Microsoft.Data.Encryption.Cryptography 2.0.0-pre007

Prefix Reserved
This is a prerelease version of Microsoft.Data.Encryption.Cryptography.
dotnet add package Microsoft.Data.Encryption.Cryptography --version 2.0.0-pre007                
NuGet\Install-Package Microsoft.Data.Encryption.Cryptography -Version 2.0.0-pre007                
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="Microsoft.Data.Encryption.Cryptography" Version="2.0.0-pre007" />                
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add Microsoft.Data.Encryption.Cryptography --version 2.0.0-pre007                
#r "nuget: Microsoft.Data.Encryption.Cryptography, 2.0.0-pre007"                
#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 Microsoft.Data.Encryption.Cryptography as a Cake Addin
#addin nuget:?package=Microsoft.Data.Encryption.Cryptography&version=2.0.0-pre007&prerelease

// Install Microsoft.Data.Encryption.Cryptography as a Cake Tool
#tool nuget:?package=Microsoft.Data.Encryption.Cryptography&version=2.0.0-pre007&prerelease                

GitHub license Nuget

Overview

Microsoft.Data.Encryption.Cryptography provides encryption support to applications. It allows developers to implement column- or field-level encryption for data stored in various data stores, including Azure data services.

Features

The library provides APIs for objects like encryption keys, serializers, key store provider interfaces, and associated caches.

The module implements cryptographic operations using a two-level key hierarchy composed of:

  • Data Encryption Keys (DEKs) - symmetric keys that encrypt data.
  • Key Encryption Keys (KEKs) - asymmetric keys that encrypt DEKs.

The Cryptography module uses cryptographic algorithms that are fully compatible with Always Encrypted in Azure SQL. The data encryption algorithm is AEAD_AES_256_CBC_HMAC_SHA_256 that is derived from the IETF specification draft at https://tools.ietf.org/html/draft-mcgrew-aead-aes-cbc-hmac-sha2-05. The key encryption algorithm is RSA with OEAP padding. For more information, see Always Encrypted cryptography.

Using the SDK for data protection in Azure

The SDK helps ensure:

  • Interoperability with Always Encrypted in Azure SQL
    • You can load the data, encrypted using the SDK, to databases columns configured with Always Encrypted in Azure SQL.
    • If you ensure the database columns are encrypted in the same way as the data you are inserting, your Azure Data Factory and Spark jobs as well as your applications can transparently decrypt the data stored in the database and run confidential queries using Azure SQL client drivers. This is because the SDK is compatible with Always Encrypted.
    • Similarly, you can move the data from a database in Azure SQL to another service or application without decrypting it. Then, you can use the SDK to decrypt the data where it needs to be decrypted, rather than in an application that directly talks to the database.

Supported Platforms

The SDK currently supports the following platforms:

  • .NET Standard 2.0 or higher

Installation

To install the latest version of Microsoft.Data.Encryption.Cryptography via NuGet, use the following command:

dotnet add package Microsoft.Data.Encryption.Cryptography --version 2.0.0

Changelog

[2.0.0]

Changed
Exception handling

MicrosoftDataEncryptionException is now abstract. It's handling is fully backward compatible. New exceptions were introduced for better handling of each individual exception case with specific properties to avoid need to parse exception message. All new exceptions are within Microsoft.Data.Encryption.Cryptography.Exceptions namespace.

