132 lines
3.6 KiB
Java
132 lines
3.6 KiB
Java
package com.tangem.util;
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import com.tangem.wallet.btc.BitcoinOutputStream;
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import org.spongycastle.asn1.ASN1Integer;
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import org.spongycastle.asn1.DERSequenceGenerator;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import java.math.BigInteger;
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/**
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* Created by Ilia on 15.02.2018.
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*/
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public class DerEncodingUtil {
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public static byte[] PackInteger(byte[] s)
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{
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ByteArrayOutputStream baos = new ByteArrayOutputStream();
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baos.write((byte)0x02);
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byte length = (byte)s.length;
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if (s[0] > 0x7f) {
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baos.write((byte)(length+1));
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baos.write((byte) 0x00);
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}
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else {
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baos.write((byte)length);
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}
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for(int i = 0; i < length; ++i)
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baos.write(s[i]);
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return baos.toByteArray();
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}
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public static byte[] packSignDer(BigInteger r, BigInteger s, byte[] pubKey) throws IOException
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{
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byte[] signDer = DerEncoding(r, s);
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BitcoinOutputStream packKey = new BitcoinOutputStream();
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packKey.write((byte)0x41);
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packKey.write(pubKey);
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byte[] keyArray = packKey.toByteArray();
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BitcoinOutputStream result = new BitcoinOutputStream();
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result.write((byte)(signDer.length+1));
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result.write(signDer);
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result.write((byte)0x1);
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result.write(keyArray);
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return result.toByteArray();
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}
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public static byte[] packSignDerBitcoinCash(BigInteger r, BigInteger s, byte[] pubKey) throws IOException
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{
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byte[] signDer = DerEncoding(r, s);
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BitcoinOutputStream packKey = new BitcoinOutputStream();
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packKey.write((byte)0x21); //compress key
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packKey.write(pubKey);
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byte[] keyArray = packKey.toByteArray();
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BitcoinOutputStream result = new BitcoinOutputStream();
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result.write((byte)(signDer.length+1));
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result.write(signDer);
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result.write((byte)0x41);
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result.write(keyArray);
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return result.toByteArray();
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}
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public static byte[] DerEncoding(BigInteger r, BigInteger s) throws IOException {
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ByteArrayOutputStream bos = new ByteArrayOutputStream(72);
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DERSequenceGenerator seq = new DERSequenceGenerator(bos);
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seq.addObject(new ASN1Integer(r));
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seq.addObject(new ASN1Integer(s));
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seq.close();
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return bos.toByteArray();
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}
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// public static byte[] DerEncoding(byte[] sign)
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// {
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// byte[] r = sign;
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// byte[] s = new byte[32];
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// for(int i =0; i < 32; ++i)
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// {
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// s[i] = sign[i+32];
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// }
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//
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// byte[] newR = PackInteger(r);
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// byte[] newS = PackInteger(s);
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//
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// ByteArrayOutputStream baos = new ByteArrayOutputStream();
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// baos.write((byte)(newR.length+newS.length+2));
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// baos.write((byte)newR.length);
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// baos.write(newR, 0, newR.length);
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// baos.write((byte)newS.length);
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// baos.write(newS, 0, newS.length);
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//
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// return baos.toByteArray();
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// }
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//
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// public static byte[] DerEncodingBI(BigInteger[] sign)
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// {
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// byte[] r = sign[0].toByteArray();
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// byte[] s = sign[1].toByteArray();
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//
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// byte[] newR = PackInteger(r);
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// byte[] newS = PackInteger(s);
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//
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// ByteArrayOutputStream baos = new ByteArrayOutputStream();
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//
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// baos.write((byte)(newR.length+newS.length+2));
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//
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// baos.write((byte)newR.length);
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// baos.write(newR, 0, newR.length);
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//
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// baos.write((byte)newS.length);
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// baos.write(newS, 0, newS.length);
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//
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// return baos.toByteArray();
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// }
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}
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