SHATest.java

package com.timliu.security.message_digest;

import java.security.MessageDigest;
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;
import java.math.BigInteger;



public class SHATest 
{
	public static final String src = "sha test";
	public static void main(String[] args) 
	{
		jdkSHA1();
		bcSHA1();
		bcSHA224();
		bcSHA224b();
		generateSha256();
		ccSHA1();

	}
	
	// 用jdk实现:SHA1
	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 (Exception e) {
			e.printStackTrace();
		}
	}
	
	// 用bouncy castle实现:SHA1 
	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));		
	}
	

	// 用bouncy castle实现:SHA224 
	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));		
	}
	
	// 用bouncy castle与jdk结合实现:SHA224 
	public static void bcSHA224b()
	{
		
		try 
		{
			Security.addProvider(new BouncyCastleProvider());
			MessageDigest md = MessageDigest.getInstance("SHA224");
			md.update(src.getBytes());
			System.out.println("bc and JDK sha-224:" + Hex.encodeHexString(md.digest()));
			
		} catch (Exception e) {
			e.printStackTrace();
		}		
	}
	public static void generateSha256() {
		MessageDigest md = MessageDigest.getInstance("SHA-256");

        md.update(src.getBytes("UTF-8")); // Change this to "UTF-16" if needed
        byte[] digest = md.digest();
        BigInteger bigInt = new BigInteger(1, digest);
        System.out.println("Sha256 hash: " + bigInt.toString(16));
	}
	
	// 用common codes实现实现:SHA1
	public static void ccSHA1()
	{
		System.out.println("common codes SHA1 - 1 :" + DigestUtils.sha1Hex(src.getBytes()));
		System.out.println("common codes SHA1 - 2 :" + DigestUtils.sha1Hex(src));
	}
	
	

}