Type Properties Thrown when
ArgumentEmptyException ArgumentName Collection in the argument is empty
ArgumentNotHexStringException ArgumentName Argument is not valid hexadecimal string
ArgumentNotPositiveException ArgumentName Argument is ⇐0
ArgumentNullException ArgumentName Argument is null
ArgumentNullOrWhiteSpaceException ArgumentName String argument is either null, empty or white space
ArgumentOutOfRangeException ArgumentName, ArgumentValue Argument value is out of valid range
ArgumentSizeIncorrectException ArgumentName, ExpectedSize Collection size is different than expected
ArgumentTooSmallException ArgumentName, ExpectedSize Collection is smaller than necessary
DefaultAESerializerNotFoundException SerializerType, SerializerName SqlSerializer for given type could not be found
DefaultStandardSerializerNotFoundException SerializerType, SerializerName StandardSerializer for given type could not be found
InvalidAlgorithmVersionException CipherTextStart, EncryptionKeyEnd, SpecifiedVersion, SupportedVersion Cipher text specifies unsupported algorithm version
InvalidAuthenticationTagException CipherTextStart, EncryptionKeyEnd Cipher text contains invalid authentication tag, data could have been tampered
InvalidCipherTextSizeException CipherTextStart, EncryptionKeyEnd, ActualLength, ExpectedLength Cipher text length is not of expected length
InvalidDataEncryptionKeySizeException KeySize Size of Encryption key is different than expected
PlaintextEncryptionSettingsException ArgumentName Encryption setting was set to plain text
New serialization API

All serializers are now immutable, it is no longer possible to change serialization properties like size, codepage, precision or scale on already created serializers. New methods were added to allow for allocation-less serialization and deserialization.

All ISerializer<T> serializers now have following methods

Method Parameters Return value Behavior
Identifier - string Property returning string identifier of the serializer
Serialize T value byte[] Serialize to byte[]
Serialize T value, Span<byte> outputBuffer int Serialize to provided Span<byte>, return number of bytes written
Serialize T value, IBufferWriter<byte> outputBuffer int Serialize to provided IBufferWriter<byte>, return number of bytes written
Deserialize byte[] bytes T Deserialize byte[] to T
Deserialize ReadOnlySpan<byte> bytes T Deserialize Span<byte> to T

All IFixedSizeSerializer<T> serializers have additional methods

Method Parameters Return value Behavior
GetSerializedMaxByteCount - int Returns required size of output buffer

All IVariableSizeSerializer<TSuper,TBase> ie. <string, char> or <byte[], byte> have these additional methods

Method Parameters Return value Behavior
GetSerializedMaxByteCount int inputLength int Returns required size of serialization buffer for input of given size - this is upper bound
GetDeserializedMaxLength int serializedLength int Returns required length of deserialization buffer for input of given size - this is upper bound
Deserialize ReadOnlySpan<byte> bytes, Span<TBase> output int Deserialize input bytes to provided output buffer, return number of TBase written in output buffer

Edge cases

  • Nullable struct types default behavior
    • serialization of null to Span/IBufferWriter returns size -1 with no writes in the buffer
    • Deserialization of empty return null
  • Array types (string, byte[]) default behavior
    • serialization of null to Span/IBufferWriter returns size -1 with no writes in the buffer
    • serialization of empty string/byte[] returns size 0 with no writes in the buffer
    • deserialization of empty span returns empty string/byte[], resp. reports size[0] with no writes in the output buffer
Further changes
  • Method AeadAes256CbcHmac256EncryptionAlgorithm.GetOrCreate(DataEncryptionKey dataEncryptionKey, EncryptionType encryptionType) was removed, please use overload with explicit algorithm version (1)
  • Constructor AeadAes256CbcHmac256EncryptionAlgorithm(DataEncryptionKey encryptionKey, EncryptionType encryptionType) was removed, please use overload with explicit algorithm version (1)

[1.2.0]

Changed
  • Further improved Encryption and Decryption performance and memory allocations

[1.1.0]

Added
  • Added Methods in Microsoft.Data.Encryption.Cryptography.DataProtector
  1. Decrypt(byte[] input, int inputOffset, int inputLength, byte[] output, int outputOffset) -> int

    • This method implements decryption functionality that processes a portion of the input byte array and writes the decrypted data into the output byte array. The return value indicates the number of bytes written. By defining output buffer this can significantly reduce allocations.
  2. Encrypt(byte[] input, int inputOffset, int inputLength, byte[] output, int outputOffset) -> int

