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Tweak sha3 to work on part of the byte array by (start, length)

This commit is contained in:
Roman Mandeleil 2015-02-25 19:13:03 +02:00
parent fa484fa892
commit 97258a1838
2 changed files with 21 additions and 12 deletions
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18
ethereumj-core/src/main/java/org/ethereum/crypto/HashUtil.java
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@ -1,16 +1,12 @@
package org.ethereum.crypto;
import org.ethereum.db.ByteArrayWrapper;
import org.ethereum.util.LRUMap;
import org.ethereum.util.RLP;
import org.ethereum.util.Utils;
import org.spongycastle.crypto.Digest;
import org.spongycastle.crypto.digests.RIPEMD160Digest;
import org.spongycastle.util.encoders.Hex;
import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
@ -20,7 +16,6 @@ import static org.ethereum.util.ByteUtil.EMPTY_BYTE_ARRAY;
public class HashUtil {
private static final int MAX_ENTRIES = 100; // Should contain most commonly hashed values
private static LRUMap<ByteArrayWrapper, byte[]> sha3Cache = new LRUMap<>(0, MAX_ENTRIES);
public static final byte[] EMPTY_DATA_HASH = sha3(EMPTY_BYTE_ARRAY);
public static final byte[] EMPTY_LIST_HASH = sha3(RLP.encodeList());
public static final byte[] EMPTY_TRIE_HASH = sha3(RLP.encodeElement(EMPTY_BYTE_ARRAY));
@ -40,15 +35,14 @@ public class HashUtil {
}
public static byte[] sha3(byte[] input) {
ByteArrayWrapper inputByteArray = new ByteArrayWrapper(input);
byte[] result = sha3Cache.get(inputByteArray);
if (result != null)
return result;
result = SHA3Helper.sha3(input);
sha3Cache.put(inputByteArray, result);
return result;
return SHA3Helper.sha3(input);
}
public static byte[] sha3(byte[] input, int start, int length) {
return SHA3Helper.sha3(input, start, length);
}
public static byte[] ripemd160(byte[] message) {
Digest digest = new RIPEMD160Digest();
if (message != null) {

15
ethereumj-core/src/main/java/org/ethereum/crypto/SHA3Helper.java
View File

@ -25,6 +25,10 @@ public class SHA3Helper {
return sha3(message, new SHA3Digest(DEFAULT_SIZE), true);
}
public static byte[] sha3(byte[] message, int start, int length) {
return sha3(message, start, length, new SHA3Digest(DEFAULT_SIZE), true);
}
protected static String sha3String(String message, Size bitSize) {
SHA3Digest digest = new SHA3Digest(bitSize.bits);
return sha3String(message, digest, true);
@ -66,6 +70,17 @@ public class SHA3Helper {
return doSha3(message, digest, bouncyencoder);
}
private static byte[] sha3(byte[] message, int start, int length, SHA3Digest digest, boolean bouncyencoder) {
byte[] hash = new byte[digest.getDigestSize()];
if (message.length != 0) {
digest.update(message, start, length);
}
digest.doFinal(hash, 0);
return hash;
}
private static byte[] doSha3(byte[] message, SHA3Digest digest, boolean bouncyencoder) {
byte[] hash = new byte[digest.getDigestSize()];