dotnet add package ChaCha20BLAKE3 --version 3.0.0
NuGet\Install-Package ChaCha20BLAKE3 -Version 3.0.0
<PackageReference Include="ChaCha20BLAKE3" Version="3.0.0" />
paket add ChaCha20BLAKE3 --version 3.0.0
#r "nuget: ChaCha20BLAKE3, 3.0.0"
// Install ChaCha20BLAKE3 as a Cake Addin #addin nuget:?package=ChaCha20BLAKE3&version=3.0.0 // Install ChaCha20BLAKE3 as a Cake Tool #tool nuget:?package=ChaCha20BLAKE3&version=3.0.0
This library does several things for you:
- Derives a 256-bit encryption key and 256-bit MAC key based on the key and nonce.
- Supports additional data in the calculation of the authentication tag, unlike most Encrypt-then-MAC implementations.
- Appends the authentication tag to the ciphertext.
- Compares the authentication tags in constant time during decryption and only returns plaintext if they match.
- Offers access to an SIV implementation that does not take a nonce.
The popular AEADs in use today, such as (X)ChaCha20-Poly1305, AES-GCM, AES-GCM-SIV, XSalsa20-Poly1305, AES-OCB, and so on, are not key or message committing. This means it is possible to decrypt a ciphertext using multiple keys without an authentication error, which can lead to partitioning oracle attacks and deanonymisation in certain online scenarios. Furthermore, if an attacker knows the key, then they can find other messages that have the same tag.
This library was created because there are currently no standardised committing AEAD schemes, adding the commitment property to a non-committing AEAD requires using a MAC, and Encrypt-then-MAC offers improved security guarantees.
Finally, (X)ChaCha20-BLAKE3 is a good combination for an Encrypt-then-MAC scheme because:
- ChaCha20 has a higher security margin than AES, performs well on older devices, and runs in constant time, unlike AES.
- BLAKE3 is fast and evolved from BLAKE, which received a significant amount of cryptanalysis, even more than Keccak (the SHA3 finalist), as part of the SHA3 competition.
You can find the NuGet package here. The easiest way to install this is via the NuGet Package Manager in Visual Studio, as explained here. JetBrains Rider also has a package manager, and instructions can be found here.
- Install the Sodium.Core and Blake3.NET NuGet packages for your project in Visual Studio.
- Download the latest release.
- Move the downloaded
.dllfile into your project folder.
- Click on the
Add Project Reference...in Visual Studio.
- Go to
Browse, click the
Browsebutton, and select the downloaded
using ChaCha20Blake3;to the top of each code file that will use the library.
The libsodium library requires the Visual C++ Redistributable for Visual Studio 2015-2019 to work on Windows. If you want your program to be portable, then you must keep the relevant (x86 or x64)
vcruntime140.dll file in the same folder as your executable on Windows.
⚠️WARNING: Never reuse a nonce with the same key.
const string filePath = "C:\\Users\\samuel-lucas6\\Pictures\\test.jpg"; const string version = "application v1.0.0"; // The message does not have to be a file byte message = File.ReadAllBytes(filePath); // The nonce should be a counter that gets incremented for each message encrypted using the same key byte nonce = new byte[ChaCha20BLAKE3.NonceSize]; // The key can be randomly generated using a CSPRNG or derived using a KDF (e.g. Argon2, HKDF, etc) byte key = SodiumCore.GetRandomBytes(ChaCha20BLAKE3.KeySize); // The additional data can be null but is ideal for file headers, version numbers, timestamps, etc byte additionalData = Encoding.UTF8.GetBytes(version); // Encrypt the message byte ciphertext = ChaCha20BLAKE3.Encrypt(message, nonce, key, additionalData); // Decrypt the ciphertext byte plaintext = ChaCha20BLAKE3.Decrypt(ciphertext, nonce, key, additionalData);
⚠️WARNING: Never reuse a nonce with the same key.
