在网上查了很多的rsa试过好多种方法，加密和解密多少都有点瑕疵
下面总结下 直接使用copy大法
干货
首先copy这5个类
1.Base64
public class Base64 {
/**
* Chunk size per RFC 2045 section 6.8.
*
* <p>The {@value} character limit does not count the trailing CRLF, but counts
* all other characters, including any equal signs.</p>
*
* @see <a href="http://www.ietf.org/rfc/rfc2045.txt">RFC 2045 section 6.8</a>
*/
static final int CHUNK_SIZE = 76;
/**
* Chunk separator per RFC 2045 section 2.1.
*
* @see <a href="http://www.ietf.org/rfc/rfc2045.txt">RFC 2045 section 2.1</a>
*/
static final byte[] CHUNK_SEPARATOR = "\r\n".getBytes();
/**
* The base length.
*/
static final int BASELENGTH = 255;
/**
* Lookup length.
*/
static final int LOOKUPLENGTH = 64;
/**
* Used to calculate the number of bits in a byte.
*/
static final int EIGHTBIT = 8;
/**
* Used when encoding something which has fewer than 24 bits.
*/
static final int SIXTEENBIT = 16;
/**
* Used to determine how many bits data contains.
*/
static final int TWENTYFOURBITGROUP = 24;
/**
* Used to get the number of Quadruples.
*/
static final int FOURBYTE = 4;
/**
* Used to test the sign of a byte.
*/
static final int SIGN = -128;
/**
* Byte used to pad output.
*/
static final byte PAD = (byte) '=';
// Create arrays to hold the base64 characters and a
// lookup for base64 chars
private static byte[] base64Alphabet = new byte[BASELENGTH];
private static byte[] lookUpBase64Alphabet = new byte[LOOKUPLENGTH];
// Populating the lookup and character arrays
static {
for (int i = 0; i < BASELENGTH; i++) {
base64Alphabet[i] = (byte) -1;
}
for (int i = 'Z'; i >= 'A'; i--) {
base64Alphabet[i] = (byte) (i - 'A');
}
for (int i = 'z'; i >= 'a'; i--) {
base64Alphabet[i] = (byte) (i - 'a' + 26);
}
for (int i = '9'; i >= '0'; i--) {
base64Alphabet[i] = (byte) (i - '0' + 52);
}
base64Alphabet['+'] = 62;
base64Alphabet['/'] = 63;
for (int i = 0; i <= 25; i++) {
lookUpBase64Alphabet[i] = (byte) ('A' + i);
}
for (int i = 26, j = 0; i <= 51; i++, j++) {
lookUpBase64Alphabet[i] = (byte) ('a' + j);
}
for (int i = 52, j = 0; i <= 61; i++, j++) {
lookUpBase64Alphabet[i] = (byte) ('0' + j);
}
lookUpBase64Alphabet[62] = (byte) '+';
lookUpBase64Alphabet[63] = (byte) '/';
}
private static boolean isBase64(byte octect) {
if (octect == PAD) {
return true;
} else if (base64Alphabet[octect] == -1) {
return false;
} else {
return true;
}
}
/**
* Tests a given byte array to see if it contains
* only valid characters within the Base64 alphabet.
*
* @param arrayOctect byte array to test
* @return true if all bytes are valid characters in the Base64
* alphabet or if the byte array is empty; false, otherwise
*/
public static boolean isArrayByteBase64(byte[] arrayOctect) {
arrayOctect = discardWhitespace(arrayOctect);
int length = arrayOctect.length;
if (length == 0) {
// shouldn't a 0 length array be valid base64 data?
// return false;
return true;
}
for (int i = 0; i < length; i++) {
if (!isBase64(arrayOctect[i])) {
return false;
}
}
return true;
}
/**
* Encodes binary data using the base64 algorithm but
* does not chunk the output.
*
* @param binaryData binary data to encode
* @return Base64 characters
*/
public static byte[] encodeBase64(byte[] binaryData) {
return encodeBase64(binaryData, false);
}
/**
* Encodes binary data using the base64 algorithm and chunks
* the encoded output into 76 character blocks
*
* @param binaryData binary data to encode
* @return Base64 characters chunked in 76 character blocks
*/
public static byte[] encodeBase64Chunked(byte[] binaryData) {
return encodeBase64(binaryData, true);
}
/**
* Decodes a byte[] containing containing
* characters in the Base64 alphabet.
*
* @param pArray A byte array containing Base64 character data
* @return a byte array containing binary data
*/
public static byte[] decode(byte[] pArray) {
return decodeBase64(pArray);
}
/**
* Encodes binary data using the base64 algorithm, optionally
* chunking the output into 76 character blocks.
