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using System;
using Org.BouncyCastle.Security;
namespace Org.BouncyCastle.Crypto.Paddings
{
/**
* A padder that adds ISO10126-2 padding to a block.
*/
public class ISO10126d2Padding: IBlockCipherPadding
{
private SecureRandom random;
/**
* Initialise the padder.
*
* @param random a SecureRandom if available.
*/
public void Init(
SecureRandom random)
//throws ArgumentException
{
this.random = CryptoServicesRegistrar.GetSecureRandom(random);
}
/**
* Return the name of the algorithm the cipher implements.
*
* @return the name of the algorithm the cipher implements.
*/
public string PaddingName
{
get { return "ISO10126-2"; }
}
public int AddPadding(byte[] input, int inOff)
{
int count = input.Length - inOff;
if (count > 1)
{
random.NextBytes(input, inOff, count - 1);
}
input[input.Length - 1] = (byte)count;
return count;
}
#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
public int AddPadding(Span<byte> block, int position)
{
int count = block.Length - position;
if (count > 1)
{
random.NextBytes(block[position..(block.Length - 1)]);
}
block[block.Length - 1] = (byte)count;
return count;
}
#endif
public int PadCount(byte[] input)
{
int count = input[input.Length -1];
int position = input.Length - count;
int failed = (position | (count - 1)) >> 31;
if (failed != 0)
throw new InvalidCipherTextException("pad block corrupted");
return count;
}
#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
public int PadCount(ReadOnlySpan<byte> block)
{
int count = block[block.Length - 1];
int position = block.Length - count;
int failed = (position | (count - 1)) >> 31;
if (failed != 0)
throw new InvalidCipherTextException("pad block corrupted");
return count;
}
#endif
}
}
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