java实现的AES加密算法完整实例

本文实例讲述了java实现的aes加密算法。分享给大家供大家参考，具体如下：

import javax.crypto.cipher;
import javax.crypto.spec.ivparameterspec;
import javax.crypto.spec.secretkeyspec;
import android.util.base64;
/**
 * @author vipin.cb , [e-mail] <br>
 *     sep 27, 2013, 5:18:34 pm <br>
 *     package:- <b>com.veebow.util</b> <br>
 *     project:- <b>veebow</b>
 *     <p>
 */
public class aescrypt {
  private final cipher cipher;
  private final secretkeyspec key;
  private algorithmparameterspec spec;
  public static final string seed_16_character = "u1mju1m0fdouz.qz";
  public aescrypt() throws exception {
    // hash password with sha-256 and crop the output to 128-bit for key
    messagedigest digest = messagedigest.getinstance("sha-256");
    digest.update(seed_16_character.getbytes("utf-8"));
    byte[] keybytes = new byte[32];
    system.arraycopy(digest.digest(), 0, keybytes, 0, keybytes.length);
    cipher = cipher.getinstance("aes/cbc/pkcs7padding");
    key = new secretkeyspec(keybytes, "aes");
    spec = getiv();
  }
  public algorithmparameterspec getiv() {
    byte[] iv = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, };
    ivparameterspec ivparameterspec;
    ivparameterspec = new ivparameterspec(iv);
    return ivparameterspec;
  }
  public string encrypt(string plaintext) throws exception {
    cipher.init(cipher.encrypt_mode, key, spec);
    byte[] encrypted = cipher.dofinal(plaintext.getbytes("utf-8"));
    string encryptedtext = new string(base64.encode(encrypted,
        base64.default), "utf-8");
    return encryptedtext;
  }
  public string decrypt(string cryptedtext) throws exception {
    cipher.init(cipher.decrypt_mode, key, spec);
    byte[] bytes = base64.decode(cryptedtext, base64.default);
    byte[] decrypted = cipher.dofinal(bytes);
    string decryptedtext = new string(decrypted, "utf-8");
    return decryptedtext;
  }
}

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密码安全性在线检测：

高强度密码生成器：
http://tools.jb51.net/password/createstrongpassword

md5在线加密工具：
http://tools.jb51.net/password/createmd5password

迅雷、快车、旋风url加密/解密工具：

在线散列/哈希算法加密工具：

希望本文所述对大家java程序设计有所帮助。