常用加密解密算法

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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;        }    }}

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