 GetCert(string extension, string password = null)
    {
        var asam = Assembly.GetExecutingAssembly();
        using (var memory = new MemoryStream())
        using (var stream = asam.GetManifestResourceStream(asam.GetManifestResourceNames().First(f => f.EndsWith(extension))))
        {
            stream.CopyTo(memory);
            return new X509Certificate2(memory.ToArray(), password);
        }
    }
}

[TestMethod]
public void TestLargeStringAsBytes()
{
    using X509Certificate2 encryptCertificate = GetCert(".cer");
    using X509Certificate2 cecryptCertificate = GetCert(".pfx","01234456");

    var sb = new StringBuilder();
    for (int i = 0; i < 100; i++)
    {
        sb.Append(Guid.NewGuid());
    }
    var text = sb.ToString();

    var certCypher = text.AsEncryptedBytes(encryptCertificate);
    Assert.AreNotEqual(certCypher.Length, text.Length);

    var clearBytes = certCypher.AsDecryptFromBytes(cecryptCertificate);
    Assert.AreEqual(text, UTF8Encoding.UTF8.GetString(clearBytes));

    X509Certificate2 GetCert(string extension, string password = null)
    {
        var asam = Assembly.GetExecutingAssembly();
        using (var memory = new MemoryStream())
        using (var stream = asam.GetManifestResourceStream(asam.GetManifestResourceNames().First(f => f.EndsWith(extension))))
        {
            stream!.CopyTo(memory);
            return new X509Certificate2(memory.ToArray(), password);
        }
    }
}

You also have the possibility to encrypt and decrypt persisted text based on the hosting machine, user executing the application, the application or process name this feature works on all platforms that support where that support the concept of users, processes and machine names in .NET and is ideal for storing secure data in memory that should not be possible to access when creating an application dump file but should survive a reboot.

There are some limitations on some IOT devices that might prevent you from using these features

public void RoundTrip_EncryptionScope_Process()
{
    var sb = new StringBuilder();
    for (int i = 0; i < 100; i++)
    {
        sb.Append(Guid.NewGuid());
    }
    var text = sb.ToString();

    var certCypher = text.AsEncryptedBytes(scope: EncryptionScope.Process);
    Assert.AreNotEqual(certCypher.Length, text.Length);

    var clearText = certCypher.AsDecryptFromBytes(scope: EncryptionScope.Process);
    Assert.AreEqual(text, clearText);

}

[TestMethod()]
public void RoundTrip_EncryptionScope_User()
{
    var sb = new StringBuilder();
    for (int i = 0; i < 100; i++)
    {
        sb.Append(Guid.NewGuid());
    }
    var text = sb.ToString();

    var certCypher = text.AsEncryptedBytes(scope: EncryptionScope.User);
    Assert.AreNotEqual(certCypher.Length, text.Length);

    var clearText = certCypher.AsDecryptFromBytes(scope: EncryptionScope.User);
    Assert.AreEqual(text, clearText);
}

[TestMethod()]
public void RoundTrip_EncryptionScope_Machine()
{
    var sb = new StringBuilder();
    for (int i = 0; i < 100; i++)
    {
        sb.Append(Guid.NewGuid());
    }
    var text = sb.ToString();

    var certCypher = text.AsEncryptedBytes(scope: EncryptionScope.Machine);
    Assert.AreNotEqual(certCypher.Length, text.Length);

