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针对sm2和sm4两种加密算法的java实现

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package com.bouncycastle.crypto.tls;

import java.io.IOException;
import java.io.InputStream;

/**
 * An InputStream for an TLS 1.0 connection.
 */
class TlsInputStream extends InputStream
{
    private byte[] buf = new byte[1];
    private TlsProtocolHandler handler = null;

    TlsInputStream(TlsProtocolHandler handler)
    {
        this.handler = handler;
    }

    public int read(byte[] buf, int offset, int len) throws IOException
    {
        return this.handler.readApplicationData(buf, offset, len);
    }

    public int read() throws IOException
    {
        if (this.read(buf) < 0)
        {
            return -1;
        }
        return buf[0] & 0xff;
    }

    public void close() throws IOException
    {
        handler.close();
    }
}