*
* @param binaryData Array containing binary data to encode.
* @param isChunked if isChunked is true this encoder will chunk
* the base64 output into 76 character blocks
* @return Base64-encoded data.
*/
public static byte[] encodeBase64(byte[] binaryData, boolean isChunked) {
int lengthDataBits = binaryData.length * EIGHTBIT;
int fewerThan24bits = lengthDataBits % TWENTYFOURBITGROUP;
int numberTriplets = lengthDataBits / TWENTYFOURBITGROUP;
byte encodedData[] = null;
int encodedDataLength = 0;
int nbrChunks = 0;
if (fewerThan24bits != 0) {
//data not divisible by 24 bit
encodedDataLength = (numberTriplets + 1) * 4;
} else {
// 16 or 8 bit
encodedDataLength = numberTriplets * 4;
}
// If the output is to be "chunked" into 76 character sections,
// for compliance with RFC 2045 MIME, then it is important to
// allow for extra length to account for the separator(s)
if (isChunked) {
nbrChunks =
(CHUNK_SEPARATOR.length == 0 ? 0 : (int) Math.ceil((float) encodedDataLength / CHUNK_SIZE));
encodedDataLength += nbrChunks * CHUNK_SEPARATOR.length;
}
encodedData = new byte[encodedDataLength];
byte k = 0, l = 0, b1 = 0, b2 = 0, b3 = 0;
int encodedIndex = 0;
int dataIndex = 0;
int i = 0;
int nextSeparatorIndex = CHUNK_SIZE;
int chunksSoFar = 0;
//log.debug("number of triplets = " + numberTriplets);
for (i = 0; i < numberTriplets; i++) {
dataIndex = i * 3;
b1 = binaryData[dataIndex];
b2 = binaryData[dataIndex + 1];
b3 = binaryData[dataIndex + 2];
//log.debug("b1= " + b1 +", b2= " + b2 + ", b3= " + b3);
l = (byte) (b2 & 0x0f);
k = (byte) (b1 & 0x03);
byte val1 =
((b1 & SIGN) == 0) ? (byte) (b1 >> 2) : (byte) ((b1) >> 2 ^ 0xc0);
byte val2 =
((b2 & SIGN) == 0) ? (byte) (b2 >> 4) : (byte) ((b2) >> 4 ^ 0xf0);
byte val3 =
((b3 & SIGN) == 0) ? (byte) (b3 >> 6) : (byte) ((b3) >> 6 ^ 0xfc);
encodedData[encodedIndex] = lookUpBase64Alphabet[val1];
//log.debug( "val2 = " + val2 );
//log.debug( "k4 = " + (k<<4) );
//log.debug( "vak = " + (val2 | (k<<4)) );
encodedData[encodedIndex + 1] =
lookUpBase64Alphabet[val2 | (k << 4)];
encodedData[encodedIndex + 2] =
lookUpBase64Alphabet[(l << 2) | val3];
encodedData[encodedIndex + 3] = lookUpBase64Alphabet[b3 & 0x3f];
encodedIndex += 4;
// If we are chunking, let's put a chunk separator down.
if (isChunked) {
// this assumes that CHUNK_SIZE % 4 == 0
if (encodedIndex == nextSeparatorIndex) {
System.arraycopy(
CHUNK_SEPARATOR,
0,
encodedData,
encodedIndex,
CHUNK_SEPARATOR.length);
chunksSoFar++;
nextSeparatorIndex =
(CHUNK_SIZE * (chunksSoFar + 1)) +
(chunksSoFar * CHUNK_SEPARATOR.length);
encodedIndex += CHUNK_SEPARATOR.length;
}
}
}
// form integral number of 6-bit groups
dataIndex = i * 3;
if (fewerThan24bits == EIGHTBIT) {
b1 = binaryData[dataIndex];
k = (byte) (b1 & 0x03);
//log.debug("b1=" + b1);
//log.debug("b1<<2 = " + (b1>>2) );
byte val1 =
((b1 & SIGN) == 0) ? (byte) (b1 >> 2) : (byte) ((b1) >> 2 ^ 0xc0);
encodedData[encodedIndex] = lookUpBase64Alphabet[val1];
encodedData[encodedIndex + 1] = lookUpBase64Alphabet[k << 4];
encodedData[encodedIndex + 2] = PAD;
encodedData[encodedIndex + 3] = PAD;
} else if (fewerThan24bits == SIXTEENBIT) {
b1 = binaryData[dataIndex];
b2 = binaryData[dataIndex + 1];
l = (byte) (b2 & 0x0f);
k = (byte) (b1 & 0x03);
byte val1 =
((b1 & SIGN) == 0) ? (byte) (b1 >> 2) : (byte) ((b1) >> 2 ^ 0xc0);
byte val2 =
((b2 & SIGN) == 0) ? (byte) (b2 >> 4) : (byte) ((b2) >> 4 ^ 0xf0);
encodedData[encodedIndex] = lookUpBase64Alphabet[val1];
encodedData[encodedIndex + 1] =
lookUpBase64Alphabet[val2 | (k << 4)];
encodedData[encodedIndex + 2] = lookUpBase64Alphabet[l << 2];
encodedData[encodedIndex + 3] = PAD;
}
if (isChunked) {
// we also add a separator to the end of the final chunk.
