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/* Transport Security Layer (TLS)
* Copyright (c) 2003-2004 Carlos Guzman Alvarez
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without restriction,
* including without limitation the rights to use, copy, modify, merge,
* publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
using System;
using System.Security.Cryptography;
namespace Mono.Security.Protocol.Tls
{
internal class SslHandshakeHash : System.Security.Cryptography.HashAlgorithm
{
#region Fields
private HashAlgorithm md5;
private HashAlgorithm sha;
private bool hashing;
private byte[] secret;
private byte[] innerPadMD5;
private byte[] outerPadMD5;
private byte[] innerPadSHA;
private byte[] outerPadSHA;
#endregion
#region Constructors
public SslHandshakeHash(byte[] secret)
{
// Create md5 and sha1 hashes
this.md5 = HashAlgorithm.Create("MD5");
this.sha = HashAlgorithm.Create("SHA1");
// Set HashSizeValue
this.HashSizeValue = md5.HashSize + sha.HashSize;
// Update secret
this.secret = secret;
this.Initialize();
}
#endregion
#region Methods
public override void Initialize()
{
this.md5.Initialize();
this.sha.Initialize();
this.initializePad();
this.hashing = false;
}
protected override byte[] HashFinal()
{
if (!this.hashing)
{
this.hashing = true;
}
// Finalize the md5 hash
this.md5.TransformBlock(this.secret, 0, this.secret.Length, this.secret, 0);
this.md5.TransformFinalBlock(this.innerPadMD5, 0, this.innerPadMD5.Length);
byte[] firstResultMD5 = this.md5.Hash;
this.md5.Initialize();
this.md5.TransformBlock(this.secret, 0, this.secret.Length, this.secret, 0);
this.md5.TransformBlock(this.outerPadMD5, 0, this.outerPadMD5.Length, this.outerPadMD5, 0);
this.md5.TransformFinalBlock(firstResultMD5, 0, firstResultMD5.Length);
// Finalize the sha1 hash
this.sha.TransformBlock(this.secret, 0, this.secret.Length, this.secret, 0);
this.sha.TransformFinalBlock(this.innerPadSHA, 0, this.innerPadSHA.Length);
byte[] firstResultSHA = this.sha.Hash;
this.sha.Initialize();
this.sha.TransformBlock(this.secret, 0, this.secret.Length, this.secret, 0);
this.sha.TransformBlock(this.outerPadSHA, 0, this.outerPadSHA.Length, this.outerPadSHA, 0);
this.sha.TransformFinalBlock(firstResultSHA, 0, firstResultSHA.Length);
this.Initialize();
byte[] result = new byte[36];
Buffer.BlockCopy(this.md5.Hash, 0, result, 0, 16);
Buffer.BlockCopy(this.sha.Hash, 0, result, 16, 20);
return result;
}
protected override void HashCore(byte[] array, int ibStart, int cbSize)
{
if (!this.hashing)
{
this.hashing = true;
}
this.md5.TransformBlock(array, ibStart, cbSize, array, ibStart);
this.sha.TransformBlock(array, ibStart, cbSize, array, ibStart);
}
public byte[] CreateSignature(RSA rsa)
{
if (rsa == null)
{
throw new CryptographicUnexpectedOperationException ("missing key");
}
RSASslSignatureFormatter f = new RSASslSignatureFormatter(rsa);
f.SetHashAlgorithm("SslHash");
return f.CreateSignature(this.Hash);
}
public bool VerifySignature(RSA rsa, byte[] rgbSignature)
{
if (rsa == null)
{
throw new CryptographicUnexpectedOperationException ("missing key");
}
if (rgbSignature == null)
{
throw new ArgumentNullException ("rgbSignature");
}
RSASslSignatureDeformatter d = new RSASslSignatureDeformatter(rsa);
d.SetHashAlgorithm("SslHash");
return d.VerifySignature(this.Hash, rgbSignature);
}
#endregion
#region Private Methods
private void initializePad()
{
// Fill md5 arrays
this.innerPadMD5 = new byte[48];
this.outerPadMD5 = new byte[48];
/* Pad the key for inner and outer digest */
for (int i = 0; i < 48; ++i)
{
this.innerPadMD5[i] = 0x36;
this.outerPadMD5[i] = 0x5C;
}
// Fill sha arrays
this.innerPadSHA = new byte[40];
this.outerPadSHA = new byte[40];
/* Pad the key for inner and outer digest */
for (int i = 0; i < 40; ++i)
{
this.innerPadSHA[i] = 0x36;
this.outerPadSHA[i] = 0x5C;
}
}
#endregion
}
}
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