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61 lines
1.8 KiB
C#
61 lines
1.8 KiB
C#
#if FEATURE_HMAC_SHA1
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using System.Security.Cryptography;
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namespace Renci.SshNet.Security.Cryptography
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{
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/// <summary>
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/// Computes a Hash-based Message Authentication Code (HMAC) by using the <see cref="SHA1"/> hash function.
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/// </summary>
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public class HMACSHA1 : System.Security.Cryptography.HMACSHA1
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{
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private readonly int _hashSize;
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/// <summary>
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/// Initializes a <see cref="HMACSHA1"/> with the specified key.
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/// </summary>
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/// <param name="key">The key.</param>
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public HMACSHA1(byte[] key)
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: base(key)
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{
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_hashSize = base.HashSize;
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}
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/// <summary>
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/// Initializes a <see cref="HMACSHA1"/> with the specified key and size of the computed hash code.
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/// </summary>
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/// <param name="key">The key.</param>
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/// <param name="hashSize">The size, in bits, of the computed hash code.</param>
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public HMACSHA1(byte[] key, int hashSize)
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: base(key)
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{
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_hashSize = hashSize;
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}
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/// <summary>
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/// Gets the size, in bits, of the computed hash code.
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/// </summary>
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/// <value>
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/// The size, in bits, of the computed hash code.
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/// </value>
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public override int HashSize
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{
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get { return _hashSize; }
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}
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/// <summary>
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/// Finalizes the hash computation after the last data is processed by the cryptographic stream object.
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/// </summary>
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/// <returns>
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/// The computed hash code.
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/// </returns>
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protected override byte[] HashFinal()
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{
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var hash = base.HashFinal();
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return hash.Take(HashSize / 8);
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}
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}
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}
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#endif // FEATURE_HMAC_SHA1
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