if (chunksSoFar < nbrChunks) {
System.arraycopy(
CHUNK_SEPARATOR,
0,
encodedData,
encodedDataLength - CHUNK_SEPARATOR.length,
CHUNK_SEPARATOR.length);
}
}
return encodedData;
}
/**
* Decodes Base64 data into octects
*
* @param base64Data Byte array containing Base64 data
* @return Array containing decoded data.
*/
public static byte[] decodeBase64(byte[] base64Data) {
// RFC 2045 requires that we discard ALL non-Base64 characters
base64Data = discardNonBase64(base64Data);
// handle the edge case, so we don't have to worry about it later
if (base64Data.length == 0) {
return new byte[0];
}
int numberQuadruple = base64Data.length / FOURBYTE;
byte decodedData[] = null;
byte b1 = 0, b2 = 0, b3 = 0, b4 = 0, marker0 = 0, marker1 = 0;
// Throw away anything not in base64Data
int encodedIndex = 0;
int dataIndex = 0;
{
// this sizes the output array properly - rlw
int lastData = base64Data.length;
// ignore the '=' padding
while (base64Data[lastData - 1] == PAD) {
if (--lastData == 0) {
return new byte[0];
}
}
decodedData = new byte[lastData - numberQuadruple];
}
for (int i = 0; i < numberQuadruple; i++) {
dataIndex = i * 4;
marker0 = base64Data[dataIndex + 2];
marker1 = base64Data[dataIndex + 3];
b1 = base64Alphabet[base64Data[dataIndex]];
b2 = base64Alphabet[base64Data[dataIndex + 1]];
if (marker0 != PAD && marker1 != PAD) {
//No PAD e.g 3cQl
b3 = base64Alphabet[marker0];
b4 = base64Alphabet[marker1];
decodedData[encodedIndex] = (byte) (b1 << 2 | b2 >> 4);
decodedData[encodedIndex + 1] =
(byte) (((b2 & 0xf) << 4) | ((b3 >> 2) & 0xf));
decodedData[encodedIndex + 2] = (byte) (b3 << 6 | b4);
} else if (marker0 == PAD) {
//Two PAD e.g. 3c[Pad][Pad]
decodedData[encodedIndex] = (byte) (b1 << 2 | b2 >> 4);
} else if (marker1 == PAD) {
//One PAD e.g. 3cQ[Pad]
b3 = base64Alphabet[marker0];
decodedData[encodedIndex] = (byte) (b1 << 2 | b2 >> 4);
decodedData[encodedIndex + 1] =
(byte) (((b2 & 0xf) << 4) | ((b3 >> 2) & 0xf));
}
encodedIndex += 3;
}
return decodedData;
}
/**
* Discards any whitespace from a base-64 encoded block.
*
* @param data The base-64 encoded data to discard the whitespace
* from.
* @return The data, less whitespace (see RFC 2045).
*/
static byte[] discardWhitespace(byte[] data) {
byte groomedData[] = new byte[data.length];
int bytesCopied = 0;
for (int i = 0; i < data.length; i++) {
switch (data[i]) {
case (byte) ' ' :
case (byte) '\n' :
case (byte) '\r' :
case (byte) '\t' :
break;
default:
groomedData[bytesCopied++] = data[i];
}
}
byte packedData[] = new byte[bytesCopied];
System.arraycopy(groomedData, 0, packedData, 0, bytesCopied);
return packedData;
}
/**
* Discards any characters outside of the base64 alphabet, per
* the requirements on page 25 of RFC 2045 - "Any characters
* outside of the base64 alphabet are to be ignored in base64
* encoded data."
*
* @param data The base-64 encoded data to groom
* @return The data, less non-base64 characters (see RFC 2045).
*/
static byte[] discardNonBase64(byte[] data) {
byte groomedData[] = new byte[data.length];
int bytesCopied = 0;
for (int i = 0; i < data.length; i++) {
if (isBase64(data[i])) {
groomedData[bytesCopied++] = data[i];
}
}
byte packedData[] = new byte[bytesCopied];
System.arraycopy(groomedData, 0, packedData, 0, bytesCopied);
return packedData;
}
/**
* Encodes a byte[] containing binary data, into a byte[] containing
* characters in the Base64 alphabet.
