常用加密工具
2017-10-10 11:19
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开发中,有些数据不希望被看到,需要进行加密:
这里提供一个可用的加密工具
这里提供一个可用的加密工具
import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.OutputStream; import javax.crypto.Cipher; import javax.crypto.spec.IvParameterSpec; import javax.crypto.spec.SecretKeySpec; import com.redoor.rcs.person.PersonItemSetActivity; /** * @preserve public * @author wuchao * */ public class DES { private static final String ALGORITHM = "DES"; private static final String CIPHER = "DES"; private String DEFAULT_KEY = PersonItemSetActivity.KEY_QRCODE_DES_ENCODE; // Des加密解密的密匙 private static byte[] iv = { 1, 2, 3, 4, 5, 6, 7, 8 }; private static final char[] legalChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=" .toCharArray(); /** * 指定密钥构造方法 * */ public DES() { } /** * 指定密钥构造方法 * * @param strKey * 指定的密钥 */ public DES(String strKey) { DEFAULT_KEY = strKey; } /** * data[] * * @param data * @return */ public static String encode(byte[] data) { int start = 0; int len = data.length; StringBuffer buf = new StringBuffer(data.length * 3 / 2); int end = len - 3; int i = start; int n = 0; while (i <= end) { int d = (((data[i]) & 0x0ff) << 16) | (((data[i + 1]) & 0x0ff) << 8) | ((data[i + 2]) & 0x0ff); buf.append(legalChars[(d >> 18) & 63]); buf.append(legalChars[(d >> 12) & 63]); buf.append(legalChars[(d >> 6) & 63]); buf.append(legalChars[d & 63]); i += 3; if (n++ >= 14) { n = 0; buf.append(" "); } } if (i == start + len - 2) { int d = (((data[i]) & 0x0ff) << 16) | (((data[i + 1]) & 255) << 8); buf.append(legalChars[(d >> 18) & 63]); buf.append(legalChars[(d >> 12) & 63]); buf.append(legalChars[(d >> 6) & 63]); buf.append("="); } else if (i == start + len - 1) { int d = ((data[i]) & 0x0ff) << 16; buf.append(legalChars[(d >> 18) & 63]); buf.append(legalChars[(d >> 12) & 63]); buf.append("=="); } return buf.toString(); } public static String parseByte2HexStr(byte buf[]) { StringBuffer sb = new StringBuffer(); for (int i = 0; i < buf.length; i++) { String hex = Integer.toHexString(buf[i] & 0xFF); if (hex.length() == 1) { hex = '0' + hex; } sb.append(hex.toUpperCase()); } return sb.toString(); } public static byte[] decode(String s) { ByteArrayOutputStream bos = new ByteArrayOutputStream(); try { decode(s, bos); } catch (IOException e) { throw new RuntimeException(); } byte[] decodedBytes = bos.toByteArray(); try { bos.close(); bos = null; } catch (IOException ex) { // System.err.println("Error while decoding BASE64: " + // ex.toString()); } return decodedBytes; } private static void decode(String s, OutputStream os) throws IOException { int i = 0; int len = s.length(); while (true) { while (i < len && s.charAt(i) <= ' ') i++; if (i == len) break; int tri = (decode(s.charAt(i)) << 18) + (decode(s.charAt(i + 1)) << 12) + (decode(s.charAt(i + 2)) << 6) + (decode(s.charAt(i + 3))); os.write((tri >> 16) & 255); if (s.charAt(i + 2) == '=') break; os.write((tri >> 8) & 255); if (s.charAt(i + 3) == '=') break; os.write(tri & 255); i += 4; } } private static int decode(char c) { if (c >= 'A' && c <= 'Z') return (c) - 65; else if (c >= 'a' && c <= 'z') return (c) - 97 + 26; else if (c >= '0' && c <= '9') return (c) - 48 + 26 + 26; else switch (c) { case '+': return 62; case '/': return 63; case '=': return 0; default: throw new RuntimeException("unexpected code: " + c); } } public String encrypt(String strIn, String key, String encoding) throws Exception { return encryptDES(strIn, key, encoding); } public String decrypt(String strIn, String key, String encoding) throws Exception { return decryptDES(strIn, key, encoding); } private String encryptDES(String encryptString, String encryptKey, String encoding) throws Exception { IvParameterSpec zeroIv = new IvParameterSpec(iv); SecretKeySpec key = new SecretKeySpec(encryptKey.getBytes(), ALGORITHM); Cipher cipher = Cipher.getInstance(CIPHER); cipher.init(Cipher.ENCRYPT_MODE, key);//ecb PKS7|PKCS5(DEFAULT) byte[] encryptedData = cipher.doFinal(encryptString.getBytes(encoding)); System.out.println(bytes2HexString(encryptedData)); return Base64.encode(encryptedData); } private String decryptDES(String decryptString, String decryptKey, String encoding) throws Exception { byte[] byteMi = Base64.decode(decryptString); IvParameterSpec zeroIv = new IvParameterSpec(iv); SecretKeySpec key = new SecretKeySpec(decryptKey.getBytes(), ALGORITHM); Cipher cipher = Cipher.getInstance(CIPHER); cipher.init(Cipher.DECRYPT_MODE, key); byte decryptedData[] = cipher.doFinal(byteMi); return new String(decryptedData, encoding); } /** 使用BASE64时的字符集编码. */ public static final String CHARSET = "UTF-8"; /** * 先DEC加密,再用Base64转换 。JDK默认: ECB 加密模式和 PKCS#5 填充方式. * * @param input * the input * @return the string * @throws Exception * the exception */ public String encryptDESBeas64(String input) throws CoderException { try { return encryptDES(input, DEFAULT_KEY, CHARSET); } catch (Exception e) { throw new CoderException(e); } } /** * 先用Base64转换,再DEC解密 。JDK默认: ECB 加密模式和 PKCS#5 填充方式. * * @param input * the input * @return the string * @throws Exception * the exception */ public String decryptBeas64DES(String input) throws CoderException { try { return decryptDES(input, DEFAULT_KEY, CHARSET); } catch (Exception e) { throw new CoderException(e); } } public static String bytes2HexString(byte[] b) { StringBuffer result = new StringBuffer(); String hex; for (int i = 0; i < b.length; i++) { hex = Integer.toHexString(b[i] & 0xFF); if (hex.length() == 1) { hex = '0' + hex; } result.append(hex.toUpperCase()); } return result.toString(); } public static void main(String args[]) { DES des = new DES("10739360"); try { String account = "39900378945"; account = des.encryptDESBeas64(account); // account = des.encode(account.getBytes()); System.out.println("account密文=" + account); account = des.decryptBeas64DES(account); System.out.println("account明文=" + account); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } }
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