java 安卓 加密解密_Android 加密解密的几种方式总结

Base64

public class Base64Util {/*** 编码** @Param message 需编码的信息* @return* @throws UnsupportedEncodingException*/public static String encodeWord(String message) throws UnsupportedEncodingException {return Base64.encodeToString(message.getBytes("utf-8"), Base64.NO_WRAP);}/*** 解码** @param encodeWord 编码后的内容* @return* @throws UnsupportedEncodingException*/public static String decodeWord(String encodeWord) throws UnsupportedEncodingException {return new String(Base64.decode(encodeWord, Base64.NO_WRAP), "utf-8");}}

RSA

public class RSAUtil {

// 非对称加密密钥算法

public static final String RSA = "RSA";

// 加密填充方式，android 的

public static final String ECB_NO_PADDING = "RSA/None/NoPadding";

// 加密填充方式，标准jdk 的

public static final String ECB_PKCS1_PADDING = "RSA/ECB/PKCS1Padding";

//秘钥默认长度

public static final int DEFAULT_KEY_SIZE = 2048;

// 当要加密的内容超过bufferSize，则采用partSplit进行分块加密

public static final byte[] DEFAULT_SPLIT = "#PART#".getBytes();

// 当前秘钥支持加密的最大字节数

public static final int DEFAULT_BUFFERSIZE = (DEFAULT_KEY_SIZE / 8) - 11;

/**

* 随机生成RSA密钥对

*

* @param keyLength 密钥长度，范围：512～2048

*                  一般1024

* @return

*/

public static KeyPair generateRSAKeyPair(int keyLength) {

try {

KeyPairGenerator kpg = KeyPairGenerator.getInstance(RSA);

kpg.initialize(keyLength);

return kpg.genKeyPair();

} catch (NoSuchAlgorithmException e) {

e.printStackTrace();

return null;

}

}

// ------------------------------------------------ 公钥 ---------------------------------------

/**

* 用公钥对字符串进行加密

*

* @param data 原文

*/

public static byte[] encryptByPublicKey(String type, byte[] data, byte[] publicKey) throws Exception {

// 得到公钥

X509EncodedKeySpec keySpec = new X509EncodedKeySpec(publicKey);

KeyFactory kf = KeyFactory.getInstance(RSA);

PublicKey keyPublic = kf.generatePublic(keySpec);

// 加密数据

if (type.equalsIgnoreCase("java")) {

Cipher cp = Cipher.getInstance(ECB_PKCS1_PADDING);

cp.init(Cipher.ENCRYPT_MODE, keyPublic);

return cp.doFinal(data);

} else {

Cipher cp = Cipher.getInstance(ECB_NO_PADDING);

cp.init(Cipher.ENCRYPT_MODE, keyPublic);

return cp.doFinal(data);

}

}

/**

* 公钥解密

*

* @param data      待解密数据

* @param publicKey 密钥

* @Return byte[] 解密数据

*/

public static byte[] decryptByPublicKey(String type, byte[] data, byte[] publicKey) throws Exception {

// 得到公钥

X509EncodedKeySpec keySpec = new X509EncodedKeySpec(publicKey);

KeyFactory kf = KeyFactory.getInstance(RSA);

PublicKey keyPublic = kf.generatePublic(keySpec);

// 数据解密

if (type.equalsIgnoreCase("java")) {

Cipher cipher = Cipher.getInstance(ECB_PKCS1_PADDING);

cipher.init(Cipher.DECRYPT_MODE, keyPublic);

return cipher.doFinal(data);

} else {

Cipher cipher = Cipher.getInstance(RSA);

cipher.init(Cipher.DECRYPT_MODE, keyPublic);

return cipher.doFinal(data);

}

}

// ------------------------------------------------ 私钥 ---------------------------------------

/**

* 私钥加密

*

* @param data       待加密数据

* @param privateKey 密钥

* @return byte[] 加密数据

*/

public static byte[] encryptByPrivateKey(String type, byte[] data, byte[] privateKey) throws Exception {

// 得到私钥

PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(privateKey);

KeyFactory kf = KeyFactory.getInstance(RSA);

