AES加密算法
package com.xxx.util;
import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
/** * @author YLBF * * @category 类说明 AES算法 */
public class AESCoder {
private static String encoding = "UTF-8";
public static String encrypt(String seed, String cleartext)
throws Exception {
byte[] rawKey = getRawKey(seed.getBytes());
byte[] result = encrypt(rawKey, cleartext.getBytes());
return toHex(result);
}
public static String decrypt(String seed, String encrypted)
throws Exception {
byte[] rawKey = getRawKey(seed.getBytes());
byte[] enc = toByte(encrypted);
byte[] result = decrypt(rawKey, enc);
return new String(result);
}
private static byte[] getRawKey(byte[] seed) throws Exception {
KeyGenerator kgen = KeyGenerator.getInstance("AES");
SecureRandom sr = SecureRandom.getInstance("SHA1PRNG", "Crypto");
sr.setSeed(seed);
kgen.init(128, sr); // 192 and 256 bits may not be available
SecretKey skey = kgen.generateKey();
byte[] raw = skey.getEncoded();
return raw;
}
private static byte[] encrypt(byte[] raw, byte[] clear) throws Exception {
SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.ENCRYPT_MODE, skeySpec, new IvParameterSpec(
new byte[cipher.getBlockSize()]));
byte[] encrypted = cipher.doFinal(clear);
return encrypted;
}
private static byte[] decrypt(byte[] raw, byte[] encrypted)
throws Exception {
SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.DECRYPT_MODE, skeySpec, new IvParameterSpec(
new byte[cipher.getBlockSize()]));
byte[] decrypted = cipher.doFinal(encrypted);
return decrypted;
}
private static String toHex(String txt) {
return toHex(txt.getBytes());
}
private static String fromHex(String hex) {
return new String(toByte(hex));
}
private static byte[] toByte(String hexString) {
int len = hexString.length() / 2;
byte[] result = new byte[len];
for (int i = 0; i < len; i++)
result[i] = Integer.valueOf(hexString.substring(2 * i, 2 * i + 2),
16).byteValue();
return result;
}
private 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[i]);
}
return result.toString();
}
private final static String HEX = "0123456789ABCDEF";
private static void appendHex(StringBuffer sb, byte b) {
sb.append(HEX.charAt((b >> 4) & 0x0f)).append(HEX.charAt(b & 0x0f));
}
}
DES算法
package com.xxx.util;
import java.security.*;
import javax.crypto.Cipher;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import android.util.Base64;
/** * @author YLBF * * @category 类说明 Des 64位算法 */
public class DESCoder {
private static String encoding = "UTF-8";
// 密钥
private String sKey = "";
public DESCoder(String sKey) {
this.sKey = sKey;
}
/** * 加密字符串 */
public String ebotongEncrypto(String str) {
String result = str;
if (str != null && str.length() > 0) {
try {
byte[] encodeByte = symmetricEncrypto(str.getBytes(encoding));
result = Base64.encodeToString(encodeByte, Base64.CRLF);
} catch (Exception e) {
e.printStackTrace();
}
}
return result;
}
/** * 解密字符串 */
public String ebotongDecrypto(String str) {
String result = str;
if (str != null && str.length() > 0) {
try {
byte[] encodeByte = Base64.decode(str, Base64.CRLF);
byte[] decoder = symmetricDecrypto(encodeByte);
result = new String(decoder, encoding);
} catch (Exception e) {
e.printStackTrace();
}
}
return result;
}
/** * 加密byte[] */
public byte[] ebotongEncrypto(byte[] str) {
byte[] result = null;
if (str != null && str.length > 0) {
try {
byte[] encodeByte = symmetricEncrypto(str);
result = Base64.encode(encodeByte, Base64.CRLF);
} catch (Exception e) {
e.printStackTrace();
}
}
return result;
}
/** * 解密byte[] */
public byte[] ebotongDecrypto(byte[] str) {
byte[] result = null;
if (str != null && str.length > 0) {
try {
byte[] encodeByte = Base64.decode(new String(str, encoding), Base64.CRLF);
// byte[] encodeByte = base64decoder.decodeBuffer(new
// String(str));
byte[] decoder = symmetricDecrypto(encodeByte);
result = new String(decoder).getBytes(encoding);
result = new String(decoder).getBytes();
} catch (Exception e) {
e.printStackTrace();
}
}
return result;
}
/** * 对称加密字节数组并返回 * * @param byteSource * 需要加密的数据 * @return 经过加密的数据 * @throws Exception */
public byte[] symmetricEncrypto(byte[] byteSource) throws Exception {
try {
int mode = Cipher.ENCRYPT_MODE;
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
byte[] keyData = sKey.getBytes();
DESKeySpec keySpec = new DESKeySpec(keyData);
Key key = keyFactory.generateSecret(keySpec);
Cipher cipher = Cipher.getInstance("DES");
cipher.init(mode, key);
byte[] result = cipher.doFinal(byteSource);
return result;
} catch (Exception e) {
throw e;
} finally {
}
}
/** * 对称解密字节数组并返回 * * @param byteSource * 需要解密的数据 * @return 经过解密的数据 * @throws Exception */
public byte[] symmetricDecrypto(byte[] byteSource) throws Exception {
try {
int mode = Cipher.DECRYPT_MODE;
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
byte[] keyData = sKey.getBytes();
DESKeySpec keySpec = new DESKeySpec(keyData);
Key key = keyFactory.generateSecret(keySpec);
Cipher cipher = Cipher.getInstance("DES");
cipher.init(mode, key);
byte[] result = cipher.doFinal(byteSource);
return result;
} catch (Exception e) {
throw e;
} finally {
}
}
/** * 散列算法 * * @param byteSource * 需要散列计算的数据 * @return 经过散列计算的数据 * @throws Exception */
public static byte[] hashMethod(byte[] byteSource) throws Exception {
try {
MessageDigest currentAlgorithm = MessageDigest.getInstance("SHA-1");
currentAlgorithm.reset();
currentAlgorithm.update(byteSource);
return currentAlgorithm.digest();
} catch (Exception e) {
throw e;
}
}
}