package com.senmesh.sdk.ssb.util;

import org.apache.commons.codec.binary.Base64;

import javax.crypto.Cipher;
import java.security.KeyFactory;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.PublicKey;
import java.security.spec.X509EncodedKeySpec;


public class SsbRsaUtils {

  public static String encryptByPublicKey(String publicKeyText, String text) throws Exception {
    X509EncodedKeySpec x509EncodedKeySpec2 =
        new X509EncodedKeySpec(Base64.decodeBase64(publicKeyText));
    KeyFactory keyFactory = KeyFactory.getInstance("RSA");
    PublicKey publicKey = keyFactory.generatePublic(x509EncodedKeySpec2);
    Cipher cipher = Cipher.getInstance("RSA");
    cipher.init(Cipher.ENCRYPT_MODE, publicKey);
    byte[] result = cipher.doFinal(text.getBytes());
    return Base64.encodeBase64String(result);
  }

  public static String encryptMd5(String plainText) {
    String re_md5 = new String();
    try {
      MessageDigest md = MessageDigest.getInstance("MD5");
      md.update(plainText.getBytes());
      byte b[] = md.digest();

      int i;

      StringBuffer buf = new StringBuffer("");
      for (int offset = 0; offset < b.length; offset++) {
        i = b[offset];
        if (i < 0)
          i += 256;
        if (i < 16)
          buf.append("0");
        buf.append(Integer.toHexString(i));
      }

      re_md5 = buf.toString();

    } catch (NoSuchAlgorithmException e) {
      e.printStackTrace();
    }
    return re_md5;
  }


}