PrivateKey keyPrivate = kf.generatePrivate(keySpec);

// 数据加密

if (type.equalsIgnoreCase("java")) {

Cipher cipher = Cipher.getInstance(ECB_PKCS1_PADDING);

cipher.init(Cipher.ENCRYPT_MODE, keyPrivate);

return cipher.doFinal(data);

} else {

Cipher cipher = Cipher.getInstance(ECB_NO_PADDING);

cipher.init(Cipher.ENCRYPT_MODE, keyPrivate);

return cipher.doFinal(data);

}

}

/**

* 使用私钥进行解密

*/

public static byte[] decryptByPrivateKey(String type, byte[] encrypted, byte[] privateKey) throws Exception {

// 得到私钥

PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(privateKey);

KeyFactory kf = KeyFactory.getInstance(RSA);

PrivateKey keyPrivate = kf.generatePrivate(keySpec);

// 解密数据

if (type.equalsIgnoreCase("java")) {

Cipher cp = Cipher.getInstance(ECB_PKCS1_PADDING);

cp.init(Cipher.DECRYPT_MODE, keyPrivate);

return cp.doFinal(encrypted);

} else {

Cipher cp = Cipher.getInstance(RSA);

cp.init(Cipher.DECRYPT_MODE, keyPrivate);

return cp.doFinal(encrypted);

}

}

}

DES

public class DESUtil {

private final static String HEX = "0123456789ABCDEF";

//DES是加密方式 CBC是工作模式 PKCS5Padding是填充模式

private final static String TRANSFORMATION = "DES/CBC/PKCS5Padding";

//初始化向量参数，AES 为16bytes. DES 为8bytes.

private final static String IVPARAMETERSPEC = "01020304";

//DES是加密方式

private final static String ALGORITHM = "DES";

// SHA1PRNG 强随机种子算法, 要区别4.2以上版本的调用方法

private static final String SHA1PRNG = "SHA1PRNG";

// ------------------------------------- 静态 --------------------------------------------------

/**

* DES 加密

*

* @param message 原文

* @param key     密钥,长度不能够小于8位

* @return

* @throws Exception

*/

public static String desEncrypt(String message, String key) throws Exception {

Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");

DESKeySpec desKeySpec = new DESKeySpec(key.getBytes("UTF-8"));

SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");

SecretKey secretKey = keyFactory.generateSecret(desKeySpec);

IvParameterSpec iv = new IvParameterSpec(key.getBytes("UTF-8"));

cipher.init(Cipher.ENCRYPT_MODE, secretKey, iv);

byte[] encryptbyte = cipher.doFinal(message.getBytes());

return new String(Base64.encode(encryptbyte, Base64.DEFAULT)).trim();

}

/**

* DES解密

*

* @param message 密文

* @param key     密钥,长度不能够小于8位

* @return

* @throws Exception

*/

public static String desDecrypt(String message, String key) throws Exception {

byte[] bytesrc = Base64.decode(message.getBytes(), Base64.DEFAULT);

Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");

DESKeySpec desKeySpec = new DESKeySpec(key.getBytes("UTF-8"));

SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");

SecretKey secretKey = keyFactory.generateSecret(desKeySpec);

IvParameterSpec iv = new IvParameterSpec(key.getBytes("UTF-8"));

cipher.init(Cipher.DECRYPT_MODE, secretKey, iv);

byte[] retByte = cipher.doFinal(bytesrc);

return new String(retByte);

}

// ------------------------------------- 动态 --------------------------------------------------

/*

* 生成随机数，可以当做动态的密钥 加密和解密的密钥必须一致，不然将不能解密

*/

public static String generateKey() {

try {

SecureRandom localSecureRandom = SecureRandom.getInstance(SHA1PRNG);

byte[] bytes_key = new byte[20];

localSecureRandom.nextBytes(bytes_key);

String str_key = toHex(bytes_key);

return str_key;

} catch (Exception e) {

e.printStackTrace();

}

return null;

}

// 对密钥进行处理(方式一)

