Class HmacSha1

Namespace

CryptoHives.Foundation.Security.Cryptography.Mac

Assembly

CryptoHives.Foundation.Security.Cryptography.dll

Computes the HMAC-SHA-1 message authentication code.

[Obsolete("HMAC-SHA-1 is provided for legacy compatibility. Prefer HmacSha256 or stronger.")]
public sealed class HmacSha1 : HmacCore, IMac, IDisposable

Inheritance

object

HmacCore

HmacSha1

Implements

IMac

IDisposable

Inherited Members

HmacCore.AlgorithmName

HmacCore.MacSize

HmacCore.Update(ReadOnlySpan<byte>)

HmacCore.Finalize(Span<byte>)

HmacCore.Reset()

HmacCore.ComputeHash(ReadOnlySpan<byte>)

HmacCore.ComputeHash(byte[])

HmacCore.Dispose()

object.ToString()

object.Equals(object)

object.Equals(object, object)

object.ReferenceEquals(object, object)

object.GetHashCode()

object.GetType()

Remarks

This is a fully managed implementation of HMAC-SHA-1 as defined in RFC 2104, using the CryptoHives SHA-1 implementation. It does not rely on OS or hardware cryptographic APIs, ensuring deterministic behavior across all platforms.

HMAC-SHA-1 produces a 160-bit (20-byte) authentication tag.

Security warning: SHA-1 is considered weak for collision resistance. While HMAC-SHA-1 remains secure for authentication, prefer HMAC-SHA-256 or stronger variants for new applications.

Constructors

HmacSha1(byte[])

Initializes a new instance of the HmacSha1 class.

public HmacSha1(byte[] key)

Parameters

key byte[]

The secret key.

Fields

MacSizeBits

The MAC output size in bits.

public const int MacSizeBits = 160

Field Value

int

MacSizeBytes

The MAC output size in bytes.

public const int MacSizeBytes = 20

Field Value

int

Methods

Create(byte[])

Creates a new instance of the HmacSha1 class.

public static HmacSha1 Create(byte[] key)

Parameters

key byte[]

The secret key.

Returns

HmacSha1

A new HMAC-SHA-1 instance.

Hash(byte[], byte[])

Computes the HMAC-SHA-1 tag for the specified key and data in a single operation.

public static byte[] Hash(byte[] key, byte[] data)

Parameters

key byte[]

The secret key.

data byte[]

The data to authenticate.

Returns

byte[]

The 20-byte MAC tag.