Android 登录信息进行RSA加密

2019-11-08 00:13:37
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最近在项目中碰到这样一个需求，对登录密码进行加密，网上查找资料后，决定使用RSA机密技术对密码进行加密。
首先有服务端生产一对公钥和私钥我们在进行加密之前，先从服务器获取公钥，获取到公钥串之后，在对密码进行加密。
map.put("passWord", new String(Hex.encodeHex(RSAUtils.encryptByPublicKey(password,rsastr))));此处，就是在登陆之前，对密码进行加密
password：登录密码 rsastr：从服务器获取的公钥串Hex.encodeHex：对加密后的密码串进行编码，项目中需要集成相应的jar。下面给出 RSAUtils的代码import java.io.ByteArrayOutputStream;import java.security.Key;import java.security.KeyFactory;import java.security.KeyPair;import java.security.KeyPairGenerator;import java.security.PRivateKey;import java.security.PublicKey;import java.security.Signature;import java.security.interfaces.RSAPrivateKey;import java.security.interfaces.RSAPublicKey;import java.security.spec.PKCS8EncodedKeySpec;import java.security.spec.X509EncodedKeySpec;import java.util.HashMap;import java.util.Map;import javax.crypto.Cipher;/** * <p> * RSA公钥/私钥/签名工具包 * </p> * <p> * 罗纳德·李维斯特（Ron [R]ivest）、阿迪·萨莫尔（Adi [S]hamir）和伦纳德·阿德曼（Leonard [A]dleman） * </p> * <p> * 字符串格式的密钥在未在特殊说明情况下都为BASE64编码格式<br/> * 由于非对称加密速度极其缓慢，一般文件不使用它来加密而是使用对称加密，<br/> * 非对称加密算法可以用来对对称加密的密钥加密，这样保证密钥的安全也就保证了数据的安全 * </p> * * @author IceWee * @version 1.0 * @date 2012-4-26 */public class RSAUtils {    /**     * 加密算法RSA     */    public static final String KEY_ALGORITHM = "RSA";    /**     * 签名算法     */    public static final String SIGNATURE_ALGORITHM = "md5withRSA";    /**     * 获取公钥的key     */    private static final String PUBLIC_KEY = "RSAPublicKey";    /**     * 获取私钥的key     */    private static final String PRIVATE_KEY = "RSAPrivateKey";    /**     * RSA最大加密明文大小     */    private static final int MAX_ENCRYPT_BLOCK = 117;    /**     * RSA最大解密密文大小     */    private static final int MAX_DECRYPT_BLOCK = 128;    /**     * <p>     * 生成密钥对(公钥和私钥)     * </p>     *     * @return     * @throws Exception     */    public static Map<String, Object> genKeyPair() throws Exception {        KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance(KEY_ALGORITHM);        keyPairGen.initialize(1024);        KeyPair keyPair = keyPairGen.generateKeyPair();        RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();        RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();        Map<String, Object> keyMap = new HashMap<String, Object>(2);        keyMap.put(PUBLIC_KEY, publicKey);        keyMap.put(PRIVATE_KEY, privateKey);        return keyMap;    }    /**     * <p>     * 用私钥对信息生成数字签名     * </p>     *     * @param data       已加密数据     * @param privateKey 私钥(BASE64编码)     * @return     * @throws Exception     */    public static String sign(byte[] data, String privateKey) throws Exception {        byte[] keyBytes = Base64Utils.decode(privateKey);        PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);        PrivateKey privateK = keyFactory.generatePrivate(pkcs8KeySpec);        Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);        signature.initSign(privateK);        signature.update(data);        return Base64Utils.encode(signature.sign());    }    /**     * <p>     * 校验数字签名     *     * </p>     *     * @param data      已加密数据     * @param publicKey 公钥(BASE64编码)     * @param sign      数字签名     * @return     * @throws Exception     */    public static boolean verify(byte[] data, String publicKey, String sign)            throws Exception {        byte[] keyBytes = Base64Utils.decode(publicKey);        X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);        PublicKey publicK = keyFactory.generatePublic(keySpec);        Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);        signature.initVerify(publicK);        signature.update(data);        return signature.verify(Base64Utils.decode(sign));    }    /**     * <P>     * 私钥解密     * </p>     *     * @param encryptedData 已加密数据     * @param privateKey    私钥(BASE64编码)     * @return     * @throws Exception     */    public static byte[] decryptByPrivateKey(byte[] encryptedData, String privateKey)            throws Exception {        byte[] keyBytes = Base64Utils.decode(privateKey);        PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);        Key privateK = keyFactory.generatePrivate(pkcs8KeySpec);//        Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());        Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");        cipher.init(Cipher.DECRYPT_MODE, privateK);        int inputLen = encryptedData.length;        ByteArrayOutputStream out = new ByteArrayOutputStream();        int offSet = 0;        byte[] cache;        int i = 0;        // 对数据分段解密        while (inputLen - offSet > 0) {            if (inputLen - offSet > MAX_DECRYPT_BLOCK) {                cache = cipher.doFinal(encryptedData, offSet, MAX_DECRYPT_BLOCK);            } else {                cache = cipher.doFinal(encryptedData, offSet, inputLen - offSet);            }            out.write(cache, 0, cache.length);            i++;            offSet = i * MAX_DECRYPT_BLOCK;        }        byte[] decryptedData = out.toByteArray();        out.close();        return decryptedData;    }    /**     * <p>     * 公钥解密     * </p>     *     * @param encryptedData 已加密数据     * @param publicKey     公钥(BASE64编码)     * @return     * @throws Exception     */    public static byte[] decryptByPublicKey(byte[] encryptedData, String publicKey)            throws Exception {        byte[] keyBytes = Base64Utils.decode(publicKey);        X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);        Key publicK = keyFactory.generatePublic(x509KeySpec);//        Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());        Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");        cipher.init(Cipher.DECRYPT_MODE, publicK);        int inputLen = encryptedData.length;        ByteArrayOutputStream out = new ByteArrayOutputStream();        int offSet = 0;        byte[] cache;        int i = 0;        // 对数据分段解密        while (inputLen - offSet > 0) {            if (inputLen - offSet > MAX_DECRYPT_BLOCK) {                cache = cipher.doFinal(encryptedData, offSet, MAX_DECRYPT_BLOCK);            } else {                cache = cipher.doFinal(encryptedData, offSet, inputLen - offSet);            }            out.write(cache, 0, cache.length);            i++;            offSet = i * MAX_DECRYPT_BLOCK;        }        byte[] decryptedData = out.toByteArray();        out.close();        return decryptedData;    }    /**     * <p>     * 公钥加密     * </p>     *     * @param sourcedata      源数据     * @param publicKey 公钥(BASE64编码)     * @return     * @throws Exception     */    public static byte[] encryptByPublicKey(String sourcedata, String publicKey)            throws Exception {        byte[] data = sourcedata.getBytes();        byte[] keyBytes = Base64Utils.decode(publicKey);        X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);        Key publicK = keyFactory.generatePublic(x509KeySpec);        // 对数据加密//        Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());        Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");        cipher.init(Cipher.ENCRYPT_MODE, publicK);        int inputLen = data.length;        ByteArrayOutputStream out = new ByteArrayOutputStream();        int offSet = 0;        byte[] cache;        int i = 0;        // 对数据分段加密        while (inputLen - offSet > 0) {            if (inputLen - offSet > MAX_ENCRYPT_BLOCK) {                cache = cipher.doFinal(data, offSet, MAX_ENCRYPT_BLOCK);            } else {                cache = cipher.doFinal(data, offSet, inputLen - offSet);            }            out.write(cache, 0, cache.length);            i++;            offSet = i * MAX_ENCRYPT_BLOCK;        }        byte[] encryptedData = out.toByteArray();        out.close();        return encryptedData;    }    /**     * <p>     * 私钥加密     * </p>     *     * @param data       源数据     * @param privateKey 私钥(BASE64编码)     * @return     * @throws Exception     */    public static byte[] encryptByPrivateKey(byte[] data, String privateKey)            throws Exception {        byte[] keyBytes = Base64Utils.decode(privateKey);        PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);        Key privateK = keyFactory.generatePrivate(pkcs8KeySpec);//        Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());        Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");        cipher.init(Cipher.ENCRYPT_MODE, privateK);        int inputLen = data.length;        ByteArrayOutputStream out = new ByteArrayOutputStream();        int offSet = 0;        byte[] cache;        int i = 0;        // 对数据分段加密        while (inputLen - offSet > 0) {            if (inputLen - offSet > MAX_ENCRYPT_BLOCK) {                cache = cipher.doFinal(data, offSet, MAX_ENCRYPT_BLOCK);            } else {                cache = cipher.doFinal(data, offSet, inputLen - offSet);            }            out.write(cache, 0, cache.length);            i++;            offSet = i * MAX_ENCRYPT_BLOCK;        }        byte[] encryptedData = out.toByteArray();        out.close();        return encryptedData;    }    /**     * <p>     * 获取私钥     * </p>     *     * @param keyMap 密钥对     * @return     * @throws Exception     */    public static String getPrivateKey(Map<String, Object> keyMap)            throws Exception {        Key key = (Key) keyMap.get(PRIVATE_KEY);        return Base64Utils.encode(key.getEncoded());    }    /**     * <p>     * 获取公钥     * </p>     *     * @param keyMap 密钥对     * @return     * @throws Exception     */    public static String getPublicKey(Map<String, Object> keyMap)            throws Exception {        Key key = (Key) keyMap.get(PUBLIC_KEY);        return Base64Utils.encode(key.getEncoded());    }    //    把byte[]元素之间添加空格，并转化成字符串返回，    public static String byteToString(byte[] resouce){        StringBuffer sb = new StringBuffer();        for (int i = 0; i < resouce.length; i++) {            if (i == resouce.length-1) {                sb.append(Byte.toString(resouce[i]));            }else{                sb.append(Byte.toString(resouce[i]));                sb.append(" ");            }        }        return sb.toString();    }    //    把字符串按照空格进行拆分成数组，然后转化成byte[],返回    public static byte[] stringToByte(String resouce){        String[] strArr = resouce.split(" ");        int len = strArr.length;        byte[] clone = new byte[len];        for (int i = 0; i < len; i++) {            clone[i] = Byte.parseByte(strArr[i]);        }        return clone;    }}