    var clearText = certCypher.AsDecryptFromBytes(scope: EncryptionScope.Machine);
    Assert.AreEqual(text, clearText);
}
Product Compatible and additional computed target framework versions.
.NET net5.0 was computed.  net5.0-windows was computed.  net6.0 is compatible.  net6.0-android was computed.  net6.0-ios was computed.  net6.0-maccatalyst was computed.  net6.0-macos was computed.  net6.0-tvos was computed.  net6.0-windows was computed.  net7.0 is compatible.  net7.0-android was computed.  net7.0-ios was computed.  net7.0-maccatalyst was computed.  net7.0-macos was computed.  net7.0-tvos was computed.  net7.0-windows was computed. 
.NET Core netcoreapp3.0 was computed.  netcoreapp3.1 is compatible. 
.NET Standard netstandard2.1 is compatible. 
MonoAndroid monoandroid was computed. 
MonoMac monomac was computed. 
MonoTouch monotouch was computed. 
Tizen tizen60 was computed. 
Xamarin.iOS xamarinios was computed. 
Xamarin.Mac xamarinmac was computed. 
Xamarin.TVOS xamarintvos was computed. 
Xamarin.WatchOS xamarinwatchos was computed. 
Compatible target framework(s)
Additional computed target framework(s)
Learn more about Target Frameworks and .NET Standard.

NuGet packages (1)

Showing the top 1 NuGet packages that depend on Walter.Cypher:

Package Downloads
Walter.BOM The ID prefix of this package has been reserved for one of the owners of this package by NuGet.org.

Internal NuGet package with business objects used by several ASP-WAF products Documentation available at https://firewallapi.asp-waf.com/?topic=html/N-Walter.BOM.htm

GitHub repositories

This package is not used by any popular GitHub repositories.

