Java Utililty Methods String Encrypt

List of utility methods to do String Encrypt

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Description

The list of methods to do String Encrypt are organized into topic(s).

Method

Stringencrypt(String str)
Encrypt the given string in a way which anybody having access to this method algorithm can easily decrypt. 
if (str == null) {
    return null;
StringBuffer buf = new StringBuffer();
for (int i = 0; i < str.length(); i++) {
    char c = str.charAt(i);
    if (c >= SHIFTS.length) {
        throw new IllegalArgumentException(
...
StringEncrypt(String str, String salt)
Encrypt 
String encoderText = "lsedfoglkwjemc-091324jlkmsda-0sd=1234;l;lsdkOPIER203-4LKJSLDJAS0D925JKNNC,MANSLDJQ32ELK1N4SAIp089er0234lkjo9df82l3kjlknf,nzxc,mn;lasdj9wquelq;d]qowe[;wq;qkwellsdkfj0-0POPOAR0W8RPOp-02@#$sdklj$#)0asdlksadLKJFA9820934)(&$3ij09sdj34-sdfj2po345-09dlkfjlkv,mxncv;laskdkl/a;au093hakjh2389~!@%&*%#&^539478(*&)^(&^_*8-*_+++|78w3ihsdnmnclksdj)(*#%*_@$(+#@$)&@#^*&^#@$()(*#@$HDFIkdhfgkjh098k;ldsk.sdv.c,msd;flkp0w34;2lk-=sd0p121o39-werl2k3;4lj09sdflskjlekfj,mv,mcxvjlksjdflksjdl*(#@!&akhduyqweperilmmdxcasnd*(#@9879327kjhasudfewr kwehriwueyrhc ausdgiq7w8e71 cdsh93ol2q32879y8932qwhdkjanhdskjaoe*&w#jh$)(*dsFshc na89wue32e981yewher12(*&#quds)(*i3o1928osaihdaklsdkalkduqowe3290874kljhklasdhlijhqweio4hwe89(*$#$eriho349oij(#*q$OIJHO)(&*#$_)(IUDSOIUoiOIUSAODFU034liusdrogiuet0lsdmc,.mg;lq-091lk3l;kjsdf--123098fe*(JOKJSFD983345oihjdp0(#*$&#@!HKJH!(@#*&ioysdk@#)uhOA7E98R7239845K(*&(#@*$&HKFDJHWERYIWoi)(*&#@&^%@!dsfoi;.;,p[osklejr230897*(&we2&^%@78*(&#@!(7~&*~^@*&^#(*&auroiqkjwrhoasdf89qlrlkjpour09werk23jh";
encoderText += salt;
int seed = (int) Random(255);
int pre = seed & 3;
int len = str.length();
int elen = encoderText.length();
int i, j;
String ret = "";
...
byte[]encrypt(String string)
Encrypts the string into a byte array. 
byte[] buffer = new byte[string.length()];
byte key = (byte) KEY;
for (int i = 0; i < string.length(); i++) {
    buffer[i] = (byte) (string.charAt(i) ^ key);
    key = buffer[i];
return buffer;
Stringencrypt(String string)
encrypt 
char chars[] = string.toCharArray();
int len, i = 0;
for (len = chars.length; i < len; i++)
    chars[i] = (char) (~chars[i]);
return new String(chars);
Stringencrypt0(final byte[] result)
encrypt 
String encodeStr = new String(Base64.getEncoder().encode(parseByte2HexStr(result).getBytes()));
final int idx;
if ((idx = encodeStr.indexOf('=')) > -1) {
    final String tmp = encodeStr.substring(0, idx);
    final int len = encodeStr.substring(idx).length();
    encodeStr = tmp + len;
} else {
    encodeStr += '0';
...
StringencryptBankCardNo(String cardNo)
encrypt Bank Card No 
if (cardNo == null || cardNo.length() <= DEFAULT_CARD_NUMBER_DISPLAY_LENGTH) {
    return cardNo;
String preStr = cardNo.substring(DEFAULT_CARD_NUMBER_DISPLAY_LENGTH,
        cardNo.length() - DEFAULT_CARD_NUMBER_DISPLAY_LENGTH);
preStr = preStr.replaceAll(".", "*");
return cardNo.substring(0, DEFAULT_CARD_NUMBER_DISPLAY_LENGTH).concat(preStr)
        .concat(cardNo.substring(cardNo.length() - DEFAULT_CARD_NUMBER_DISPLAY_LENGTH));
...
StringencryptBankCardNoLast4Bits(String cardNo)
encrypt Bank Card No Last Bits 
if (cardNo == null || cardNo.length() <= DEFAULT_CARD_NUMBER_DISPLAY_LENGTH) {
    return cardNo;
return cardNo.substring(cardNo.length() - DEFAULT_CARD_NUMBER_DISPLAY_LENGTH);
byte[]encryptBytes(final byte[] b, final int i)
encrypt Bytes 
int startKey = i * 12345;
int mulKey = startKey >>> 8;
int addKey = startKey >>> 16;
int j;
for (j = 0; j < b.length; j++) {
    b[j] = (byte) (b[j] ^ (startKey >>> 8));
    startKey = (b[j] + startKey) * mulKey + addKey;
return b;
StringencryptChar(String caracter, int variable, int indice)
Encriptar caracter. 
int ind;
if (searchPattern.indexOf(caracter) != -1) {
    ind = (searchPattern.indexOf(caracter) + variable + indice) % searchPattern.length();
    return encryptPattern.substring(ind, ind + 1);
return caracter;
StringEncryptDecrypt(String value)
Encrypt Decrypt 
byte[] aCrypt = { 0x34 };
byte[] aInput = value.getBytes();
int iLength = aInput.length;
byte[] aOutput = new byte[iLength];
for (int pos = 0; pos < iLength; ++pos) {
    aOutput[pos] = (byte) (aInput[pos] ^ aCrypt[0]);
return new String(aOutput);
...