@SuppressLint("ObsoleteSdkInt")

private static Key getRawKey(String key) throws Exception {

KeyGenerator kgen = KeyGenerator.getInstance(ALGORITHM);

//for android

SecureRandom sr = null;

// 在4.2以上版本中，SecureRandom获取方式发生了改变

if (android.os.Build.VERSION.SDK_INT >= 17) {

sr = SecureRandom.getInstance(SHA1PRNG, "Crypto");

} else {

sr = SecureRandom.getInstance(SHA1PRNG);

}

// for Java

// secureRandom = SecureRandom.getInstance(SHA1PRNG);

sr.setSeed(key.getBytes());

kgen.init(64, sr); //DES固定格式为64bits，即8bytes。

SecretKey skey = kgen.generateKey();

byte[] raw = skey.getEncoded();

return new SecretKeySpec(raw, ALGORITHM);

}

// 对密钥进行处理(方式二)

private static Key getRawKey2(String key) throws Exception {

DESKeySpec dks = new DESKeySpec(key.getBytes());

SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(ALGORITHM);

return keyFactory.generateSecret(dks);

}

//二进制转字符

public static String toHex(byte[] buf) {

if (buf == null)

return "";

StringBuffer result = new StringBuffer(2 * buf.length);

for (int i = 0; i < buf.length; i++) {

appendHex(result, buf);

}

return result.toString();

}

private static void appendHex(StringBuffer sb, byte b) {

sb.append(HEX.charAt((b >> 4) & 0x0f)).append(HEX.charAt(b & 0x0f));

}

/**

* DES算法，加密

*

* @param data 待加密字符串

* @param key  加密私钥，长度不能够小于8位

* @return 加密后的字节数组，一般结合Base64编码使用

*/

public static String encode(String key, String data) {

return encode(key, data.getBytes());

}

/**

* DES算法，加密

*

* @param data 待加密字符串

* @param key  加密私钥，长度不能够小于8位

* @return 加密后的字节数组，一般结合Base64编码使用

*/

public static String encode(String key, byte[] data) {

try {

Cipher cipher = Cipher.getInstance(TRANSFORMATION);

IvParameterSpec iv = new IvParameterSpec(IVPARAMETERSPEC.getBytes());

cipher.init(Cipher.ENCRYPT_MODE, getRawKey(key), iv);

byte[] bytes = cipher.doFinal(data);

return Base64.encodeToString(bytes, Base64.DEFAULT);

} catch (Exception e) {

return null;

}

}

/**

* 获取编码后的值

*

* @param key

* @param data

* @return

*/

public static String decode(String key, String data) {

return decode(key, Base64.decode(data, Base64.DEFAULT));

}

/**

* DES算法，解密

*

* @param data 待解密字符串

* @param key  解密私钥，长度不能够小于8位

* @return 解密后的字节数组

*/

public static String decode(String key, byte[] data) {

try {

Cipher cipher = Cipher.getInstance(TRANSFORMATION);

IvParameterSpec iv = new IvParameterSpec(IVPARAMETERSPEC.getBytes());

cipher.init(Cipher.DECRYPT_MODE, getRawKey(key), iv);

byte[] original = cipher.doFinal(data);

String originalString = new String(original);

return originalString;

} catch (Exception e) {

return null;

}

}

}

AES

public class AESUtil {

private final static String HEX = "0123456789ABCDEF";

//AES是加密方式 CBC是工作模式 PKCS5Padding是填充模式

private static final String CBC_PKCS5_PADDING = "AES/CBC/PKCS5Padding";

//AES 加密

private static final String AES = "AES";

// SHA1PRNG 强随机种子算法, 要区别4.2以上版本的调用方法

private static final String SHA1PRNG = "SHA1PRNG";

/**

* @return 动态生成秘钥

*/

public static String generateKey() {

try {

SecureRandom localSecureRandom = SecureRandom.getInstance(SHA1PRNG);

byte[] bytes_key = new byte[20];

localSecureRandom.nextBytes(bytes_key);

String str_key = toHex(bytes_key);

return str_key;

} catch (Exception e) {

e.printStackTrace();

}

return null;

