JAVA 加解密

如此用法：传一个字符串进去

password = password.toLowerCase();
  String _password = Encrypter.encrypter(password);
  _password = TextUtils.isEmpty(_password) ? "" : _password;

 

 

 

Encrypter此类：

import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;

import javax.crypto.BadPaddingException;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;

public class Encrypter {
    public static final String SECRET_KEY = "PkmJygVfrDxsDeeD";

    /*
     * Encrypter method
     *
     * @param password, public text need to be encrypted
     *
     * @return encrypt text
     */
    public static String encrypter(String str) {
        String string = null;

        try {
            string = AES128_ECB_HEX.encode(str.getBytes(), 0, SECRET_KEY.getBytes(), 0);
        } catch (InvalidKeyException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (BadPaddingException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IllegalBlockSizeException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (NoSuchAlgorithmException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (NoSuchPaddingException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return string;
    }

    /*
     * Decrypter method
     *
     * @param password, secret text need to be decrypted
     *
     * @return public text
     */
    public static String decrypter(String str) {
        String string = "";

        try {
            string = new String(AES128_ECB_HEX.decode(str, SECRET_KEY.getBytes(), 0));
        } catch (InvalidKeyException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (BadPaddingException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IllegalBlockSizeException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (NoSuchAlgorithmException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (NoSuchPaddingException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return string;
    }
}

 

AES128_ECB_HEX此类：

import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import javax.crypto.BadPaddingException;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;

public final class AES128_ECB_HEX {
    /*
     * encode method
     *
     * @param btPlain, public text need to be encrypted
     *
     * @param iLen, the length of public text锟斤拷it equals the length of btPlain
     * when is 0
     *
     * @param btKey, secret key
     *
     * @param iKeyLen, length of secret key锟斤拷it equals the length of btKey when
     * is 0
     */
    public static String encode(byte[] btPlain, int iLen, byte[] btKey, int iKeyLen)
    throws BadPaddingException, IllegalBlockSizeException, InvalidKeyException,
    NoSuchAlgorithmException, NoSuchPaddingException {
        return HEX.encode(AES128_ECB.encode(btPlain, iLen, btKey, iKeyLen), 0);
    }

    /*
     * decode method
     *
     * @param stHex, hex cryptograph
     *
     * @param btKey, secret key
     *
     * @param iKeyLen, length of secret key锟斤拷it equals the length of btKey when
     * is 0
     */
    public static byte[] decode(String stHex, byte[] btKey, int iKeyLen)
    throws BadPaddingException, IllegalBlockSizeException, InvalidKeyException,
    NoSuchAlgorithmException, NoSuchPaddingException {
        return AES128_ECB.decode(HEX.decode(stHex), 0, btKey, iKeyLen);
    }

    private AES128_ECB_HEX() {}
}

此类HEX：

public class HEX {
    /*
     * encode method
     *
     * @param btData, public text need to be hex
     *
     * @param iLen, the length of public text锟斤拷it equals the length of btData
     * when is 0
     */
    public static String encode(byte[] btData, int iLen) {
        String l_stTmp = null;
        StringBuffer l_stHex = new StringBuffer();
        int ii;

        if (btData == null) {
            return null;
        }

        if ((iLen <= 0) || (iLen > btData.length)) {
            iLen = btData.length;
        }

        for (ii = 0; ii < iLen; ii++) {
            l_stTmp = Integer.toHexString(btData[ii] & 0xFF);

            if (l_stTmp.length() == 1) {
                l_stTmp = "0" + l_stTmp;
            }

            l_stHex.append(l_stTmp.toUpperCase());
        }

        return l_stHex.toString();
    }

    /*
     * decode method
     *
     * @return null if conversion failed
     */
    public static byte[] decode(String stData) {
        byte[] l_btData = null;
        byte[] l_btTmp = null;
        String l_stData = null;
        int l_iLen;
        int ii;
        int jj;
        int kk;
        char l_cTmp;

        if (stData == null) {
            return null;
        }

        l_iLen = stData.length();

        if ((l_iLen % 2) != 0) {
            return null;
        }

        l_stData = stData.toUpperCase();

        for (ii = 0; ii < l_iLen; ii++) {
            l_cTmp = l_stData.charAt(ii);

