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add support for seedqr parsing

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This commit is contained in:
Craig Raw 2022-05-17 08:02:24 +02:00
parent eddd6406ef
commit 38deacaeec
1 changed files with 58 additions and 0 deletions
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58
src/main/java/com/sparrowwallet/drongo/wallet/SeedQR.java Normal file
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package com.sparrowwallet.drongo.wallet;
import com.sparrowwallet.drongo.Utils;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.IntStream;
public class SeedQR {
public static DeterministicSeed getSeed(String seedQr) {
if(seedQr.length() < 48 || seedQr.length() > 96 || seedQr.length() % 4 > 0) {
throw new IllegalArgumentException("Invalid SeedQR length: " + seedQr.length());
}
if(!seedQr.chars().allMatch(c -> c >= '0' && c <= '9')) {
throw new IllegalArgumentException("SeedQR contains non-digit characters: " + seedQr);
}
List<Integer> indexes = IntStream.iterate(0, i -> i + 4).limit((int)Math.ceil(seedQr.length() / 4.0))
.mapToObj(i -> seedQr.substring(i, Math.min(i + 4, seedQr.length())))
.map(Integer::parseInt)
.collect(Collectors.toList());
List<String> words = new ArrayList<>(indexes.size());
for(Integer index : indexes) {
words.add(Bip39MnemonicCode.INSTANCE.getWordList().get(index));
}
return new DeterministicSeed(words, null, System.currentTimeMillis(), DeterministicSeed.Type.BIP39);
}
public static DeterministicSeed getSeed(byte[] compactSeedQr) {
if(compactSeedQr[0] != 0x41 && compactSeedQr[0] != 0x42) {
throw new IllegalArgumentException("Invalid CompactSeedQR header");
}
if(compactSeedQr.length < 19) {
throw new IllegalArgumentException("Invalid CompactSeedQR length");
}
String qrHex = Utils.bytesToHex(compactSeedQr);
String seedHex;
if(qrHex.endsWith("0ec")) {
seedHex = qrHex.substring(3, qrHex.length() - 3);
} else {
seedHex = qrHex.substring(3, qrHex.length() - 1);
}
byte[] seed = Utils.hexToBytes(seedHex);
if(seed.length < 16 || seed.length > 32 || seed.length % 4 > 0) {
throw new IllegalArgumentException("Invalid CompactSeedQR length: " + compactSeedQr.length);
}
return new DeterministicSeed(seed, null, System.currentTimeMillis());
}
}