cn.luues.tool.crypto.digest.mac.BCHMacEngine Maven / Gradle / Ivy
package cn.luues.tool.crypto.digest.mac;
import cn.luues.tool.core.io.IoUtil;
import cn.luues.tool.crypto.CryptoException;
import org.bouncycastle.crypto.CipherParameters;
import org.bouncycastle.crypto.Digest;
import org.bouncycastle.crypto.Mac;
import org.bouncycastle.crypto.macs.HMac;
import org.bouncycastle.crypto.params.KeyParameter;
import java.io.IOException;
import java.io.InputStream;
/**
* BouncyCastle的HMAC算法实现引擎，使用{@link Mac} 实现摘要
* 当引入BouncyCastle库时自动使用其作为Provider
*
* @author Looly
* @since 4.5.13
*/
public class BCHMacEngine implements MacEngine {
private Mac mac;
// ------------------------------------------------------------------------------------------- Constructor start
/**
* 构造
*
* @param digest 摘要算法，为{@link Digest} 的接口实现
* @param key 密钥
* @since 4.5.13
*/
public BCHMacEngine(Digest digest, byte[] key) {
this(digest, new KeyParameter(key));
}
/**
* 构造
*
* @param digest 摘要算法
* @param params 参数，例如密钥可以用{@link KeyParameter}
* @since 4.5.13
*/
public BCHMacEngine(Digest digest, CipherParameters params) {
init(digest, params);
}
// ------------------------------------------------------------------------------------------- Constructor end
/**
* 初始化
*
* @param digest 摘要算法
* @param params 参数，例如密钥可以用{@link KeyParameter}
* @return this
*/
public BCHMacEngine init(Digest digest, CipherParameters params) {
mac = new HMac(digest);
mac.init(params);
return this;
}
@Override
public byte[] digest(InputStream data, int bufferLength) {
if (bufferLength < 1) {
bufferLength = IoUtil.DEFAULT_BUFFER_SIZE;
}
final byte[] buffer = new byte[bufferLength];
byte[] result;
try {
int read = data.read(buffer, 0, bufferLength);
while (read > -1) {
mac.update(buffer, 0, read);
read = data.read(buffer, 0, bufferLength);
}
result = new byte[this.mac.getMacSize()];
mac.doFinal(result, 0);
} catch (IOException e) {
throw new CryptoException(e);
} finally {
mac.reset();
}
return result;
}
/**
* 获得 {@link Mac}
*
* @return {@link Mac}
*/
public Mac getMac() {
return mac;
}
@Override
public int getMacLength() {
return mac.getMacSize();
}
@Override
public String getAlgorithm() {
return this.mac.getAlgorithmName();
}
}