整理的AES对称加密和RSA非对称加密

来源：互联网发布：node in action中文版编辑：程序博客网时间：2024/05/16 18:56

项目用到这两个加密方法，就整理了下做了个demo，这里也贴出来代码供参考

AES加密解密

public class AESUtil {    /**     * 生成AES密钥     * @param strkey     * @return     * @throws Exception     */    public static String createKeyPairs(String strkey) throws  Exception {        KeyGenerator kgen = KeyGenerator.getInstance("AES");        // SHA1PRNG 强随机种子算法, 要区别4.2以上版本的调用方法        SecureRandom sr = null;        if (android.os.Build.VERSION.SDK_INT >= 17){            sr = SecureRandom.getInstance("SHA1PRNG", "Crypto");        }else{            sr = SecureRandom.getInstance("SHA1PRNG");        }        sr.setSeed(strkey.getBytes("UTF-8"));        kgen.init(128, sr); //256 bits or 128 bits,192bits        SecretKey skey = kgen.generateKey();        byte[] raw = skey.getEncoded();        Log.e("AES----KEY",new String(raw,"UTF-8"));        return new String(raw);    }    /**     * AES加密，传入需要加密的明文和key     * @param key     * @param src     * @return     * @throws Exception     */    public static String encrypt(String key, String src) throws Exception {        byte[] result = encrypt(key.getBytes("UTF-8"), src.getBytes("UTF-8"));        return Base64.encodeToString(result, Base64.DEFAULT);    }    private static byte[] encrypt(byte[] key, byte[] src) throws Exception {        SecretKeySpec skeySpec = new SecretKeySpec(key, "AES");        Cipher cipher = Cipher.getInstance("AES");        cipher.init(Cipher.ENCRYPT_MODE, skeySpec);        byte[] encrypted = cipher.doFinal(src);        return encrypted;    }    /**     * AES解密，传入密文和对应的key     * @param key     * @param encrypted     * @return     * @throws Exception     */    public static String decrypt(String key, String encrypted) throws Exception {        byte[] result = decrypt(key.getBytes(), Base64.decode(encrypted, Base64.DEFAULT));        return new String(result,"UTF-8");    }    private static byte[] decrypt(byte[] key, byte[] encrypted) throws Exception {        SecretKeySpec skeySpec = new SecretKeySpec(key, "AES");        Cipher cipher = Cipher.getInstance("AES");        cipher.init(Cipher.DECRYPT_MODE, skeySpec);        byte[] decrypted = cipher.doFinal(encrypted);        return decrypted;    }}

