暗号化

 public static String encrypt(String input) {
   try {
     MessageDigest md = MessageDigest.getInstance("SHA1");
     md.update(input.getBytes("MS932"));
     return toHexString(md.digest());
   } catch (NoSuchAlgorithmException e) {
     e.printStackTrace();
   } catch (UnsupportedEncodingException e) {
     e.printStackTrace();
   }
   return null;
 }
 
 private static String toHexString(byte[] b) {
   StringBuffer hexString = new StringBuffer();
   String plainText=null;
   for (int i = 0; i < b.length; i++) {
     plainText = Integer.toHexString(0xFF & b[i]);
     if (plainText.length() < 2) {
       plainText = "0" + plainText;
     }
     hexString.append(plainText);
   }
   return new String(hexString);
 }
 
 public static void main(String[] args) {
   String string = encrypt("kino");
   System.out.println(string);
 }
 
 
 
import java.security.Key;
 
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
 
 
 
/**
 * 「KEROKERO」という文字列を「TORI」というキーを使って暗号化する
 * @author kero
 *rahZRQ3GiNPeDa85P0NCwA==
 */
public class Test1 extends Base64 {
 
	public static void main(String[] args) throws Exception {
		Key skey = makeKey1(128);
 
		// 暗号化
		byte[] enc = encode1("KEROKERO".getBytes(), skey);
		//System.out.println(encodeBase64(enc));
 
		// 復号化
		byte[] dec = decode1(decodeBase64("5ymWJSWsIvUyD7s6dUL4CA=="), skey);
 
		System.out.println(new String(dec));
	}
 
	/**
	 * 秘密鍵をバイト列から生成する
	 * @param key_bits 鍵の長さ（ビット単位）
	 */
	public static Key makeKey1(int key_bits) {
		// バイト列
		byte[] key = new byte[key_bits / 8];
 
		// バイト列の内容（秘密鍵の値）はプログラマーが決める
		for (int i = 0; i < key.length; i++) {
			key[i] = (byte) (i + 1);
		}
 
		return new SecretKeySpec(key, "AES");
	}
 
	/**
	 * 暗号化
	 */
	public static byte[] encode1(byte[] src, Key skey) {
		try {
			Cipher cipher = Cipher.getInstance("AES");
			cipher.init(Cipher.ENCRYPT_MODE, skey);
			return cipher.doFinal(src);
		} catch (Exception e) {
			throw new RuntimeException(e);
		}
	}
 
	/**
	 * 復号化
	 */
	public static byte[] decode1(byte[] src, Key skey) {
		try {
			Cipher cipher = Cipher.getInstance("AES");
			cipher.init(Cipher.DECRYPT_MODE, skey);
			return cipher.doFinal(src);
		} catch (Exception e) {
			throw new RuntimeException(e);
		}
	}
 
}
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
 
import com.sun.xml.internal.messaging.saaj.packaging.mime.internet.MimeUtility;
 
public class Base64 {
 
	public static String encodeBase64(byte[] data) throws Exception {
 
	    ByteArrayOutputStream forEncode = new ByteArrayOutputStream();
 
	    OutputStream toBase64 = MimeUtility.encode(forEncode, "base64");
	    toBase64.write(data);
	    toBase64.close();
 
	    return forEncode.toString("iso-8859-1");
	}
 
	public static byte[] decodeBase64(String base64) throws Exception {
 
	    InputStream fromBase64 = MimeUtility.decode(
	        new ByteArrayInputStream(base64.getBytes()), "base64");
 
	    byte[] buf = new byte[1024];
	    ByteArrayOutputStream toByteArray = new ByteArrayOutputStream();
 
	    for (int len = -1;(len = fromBase64.read(buf)) != -1;)
	        toByteArray.write(buf, 0, len);
 
	    return toByteArray.toByteArray();
	}
 
	public Base64() {
		super();
	}
 
}