const string filePath = "C:\\Users\\samuel-lucas6\\Pictures\\test.jpg"; const string version = "application v1.0.0"; // The message does not have to be a file byte message = File.ReadAllBytes(filePath); // The nonce can be a counter or randomly generated using a CSPRNG // Increment or randomly generate the nonce for each message encrypted using the same key byte nonce = SodiumCore.GetRandomBytes(XChaCha20BLAKE3.NonceSize); // The key can be randomly generated using a CSPRNG or derived using a KDF (e.g. Argon2, HKDF, etc) byte key = SodiumCore.GetRandomBytes(XChaCha20BLAKE3.KeySize); // The additional data can be null but is ideal for file headers, version numbers, timestamps, etc byte additionalData = Encoding.UTF8.GetBytes(version); // Encrypt the message byte ciphertext = XChaCha20BLAKE3.Encrypt(message, nonce, key, additionalData); // Decrypt the ciphertext byte plaintext = XChaCha20BLAKE3.Decrypt(ciphertext, nonce, key, additionalData);
⚠️WARNING: Never reuse a key. As a precaution, you can use at least 16 bytes of unique, random data as part of the additional data to act as a nonce.
const string filePath = "C:\\Users\\samuel-lucas6\\Pictures\\test.jpg"; // The message does not have to be a file byte message = File.ReadAllBytes(filePath); // The key can be randomly generated using a CSPRNG or derived using a KDF (e.g. Argon2, HKDF, etc) byte key = SodiumCore.GetRandomBytes(XChaCha20BLAKE3SIV.KeySize); // The additional data can be null, used as a nonce, and/or used for file headers, version numbers, timestamps, etc byte additionalData = SodiumCore.GetRandomBytes(XChaCha20BLAKE3SIV.KeySize / 2); // Encrypt the message byte ciphertext = XChaCha20BLAKE3SIV.Encrypt(message, key, additionalData); // Decrypt the ciphertext byte plaintext = XChaCha20BLAKE3SIV.Decrypt(ciphertext, key, additionalData);
In sum, ChaCha20-BLAKE3 performs similarly to ChaCha20-Poly1305 and is even faster with large inputs. Whilst it is slower with small messages, I would argue that the additional security makes up for any performance loss.
|ChaCha20-BLAKE3.Encrypt||1.504 us||0.0027 us||0.0024 us|
|ChaCha20-BLAKE3.Decrypt||1.530 us||0.0067 us||0.0060 us|
|XChaCha20-BLAKE3.Encrypt||1.601 us||0.0012 us||0.0010 us|
|XChaCha20-BLAKE3.Decrypt||1.610 us||0.0068 us||0.0060 us|
|XChaCha20-BLAKE3-SIV.Encrypt||1.593 us||0.0086 us||0.0080 us|
|XChaCha20-BLAKE3-SIV.Decrypt||1.610 us||0.0009 us||0.0008 us|
|ChaCha20-Poly1305.Encrypt||785.9 ns||4.59 ns||4.29 ns|
|ChaCha20-Poly1305.Decrypt||793.6 ns||1.25 ns||0.98 ns|
|XChaCha20-Poly1305.Encrypt||865.1 ns||1.24 ns||0.97 ns|
|XChaCha20-Poly1305.Decrypt||888.1 ns||4.23 ns||3.75 ns|
|ChaCha20-BLAKE3.Encrypt||25.49 us||0.039 us||0.032 us|
|ChaCha20-BLAKE3.Decrypt||24.91 us||0.026 us||0.024 us|
|XChaCha20-BLAKE3.Encrypt||25.75 us||0.042 us||0.039 us|
|XChaCha20-BLAKE3.Decrypt||24.99 us||0.051 us||0.048 us|
|XChaCha20-BLAKE3-SIV.Encrypt||23.76 us||0.030 us||0.028 us|
|XChaCha20-BLAKE3-SIV.Decrypt||23.88 us||0.024 us||0.022 us|
|ChaCha20-Poly1305.Encrypt||16.62 us||0.049 us||0.041 us|
|ChaCha20-Poly1305.Decrypt||16.66 us||0.096 us||0.090 us|
