DES.IsSemiWeakKey(Byte[]) Method

Reference

Definition

Namespace:: System.Security.Cryptography

Assemblies:: netstandard.dll, System.Security.Cryptography.dll

Assemblies:: netstandard.dll, System.Security.Cryptography.Algorithms.dll

Assembly:: System.Security.Cryptography.Algorithms.dll

Assembly:: mscorlib.dll

Assembly:: netstandard.dll

Source:: DES.cs

Source:: DES.cs

Source:: DES.cs

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

Determines whether the specified key is semi-weak.

public:
 static bool IsSemiWeakKey(cli::array <System::Byte> ^ rgbKey);

public static bool IsSemiWeakKey(byte[] rgbKey);

static member IsSemiWeakKey : byte[] -> bool

Public Shared Function IsSemiWeakKey (rgbKey As Byte()) As Boolean

Parameters

rgbKey: Byte[]

The secret key to test for semi-weakness.

Returns

Boolean

true if the key is semi-weak; otherwise, false.

Exceptions

CryptographicException

The size of the rgbKey parameter is not valid.

Remarks

Semi-weak keys are pairs of keys that result in ciphers that are easy to break. If text is encrypted with a semi-weak key, encrypting the resulting cipher with the partner of that semi-weak key returns the original text. There are six known semi-weak key pairs for the Data Encryption Standard (DES) algorithm; this method checks for those semi-weak keys.

Attempting to set a semi-weak key results in a CryptographicException. When GenerateKey is called to create a random key, a semi-weak key will never be returned.

Applies to

Product	Versions
.NET	Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9, 10
.NET Framework	1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
.NET Standard	2.0, 2.1

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