ECDiffieHellmanCng.DeriveKeyFromHmac Method

Reference

Definition

Namespace:: System.Security.Cryptography

Assembly:: System.Security.Cryptography.Cng.dll

Assembly:: System.Security.Cryptography.dll

Assembly:: System.Core.dll

Important

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Performs key derivation using a specified HMAC (Hash-based Message Authentication Code) algorithm with optional prepended or appended data.

public:
 override cli::array <System::Byte> ^ DeriveKeyFromHmac(System::Security::Cryptography::ECDiffieHellmanPublicKey ^ otherPartyPublicKey, System::Security::Cryptography::HashAlgorithmName hashAlgorithm, cli::array <System::Byte> ^ hmacKey, cli::array <System::Byte> ^ secretPrepend, cli::array <System::Byte> ^ secretAppend);

public override byte[] DeriveKeyFromHmac (System.Security.Cryptography.ECDiffieHellmanPublicKey otherPartyPublicKey, System.Security.Cryptography.HashAlgorithmName hashAlgorithm, byte[]? hmacKey, byte[]? secretPrepend, byte[]? secretAppend);

public override byte[] DeriveKeyFromHmac (System.Security.Cryptography.ECDiffieHellmanPublicKey otherPartyPublicKey, System.Security.Cryptography.HashAlgorithmName hashAlgorithm, byte[] hmacKey, byte[] secretPrepend, byte[] secretAppend);

override this.DeriveKeyFromHmac : System.Security.Cryptography.ECDiffieHellmanPublicKey * System.Security.Cryptography.HashAlgorithmName * byte[] * byte[] * byte[] -> byte[]

Public Overrides Function DeriveKeyFromHmac (otherPartyPublicKey As ECDiffieHellmanPublicKey, hashAlgorithm As HashAlgorithmName, hmacKey As Byte(), secretPrepend As Byte(), secretAppend As Byte()) As Byte()

Parameters

otherPartyPublicKey: ECDiffieHellmanPublicKey

The other party's public key.

hashAlgorithm: HashAlgorithmName

The hash algorithm to use to derive the key material.

hmacKey: Byte[]

The key for the HMAC.

secretPrepend: Byte[]

A value to prepend to the derived secret before hashing.

secretAppend: Byte[]

A value to append to the derived secret before hashing.

Returns

Byte[]

The HMAC of the shared secret after prepending or appending data as requested.

Exceptions

ArgumentException

The curve used by otherPartyPublicKey has a different size than the curve from this key.

-or-

The hashAlgorithm parameter does not specify a hash.

ArgumentNullException

otherPartyPublicKey is null.

CryptographicException

The curve used by otherPartyPublicKey is different than the curve from this key.

-or-

This instance represents only a public key.

Applies to

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