Java 加密之Desede加密(不用Base64)
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项目中用到了DES加密,经过一番搜索网上找到不少代码,但都用到了Base64编码,可是这个东西是sun自用的包,不推荐使用的,心理别扭就自己找到了不用它的方法。代码如下:
import java.io.UnsupportedEncodingException;
import java.math.BigInteger;
import java.security.spec.KeySpec;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESedeKeySpec;
import _interface.IEncryptor;
public class DESEDEEncryptor implements IEncryptor {
static Cipher ecipher;
static Cipher dcipher;
//PBKey length should be 24 at least
private String PBKey="Qujsdgwegw/wegwesOOOOKKKKvxSSSS";
public DESEDEEncryptor(String PBKey) throws Exception {
KeySpec ks = new DESedeKeySpec(PBKey.getBytes("UTF8"));
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DESede");
SecretKey key = keyFactory.generateSecret(ks);
ecipher = Cipher.getInstance("DESede");
dcipher = Cipher.getInstance("DESede");
ecipher.init(Cipher.ENCRYPT_MODE, key);
dcipher.init(Cipher.DECRYPT_MODE, key);
}
public DESEDEEncryptor() throws Exception {
new DESEDEEncryptor(PBKey);
}
@Override
public String encrypt(String input) {
try {
// Encode the string into bytes using utf-8
byte[] utf8 = input.getBytes("UTF8");
// Encrypt
byte[] enc = ecipher.doFinal(utf8);
//关键就在这了,要是直接把byte转成string会出现乱码,因为加密后的byte数组有的不在ASCC编码中,所以用了BigInteger
return new BigInteger(1,enc).toString(16);
//return new sun.misc.BASE64Encoder().encodeBuffer(enc);
} catch (javax.crypto.BadPaddingException e) {
} catch (IllegalBlockSizeException e) {
} catch (UnsupportedEncodingException e) {
} catch (java.io.IOException e) {
}
return null;
}
@Override
public String decrypt(String input) {
try {
// Decode base64 to get bytes
//byte[] dec = new sun.misc.BASE64Decoder().decodeBuffer(input);
byte[] dec = hexToBytes(input.toCharArray());
// Decrypt
byte[] utf8 = dcipher.doFinal(dec);
// Decode using utf-8
return new String(utf8,"UTF8");
} catch (javax.crypto.BadPaddingException e) {
e.printStackTrace();
} catch (IllegalBlockSizeException e) {
e.printStackTrace();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (java.io.IOException e) {
e.printStackTrace();
}
return null;
}
private byte[] hexToBytes(char[] hex) {
int length = hex.length / 2;
byte[] raw = new byte[length];
for (int i = 0; i < length; i++) {
int high = Character.digit(hex[i * 2], 16);
int low = Character.digit(hex[i * 2 + 1], 16);
int value = (high << 4) | low;
if (value > 127)
value -= 256;
raw[i] = (byte) value;
}
return raw;
}
}
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