Walter.Cypher 2023.3.14.1356

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
dotnet add package Walter.Cypher --version 2023.3.14.1356
NuGet\Install-Package Walter.Cypher -Version 2023.3.14.1356
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="2023.3.14.1356" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add Walter.Cypher --version 2023.3.14.1356
#r "nuget: Walter.Cypher, 2023.3.14.1356"
#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=2023.3.14.1356

// Install Walter.Cypher as a Cake Tool
#tool nuget:?package=Walter.Cypher&version=2023.3.14.1356

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 Versions
.NET net5.0 net5.0-windows net6.0 net6.0-android net6.0-ios net6.0-maccatalyst net6.0-macos net6.0-tvos net6.0-windows net7.0 net7.0-android net7.0-ios net7.0-maccatalyst net7.0-macos net7.0-tvos net7.0-windows
.NET Core netcoreapp3.0 netcoreapp3.1
.NET Standard netstandard2.1
MonoAndroid monoandroid
MonoMac monomac
MonoTouch monotouch
Tizen tizen60
Xamarin.iOS xamarinios
Xamarin.Mac xamarinmac
Xamarin.TVOS xamarintvos
Xamarin.WatchOS xamarinwatchos
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
2023.3.14.1356 136 3/14/2023
2023.3.1.810 275 3/1/2023
2023.2.25.1185 135 2/25/2023
2023.2.22.27 537 2/22/2023
2023.2.15.1413 404 2/15/2023
2023.2.11.1628 446 2/11/2023
2023.1.11.534 694 1/11/2023
2022.12.14.648 3,350 12/14/2022
2022.11.27.1059 1,129 11/27/2022
2022.11.21.338 1,172 11/21/2022
2022.11.14.1819 1,331 11/14/2022
2022.11.14.1533 291 11/14/2022
2022.11.13.917 1,595 11/13/2022
2022.10.31.740 2,849 11/1/2022
2022.10.15.652 3,367 10/15/2022
2022.10.1.810 4,474 10/1/2022
2022.9.26.1444 5,045 9/26/2022
2022.9.14.809 4,328 9/14/2022
2022.9.8.1009 8,453 9/8/2022
2022.8.20.1007 4,487 8/20/2022
2022.8.1.1 4,822 7/31/2022
2022.7.15.841 9,007 7/15/2022
2022.7.1.1300 4,839 7/1/2022
2022.6.21.647 4,814 6/21/2022
2022.5.4.1010 18,642 5/4/2022
2022.4.10.828 15,348 4/10/2022
2022.3.26.1117 15,550 3/26/2022
2022.2.11.931 27,723 2/17/2022
2022.1.15.1312 11,622 1/17/2022
2022.1.10.537 11,010 1/10/2022
2022.1.7.1357 4,904 1/8/2022
2021.12.28.1452 6,151 12/28/2021
2021.12.15.911 5,614 12/16/2021
2021.11.19.850 22,651 11/19/2021
2021.11.11.1334 18,101 11/16/2021
2021.11.8.2109 4,539 11/9/2021
2021.11.8.1612 5,034 11/8/2021
2021.10.23.1310 29,627 10/25/2021
2021.10.13.1459 5,399 10/18/2021
2021.10.9.821 306 10/10/2021
2021.9.26.1913 38,598 9/26/2021
2021.9.17.1702 8,440 9/18/2021
2021.8.30.1319 55,687 8/30/2021
2021.8.14.1600 30,606 8/16/2021
2021.8.14.829 3,006 8/14/2021
2021.8.8.1612 10,384 8/8/2021
2021.8.8.1138 275 8/8/2021
2021.7.22.1044 36,184 7/23/2021
2021.7.15.1547 5,232 7/15/2021
2021.7.12.734 5,254 7/13/2021
2021.6.26.1753 21,337 6/27/2021
2021.6.23.734 10,735 6/24/2021
2021.6.19.803 5,778 6/20/2021
2021.6.11.1600 21,004 6/13/2021
2021.6.9.1120 5,333 6/9/2021
2021.6.7.1407 1,381 6/7/2021
2021.5.28.1533 10,204 5/31/2021
2021.5.28.1451 5,226 5/31/2021
2021.5.25.1732 4,643 5/25/2021
2021.5.12.929 17,203 5/12/2021
2021.5.12.914 264 5/12/2021
2021.5.12.637 2,682 5/12/2021
2021.5.5.1901 17,048 5/6/2021
2021.5.2.1617 5,076 5/4/2021
2021.5.1.1505 5,226 5/1/2021
2021.4.28.1505 4,992 4/28/2021
2021.4.5.1653 34,587 4/5/2021
2021.4.1.913 5,086 4/1/2021
2021.3.31.1630 5,053 4/1/2021
2021.3.18.1608 5,331 3/18/2021
2021.3.3.1295 347 3/3/2021
2021.3.3.835 332 3/3/2021
2021.3.1.1205 13,505 3/2/2021
2021.3.1.1 9,383 2/27/2021
2021.2.21.1 8,917 2/21/2021
2021.2.19.3 4,718 2/20/2021
2021.2.19.2 4,517 2/19/2021
2021.2.18.2 4,119 2/19/2021
2021.2.18.1 299 2/19/2021
2021.2.16.1 9,459 2/16/2021
2021.2.10.1 21,562 2/10/2021
2021.2.9.1 3,865 2/9/2021
2021.2.8.1 324 2/9/2021
2021.2.7.1 7,661 2/6/2021
2020.12.27.1 7,267 12/27/2020
2020.12.26.3 10,043 12/27/2020
2020.12.26.2 344 12/27/2020
2020.12.24.2 375 12/26/2020
2020.12.24.1 344 12/24/2020
2020.12.18.1 4,049 12/19/2020
2020.12.15.1 7,514 12/15/2020
2020.12.14.5 6,908 12/14/2020
2020.12.14.4 3,879 12/14/2020
2020.12.14.3 3,668 12/14/2020
2020.11.27.1 39,348 11/27/2020
2020.11.25.1 7,175 11/25/2020
2020.11.23.1 350 11/25/2020
2020.11.22.2 5,000 11/23/2020
2020.11.20.1 4,330 11/21/2020
2020.11.19.3 4,434 11/19/2020
2020.11.11.1 36,384 11/11/2020
2020.10.9.5 78,713 10/9/2020
2020.10.5.1 38,794 10/5/2020
2020.10.4.1 380 10/4/2020
2020.10.1.1 9,883 10/1/2020
2020.9.24.2 12,472 9/24/2020
2020.9.12.1 26,588 9/12/2020
2020.9.8 8,940 9/8/2020
2020.9.6.5 2,554 9/6/2020
2020.9.6.4 382 9/6/2020
2020.9.6.2 1,224 9/6/2020
2020.9.3.1 6,801 9/3/2020

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