|XChaCha20-Poly1305.Encrypt||16.76 us||0.069 us||0.058 us|
|XChaCha20-Poly1305.Decrypt||16.70 us||0.020 us||0.017 us|
|ChaCha20-BLAKE3.Encrypt||40.38 us||0.060 us||0.056 us|
|ChaCha20-BLAKE3.Decrypt||39.58 us||0.035 us||0.033 us|
|XChaCha20-BLAKE3.Encrypt||40.53 us||0.038 us||0.032 us|
|XChaCha20-BLAKE3.Decrypt||39.50 us||0.048 us||0.045 us|
|XChaCha20-BLAKE3-SIV.Encrypt||36.02 us||0.673 us||0.661 us|
|XChaCha20-BLAKE3-SIV.Decrypt||36.91 us||0.034 us||0.032 us|
|ChaCha20-Poly1305.Encrypt||32.87 us||0.051 us||0.043 us|
|ChaCha20-Poly1305.Decrypt||32.92 us||0.187 us||0.175 us|
|XChaCha20-Poly1305.Encrypt||32.85 us||0.046 us||0.039 us|
|XChaCha20-Poly1305.Decrypt||33.03 us||0.093 us||0.087 us|
|ChaCha20-BLAKE3.Encrypt||63.93 us||0.098 us||0.091 us|
|ChaCha20-BLAKE3.Decrypt||62.47 us||0.142 us||0.133 us|
|XChaCha20-BLAKE3.Encrypt||64.31 us||0.141 us||0.131 us|
|XChaCha20-BLAKE3.Decrypt||62.67 us||0.084 us||0.078 us|
|XChaCha20-BLAKE3-SIV.Encrypt||59.08 us||0.053 us||0.049 us|
|XChaCha20-BLAKE3-SIV.Decrypt||60.09 us||0.052 us||0.049 us|
|ChaCha20-Poly1305.Encrypt||65.33 us||0.182 us||0.142 us|
|ChaCha20-Poly1305.Decrypt||65.75 us||0.529 us||0.494 us|
|XChaCha20-Poly1305.Encrypt||65.43 us||0.236 us||0.197 us|
|XChaCha20-Poly1305.Decrypt||65.79 us||0.584 us||0.546 us|
|ChaCha20-BLAKE3.Encrypt||208.2 us||2.65 us||2.48 us|
|ChaCha20-BLAKE3.Decrypt||196.0 us||2.56 us||2.39 us|
|XChaCha20-BLAKE3.Encrypt||208.1 us||2.94 us||2.60 us|
|XChaCha20-BLAKE3.Decrypt||197.1 us||2.65 us||2.35 us|
|XChaCha20-BLAKE3-SIV.Encrypt||206.1 us||2.82 us||2.64 us|
|XChaCha20-BLAKE3-SIV.Decrypt||196.4 us||3.14 us||2.93 us|
|ChaCha20-Poly1305.Encrypt||182.0 us||1.15 us||1.08 us|
|ChaCha20-Poly1305.Decrypt||180.9 us||1.49 us||1.39 us|
|XChaCha20-Poly1305.Encrypt||180.9 us||1.13 us||1.00 us|
|XChaCha20-Poly1305.Decrypt||181.1 us||1.45 us||1.29 us|
|ChaCha20-BLAKE3.Encrypt||44.08 ms||0.814 ms||0.937 ms|
|ChaCha20-BLAKE3.Decrypt||42.88 ms||0.736 ms||0.653 ms|
|XChaCha20-BLAKE3.Encrypt||41.90 ms||0.812 ms||0.967 ms|
|XChaCha20-BLAKE3.Decrypt||42.31 ms||0.653 ms||0.579 ms|
|XChaCha20-BLAKE3-SIV.Encrypt||42.35 ms||0.821 ms||1.008 ms|
|XChaCha20-BLAKE3-SIV.Decrypt||42.39 ms||0.694 ms||0.649 ms|
|ChaCha20-Poly1305.Encrypt||49.07 ms||0.289 ms||0.271 ms|
|ChaCha20-Poly1305.Decrypt||48.68 ms||0.171 ms||0.143 ms|
|XChaCha20-Poly1305.Encrypt||49.02 ms||0.150 ms||0.140 ms|
|XChaCha20-Poly1305.Decrypt||48.77 ms||0.195 ms||0.173 ms|
|Product||Versions Compatible and additional computed target framework versions.|
|.NET||net5.0 was computed. net5.0-windows was computed. net6.0 was computed. 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 was computed. 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. net8.0 was computed. net8.0-android was computed. net8.0-ios was computed. net8.0-maccatalyst was computed. net8.0-macos was computed. net8.0-tvos was computed. net8.0-windows was computed.|
|.NET Core||netcoreapp3.0 was computed. netcoreapp3.1 was computed.|
|.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.|
This package is not used by any NuGet packages.
This package is not used by any popular GitHub repositories.