Cryptography Helpers by ZTn

Some extension methods to help with cryptography.

ZTn.Cryptography.Helpers

A very simple library providing some extension methods for cryptographic purposes. Most of these methods try to be fluent by returning the output.

AES

Using Stream with an implicit output stream

A MemoryStream is created internally, don't forget to dispose later.

The IV is automatically written to / read from the 16 first bytes of the output:

var key = new byte[] {/* key bytes */};

using var cipheredStream = await inputStream.AesEncryptAsync(key);

using var decipheredStream = await cipheredStream.AesDecryptAsync(key);

Using a Stream with an explicit output stream

The IV is automatically written to / read from the 16 first bytes of the output:

var key = new byte[] {/* key bytes */};

using var cipheredStream = new MemoryStream();
await inputStream.AesEncryptAsync(cipheredStream, key);

using var decipheredStream = new MemoryStream();
await cipheredStream.AesDecryptAsync(decipheredStream, key);

The IV can also be explicitly defined:

var key = new byte[] {/* key bytes */};
var iv = new byte[] {/* IV bytes */};

using var cipheredStream = new MemoryStream();
await inputStream.AesEncryptAsync(cipheredStream, key, iv);

using var decipheredStream = new MemoryStream();
await cipheredStream.AesDecryptAsync(decipheredStream, key, iv);

Using byte[]

var key = new byte[] {/* key bytes */};

var cipheredBytes = await inputBytes.AesEncryptAsync(key);

var decipheredBytes = await cipheredBytes.AesDecryptAsync(key);