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ECDiffieHellmanCng.DeriveKeyMaterial Method (CngKey)

Derives the key material that is generated from the secret agreement between two parties, given a CngKey object that contains the second party's public key.

Namespace:  System.Security.Cryptography
Assembly:  System.Core (in System.Core.dll)

public byte[] DeriveKeyMaterial(
	CngKey otherPartyPublicKey
)

Parameters

otherPartyPublicKey
Type: System.Security.Cryptography.CngKey

An object that contains the public part of the Elliptic Curve Diffie-Hellman (ECDH) key from the other party in the key exchange.

Return Value

Type: System.Byte[]
A byte array that contains the key material. This information is generated from the secret agreement that is calculated from the current object's private key and the specified public key.

ExceptionCondition
ArgumentNullException

otherPartyPublicKey is null.

ArgumentException

otherPartyPublicKey is invalid. Either its AlgorithmGroup property does not specify ECDiffieHellman or its key size does not match the key size of this instance.

InvalidOperationException

This object's KeyDerivationFunction property specifies the Tls key derivation function, but either Label or Seed is null.

CryptographicException

All other errors.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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