AES 256 位 加密
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2024-03-16 18:41:40
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public class AES256Utils {
public AES256Utils() throws Exception {
}
// 加密
public static String Encrypt(String sSrc, String sKey) throws Exception {
if (sKey == null) {
System.out.print("Key为空null");
return null;
}
// 判断Key是否为16位
if (sKey.length() != 16) {
System.out.print("Key长度不是16位");
return null;
}
byte[] raw = sKey.getBytes();
SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");// "算法/模式/补码方式"
IvParameterSpec iv = new IvParameterSpec("0102030405060708".getBytes());// 使用CBC模式，需要一个向量iv，可增加加密算法的强度
cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
byte[] encrypted = cipher.doFinal(sSrc.getBytes());
return Base64Encoder.encode(encrypted);// 此处使用BASE64做转码功能，同时能起到2次加密的作用。
}
// 解密
public static String Decrypt(String sSrc, String sKey) throws Exception {
try {
// 判断Key是否正确
if (sKey == null) {
System.out.print("Key为空null");
return null;
}
// 判断Key是否为16位
if (sKey.length() != 16) {
System.out.print("Key长度不是16位");
return null;
}
byte[] raw = sKey.getBytes("UTF-8");
SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
IvParameterSpec iv = new IvParameterSpec(
"0102030405060708".getBytes());
cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
byte[] encrypted1 = Base64Decoder.decodeToBytes(sSrc);// Base64Decoder.decode(sSrc);//先用base64解密
try {
byte[] original = cipher.doFinal(encrypted1);
String originalString = new String(original);
return originalString;
} catch (Exception e) {
System.out.println(e.toString());
return null;
}
} catch (Exception ex) {
System.out.println(ex.toString());
return null;
}
}
public static void main(String[] args) throws Exception {
/*
* 加密用的Key 可以用26个字母和数字组成，最好不要用保留字符，虽然不会错，至于怎么裁决，个人看情况而定
* 此处使用AES-128-CBC加密模式，key需要为16位。
*/
String cKey = "world12312312312";
// 需要加密的字串
String cSrc = "{'amt':'" + "0.01" + "'},{'traceNo':'" + "000415" + "'}";
System.out.println(cSrc); // 加密
String enString = Encrypt(cSrc, cKey);
System.out.println("加密" + enString);
String DeString = Decrypt(enString, cKey);
System.out.println("解密" + DeString);
/*
String cKey = "world12312312312";
String cSrc = "18511829819";
String enString = AES256Utils.Encrypt(cSrc, cKey);
System.out.println("加密后：" + enString);
String cnString = AES256Utils.Decrypt(enString, cKey);
System.out.println("解密后：" + cnString);
*/
}
}这里还缺少两个Base64解密和加密的类
/**
* tang
*Base64转码的工具类处理----解码
*/
public class Base64Decoder extends FilterInputStream {
private static final char[] chars = {
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J',
'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T',
'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd',
'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x',
'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7',
'8', '9', '+', '/'
};
// A mapping between char values and six-bit integers
private static final int[] ints = new int[128];
static {
for (int i = 0; i < 64; i++) {
ints[chars[i]] = i;
}
}
private int charCount;
private int carryOver;
/***
* Constructs a new Base64 decoder that reads input from the given
* InputStream.
*
* @param in the input stream
*/
public Base64Decoder(InputStream in) {
super(in);
}
/***
* Returns the next decoded character from the stream, or -1 if
* end of stream was reached.
*
* @return the decoded character, or -1 if the end of the
* input stream is reached
* @exception IOException if an I/O error occurs
*/
public int read() throws IOException {
// Read the next non-whitespace character
int x;
do {
x = in.read();
if (x == -1) {
return -1;
}
} while (Character.isWhitespace((char)x));
charCount++;
// The '=' sign is just padding
if (x == '=') {
return -1; // effective end of stream
}
// Convert from raw form to 6-bit form
x = ints[x];
// Calculate which character we're decoding now
int mode = (charCount - 1) % 4;
// First char save all six bits, go for another
if (mode == 0) {
carryOver = x & 63;
return read();
}
// Second char use previous six bits and first two new bits,
// save last four bits
else if (mode == 1) {
int decoded = ((carryOver << 2) + (x >> 4)) & 255;
carryOver = x & 15;
return decoded;
}
// Third char use previous four bits and first four new bits,
// save last two bits
else if (mode == 2) {
int decoded = ((carryOver << 4) + (x >> 2)) & 255;
carryOver = x & 3;
return decoded;
}
// Fourth char use previous two bits and all six new bits
else if (mode == 3) {
int decoded = ((carryOver << 6) + x) & 255;
return decoded;
}
return -1; // can't actually reach this line
}
/***
* Reads decoded data into an array of bytes and returns the actual
* number of bytes read, or -1 if end of stream was reached.
*
* @param buf the buffer into which the data is read
* @param off the start offset of the data
* @param len the maximum number of bytes to read
* @return the actual number of bytes read, or -1 if the end of the
* input stream is reached
* @exception IOException if an I/O error occurs
*/
public int read(byte[] buf, int off, int len) throws IOException {
if (buf.length < (len + off - 1)) {
throw new IOException("The input buffer is too small: " + len +
" bytes requested starting at offset " + off + " while the buffer " +
" is only " + buf.length + " bytes long.");
}
// This could of course be optimized
int i;
for (i = 0; i < len; i++) {
int x = read();
if (x == -1 && i == 0) { // an immediate -1 returns -1
return -1;
}
else if (x == -1) { // a later -1 returns the chars read so far
break;
}
buf[off + i] = (byte) x;
}
return i;
}
/***
* Returns the decoded form of the given encoded string, as a String.
