45 lines
1.5 KiB
Java
45 lines
1.5 KiB
Java
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package net.minecraft.network;
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import io.netty.buffer.ByteBuf;
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import io.netty.channel.ChannelHandlerContext;
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import javax.crypto.Cipher;
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import javax.crypto.ShortBufferException;
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public class CipherBase {
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private final Cipher cipher;
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private byte[] heapIn = new byte[0];
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private byte[] heapOut = new byte[0];
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protected CipherBase(Cipher p_129403_) {
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this.cipher = p_129403_;
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}
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private byte[] bufToByte(ByteBuf p_129405_) {
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int i = p_129405_.readableBytes();
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if (this.heapIn.length < i) {
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this.heapIn = new byte[i];
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}
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p_129405_.readBytes(this.heapIn, 0, i);
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return this.heapIn;
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}
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protected ByteBuf decipher(ChannelHandlerContext p_129410_, ByteBuf p_129411_) throws ShortBufferException {
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int i = p_129411_.readableBytes();
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byte[] abyte = this.bufToByte(p_129411_);
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ByteBuf bytebuf = p_129410_.alloc().heapBuffer(this.cipher.getOutputSize(i));
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bytebuf.writerIndex(this.cipher.update(abyte, 0, i, bytebuf.array(), bytebuf.arrayOffset()));
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return bytebuf;
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}
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protected void encipher(ByteBuf p_129407_, ByteBuf p_129408_) throws ShortBufferException {
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int i = p_129407_.readableBytes();
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byte[] abyte = this.bufToByte(p_129407_);
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int j = this.cipher.getOutputSize(i);
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if (this.heapOut.length < j) {
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this.heapOut = new byte[j];
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}
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p_129408_.writeBytes(this.heapOut, 0, this.cipher.update(abyte, 0, i, this.heapOut));
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}
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}
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