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。。。。。。}