}

/**

* 对秘钥进行处理

*

* @param seed 动态生成的秘钥

* @return

* @throws Exception

*/

private static byte[] getRawKey(byte[] seed) throws Exception {

KeyGenerator kgen = KeyGenerator.getInstance(AES);

//for android

SecureRandom sr = null;

// 在4.2以上版本中，SecureRandom获取方式发生了改变

int sdk_version = android.os.Build.VERSION.SDK_INT;

// Android  6.0 以上

if (sdk_version > 23) {

sr = SecureRandom.getInstance(SHA1PRNG, new CryptoProvider());

//4.2及以上

} else if (android.os.Build.VERSION.SDK_INT >= 17) {

sr = SecureRandom.getInstance(SHA1PRNG, "Crypto");

} else {

sr = SecureRandom.getInstance(SHA1PRNG);

}

// for Java

// secureRandom = SecureRandom.getInstance(SHA1PRNG);

sr.setSeed(seed);

//256 bits or 128 bits,192bits

kgen.init(128, sr);

//AES中128位密钥版本有10个加密循环，192比特密钥版本有12个加密循环，256比特密钥版本则有14个加密循环。

SecretKey skey = kgen.generateKey();

byte[] raw = skey.getEncoded();

return raw;

}

/**

* 加密

*

* @param key

* @param cleartext

* @return

*/

public static String encrypt(String key, String cleartext) {

if (TextUtils.isEmpty(cleartext)) {

return cleartext;

}

try {

byte[] result = encrypt(key, cleartext.getBytes());

return new String(Base64.encode(result, Base64.DEFAULT));

} catch (Exception e) {

e.printStackTrace();

}

return null;

}

private static byte[] encrypt(String key, byte[] clear) throws Exception {

byte[] raw = getRawKey(key.getBytes());

SecretKeySpec skeySpec = new SecretKeySpec(raw, AES);

Cipher cipher = Cipher.getInstance(CBC_PKCS5_PADDING);

cipher.init(Cipher.ENCRYPT_MODE, skeySpec, new IvParameterSpec(new byte[cipher.getBlockSize()]));

byte[] encrypted = cipher.doFinal(clear);

return encrypted;

}

/**

* 解密

*

* @param key

* @param encrypted

* @return

*/

public static String decrypt(String key, String encrypted) {

if (TextUtils.isEmpty(encrypted)) {

return encrypted;

}

try {

byte[] enc = Base64.decode(encrypted, Base64.DEFAULT);

byte[] result = decrypt(key, enc);

return new String(result);

} catch (Exception e) {

e.printStackTrace();

}

return null;

}

private static byte[] decrypt(String key, byte[] encrypted) throws Exception {

byte[] raw = getRawKey(key.getBytes());

SecretKeySpec skeySpec = new SecretKeySpec(raw, AES);

Cipher cipher = Cipher.getInstance(CBC_PKCS5_PADDING);

cipher.init(Cipher.DECRYPT_MODE, skeySpec, new IvParameterSpec(new byte[cipher.getBlockSize()]));

byte[] decrypted = cipher.doFinal(encrypted);

return decrypted;

}

// ----------------------------------------------- 辅助方法 ------------------------------------

//二进制转字符

public static String toHex(byte[] buf) {

if (buf == null)

return "";

StringBuffer result = new StringBuffer(2 * buf.length);

for (int i = 0; i < buf.length; i++) {

appendHex(result, buf);

}

return result.toString();

}

private static void appendHex(StringBuffer sb, byte b) {

sb.append(HEX.charAt((b >> 4) & 0x0f)).append(HEX.charAt(b & 0x0f));

}

// 增加  CryptoProvider  类

public static class CryptoProvider extends Provider {

/**

* Creates a Provider and puts parameters

*/

public CryptoProvider() {

super("Crypto", 1.0, "HARMONY (SHA1 digest; SecureRandom; SHA1withDSA signature)");

put("SecureRandom.SHA1PRNG",

"org.apache.harmony.security.provider.crypto.SHA1PRNG_SecureRandomImpl");

put("SecureRandom.SHA1PRNG ImplementedIn", "Software");

}

}

}