SHA安全散列算法

package com.dream.util;

import java.security.MessageDigest;
import java.security.Security;

import junit.framework.TestCase;
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 org.bouncycastle.util.encoders.Hex;

/**
 * @author zxg
 * @see SHA 安全散列算法 跟md5的区别主要是明文一样，对应加密后的值密文更加散列，更安全 SHA1,MD5已经被王小云教授破解
 */
public class SHATest extends TestCase {
	private final String str = "zxg is a boy";
	/**
	 * jdk SHA1
	 */
	public void testjdkSHA() throws Exception {
		MessageDigest md = MessageDigest.getInstance("SHA");
		md.update(str.getBytes());
		System.out.println(Hex.toHexString(md.digest()));

	}
	/**
	 * bc SHA1
	 */
	public void testbcSHA1() {
		Digest digest = new SHA1Digest();
		digest.update(str.getBytes(), 0, str.getBytes().length);
		byte[] sha1Bytes = new byte[digest.getDigestSize()];
		digest.doFinal(sha1Bytes, 0);
		System.out.println(org.bouncycastle.util.encoders.Hex
				.toHexString(sha1Bytes));
	}

	/**
	 * bc SHA224
	 */
	public void testbcSHA2() {
		Digest digest = new SHA224Digest();
		digest.update(str.getBytes(), 0, str.getBytes().length);
		byte[] sha224Bytes = new byte[digest.getDigestSize()];
		digest.doFinal(sha224Bytes, 0);
		System.out.println(org.bouncycastle.util.encoders.Hex
				.toHexString(sha224Bytes));
	}

	/**
	 * bc SHA224 第二种方式
	 */
	public void testbcSHA224_2() throws Exception {
		Security.addProvider(new BouncyCastleProvider());
		MessageDigest md = MessageDigest.getInstance("SHA224");
		md.update(str.getBytes());
		System.out.println(Hex.toHexString(md.digest()));

	}

	/**
	 * apache SHA1
	 */
	public void testccSHA() throws Exception {
		System.out.println(DigestUtils.sha1Hex(str.getBytes()));
	}
}