RSAPKCS1KeyExchangeFormatter.cs

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using System.Runtime.Versioning;
 
namespace System.Security.Cryptography;
 
[UnsupportedOSPlatform("browser")]
public class RSAPKCS1KeyExchangeFormatter : AsymmetricKeyExchangeFormatter
{
    private RSA _rsaKey;
 
    private RandomNumberGenerator RngValue;
 
    public override string Parameters => "<enc:KeyEncryptionMethod enc:Algorithm=\"http://www.microsoft.com/xml/security/algorithm/PKCS1-v1.5-KeyEx\" xmlns:enc=\"http://www.microsoft.com/xml/security/encryption/v1.0\" />";
 
    public RandomNumberGenerator? Rng
    {
        get
        {
            return RngValue;
        }
        set
        {
            RngValue = value;
        }
    }
 
    public RSAPKCS1KeyExchangeFormatter()
    {
    }
 
    public RSAPKCS1KeyExchangeFormatter(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.Pkcs1);
    }
}