嗷嗷叫的老马

[ComVisible(true)]                                                  //决定是否COM可见
public interface iRSALibary
{
    string RSAGetPubKey();
    string RSAGetPriKey();
    byte[] RSAEncode(ref byte[] plainBytes, string sPubKey);        //对于数组作为参数,一定要加ref,否则VB6中不支持.
    byte[] RSADecode(ref byte[] plainBytes, string sPriKey);
}

[ComVisible(true), ClassInterface(ClassInterfaceType.AutoDual)]     //COM可见,以及接口类型,VB6要调用,必须使用AutoDual
public class cRSA : iRSALibary
{
    private RSACryptoServiceProvider rsa;

    public cRSA()
    {
        rsa = new RSACryptoServiceProvider();
    }

    public string RSAGetPubKey()
    {
        return rsa.ToXmlString(false);
    }

    public string RSAGetPriKey()
    {
        return rsa.ToXmlString(true);
    }

    public byte[] RSAEncode(ref byte[] plainBytes, string sPubKey)
    {
        if (plainBytes == null || plainBytes.Length <= 0)
        {
            throw new NotSupportedException();
        }

        rsa.FromXmlString(sPubKey);

        int bufferSize = (rsa.KeySize / 8) - 11;
        byte[] buffer = new byte[bufferSize];

        using (MemoryStream input = new MemoryStream(plainBytes))
        using (MemoryStream ouput = new MemoryStream())
        {
            while (true)
            {
                int readLine = input.Read(buffer, 0, bufferSize);
                if (readLine <= 0)
                {
                    break;
                }
                byte[] temp = new byte[readLine];
                Array.Copy(buffer, 0, temp, 0, readLine);
                byte[] encrypt = rsa.Encrypt(temp, false);
                ouput.Write(encrypt, 0, encrypt.Length);
            }
            return ouput.ToArray();
        }
    }

    public byte[] RSADecode(ref byte[] plainBytes, string sPriKey)
    {
        if (plainBytes == null || plainBytes.Length <= 0)
        {
            throw new NotSupportedException();
        }

        rsa.FromXmlString(sPriKey);
        int keySize = rsa.KeySize / 8; byte[] buffer = new byte[keySize];

        using (MemoryStream input = new MemoryStream(plainBytes))
        using (MemoryStream output = new MemoryStream())
        {
            while (true)
            {
                int readLine = input.Read(buffer, 0, keySize);
                if (readLine <= 0)
                {
                    break;
                }
                byte[] temp = new byte[readLine];
                Array.Copy(buffer, 0, temp, 0, readLine);
                byte[] decrypt = rsa.Decrypt(temp, false);
                output.Write(decrypt, 0, decrypt.Length);
            }
            return output.ToArray();
        }
    }
}