*
* @param pArray a byte array containing binary data
* @return A byte array containing only Base64 character data
*/
public static byte[] encode(byte[] pArray) {
return encodeBase64(pArray, false);
}
public static String encode(String str) throws UnsupportedEncodingException
{
String baseStr = new String(encode(str.getBytes("UTF-8")));
String tempStr = Digest.digest(str).toUpperCase();
String result = tempStr+baseStr;
return new String(encode(result.getBytes("UTF-8")));
}
public static String decode(String cryptoStr) throws
UnsupportedEncodingException {
if(cryptoStr.length()<40)
return "";
try
{
String tempStr = new String(decode(cryptoStr.getBytes("UTF-8")));
String result = tempStr.substring(40, tempStr.length());
return new String(decode(result.getBytes("UTF-8")));
}
catch(ArrayIndexOutOfBoundsException ex)
{
return "";
}
}
/**
* Decodes Base64 data into octects
*
* @param encoded string containing Base64 data
* @return Array containind decoded data.
*/
public static byte[] decode2(String encoded) {
if (encoded == null) {
return null;
}
char[] base64Data = encoded.toCharArray();
// remove white spaces
int len = removeWhiteSpace(base64Data);
if (len % FOURBYTE != 0) {
return null;//should be divisible by four
}
int numberQuadruple = (len / FOURBYTE);
if (numberQuadruple == 0) {
return new byte[0];
}
byte decodedData[] = null;
byte b1 = 0, b2 = 0, b3 = 0, b4 = 0;
char d1 = 0, d2 = 0, d3 = 0, d4 = 0;
int i = 0;
int encodedIndex = 0;
int dataIndex = 0;
decodedData = new byte[(numberQuadruple) * 3];
for (; i < numberQuadruple - 1; i++) {
if (!isData((d1 = base64Data[dataIndex++])) || !isData((d2 = base64Data[dataIndex++]))
|| !isData((d3 = base64Data[dataIndex++]))
|| !isData((d4 = base64Data[dataIndex++]))) {
return null;
}//if found "no data" just return null
b1 = base64Alphabet[d1];
b2 = base64Alphabet[d2];
b3 = base64Alphabet[d3];
b4 = base64Alphabet[d4];
decodedData[encodedIndex++] = (byte) (b1 << 2 | b2 >> 4);
decodedData[encodedIndex++] = (byte) (((b2 & 0xf) << 4) | ((b3 >> 2) & 0xf));
decodedData[encodedIndex++] = (byte) (b3 << 6 | b4);
}
if (!isData((d1 = base64Data[dataIndex++])) || !isData((d2 = base64Data[dataIndex++]))) {
return null;//if found "no data" just return null
}
b1 = base64Alphabet[d1];
b2 = base64Alphabet[d2];
d3 = base64Data[dataIndex++];
d4 = base64Data[dataIndex++];
if (!isData((d3)) || !isData((d4))) {//Check if they are PAD characters
if (isPad(d3) && isPad(d4)) {
if ((b2 & 0xf) != 0)//last 4 bits should be zero
{
return null;
}
byte[] tmp = new byte[i * 3 + 1];
System.arraycopy(decodedData, 0, tmp, 0, i * 3);
tmp[encodedIndex] = (byte) (b1 << 2 | b2 >> 4);
return tmp;
} else if (!isPad(d3) && isPad(d4)) {
b3 = base64Alphabet[d3];
if ((b3 & 0x3) != 0)//last 2 bits should be zero
{
return null;
}
byte[] tmp = new byte[i * 3 + 2];
System.arraycopy(decodedData, 0, tmp, 0, i * 3);
tmp[encodedIndex++] = (byte) (b1 << 2 | b2 >> 4);
tmp[encodedIndex] = (byte) (((b2 & 0xf) << 4) | ((b3 >> 2) & 0xf));
return tmp;
} else {
return null;
}
} else { //No PAD e.g 3cQl
b3 = base64Alphabet[d3];
b4 = base64Alphabet[d4];
decodedData[encodedIndex++] = (byte) (b1 << 2 | b2 >> 4);
decodedData[encodedIndex++] = (byte) (((b2 & 0xf) << 4) | ((b3 >> 2) & 0xf));
decodedData[encodedIndex++] = (byte) (b3 << 6 | b4);
}
return decodedData;
}
private static boolean isWhiteSpace(char octect) {
return (octect == 0x20 || octect == 0xd || octect == 0xa || octect == 0x9);
}
private static boolean isData(char octect) {
return (octect < BASELENGTH && base64Alphabet[octect] != -1);
}
private static boolean isPad(char octect) {
return (octect == PAD);
}
/**
* remove WhiteSpace from MIME containing encoded Base64 data.
