android典型代码系列(三十)------DES加密算法
16lz
2021-01-23
DES加密算法
import java.security.InvalidKeyException;import java.security.Key;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;import org.apache.commons.codec.binary.Base64;public class DES { public DES() {} public static DES getInstance(String key) throws NoSuchPaddingException, NoSuchAlgorithmException { return getInstance(getKeyByStr(key)); } public static DES getInstance(byte key[]) throws NoSuchPaddingException, NoSuchAlgorithmException { DES des = new DES(); if (des.key == null) { SecretKeySpec spec = new SecretKeySpec(key, "DES"); des.key = spec; } des.cipher = Cipher.getInstance("DES/ECB/PKCS5Padding"); return des; } public byte[] encrypt(byte b[]) throws InvalidKeyException, BadPaddingException, IllegalBlockSizeException, IllegalStateException { byte byteFina[] = null; cipher.init(1, key); byteFina = cipher.doFinal(b); return byteFina; } public byte[] decrypt(byte b[]) throws InvalidKeyException, BadPaddingException, IllegalBlockSizeException, IllegalStateException { byte byteFina[] = null; cipher.init(2, key); byteFina = cipher.doFinal(b); return byteFina; } public static byte[] getKeyByStr(String str) { byte bRet[] = new byte[str.length() / 2]; for (int i = 0; i < str.length() / 2; i++) { Integer itg = new Integer(16 * getChrInt(str.charAt(2 * i)) + getChrInt(str.charAt(2 * i + 1))); bRet[i] = itg.byteValue(); } return bRet; } private static int getChrInt(char chr) { int iRet = 0; if (chr == "0".charAt(0)) iRet = 0; if (chr == "1".charAt(0)) iRet = 1; if (chr == "2".charAt(0)) iRet = 2; if (chr == "3".charAt(0)) iRet = 3; if (chr == "4".charAt(0)) iRet = 4; if (chr == "5".charAt(0)) iRet = 5; if (chr == "6".charAt(0)) iRet = 6; if (chr == "7".charAt(0)) iRet = 7; if (chr == "8".charAt(0)) iRet = 8; if (chr == "9".charAt(0)) iRet = 9; if (chr == "A".charAt(0)) iRet = 10; if (chr == "B".charAt(0)) iRet = 11; if (chr == "C".charAt(0)) iRet = 12; if (chr == "D".charAt(0)) iRet = 13; if (chr == "E".charAt(0)) iRet = 14; if (chr == "F".charAt(0)) iRet = 15; return iRet; } private Key key; private Cipher cipher; /** * @interpret 进行base64加密操作 * @param text * @param keyString * @return String */ public String encrypt(String text, String keyString) { String body = null; try { DES des = DES.getInstance(keyString); byte[] b = des.encrypt(text.getBytes("UTF8")); body = new String(Base64.encodeBase64(b)); } catch (Exception ex) { } return body; } /** * @interpret 进行base64进行解密 * @param text * @param keyString * @return String */ public String decrypt(String text, String keyString) { String body = null; try { DES des = DES.getInstance(keyString); byte[] b = Base64.decodeBase64(text.getBytes()); body = new String(des.decrypt(b), "UTF8"); } catch (Exception e) { e.printStackTrace(); } return body; } public String authcode(String content, String operation, String key){ String encontent = null; if (operation != null && operation.equals("DECODE")) { encontent = encrypt(content,key); } else if (operation != null && operation.equals("ENCODE")) { encontent = decrypt(content,key); } return encontent; } public static void main(String[] args) { DES des = new DES(); System.out.println(des.authcode("wewweewewew=","DECODE","0102030405060708")); System.out.println(des.authcode("d8fPhfd9JkW99p8aqhtVIA==","ENCODE","0102030405060708")); }}更多相关文章
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