Version Downloads Last updated
2023.9.14.812 157 9/14/2023
2023.8.29.1040 1,033 8/29/2023
2023.8.17.903 346 8/17/2023
2023.8.9.1314 425 8/9/2023
2023.8.2.750 510 8/2/2023
2023.7.12.830 551 7/12/2023
2023.7.5.1419 655 7/6/2023
2023.6.14.1628 1,189 6/14/2023
2023.5.30.1640 1,010 5/30/2023
2023.5.4.1552 1,113 5/4/2023
2023.4.12.1236 3,203 4/12/2023
2023.3.14.1356 2,817 3/14/2023
2023.3.1.810 1,725 3/1/2023
2023.2.25.1185 529 2/25/2023
2023.2.22.27 2,959 2/22/2023
2023.2.15.1413 1,876 2/15/2023
2023.2.11.1628 1,865 2/11/2023
2023.1.11.534 2,122 1/11/2023
2022.12.14.648 8,391 12/14/2022
2022.11.27.1059 2,556 11/27/2022
2022.11.21.338 2,658 11/21/2022
2022.11.14.1819 2,841 11/14/2022
2022.11.14.1533 497 11/14/2022
2022.11.13.917 3,312 11/13/2022
2022.10.31.740 5,378 11/1/2022
2022.10.15.652 5,705 10/15/2022
2022.10.1.810 7,158 10/1/2022
2022.9.26.1444 7,885 9/26/2022
2022.9.14.809 6,892 9/14/2022
2022.9.8.1009 13,308 9/8/2022
2022.8.20.1007 7,060 8/20/2022
2022.8.1.1 7,307 7/31/2022
2022.7.15.841 13,787 7/15/2022
2022.7.1.1300 7,370 7/1/2022
2022.6.21.647 7,321 6/21/2022
2022.5.4.1010 27,317 5/4/2022
2022.4.10.828 22,260 4/10/2022
2022.3.26.1117 22,214 3/26/2022
2022.2.11.931 39,024 2/17/2022
2022.1.15.1312 16,107 1/17/2022
2022.1.10.537 15,175 1/10/2022
2022.1.7.1357 6,927 1/8/2022
2021.12.28.1452 8,326 12/28/2021
2021.12.15.911 7,616 12/16/2021
2021.11.19.850 29,270 11/19/2021
2021.11.11.1334 23,540 11/16/2021
2021.11.8.2109 6,348 11/9/2021
2021.11.8.1612 6,913 11/8/2021
2021.10.23.1310 39,597 10/25/2021
2021.10.13.1459 7,247 10/18/2021
2021.10.9.821 384 10/10/2021
2021.9.26.1913 50,399 9/26/2021
2021.9.17.1702 11,581 9/18/2021
2021.8.30.1319 73,340 8/30/2021
2021.8.14.1600 40,115 8/16/2021
2021.8.14.829 4,263 8/14/2021
2021.8.8.1612 13,869 8/8/2021
2021.8.8.1138 365 8/8/2021
2021.7.22.1044 48,132 7/23/2021
2021.7.15.1547 7,210 7/15/2021
2021.7.12.734 7,138 7/13/2021
2021.6.26.1753 28,093 6/27/2021
2021.6.23.734 14,325 6/24/2021
2021.6.19.803 7,729 6/20/2021
2021.6.11.1600 28,111 6/13/2021
2021.6.9.1120 7,302 6/9/2021
2021.6.7.1407 1,964 6/7/2021
2021.5.28.1533 13,806 5/31/2021
2021.5.28.1451 7,271 5/31/2021
2021.5.25.1732 6,391 5/25/2021
2021.5.12.929 23,504 5/12/2021
2021.5.12.914 343 5/12/2021
2021.5.12.637 3,809 5/12/2021
2021.5.5.1901 23,563 5/6/2021
2021.5.2.1617 6,938 5/4/2021
2021.5.1.1505 7,156 5/1/2021
2021.4.28.1505 6,968 4/28/2021
2021.4.5.1653 46,992 4/5/2021
2021.4.1.913 7,087 4/1/2021
2021.3.31.1630 7,000 4/1/2021
2021.3.18.1608 7,420 3/18/2021
2021.3.3.1295 422 3/3/2021
2021.3.3.835 431 3/3/2021
2021.3.1.1205 18,344 3/2/2021
2021.3.1.1 12,858 2/27/2021
2021.2.21.1 12,354 2/21/2021
2021.2.19.3 6,633 2/20/2021
2021.2.19.2 6,367 2/19/2021
2021.2.18.2 5,879 2/19/2021
2021.2.18.1 387 2/19/2021
2021.2.16.1 12,845 2/16/2021
2021.2.10.1 29,395 2/10/2021
2021.2.9.1 5,292 2/9/2021
2021.2.8.1 414 2/9/2021
2021.2.7.1 10,445 2/6/2021
2020.12.27.1 9,937 12/27/2020
2020.12.26.3 14,036 12/27/2020
2020.12.26.2 436 12/27/2020
2020.12.24.2 465 12/26/2020
2020.12.24.1 419 12/24/2020
2020.12.18.1 5,585 12/19/2020
2020.12.15.1 10,075 12/15/2020
2020.12.14.5 9,278 12/14/2020
2020.12.14.4 5,251 12/14/2020
2020.12.14.3 5,014 12/14/2020
2020.11.27.1 52,728 11/27/2020
2020.11.25.1 9,774 11/25/2020
2020.11.23.1 432 11/25/2020
2020.11.22.2 6,649 11/23/2020
2020.11.20.1 6,016 11/21/2020
2020.11.19.3 6,078 11/19/2020
2020.11.11.1 48,567 11/11/2020
2020.10.9.5 105,746 10/9/2020
2020.10.5.1 53,045 10/5/2020
2020.10.4.1 474 10/4/2020
2020.10.1.1 13,697 10/1/2020
2020.9.24.2 17,221 9/24/2020
2020.9.12.1 36,302 9/12/2020
2020.9.8 12,107 9/8/2020
2020.9.6.5 3,604 9/6/2020
2020.9.6.4 473 9/6/2020
2020.9.6.2 1,628 9/6/2020
2020.9.3.1 9,660 9/3/2020

5 May 2023
- Update due to new Obfuscation tool update

14 Mar 2023
- AddUpdate to latest Netwonsof t Json

22 Feb 2023
- Axel Imani Release (Go live)

15 February 2023
- Update to .net 6.0.406  and 7.0.3

11 January 2023
- update to 7.0.2, 6.0.13 SDK and build tools for 17.4.4
- An SP for .net 3.1 was not provided by Microsoft at this time, we recommend migration away from 3.1 asap

