package com.dji.sample.territory.utils;
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import org.bouncycastle.crypto.digests.SM3Digest;
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import org.bouncycastle.util.encoders.Hex;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.IOException;
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public class HashUtil {
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public static String SM3Hash(File file) {
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String filePath = String.valueOf(file);
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String hashHex = "";
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try {
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byte[] fileBytes = readFile(filePath);
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byte[] hash = calculateHash(fileBytes);
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hashHex = Hex.toHexString(hash);
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} catch (IOException e) {
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e.printStackTrace();
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}
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return hashHex;
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}
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private static byte[] readFile(String filePath) throws IOException {
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FileInputStream fis = new FileInputStream(filePath);
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byte[] buffer = new byte[1024];
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int bytesRead;
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StringBuilder sb = new StringBuilder();
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while ((bytesRead = fis.read(buffer)) != -1) {
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sb.append(new String(buffer, 0, bytesRead));
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}
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fis.close();
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return sb.toString().getBytes();
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}
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private static byte[] calculateHash(byte[] input) {
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SM3Digest digest = new SM3Digest();
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digest.update(input, 0, input.length);
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byte[] hash = new byte[digest.getDigestSize()];
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digest.doFinal(hash, 0);
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return hash;
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}
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}
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