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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,47 @@ | ||
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| package snowblossom.miner; | ||
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| import com.google.common.collect.ImmutableSet; | ||
| import java.util.Set; | ||
| import java.util.List; | ||
| import java.util.TreeSet; | ||
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| import java.nio.ByteBuffer; | ||
| import snowblossom.lib.Globals; | ||
| import snowblossom.lib.SnowMerkle; | ||
| import java.util.logging.Logger; | ||
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| public class FieldSourceComposit extends FieldSource | ||
| { | ||
| private List<FieldSource> sources; | ||
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| public FieldSourceComposit(List<FieldSource> sources) | ||
| { | ||
| this.sources = sources; | ||
| TreeSet<Integer> total=new TreeSet<>(); | ||
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| for(FieldSource fs : sources) | ||
| { | ||
| total.addAll(fs.getHoldingSet()); | ||
| } | ||
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| holding_set = ImmutableSet.copyOf(total); | ||
| } | ||
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| public void bulkRead(long word_index, ByteBuffer bb) throws java.io.IOException | ||
| { | ||
| int chunk = (int)(word_index / words_per_chunk); | ||
| for(FieldSource fs : sources) | ||
| { | ||
| if (fs.hasChunk(chunk)) | ||
| { | ||
| fs.bulkRead(word_index, bb); | ||
| return; | ||
| } | ||
| } | ||
| throw new RuntimeException("oh noes"); | ||
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| } | ||
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| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,135 @@ | ||
| package snowblossom.miner; | ||
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| import java.security.MessageDigest; | ||
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| import duckutil.TimeRecord; | ||
| import duckutil.TimeRecordAuto; | ||
| import java.nio.ByteBuffer; | ||
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| import com.google.protobuf.ByteString; | ||
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| import org.junit.Assert; | ||
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| import snowblossom.lib.*; | ||
| import snowblossom.proto.*; | ||
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| import java.util.LinkedList; | ||
| import java.util.List; | ||
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| public class ProofGen | ||
| { | ||
| public static SnowPowProof getProof(FieldSource field_source, FieldSource deck_source, long word_index, long total_words) throws java.io.IOException | ||
| { | ||
| try (TimeRecordAuto tra = TimeRecord.openAuto("SnowMerkleProof.getProof")) | ||
| { | ||
| LinkedList<ByteString> partners = new LinkedList<ByteString>(); | ||
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| MessageDigest md; | ||
| try | ||
| { | ||
| md = MessageDigest.getInstance(Globals.SNOW_MERKLE_HASH_ALGO); | ||
| } | ||
| catch (java.security.NoSuchAlgorithmException e) | ||
| { | ||
| throw new RuntimeException(e); | ||
| } | ||
| getInnerProof(field_source, deck_source, md, partners, word_index, 0, total_words); | ||
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| SnowPowProof.Builder builder = SnowPowProof.newBuilder(); | ||
| builder.setWordIdx(word_index); | ||
| builder.addAllMerkleComponent(partners); | ||
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| return builder.build(); | ||
| } | ||
| } | ||
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| /** | ||
| * If the target is not in specified subtree, return hash of subtree | ||
| * If the target is in the specified subtree, return null and add hash partner from | ||
| * opposite subtree to partners | ||
| */ | ||
| private static ByteString getInnerProof( | ||
| FieldSource field_source, FieldSource deck_source, | ||
| MessageDigest md, List<ByteString> partners, | ||
| long target_word_index, long start, long end) throws java.io.IOException | ||
| { | ||
| boolean inside = false; | ||
| if ((start <= target_word_index) && (target_word_index < end)) | ||
| { | ||
| inside = true; | ||
| } | ||
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| long dist = end - start; | ||
| if (!inside) | ||
| { | ||
| if (deck_source.getDeckFiles().containsKey(dist)) | ||
| { | ||
| long deck_pos = SnowMerkle.HASH_LEN_LONG * (start / dist); | ||
| byte[] buff = new byte[SnowMerkle.HASH_LEN]; | ||
| ByteBuffer bb = ByteBuffer.wrap(buff); | ||
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| ChannelUtil.readFully(deck_source.getDeckFiles().get(dist), bb, deck_pos); | ||
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| return ByteString.copyFrom(buff); | ||
| } | ||
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| if (dist == 1) | ||
| { | ||
| byte[] buff = new byte[SnowMerkle.HASH_LEN]; | ||
| ByteBuffer bb = ByteBuffer.wrap(buff); | ||
| field_source.bulkRead(start, bb); | ||
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| return ByteString.copyFrom(buff); | ||
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| } | ||
| long mid = (start + end) / 2; | ||
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| ByteString left = getInnerProof(field_source, deck_source, md, partners, target_word_index, start, mid); | ||
| ByteString right = getInnerProof(field_source, deck_source, md, partners, target_word_index, mid, end); | ||
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| md.update(left.toByteArray()); | ||
| md.update(right.toByteArray()); | ||
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| byte[] hash = md.digest(); | ||
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| return ByteString.copyFrom(hash); | ||
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| } | ||
| else | ||
| { // we are inside | ||
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| if (dist == 1) | ||
| { | ||
| byte[] buff = new byte[SnowMerkle.HASH_LEN]; | ||
| ByteBuffer bb = ByteBuffer.wrap(buff); | ||
| field_source.bulkRead(start, bb); | ||
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| partners.add(ByteString.copyFrom(buff)); | ||
| return null; | ||
| } | ||
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| long mid = (start + end) / 2; | ||
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| ByteString left = getInnerProof(field_source, deck_source, md, partners, target_word_index, start, mid); | ||
| ByteString right = getInnerProof(field_source, deck_source, md, partners, target_word_index, mid, end); | ||
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| if (target_word_index < mid) | ||
| { | ||
| partners.add(right); | ||
| Assert.assertNull(left); | ||
| } | ||
| else | ||
| { | ||
| partners.add(left); | ||
| Assert.assertNull(right); | ||
| } | ||
| return null; | ||
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| } | ||
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| } | ||
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| } |