Example usage for org.bouncycastle.crypto.digests SHA256Digest getEncodedState

Introduction

In this page you can find the example usage for org.bouncycastle.crypto.digests SHA256Digest getEncodedState.

Prototype

public byte[] getEncodedState() 

Source Link

Usage

From source file:co.rsk.mine.MinerServerImpl.java

License:Open Source License

public static byte[] compressCoinbase(byte[] bitcoinMergedMiningCoinbaseTransactionSerialized,
        boolean lastOccurrence) {
    List<Byte> coinBaseTransactionSerializedAsList = java.util.Arrays
            .asList(ArrayUtils.toObject(bitcoinMergedMiningCoinbaseTransactionSerialized));
    List<Byte> tagAsList = java.util.Arrays.asList(ArrayUtils.toObject(RskMiningConstants.RSK_TAG));

    int rskTagPosition;
    if (lastOccurrence) {
        rskTagPosition = Collections.lastIndexOfSubList(coinBaseTransactionSerializedAsList, tagAsList);
    } else {//from  w  ww  .ja v  a  2 s  .  c  o  m
        rskTagPosition = Collections.indexOfSubList(coinBaseTransactionSerializedAsList, tagAsList);
    }

    int remainingByteCount = bitcoinMergedMiningCoinbaseTransactionSerialized.length - rskTagPosition
            - RskMiningConstants.RSK_TAG.length - RskMiningConstants.BLOCK_HEADER_HASH_SIZE;
    if (remainingByteCount > RskMiningConstants.MAX_BYTES_AFTER_MERGED_MINING_HASH) {
        throw new IllegalArgumentException("More than 128 bytes after RSK tag");
    }
    int sha256Blocks = rskTagPosition / 64;
    int bytesToHash = sha256Blocks * 64;
    SHA256Digest digest = new SHA256Digest();
    digest.update(bitcoinMergedMiningCoinbaseTransactionSerialized, 0, bytesToHash);
    byte[] hashedContent = digest.getEncodedState();
    byte[] trimmedHashedContent = new byte[RskMiningConstants.MIDSTATE_SIZE_TRIMMED];
    System.arraycopy(hashedContent, 8, trimmedHashedContent, 0, RskMiningConstants.MIDSTATE_SIZE_TRIMMED);
    byte[] unHashedContent = new byte[bitcoinMergedMiningCoinbaseTransactionSerialized.length - bytesToHash];
    System.arraycopy(bitcoinMergedMiningCoinbaseTransactionSerialized, bytesToHash, unHashedContent, 0,
            unHashedContent.length);
    return Arrays.concatenate(trimmedHashedContent, unHashedContent);
}

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