14 December 2022
- Update to .Net SDK 3.1.426, 6.0.404 and 7.0.101

27 November 2022
- update package references

21 November 2022
- update to link NuGet changes .net 7.0

14 November 2022
- Update NuGet Packages
- Link with .Net 7

13 November 2022
- Update NuGet packages
- Remove support for pre-.net 6.0


7 November 2022
- Update to support .net 7

31 October 2022
- Update to build with new SDK

1 October 2022
- Update code sign certificate
- Update SDK build


14 September 2022
- Update to include new package 6.0.2 and Microsoft CVE-2022-38013

1 September 2022
- Update MS build

9 August 2022
- update to SDK 6.0.400 / .Net 6.0.8 security patch
- drop support for .net standard 2.0
- drop support for .net 5.0

15 June 2022
- Update to support .net 6.0.7 and 3.1.27

26 March 2022
- Update NuGet package references

27 December 2021
- Enable Numeric cypher for .net 6.0


15 December 2021
- Update package references as well as .Net DSK release December 14 2021

11 December 2021
- Add extension method to encrypt using PGP RSA for Strings to byte[] and back

6 December 2021
- Add several extensions to the encryption extension helper method including certificate encryption/ decryption

9 November 2021
- Fix package dependency on vulnerable packages from Microsoft by upgrading vulnerable packages

8 November 2021
- Update to Microsoft packages 6.0.0, 5.0.403 and core 3.1.415

11 October 2021
- CodeSign the binaries as well as the NuGet package for executing in a trust-platform


17 September 2021
- Update NuGet Packages to the new release

14 August 2021
- Update NuGet package dependencies

8 Aug 2021
- update to .NET 6.0 SDK (v6.0.100-preview.6)

22 June 2021
- Change cypher methods to use the core types and not the managed types to be compatible with .Net 6.0
- Include .Net 6.0 output

15 June 2021
- Update to .Net core 3.1.17 and :net 5.0.8
.
19 June 2021
- Update package reference external dependencies

25 May 2021
- Update package reference external dependencies

25 April 2021
- Update Package references

21 March 2021
- Update Package references

06 March 2021
- Update Package references
- Extend PGP allow export and import key
- Add static method for PGPManaged

01 February 2021
- Update Package references

18 February 2021
- Add session PGP keyring support in PGPKeyGenerator (less secure for memory based attacks when a malicious user has access to the device)

10 February 2021
- Update package references
- Add logging interface for extracting calling file name when faced with cypher errors

30 January 2021
- Update speed improvement
- Update package references

25 January 2021
- Update extension methods
- Update Package references

02 January 2021
- Updated license terms
- Update Package references

24 December 2020
- Update Package references
- Remove support for .net48

15 December 2020
- Update Package references

19 November 2020
1. Update package references

11 November 2020
1. Update package and add support for .net 5.0

09 October 2020
1. package update

24 September 2020
1. Update package references

06  September 2020
1. Set platform x64
2. Update NuGet Package References

26 August 2020
1. Update dependency on NuGet packages

12 August 2020 release
1. Update dependency on NuGet packages

13 June 2020 release
1. Update exception reporting
2. Update obfuscation settings to include file and line numbers

11 June 2020 release
1. Add Ticket service for incident reporting when the TicketService.ExceptionReporting is set to true (default false)

2020.6.10.
1. Update NuGet package License Manager

2020.06.01. version contains
1. Password based encryption
2. Secured compressed data
3. Asymmetric public, private data protection using key-rings with public and private key

Probing cipher keys using exceptions are disabled by re-throwing exceptions removing the details that are used by attack vectors.

Bugs fixed:
1. Saving >4gb data is now supported