* Note that not all binary data can be represented as a String, so this
* method should only be used for encoded String data. Use decodeToBytes()
* otherwise.
*
* @param encoded the string to decode
* @return the decoded form of the encoded string
*/
public static String decode(String encoded) {
return new String(decodeToBytes(encoded));
}
/***
* Returns the decoded form of the given encoded string, as bytes.
*
* @param encoded the string to decode
* @return the decoded form of the encoded string
*/
public static byte[] decodeToBytes(String encoded) {
byte[] bytes = null;
try {
bytes = encoded.getBytes("UTF-8");
}
catch (UnsupportedEncodingException ignored) { }
Base64Decoder in = new Base64Decoder(
new ByteArrayInputStream(bytes));
ByteArrayOutputStream out =
new ByteArrayOutputStream((int) (bytes.length * 0.67));
try {
byte[] buf = new byte[4 * 1024]; // 4K buffer
int bytesRead;
while ((bytesRead = in.read(buf)) != -1) {
out.write(buf, 0, bytesRead);
}
out.close();
return out.toByteArray();
}
catch (IOException ignored) { return null; }
}
public static void main(String[] args) throws Exception {
if (args.length != 1) {
System.err.println("Usage: java Base64Decoder fileToDecode");
return;
}
Base64Decoder decoder = null;
try {
decoder = new Base64Decoder(
new BufferedInputStream(
new FileInputStream(args[0])));
byte[] buf = new byte[4 * 1024]; // 4K buffer
int bytesRead;
while ((bytesRead = decoder.read(buf)) != -1) {
// System.out.write(buf, 0, bytesRead);
}
}
finally {
if (decoder != null) decoder.close();
}
}
}
/**
*Base64转码的工具类处理----转码
*/
public class Base64Encoder extends FilterOutputStream {
private static final char[] chars = {
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J',
'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T',
'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd',
'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x',
'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7',
'8', '9', '+', '/'
};
private int charCount;
private int carryOver;
/***
* Constructs a new Base64 encoder that writes output to the given
* OutputStream.
*
* @param out the output stream
*/
public Base64Encoder(OutputStream out) {
super(out);
}
/***
* Writes the given byte to the output stream in an encoded form.
*
* @exception IOException if an I/O error occurs
*/
public void write(int b) throws IOException {
if (b < 0) {
b += 256;
}
if (charCount % 3 == 0) {
int lookup = b >> 2;
carryOver = b & 3; // last two bits
out.write(chars[lookup]);
}
// Second byte use previous two bits and first four new bits,
// save last four bits
else if (charCount % 3 == 1) {
int lookup = ((carryOver << 4) + (b >> 4)) & 63;
carryOver = b & 15; // last four bits
out.write(chars[lookup]);
}
// Third byte use previous four bits and first two new bits,
// then use last six new bits
else if (charCount % 3 == 2) {
int lookup = ((carryOver << 2) + (b >> 6)) & 63;
out.write(chars[lookup]);
lookup = b & 63; // last six bits
out.write(chars[lookup]);
carryOver = 0;
}
charCount++;
// Add newline every 76 output chars (that's 57 input chars)
if (charCount % 57 == 0) {
out.write('\n');
}
}
/***
* Writes the given byte array to the output stream in an
* encoded form.
*
* @param buf the data to be written
* @param off the start offset of the data
* @param len the length of the data
* @exception IOException if an I/O error occurs
*/
public void write(byte[] buf, int off, int len) throws IOException {
// This could of course be optimized
for (int i = 0; i < len; i++) {
write(buf[off + i]);
}
}
/***
* Closes the stream, this MUST be called to ensure proper padding is
* written to the end of the output stream.
*
* @exception IOException if an I/O error occurs
*/
public void close() throws IOException {
// Handle leftover bytes
if (charCount % 3 == 1) { // one leftover
int lookup = (carryOver << 4) & 63;
out.write(chars[lookup]);
out.write('=');
out.write('=');
}
else if (charCount % 3 == 2) { // two leftovers
int lookup = (carryOver << 2) & 63;
out.write(chars[lookup]);
out.write('=');
}
super.close();
}
/***
* Returns the encoded form of the given unencoded string. The encoder
* uses the ISO-8859-1 (Latin-1) encoding to convert the string to bytes.
* For greater control over the encoding, encode the string to bytes
* yourself and use encode(byte[]).
*
* @param unencoded the string to encode
* @return the encoded form of the unencoded string
*/
public static String encode(String unencoded) {
byte[] bytes = null;
try {
bytes = unencoded.getBytes("UTF-8");
}
catch (UnsupportedEncodingException ignored) { }
return encode(bytes);
}
/***
* Returns the encoded form of the given unencoded string.
*
* @param bytes the bytes to encode
* @return the encoded form of the unencoded string
*/
public static String encode(byte[] bytes) {
ByteArrayOutputStream out =
new ByteArrayOutputStream((int) (bytes.length * 1.37));
Base64Encoder encodedOut = new Base64Encoder(out);
try {
encodedOut.write(bytes);
encodedOut.close();
return out.toString("UTF-8");
}
catch (IOException ignored) { return null; }
}
public static void main(String[] args) throws Exception {
if (args.length != 1) {
System.err.println(
"Usage: java com.oreilly.servlet.Base64Encoder fileToEncode");
return;
}
Base64Encoder encoder = null;
BufferedInputStream in = null;
try {
encoder = new Base64Encoder(System.out);
in = new BufferedInputStream(new FileInputStream(args[0]));
byte[] buf = new byte[4 * 1024]; // 4K buffer
int bytesRead;
while ((bytesRead = in.read(buf)) != -1) {
encoder.write(buf, 0, bytesRead);
}
}
finally {
if (in != null) in.close();
if (encoder != null) encoder.close();
}
}
}