*
* @param data the byte array of base64 data (with WS)
* @return the new length
*/
private static int removeWhiteSpace(char[] data) {
if (data == null) {
return 0;
}
// count characters that's not whitespace
int newSize = 0;
int len = data.length;
for (int i = 0; i < len; i++) {
if (!isWhiteSpace(data[i])) {
data[newSize++] = data[i];
}
}
return newSize;
}
}2.ConfigureEncryptAndDecrypt
public class ConfigureEncryptAndDecrypt {
public static final String CHAR_ENCODING = "UTF-8";
public static final String AES_ALGORITHM = "AES/CBC/PKCS5Padding";
public static final String RSA_ALGORITHM = "RSA/ECB/PKCS1Padding";
}3.ConvertUtils
public class ConvertUtils {
private static final DecimalFormat simpleFormat = new DecimalFormat("####");
public static final boolean objectToBoolean(Object o){
return o != null ? Boolean.valueOf(o.toString()).booleanValue() : false;
}
public static final int objectToInt(Object o){
if(o instanceof Number)
return ((Number)o).intValue();
try{
if(o == null)
return -1;
else
return Integer.parseInt(o.toString());
}catch(NumberFormatException e){
return -1;
}
}
public static final short objectToShort(Object o){
if(o instanceof Number)
return ((Number)o).shortValue();
try{
if(o == null)
return -1;
else
return Short.parseShort(o.toString());
}catch(NumberFormatException e){
return -1;
}
}
public static final double objectToDouble(Object o){
if(o instanceof Number)
return ((Number)o).doubleValue();
try{
if(o == null)
return -1D;
else
return Double.parseDouble(o.toString());
}catch(NumberFormatException e){
return -1D;
}
}
public static final long objectToLong(Object o)
{
if(o instanceof Number)
return ((Number)o).longValue();
try{
if(o == null)
return -1L;
else
return Long.parseLong(o.toString());
}catch(NumberFormatException e){
return -1L;
}
}
public static final String objectToString(Object obj, DecimalFormat fmt)
{
fmt.setDecimalSeparatorAlwaysShown(false);
if(obj instanceof Double)
return fmt.format(((Double)obj).doubleValue());
if(obj instanceof Long)
return fmt.format(((Long)obj).longValue());
else
return obj.toString();
}
public static final Object getObjectValue(String value)
{
try{
return Long.valueOf(value);
}catch(NumberFormatException e) {}
try{
return Double.valueOf(value);
}catch(NumberFormatException e){
return value;
}
}
public static String longToSimpleString(long value){
return simpleFormat.format(value);
}
public static String asHex(byte hash[]){
return toHex(hash);
}
public static String toHex(byte input[]){
if(input == null)
return null;
StringBuffer output = new StringBuffer(input.length * 2);
for(int i = 0; i < input.length; i++){
int current = input[i] & 0xff;
if(current < 16)
output.append("0");
output.append(Integer.toString(current, 16));
}
return output.toString();
}
public static byte[] fromHex(String input){
if(input == null)
return null;
byte output[] = new byte[input.length() / 2];
for(int i = 0; i < output.length; i++)
output[i] = (byte)Integer.parseInt(input.substring(i * 2, (i + 1) * 2), 16);
return output;
}
public static String stringToHexString(String input, String encoding)
throws UnsupportedEncodingException {
return input != null ? toHex(input.getBytes(encoding)) : null;
}
public static String stringToHexString(String input){
try{
return stringToHexString(input, "UTF-8");
}catch(UnsupportedEncodingException e){
throw new IllegalStateException("UTF-8 encoding is not supported by JVM");
}
}
public static String hexStringToString(String input, String encoding)
throws UnsupportedEncodingException{
return input != null ? new String(fromHex(input), encoding) : null;
}
public static String hexStringToString(String input){
try{
return hexStringToString(input, "UTF-8");
}catch(UnsupportedEncodingException e){
throw new IllegalStateException("UTF-8 encoding is not supported by JVM");
}
}
public static String timeZoneToCode(TimeZone tz){
return timeZoneToString(tz);
}
public static TimeZone codeToTimeZone(String tzString){
return stringToTimeZone(tzString);
}
public static String timeZoneToString(TimeZone tz){
