com.sourcegraph.semanticdb_javac.MD5 Maven / Gradle / Ivy

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plugin

There is a newer version: 0.10.3

package com.sourcegraph.semanticdb_javac;

import java.nio.CharBuffer;
import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

/** Utility to compute MD5 checksums of strings. */
public final class MD5 {
  private static final char[] HEX_ARRAY;

  static {
    HEX_ARRAY = "0123456789ABCDEF".toCharArray();
  }

  private static String bytesToHex(byte[] bytes) {
    char[] hexChars = new char[bytes.length * 2];
    int j = 0;
    while (j < bytes.length) {
      int v = bytes[j] & 0xFF;
      hexChars[j * 2] = HEX_ARRAY[v >>> 4];
      hexChars[j * 2 + 1] = HEX_ARRAY[v & 0x0F];
      j += 1;
    }
    return new String(hexChars);
  }

  public static String digest(CharSequence chars) throws NoSuchAlgorithmException {
    MessageDigest md5 = MessageDigest.getInstance("MD5");
    return bytesToHex(md5.digest(chars.toString().getBytes()));
  }
}