HKDF.DeriveKey Method

Namespace: Rebex.Security.Cryptography

Assembly: Rebex.Security.dll (version 7.0.9119)

DeriveKey(HashingAlgorithmId, Byte[], Int32, Byte[], Byte[])

Derives the output keying material using the Extract-and-Expand key derivation function (HKDF).

Declaration

public static byte[] DeriveKey(HashingAlgorithmId hashingAlgorithmId, byte[] ikm, int outputLength, byte[] salt = null, byte[] info = null)

Parameters

Type	Name	Description
HashingAlgorithmId	hashingAlgorithmId	The hash algorithm for HMAC operations.
Byte[]	ikm	A byte array that contains the input keying material.
Int32	outputLength	The length in bytes of the output keying material. The value must be between 1 and '255 * hash size of hashingAlgorithmId in bytes'.
Byte[]	salt	A byte array that contains the salt. When null or empty salt is specified, this method will use a zero-filled salt with size equal to the hash size of hashingAlgorithmId.
Byte[]	info	A byte array that contains the context and application-specific information. Can be null.

Returns

Type	Description
Byte[]	A byte array that contains the output keying material.

Exceptions

Type	Condition
ArgumentNullException	The ikm is null.
ArgumentException	The ikm is empty, or the outputLength is invalid, or the hashingAlgorithmId is not supported.

DeriveKey(HashingAlgorithmId, ArraySegment<Byte>, ArraySegment<Byte>, ArraySegment<Byte>, ArraySegment<Byte>)

Derives the output keying material using the Extract-and-Expand key derivation function (HKDF).

Declaration

public static void DeriveKey(HashingAlgorithmId hashingAlgorithmId, ArraySegment<byte> ikm, ArraySegment<byte> output, ArraySegment<byte> salt, ArraySegment<byte> info)

Parameters

Type	Name	Description
HashingAlgorithmId	hashingAlgorithmId	The hash algorithm for HMAC operations.
ArraySegment<Byte>	ikm	An ArraySegment<T> that contains the input keying material.
ArraySegment<Byte>	output	An ArraySegment<T> that will receive the output keying material. The length of the output must be between 1 and '255 * hash size of hashingAlgorithmId in bytes'.
ArraySegment<Byte>	salt	An ArraySegment<T> that contains the salt. When an empty salt is specified, this method will use a zero-filled salt with size equal to the hash size of hashingAlgorithmId.
ArraySegment<Byte>	info	An ArraySegment<T> that contains the context and application-specific information. Can be empty.

Exceptions

Type	Condition
ArgumentException	The ikm is empty, or the output has an invalid length, or the hashingAlgorithmId is not supported.