return tz != null ? tz.getID() : "";
}
public static TimeZone stringToTimeZone(String tzString){
return TimeZone.getTimeZone(tzString != null ? tzString : "");
}
public static String localeToCode(Locale aLocale){
return localeToString(aLocale);
}
public static Locale codeToLocale(String locString){
return stringToLocale(locString);
}
public static String localeToString(Locale loc){
return loc != null ? loc.toString() : "";
}
public static Locale stringToLocale(String locString){
locString = locString != null ? locString.trim() : "";
if(locString.equals(""))
return new Locale("", "", "");
int pos = locString.indexOf(95);
if(pos == -1)
return new Locale(locString, "", "");
String language = locString.substring(0, pos);
locString = locString.substring(pos + 1);
pos = locString.indexOf(95);
if(pos == -1){
return new Locale(language, locString, "");
}else{
String country = locString.substring(0, pos);
locString = locString.substring(pos + 1);
return new Locale(language, country, locString);
}
}
public static Date dateToSQLDate(java.util.Date d){
return d != null ? new Date(d.getTime()) : null;
}
public static Time dateToSQLTime(java.util.Date d){
return d != null ? new Time(d.getTime()) : null;
}
public static Timestamp dateToSQLTimestamp(java.util.Date d){
return d != null ? new Timestamp(d.getTime()) : null;
}
public static java.util.Date sqlTimestampToDate(Timestamp t){
return t != null ? new java.util.Date(Math.round((double)t.getTime() + (double)t.getNanos() / 1000000D)) : null;
}
public static Timestamp getCurrentDate(){
Calendar c = Calendar.getInstance();
c.set(c.get(1), c.get(2), c.get(5), 0, 0, 0);
Timestamp t = new Timestamp(c.getTime().getTime());
t.setNanos(0);
return t;
}
public static java.util.Date getDate(int y, int m, int d, boolean inclusive)
{
java.util.Date dt = null;
Calendar c = Calendar.getInstance();
c.clear();
if(c.getActualMinimum(1) <= y && y <= c.getActualMaximum(1))
{
c.set(1, y);
if(c.getActualMinimum(2) <= m && m <= c.getActualMaximum(2))
{
c.set(2, m);
if(c.getActualMinimum(5) <= d && d <= c.getActualMaximum(5))
c.set(5, d);
}
if(inclusive)
{
c.add(5, 1);
c.add(14, -1);
}
dt = c.getTime();
}
return dt;
}
public static java.util.Date getDateStart(java.util.Date d)
{
Calendar c = new GregorianCalendar();
c.clear();
Calendar co = new GregorianCalendar();
co.setTime(d);
c.set(Calendar.DAY_OF_MONTH,co.get(Calendar.DAY_OF_MONTH));
c.set(Calendar.MONTH,co.get(Calendar.MONTH));
c.set(Calendar.YEAR,co.get(Calendar.YEAR));
//c.add(Calendar.DAY_OF_MONTH,1);
//c.add(Calendar.MILLISECOND,-1);
return c.getTime();
}
public static java.util.Date getDateEnd(java.util.Date d)
{
Calendar c = Calendar.getInstance();
c.clear();
Calendar co = Calendar.getInstance();
co.setTime(d);
c.set(Calendar.DAY_OF_MONTH,co.get(Calendar.DAY_OF_MONTH));
c.set(Calendar.MONTH,co.get(Calendar.MONTH));
c.set(Calendar.YEAR,co.get(Calendar.YEAR));
c.add(Calendar.DAY_OF_MONTH,1);
c.add(Calendar.MILLISECOND,-1);
return c.getTime();
}
public static double roundNumber(double rowNumber, int roundingPoint)
{
double base = Math.pow(10D, roundingPoint);
return (double)Math.round(rowNumber * base) / base;
}
public static Object getObject(String type,String value) throws Exception{
type=type.toLowerCase();
if("boolean".equals(type))
return Boolean.valueOf(value);
if("byte".equals(type))
return Byte.valueOf(value);
if("short".equals(type))
return Short.valueOf(value);
if("char".equals(type))
if(value.length() != 1)
throw new NumberFormatException("Argument is not a character!");
else
return Character.valueOf(value.toCharArray()[0]);
if("int".equals(type))
return Integer.valueOf(value);
if("long".equals(type))
return Long.valueOf(value);
if("float".equals(type))
return Float.valueOf(value);
if("double".equals(type))
return Double.valueOf(value);
if("string".equals(type))
return value;
else{
Object objs[]=new String[]{value};
return Class.forName(type).getConstructor(new Class[] {
String.class
}).newInstance(objs);
}
}
private ConvertUtils(){}
