Android加密算法: java变成jar然后到dll

Android用定制的BouncyCastle (轻量级加密算法)并且去除key长度限制

1. Java AES encrypt example:

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

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

public class Encryptor {
    public static String encrypt(String key1, String key2, String value) {
        try {
            IvParameterSpec iv = new IvParameterSpec(key2.getBytes("UTF-8"));

            SecretKeySpec skeySpec = new SecretKeySpec(key1.getBytes("UTF-8"),
                    "AES");
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
            cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
            byte[] encrypted = cipher.doFinal(value.getBytes());
            System.out.println("encrypted string:"
                    + Base64.encodeBase64String(encrypted));
            return Base64.encodeBase64String(encrypted);
        } catch (Exception ex) {
            ex.printStackTrace();
        }
        return null;
    }

    public static String decrypt(String key1, String key2, String encrypted) {
        try {
            IvParameterSpec iv = new IvParameterSpec(key2.getBytes("UTF-8"));

            SecretKeySpec skeySpec = new SecretKeySpec(key1.getBytes("UTF-8"),
                    "AES");
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
            cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
            byte[] original = cipher.doFinal(Base64.decodeBase64(encrypted));

            return new String(original);
        } catch (Exception ex) {
            ex.printStackTrace();
        }
        return null;
    }

    public static void main(String[] args) {

        String key1 = "Bar12345Bar12345"; // 128 bit key
        String key2 = "ThisIsASecretKet";
        System.out.println(decrypt(key1, key2,
                encrypt(key1, key2, "Hello World")));
    }
}

2. JCE Unlimited Strength installation (java JCE download):
http://stackoverflow.com/questions/6363801/invalidkeyexception-illegal-key-size-java-code-throwing-exception-for-encryp
将local_policy.jar & US_export_policy.jar覆盖JRE security文件夹中的原始jar

3. How to export jar file in Eclipse (non-runnable jar):

http://stackoverflow.com/questions/11033603/how-to-create-a-jar-with-external-libraries-included-in-eclipse

if your code refers other libs, you need to copy the lib's source code in the src folder and compile together and can't use it as a jar reference.

4. convert jar to dll/exe for .Net by ikvm:

http://stackoverflow.com/questions/512124/use-a-jar-java-library-api-in-c

Ref:
http://stackoverflow.com/questions/15554296/simple-java-aes-encrypt-decrypt-example