RSA加密解密

public class RSAUtil {    /**     * 生成经BASE64编码后的RSA公钥和私钥     */    public static void createKeyPairs() {        try {            KeyPairGenerator generator = KeyPairGenerator.getInstance("RSA");            generator.initialize(1024, new SecureRandom());            KeyPair pair = generator.generateKeyPair();            PublicKey pubKey = pair.getPublic();            PrivateKey privKey = pair.getPrivate();            byte[] pubk = pubKey.getEncoded();            byte[] privk = privKey.getEncoded();            // base64编码，屏蔽特殊字符            String strpk = new String(Base64.encode(pubk,Base64.DEFAULT));            String strprivk = new String(Base64.encode(privk,Base64.DEFAULT));            Log.e("strpk", strpk);            Log.e("strprivk", strprivk);        } catch (Exception e) {            e.printStackTrace();        }    }    /**     * RSA公钥加密     * @param content待加密的明文     * @param pubKeyRSA公钥     * @return经BASE64编码后的密文     */    public static String pubKeyEnc(String content,String pubKey){        try {            KeyFactory keyf = KeyFactory.getInstance("RSA","BC");            //获取公钥            InputStream is = new ByteArrayInputStream(pubKey.getBytes("utf-8"));            byte[] pubbytes = new byte[new Long(pubKey.length()).intValue()];            is.read(pubbytes);            X509EncodedKeySpec pubX509 = new X509EncodedKeySpec(Base64.decode(pubbytes,Base64.DEFAULT));            PublicKey pkey = keyf.generatePublic(pubX509);            //公钥加密            Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");            cipher.init(Cipher.ENCRYPT_MODE, pkey);            byte[] cipherText = cipher.doFinal(content.getBytes());            // 将加密结果转换为Base64编码结果；便于internet传送            return Base64.encodeToString(cipherText,Base64.DEFAULT);        } catch (Exception e) {            e.printStackTrace();            throw new RuntimeException(e);        }    }    /**     * RSA公钥解密     * @param ciphertext 经BASE64编码过的待解密的密文     * @param pubKey RSA公钥     * @return utf-8编码的明文     */    public static String pubKeyDec(String ciphertext ,String pubKey){        try {            KeyFactory keyf = KeyFactory.getInstance("RSA","BC");            //获取公钥            InputStream is = new ByteArrayInputStream(pubKey.getBytes("utf-8"));            byte[] pubbytes = new byte[new Long(pubKey.length()).intValue()];            is.read(pubbytes);            X509EncodedKeySpec pubX509 = new X509EncodedKeySpec(Base64.decode(pubbytes,Base64.DEFAULT));            PublicKey pkey = keyf.generatePublic(pubX509);            //公钥解密            Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");            cipher.init(Cipher.DECRYPT_MODE, pkey);            byte[] text = cipher.doFinal(Base64.decode(ciphertext,Base64.DEFAULT));            return new String(text,"UTF-8");        } catch (Exception e) {            e.printStackTrace();            throw new RuntimeException(e);        }    }    /**     * RSA私钥加密     * @param content 待加密的明文     * @param privKey RSA私钥     * @return经BASE64编码后的密文     */    public static String privKeyEnc(String content,String privKey){        try {            KeyFactory keyf = KeyFactory.getInstance("RSA","BC");            //获取私钥            InputStream key = new ByteArrayInputStream(privKey.getBytes("utf-8"));            byte[] pribytes = new byte[new Long(privKey.length()).intValue()];            key.read(pribytes);            PKCS8EncodedKeySpec priPKCS8 = new PKCS8EncodedKeySpec(Base64.decode(pribytes,Base64.DEFAULT));            PrivateKey prikey = keyf.generatePrivate(priPKCS8);            //私钥加密            Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");            cipher.init(Cipher.ENCRYPT_MODE, prikey);            byte[] cipherText = cipher.doFinal(content.getBytes());            //将加密结果转换为Base64编码结果；便于internet传送            return Base64.encodeToString(cipherText,Base64.DEFAULT);        } catch (Exception e) {            e.printStackTrace();            throw new RuntimeException(e);        }    }    /**     * RSA私钥解密     * @param ciphertext经BASE84编码过的待解密密文     * @param privKeyRSA私钥     * @returnutf-8编码的明文     */    public static String privKeyDec(String ciphertext ,String privKey){        try {            KeyFactory keyf = KeyFactory.getInstance("RSA","BC");//          获取私钥            InputStream key = new ByteArrayInputStream(privKey.getBytes("utf-8"));            byte[] pribytes = new byte[new Long(privKey.length()).intValue()];            key.read(pribytes);            byte[] buffer = Base64.decode(pribytes,Base64.DEFAULT);            PKCS8EncodedKeySpec priPKCS8 = new PKCS8EncodedKeySpec(buffer);            PrivateKey prikey = keyf.generatePrivate(priPKCS8);            //私钥解密            Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");            cipher.init(Cipher.DECRYPT_MODE, prikey);            byte[] text=Base64.decode(ciphertext,Base64.DEFAULT);            byte[] content = cipher.doFinal(text);            return new String(content,"UTF-8");        } catch (Exception e) {            e.printStackTrace();            throw new RuntimeException(e);        }    }    /**     * RSA私钥数字签名     * @param content 待签内容     * @param privKey RSA私钥     * @return 经BASE64编码后的签名串     */    public static String sign(String content,String privKey){        try {            KeyFactory keyf=KeyFactory.getInstance("RSA","BC");            //获取私钥            InputStream key = new ByteArrayInputStream(privKey.getBytes("utf-8"));            byte[] pribytes = new byte[new Long(privKey.length()).intValue()];            key.read(pribytes);            PKCS8EncodedKeySpec priPKCS8 = new PKCS8EncodedKeySpec(Base64.decode(new String(pribytes),Base64.DEFAULT));            PrivateKey priKey=keyf.generatePrivate(priPKCS8);            //实例化Signature；签名算法：MD5withRSA            Signature signature = Signature.getInstance("MD5withRSA");            //初始化Signature            signature.initSign(priKey);            //更新            signature.update(content.getBytes());            return Base64.encodeToString(signature.sign(),Base64.DEFAULT);        } catch (Exception e) {            e.printStackTrace();            throw new RuntimeException(e);        }    }    /**     * RSA公钥校验数字签名     * @param content 待校验的内容     * @param pubKey RSA公钥     * @param signedStr 签名字符串     * @returntrue:校验成功；false:校验失败     */    public static boolean verify(String content,String pubKey,String signedStr){        try {            //实例化密钥工厂            KeyFactory keyf=KeyFactory.getInstance("RSA","BC");            //获取公钥            InputStream is = new ByteArrayInputStream(pubKey.getBytes("utf-8"));            byte[] pubbytes = new byte[new Long(pubKey.length()).intValue()];            is.read(pubbytes);            X509EncodedKeySpec pubX509 = new X509EncodedKeySpec(Base64.decode(new String(pubbytes),Base64.DEFAULT));            PublicKey pkey = keyf.generatePublic(pubX509);            //实例化Signature；签名算法：MD5withRSA            Signature signature = Signature.getInstance("MD5withRSA");            signature.initVerify(pkey);            signature.update(content.getBytes());            //验证            return signature.verify(Base64.decode(signedStr,Base64.DEFAULT));        } catch (Exception e) {            e.printStackTrace();            throw new RuntimeException(e);        }    }}

以上就是AES和RSA的实现。可以直接拿来用的

一般都是这两种配合使用 AES加密先随机生成一个KEY，然后用RSA对称加密，将AES的KEY加密，在用AES对需要加密的文明进行加密。

下面将附加上demo

http://download.csdn.net/detail/sinat_23134455/9502953

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