RC2BCryptModes.cs

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using System;
using System.Security.Cryptography;
using Internal.NativeCrypto;
 
namespace Internal.Cryptography;
 
internal static class RC2BCryptModes
{
    internal static SafeAlgorithmHandle GetHandle(CipherMode cipherMode, int effectiveKeyLength)
    {
        return cipherMode switch
        {
            CipherMode.CBC => OpenRC2Algorithm("ChainingModeCBC", effectiveKeyLength), 
            CipherMode.ECB => OpenRC2Algorithm("ChainingModeECB", effectiveKeyLength), 
            _ => throw new NotSupportedException(), 
        };
    }
 
    private static SafeAlgorithmHandle OpenRC2Algorithm(string cipherMode, int effectiveKeyLength)
    {
        SafeAlgorithmHandle safeAlgorithmHandle = Cng.BCryptOpenAlgorithmProvider("RC2", null, Cng.OpenAlgorithmProviderFlags.NONE);
        safeAlgorithmHandle.SetCipherMode(cipherMode);
        if (effectiveKeyLength != 0)
        {
            safeAlgorithmHandle.SetEffectiveKeyLength(effectiveKeyLength);
        }
        return safeAlgorithmHandle;
    }
}