// public static void main(String[] args)
// {
// System.out.println(getDateStart(new java.util.Date()));
// }
}4.Digest
public class Digest {
public static final String ENCODE = "UTF-8";
public static String signMD5(String aValue, String encoding) {
try {
byte[] input = aValue.getBytes(encoding);
MessageDigest md = MessageDigest.getInstance("MD5");
return ConvertUtils.toHex(md.digest(input));
} catch (NoSuchAlgorithmException e) {
LogUtil.print(e);
return null;
} catch (UnsupportedEncodingException e) {
LogUtil.print(e);
return null;
}
}
public static String hmacSign(String aValue) {
try {
byte[] input = aValue.getBytes();
MessageDigest md = MessageDigest.getInstance("MD5");
return ConvertUtils.toHex(md.digest(input));
} catch (NoSuchAlgorithmException e) {
LogUtil.print(e);
return null;
}
}
public static String hmacSign(String aValue, String aKey) {
return hmacSign(aValue, aKey, ENCODE);
}
public static String hmacSign(String aValue, String aKey, String encoding) {
byte k_ipad[] = new byte[64];
byte k_opad[] = new byte[64];
byte keyb[];
byte value[];
try {
keyb = aKey.getBytes(encoding);
value = aValue.getBytes(encoding);
} catch (UnsupportedEncodingException e) {
keyb = aKey.getBytes();
value = aValue.getBytes();
}
Arrays.fill(k_ipad, keyb.length, 64, (byte) 54);
Arrays.fill(k_opad, keyb.length, 64, (byte) 92);
for (int i = 0; i < keyb.length; i++) {
k_ipad[i] = (byte) (keyb[i] ^ 0x36);
k_opad[i] = (byte) (keyb[i] ^ 0x5c);
}
MessageDigest md = null;
try {
md = MessageDigest.getInstance("MD5");
} catch (NoSuchAlgorithmException e) {
LogUtil.print(e);
return null;
}
md.update(k_ipad);
md.update(value);
byte dg[] = md.digest();
md.reset();
md.update(k_opad);
md.update(dg, 0, 16);
dg = md.digest();
return ConvertUtils.toHex(dg);
}
public static String hmacSHASign(String aValue, String aKey, String encoding) {
byte k_ipad[] = new byte[64];
byte k_opad[] = new byte[64];
byte keyb[];
byte value[];
try {
keyb = aKey.getBytes(encoding);
value = aValue.getBytes(encoding);
} catch (UnsupportedEncodingException e) {
keyb = aKey.getBytes();
value = aValue.getBytes();
}
Arrays.fill(k_ipad, keyb.length, 64, (byte) 54);
Arrays.fill(k_opad, keyb.length, 64, (byte) 92);
for (int i = 0; i < keyb.length; i++) {
k_ipad[i] = (byte) (keyb[i] ^ 0x36);
k_opad[i] = (byte) (keyb[i] ^ 0x5c);
}
MessageDigest md = null;
try {
md = MessageDigest.getInstance("SHA");
} catch (NoSuchAlgorithmException e) {
LogUtil.print(e);
return null;
}
md.update(k_ipad);
md.update(value);
byte dg[] = md.digest();
md.reset();
md.update(k_opad);
md.update(dg, 0, 20);
dg = md.digest();
return ConvertUtils.toHex(dg);
}
public static String digest(String aValue) {
return digest(aValue, ENCODE);
}
public static String digest(String aValue, String encoding) {
aValue = aValue.trim();
byte value[];
try {
value = aValue.getBytes(encoding);
} catch (UnsupportedEncodingException e) {
value = aValue.getBytes();
}
MessageDigest md = null;
try {
md = MessageDigest.getInstance("SHA");
} catch (NoSuchAlgorithmException e) {
return null;
}
return ConvertUtils.toHex(md.digest(value));
}
public static String digest(String aValue, String alg, String encoding) {
aValue = aValue.trim();
byte value[];
try {
value = aValue.getBytes(encoding);
} catch (UnsupportedEncodingException e) {
value = aValue.getBytes();
}
MessageDigest md = null;
try {
md = MessageDigest.getInstance(alg);
} catch (NoSuchAlgorithmException e) {
return null;
}
return ConvertUtils.toHex(md.digest(value));
}
public static String udpSign(String aValue) {
try {
byte[] input = aValue.getBytes("UTF-8");
MessageDigest md = MessageDigest.getInstance("SHA1");
return new String(Base64.encode(md.digest(input)), ENCODE);
} catch (Exception e) {
return null;
}
}
}5.RSA
public class RSA {
public static String PUBLICKEY = "";//你的publicbey
public static String PRIVATEKEY = "";//你的privatekey
/**
* 指定key的大小
*/
private static int KEYSIZE = 2048;
/**
* 生成密钥对
*/
public static Map<String, String> generateKeyPair() throws Exception {
