RSAOAEPKeyExchangeFormatter.cs

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using System.Runtime.Versioning;
 
namespace System.Security.Cryptography;
 
[UnsupportedOSPlatform("browser")]
public class RSAOAEPKeyExchangeFormatter : AsymmetricKeyExchangeFormatter
{
    private byte[] ParameterValue;
 
    private RSA _rsaKey;
 
    private RandomNumberGenerator RngValue;
 
    public byte[]? Parameter
    {
        get
        {
            if (ParameterValue != null)
            {
                return (byte[])ParameterValue.Clone();
            }
            return null;
        }
        set
        {
            if (value != null)
            {
                ParameterValue = (byte[])value.Clone();
            }
            else
            {
                ParameterValue = null;
            }
        }
    }
 
    public override string? Parameters => null;
 
    public RandomNumberGenerator? Rng
    {
        get
        {
            return RngValue;
        }
        set
        {
            RngValue = value;
        }
    }
 
    public RSAOAEPKeyExchangeFormatter()
    {
    }
 
    public RSAOAEPKeyExchangeFormatter(AsymmetricAlgorithm key)
    {
        if (key == null)
        {
            throw new ArgumentNullException("key");
        }
        _rsaKey = (RSA)key;
    }
 
    public override void SetKey(AsymmetricAlgorithm key)
    {
        if (key == null)
        {
            throw new ArgumentNullException("key");
        }
        _rsaKey = (RSA)key;
    }
 
    public override byte[] CreateKeyExchange(byte[] rgbData, Type? symAlgType)
    {
        return CreateKeyExchange(rgbData);
    }
 
    public override byte[] CreateKeyExchange(byte[] rgbData)
    {
        if (_rsaKey == null)
        {
            throw new CryptographicUnexpectedOperationException(System.SR.Cryptography_MissingKey);
        }
        return _rsaKey.Encrypt(rgbData, RSAEncryptionPadding.OaepSHA1);
    }
}