RsaDigitalSignature
Implements RSA digital signature algorithm.
using Renci.SshNet.Common;
using Renci.SshNet.Security.Cryptography.Ciphers;
using System;
using System.Runtime.CompilerServices;
using System.Security.Cryptography;
namespace Renci.SshNet.Security.Cryptography
{
public class RsaDigitalSignature : CipherDigitalSignature, IDisposable
{
private HashAlgorithm _hash;
private bool _isDisposed;
public RsaDigitalSignature(RsaKey rsaKey)
: this(rsaKey, HashAlgorithmName.SHA1)
{
}
public RsaDigitalSignature(RsaKey rsaKey, HashAlgorithmName hashAlgorithmName)
: base(ObjectIdentifier.FromHashAlgorithmName(hashAlgorithmName), new RsaCipher(rsaKey))
{
HashAlgorithm obj = CryptoConfig.CreateFromName(hashAlgorithmName.Name) as HashAlgorithm;
if (obj == null) {
DefaultInterpolatedStringHandler defaultInterpolatedStringHandler = new DefaultInterpolatedStringHandler(26, 2);
defaultInterpolatedStringHandler.AppendLiteral("Could not create ");
defaultInterpolatedStringHandler.AppendFormatted("HashAlgorithm");
defaultInterpolatedStringHandler.AppendLiteral(" from `");
defaultInterpolatedStringHandler.AppendFormatted(hashAlgorithmName);
defaultInterpolatedStringHandler.AppendLiteral("`.");
throw new ArgumentException(defaultInterpolatedStringHandler.ToStringAndClear(), "hashAlgorithmName");
}
_hash = obj;
}
protected override byte[] Hash(byte[] input)
{
return _hash.ComputeHash(input);
}
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
protected virtual void Dispose(bool disposing)
{
if (!_isDisposed && disposing) {
HashAlgorithm hash = _hash;
if (hash != null) {
hash.Dispose();
_hash = null;
}
_isDisposed = true;
}
}
~RsaDigitalSignature()
{
Dispose(false);
}
}
}