Java实现SHA算法的方法详解

package com.imooc.security.sha;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.Security;
import org.apache.commons.codec.binary.Hex;
import org.apache.commons.codec.digest.DigestUtils;
import org.bouncycastle.crypto.Digest;
import org.bouncycastle.crypto.digests.SHA1Digest;
import org.bouncycastle.crypto.digests.SHA224Digest;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
public class ImoocSHA {
  private static String src = "cakin24 security sha";
  public static void main(String[] args) {
     jdkSHA1();
     bcSHA1();
     bcSHA224();
     ccSHA1();
  }
  public static void jdkSHA1() {
    try {
      MessageDigest md = MessageDigest.getInstance("SHA");
      md.update(src.getBytes());
      System.out.println("jdk sha-1 : " + Hex.encodeHexString(md.digest()));
    } catch (NoSuchAlgorithmException e) {
      e.printStackTrace();
    }
  }
  public static void bcSHA1() {
    Digest digest = new SHA1Digest();
    digest.update(src.getBytes(), 0, src.getBytes().length);
    byte[] sha1Bytes = new byte[digest.getDigestSize()];
    digest.doFinal(sha1Bytes, 0);
    System.out.println("bc sha-1 : " + org.bouncycastle.util.encoders.Hex.toHexString(sha1Bytes));
  }
  public static void bcSHA224() {
    Digest digest = new SHA224Digest();
    digest.update(src.getBytes(), 0, src.getBytes().length);
    byte[] sha224Bytes = new byte[digest.getDigestSize()];
    digest.doFinal(sha224Bytes, 0);
    System.out.println("bc sha-224 : " + org.bouncycastle.util.encoders.Hex.toHexString(sha224Bytes));
  }
  public static void ccSHA1() {
    System.out.println("cc sha1 - 1 :" + DigestUtils.sha1Hex(src.getBytes()));
    System.out.println("cc sha1 - 2 :" + DigestUtils.sha1Hex(src));
  }
  //384、256、512。。。。。。
}