package 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.digests.SHA1Digest;
import org.bouncycastle.crypto.digests.SHA224Digest;
import org.bouncycastle.jce.provider.BouncyCastleProvider;

public class SHA {
	private static final String src = "imooc security sha";

	public static void main(String[] args) {
		ccSHA1();
	}

	private static void ccSHA1() {
		System.out.println("ccSHA1: "+DigestUtils.sha1Hex(src.getBytes()));
		System.out.println("ccSHA1: "+DigestUtils.sha1Hex(src));
	}

	public static void jdkSHA1() {
		try {
			MessageDigest sha1 = MessageDigest.getInstance("SHA");
			sha1.update(src.getBytes());
			System.out.println("jdk sha1:" + Hex.encodeHexString(sha1.digest()));
		} catch (NoSuchAlgorithmException e) {
			e.printStackTrace();
		}
	}

	public static void bcSHA1() {
		SHA1Digest digest = new SHA1Digest();
		digest.update(src.getBytes(), 0, src.getBytes().length);
		byte[] sha1byte = new byte[digest.getDigestSize()];
		digest.doFinal(sha1byte, 0);
		System.out.println("bc sha1:" + org.bouncycastle.util.encoders.Hex.toHexString(sha1byte));
	}

	public static void bcSHA224() {
		SHA224Digest digest = new SHA224Digest();
		digest.update(src.getBytes(), 0, src.getBytes().length);
		byte[] sha224byte = new byte[digest.getDigestSize()];
		digest.doFinal(sha224byte, 0);
		System.out.println("bc sha224:" + org.bouncycastle.util.encoders.Hex.toHexString(sha224byte));
	}

	public static void bdSHA224_1() {
		Security.addProvider(new BouncyCastleProvider());
		try {
			MessageDigest sha224 = MessageDigest.getInstance("SHA224");
			byte[] digest = sha224.digest(src.getBytes());
			System.out.println("sha224:" + org.bouncycastle.util.encoders.Hex.toHexString(digest));
		} catch (NoSuchAlgorithmException e) {
			e.printStackTrace();
		}
	}
}