一 简介

安全散列算法

固定长度摘要信息

二 SHA算法

SHA-1、SHA-2(SHA-224、SHA-256、SHA384、SHA-512)

三 SHA算法实现

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。。。。。。 }

四 运行结果

jdk sha-1 : ba28a0f5f08efc8afaee4706ffd496e1f88befdb

bc sha-1 : ba28a0f5f08efc8afaee4706ffd496e1f88befdb

bc sha-224 : ae3b58439cd53d28455781fe6dc20c83a45d63e1d9550330c7911f58

cc sha1 – 1 :ba28a0f5f08efc8afaee4706ffd496e1f88befdb

cc sha1 – 2 :ba28a0f5f08efc8afaee4706ffd496e1f88befdb

五 SHA算法应用