            if (!((('0' <= l_cTmp) && (l_cTmp <= '9')) || (('A' <= l_cTmp) && (l_cTmp <= 'F')))) {
                return null;
            }
        }

        l_iLen /= 2;

        l_btData = new byte[l_iLen];

        l_btTmp = new byte[2];

        for (ii = 0, jj = 0, kk = 0; ii < l_iLen; ii++) {
            l_btTmp[0] = (byte) (l_stData.charAt(jj++));
            l_btTmp[1] = (byte) (l_stData.charAt(jj++));

            for (kk = 0; kk < 2; kk++) {
                if (('A' <= l_btTmp[kk]) && (l_btTmp[kk] <= 'F')) {
                    l_btTmp[kk] -= 55;
                } else {
                    l_btTmp[kk] -= 48;
                }
            }

            l_btData[ii] = (byte) ((l_btTmp[0] << 4) | l_btTmp[1]);
        }

        return l_btData;
    }

    private HEX() {}
}

此类：AES128_ECB

import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.SecretKeySpec;

public final class AES128_ECB {
    private static final int AES_128_KEY_LEN = 16; // 128 bit

    /*
     * encode method
     *
     * @param btPlain, public text need to be encrypted
     *
     * @param iLen, the length of public text锟斤拷it equals the length of btPlain
     * when is 0
     *
     * @param btKey, secret key
     *
     * @param iKeyLen, length of secret key锟斤拷it equals the length of btKey when
     * is 0
     */
    public static byte[] encode(byte[] btPlain, int iLen, byte[] btKey, int iKeyLen)
    throws BadPaddingException, IllegalBlockSizeException, InvalidKeyException,
    NoSuchAlgorithmException, NoSuchPaddingException {
        return encode_decode(btPlain, iLen, btKey, iKeyLen, 0);
    }

    /*
     * decode method
     *
     * @param btCipher, secret text
     *
     * @param iLen, the length of secret text锟斤拷it equals the length of btCipher
     * when is 0
     *
     * @param btKey, secret key
     *
     * @param iKeyLen, length of secret key锟斤拷it equals the length of btKey when
     * is 0
     */
    public static byte[] decode(byte[] btCipher, int iLen, byte[] btKey, int iKeyLen)
    throws BadPaddingException, IllegalBlockSizeException, InvalidKeyException,
    NoSuchAlgorithmException, NoSuchPaddingException {
        return encode_decode(btCipher, iLen, btKey, iKeyLen, 1);
    }

    private static byte[] encode_decode(byte[] btData, int iLen, byte[] btKey, int iKeyLen,
                                        int iFlag) throws BadPaddingException, IllegalBlockSizeException,
    InvalidKeyException,
    NoSuchAlgorithmException, NoSuchPaddingException {
        int ii;
        int l_iMode;

        byte[] l_btKey = null;
        Cipher l_oCipher = null;

        if ((btData == null) || (btKey == null)) {
            return null;
        }

        if ((iLen <= 0) || (iLen > btData.length)) {
            iLen = btData.length;
        }

        if ((iKeyLen <= 0) || (iKeyLen > btKey.length)) {
            iKeyLen = btKey.length;
        }

        if (iKeyLen > AES_128_KEY_LEN) {
            // 16 Bytes
            iKeyLen = AES_128_KEY_LEN; // 16 Bytes
        }

        l_btKey = new byte[AES_128_KEY_LEN]; // 16 Bytes

        for (ii = 0; ii < AES_128_KEY_LEN; ii++) {
            l_btKey[ii] = (byte) 0x00;
        }

        for (ii = 0; ii < iKeyLen; ii++) {
            l_btKey[ii] = btKey[ii];
        }

        l_oCipher = Cipher.getInstance("AES/ECB/PKCS5Padding");

        if (iFlag == 0) {
            l_iMode = Cipher.ENCRYPT_MODE;
        } else {
            l_iMode = Cipher.DECRYPT_MODE;
        }

        l_oCipher.init(l_iMode, new SecretKeySpec(l_btKey, 0, AES_128_KEY_LEN, "AES"));

        return l_oCipher.doFinal(btData, 0, iLen);
    }

    private AES128_ECB() {}
}

 

解密

password = Encrypter.decrypter(password);
以上所有都是加解密用到的类，自己也不懂很多代码为什么这么写

评论

2 楼 jack_ye 2013-06-18  

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1 楼 jack_ye 2013-06-18  

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