/** RSA算法要求有一个可信任的随机数源 */
SecureRandom sr = new SecureRandom();
/** 为RSA算法创建一个KeyPairGenerator对象 */
KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");
/** 利用上面的随机数据源初始化这个KeyPairGenerator对象 */
kpg.initialize(KEYSIZE, sr);
/** 生成密匙对 */
KeyPair kp = kpg.generateKeyPair();
/** 得到公钥 */
Key publicKey = kp.getPublic();
byte[] publicKeyBytes = publicKey.getEncoded();
String pub = new String(Base64.encodeBase64(publicKeyBytes),
ConfigureEncryptAndDecrypt.CHAR_ENCODING);
/** 得到私钥 */
Key privateKey = kp.getPrivate();
byte[] privateKeyBytes = privateKey.getEncoded();
String pri = new String(Base64.encodeBase64(privateKeyBytes),
ConfigureEncryptAndDecrypt.CHAR_ENCODING);
Map<String, String> map = new HashMap<String, String>();
map.put("publicKey", pub);
map.put("privateKey", pri);
RSAPublicKey rsp = (RSAPublicKey) kp.getPublic();
BigInteger bint = rsp.getModulus();
byte[] b = bint.toByteArray();
byte[] deBase64Value = Base64.encodeBase64(b);
String retValue = new String(deBase64Value);
map.put("modulus", retValue);
return map;
}
/**
* 加密方法 source： 源数据
*/
public static String encrypt(String source, String publicKey)
throws Exception {
Key key = getPublicKey(publicKey);
/** 得到Cipher对象来实现对源数据的RSA加密 */
Cipher cipher = Cipher.getInstance(ConfigureEncryptAndDecrypt.RSA_ALGORITHM);
cipher.init(Cipher.ENCRYPT_MODE, key);
byte[] b = source.getBytes();
/** 执行加密操作 */
byte[] b1 = cipher.doFinal(b);
return new String(Base64.encodeBase64(b1),
ConfigureEncryptAndDecrypt.CHAR_ENCODING);
}
/**
* 解密算法 cryptograph:密文
*/
public static String decrypt(String cryptograph, String privateKey)
throws Exception {
Key key = getPrivateKey(privateKey);
/** 得到Cipher对象对已用公钥加密的数据进行RSA解密 */
Cipher cipher = Cipher.getInstance(ConfigureEncryptAndDecrypt.RSA_ALGORITHM);
cipher.init(Cipher.DECRYPT_MODE, key);
byte[] b1 = Base64.decodeBase64(cryptograph.getBytes());
/** 执行解密操作 */
byte[] b = cipher.doFinal(b1);
return new String(b);
}
/**
* 得到公钥
*
* @param key 密钥字符串（经过base64编码）
* @throws Exception
*/
public static PublicKey getPublicKey(String key) throws Exception {
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(
Base64.decodeBase64(key.getBytes()));
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
PublicKey publicKey = keyFactory.generatePublic(keySpec);
return publicKey;
}
/**
* 得到私钥
*
* @param key 密钥字符串（经过base64编码）
* @throws Exception
*/
public static PrivateKey getPrivateKey(String key) throws Exception {
PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(
Base64.decodeBase64(key.getBytes()));
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
PrivateKey privateKey = keyFactory.generatePrivate(keySpec);
return privateKey;
}
public static String sign(String content, String privateKey) {
String charset = ConfigureEncryptAndDecrypt.CHAR_ENCODING;
try {
PKCS8EncodedKeySpec priPKCS8 = new PKCS8EncodedKeySpec(
Base64.decodeBase64(privateKey.getBytes()));
KeyFactory keyf = KeyFactory.getInstance("RSA");
PrivateKey priKey = keyf.generatePrivate(priPKCS8);
Signature signature = Signature.getInstance("SHA256WithRSA");
signature.initSign(priKey);
signature.update(content.getBytes(charset));
byte[] signed = signature.sign();
return new String(Base64.encodeBase64(signed));
} catch (Exception e) {
}
return null;
}
public static boolean checkSign(String content, String sign, String publicKey) {
try {
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
byte[] encodedKey = Base64.decode2(publicKey);
PublicKey pubKey = keyFactory.generatePublic(new X509EncodedKeySpec(encodedKey));
Signature signature = Signature
.getInstance("SHA256WithRSA");
signature.initVerify(pubKey);
signature.update(content.getBytes("utf-8"));
boolean bverify = signature.verify(Base64.decode2(sign));
return bverify;
} catch (Exception e) {
LogUtil.print(e);
}
return false;
}
}用法：
//加密
String aesStr = tv_8.getText().toString();
aesStr = RSA.encrypt(aesStr.substring(11, aesStr.length()), RSA.PUBLICKEY);
//解密
String jieMiStr = RSA.decrypt(aesStr, RSA.PRIVATEKEY);
//加密
具体怎么解决的就不用管了直接用就好了，爆赞
leileitua