    • This methos implement encryption functionality that processes a portion of the input byte array and writes the encrypted data into the output byte array. The return value indicates the number of bytes written. By defining output buffer this can significantly reduce allocations.
  3. GetDecryptByteCount(int inputSize) -> int

    • Returns upper bound of bytes required for decryption output based on the given input size.
  4. GetEncryptByteCount(int inputSize) -> int

    • Returns the number of bytes required for encryption output based on the given input size.
Changed
  • AeadAes256CbcHmac256EncryptionAlgorithm is now sealed.
  • CryptographyExtensions.FromHexString implementation is 2-3x faster while allocating 90-97% less memory (applicable only to .NET6.0+)

[1.0.0]

Changed
  • Significant performance and memory optimizations while sustaining current API.
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 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 is compatible.  net8.0-android was computed.  net8.0-browser 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 netcoreapp2.0 was computed.  netcoreapp2.1 was computed.  netcoreapp2.2 was computed.  netcoreapp3.0 was computed.  netcoreapp3.1 was computed. 
.NET Standard netstandard2.0 is compatible.  netstandard2.1 was computed. 
.NET Framework net461 was computed.  net462 was computed.  net463 was computed.  net47 was computed.  net471 was computed.  net472 was computed.  net48 was computed.  net481 was computed. 
MonoAndroid monoandroid was computed. 
MonoMac monomac was computed. 
MonoTouch monotouch was computed. 
Tizen tizen40 was computed.  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)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.

NuGet packages (4)

Showing the top 4 NuGet packages that depend on Microsoft.Data.Encryption.Cryptography:

Package Downloads
Microsoft.Data.Encryption.AzureKeyVaultProvider

The Microsoft Data Encryption SDK provides encryption support to applications. The Microsoft.Data.Encryption.AzureKeyVaultProvider enables .NET applications to use Microsoft Azure Key Vault to perform encryption/decryption. Commonly Used Types: Microsoft.Data.Encryption.AzureKeyVaultProvider.AzureKeyVaultKeyStoreProvider When using NuGet 3.x this package requires at least version 3.4.

Microsoft.Azure.Cosmos.Encryption.Custom

This is an internal library that provides an implementation for client-side encryption for Azure Cosmos DB for NoSQL for multi-tenant use case. For more information, refer to https://aka.ms/CosmosCustomClientEncryption

Microsoft.Data.Encryption.FileEncryption

The Microsoft Data Encryption SDK provides encryption support to applications. The Microsoft.Data.Encryption.FileEncryption package provides parquet file encryption support. Commonly Used Types: Microsoft.Data.Encryption.FileEncryption.IColumn Microsoft.Data.Encryption.FileEncryption.IColumnarDataReader Microsoft.Data.Encryption.FileEncryption.IColumnarDataWriter Microsoft.Data.Encryption.FileEncryption.Column Microsoft.Data.Encryption.FileEncryption.ColumnarCryptographer Microsoft.Data.Encryption.FileEncryption.CryptoMetadata Microsoft.Data.Encryption.FileEncryption.ParquetFileReader Microsoft.Data.Encryption.FileEncryption.ParquetFileWriter Microsoft.Data.Encryption.FileEncryption.FileEncryptionSettings When using NuGet 3.x this package requires at least version 3.4.

Xtrimmer.KeyStoreProvider.Certificate

The implementation of the Microsoft.Data.Encryption.Cryptography.EncryptionKeyStoreProvider for Windows Certificate Store. This package enables using certificates stored in the Windows Certificate Store as key encryption keys.

GitHub repositories (1)

Showing the top 1 popular GitHub repositories that depend on Microsoft.Data.Encryption.Cryptography:

Repository Stars
Azure/azure-cosmos-dotnet-v3
.NET SDK for Azure Cosmos DB for the core SQL API
Version Downloads Last updated
2.0.0-pre007 1,311 10/1/2024
1.2.0 1,943 9/24/2024
1.1.0 141 9/11/2024
1.0.0 137 9/5/2024
0.2.0-pre 139,100 3/26/2021
0.1.0-pre 7,958 1/6/2021