AES加密解密图片资源
AES.java
import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
public class AES {
/*
* encrypt key contain 26 letters and digitshere use AES-128-CBC model
* length must be 16
*/
private static String sKey = "1234567890987654";
private static String cPriKey = "1122334455667788";
public static String Encrypt(String sSrc) throws Exception {
if (sKey == null) {
System.out.print("Key id null");
return null;
}
// judge whethe Key's length is 16
if (sKey.length() != 16) {
System.out.print("Key's length is not 16");
return null;
}
byte[] raw = sKey.getBytes();
SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
IvParameterSpec iv = new IvParameterSpec(cPriKey.getBytes());// use CBC model
cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
byte[] encrypted = cipher.doFinal(sSrc.getBytes());
return Base64.encode(encrypted, 0, encrypted.length);
}
public static String Decrypt(String sSrc) throws Exception {
try {
if (sKey == null) {
System.out.print("Key id is null");
return null;
}
// Judge Whethe Key's Length Is 16
if (sKey.length() != 16) {
System.out.print("Key's length is not 16");
return null;
}
byte[] raw = sKey.getBytes("ASCII");
SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
IvParameterSpec iv = new IvParameterSpec(cPriKey.getBytes());
cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
byte[] encrypted1 = Base64.decode(sSrc, 0, sSrc.getBytes().length);
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;
}
}
}
Base64.java
import java.io.IOException;
public class Base64 {
private Base64() {}
/**
* This character array provides the alphabet map from RFC1521.
*/
private final static char ALPHABET[] = {
'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', '+', '/'
};
/**
* Decodes a 7 bit Base64 character into its binary value.
*/
private static int valueDecoding[] = new int[128];
/**
* initializes the value decoding array from the character map
*/
static {
for (int i = 0; i < valueDecoding.length; i++) {
valueDecoding[i] = -1;
}
for (int i = 0; i < ALPHABET.length; i++) {
valueDecoding[ALPHABET[i]] = i;
}
}
/**
* Converts a byte array into a Base64 encoded string.
*
* @param data
* bytes to encode
* @param offset
* which byte to start at
* @param length
* how many bytes to encode; padding will be added if needed
* @return base64 encoding of data; 4 chars for every 3 bytes
*/
public static String encode(byte[] data, int offset, int length) {
int i;
int encodedLen;
char[] encoded;
// 4 chars for 3 bytes, run input up to a multiple of 3
encodedLen = (length + 2) / 3 * 4;
encoded = new char[encodedLen];
for (i = 0, encodedLen = 0; encodedLen < encoded.length; i += 3, encodedLen += 4) {
encodeQuantum(data, offset + i, length - i, encoded, encodedLen);
}
return new String(encoded);
}
/**
* Encodes 1, 2, or 3 bytes of data as 4 Base64 chars.
*
* @param in
* buffer of bytes to encode
* @param inOffset
* where the first byte to encode is
* @param len
* how many bytes to encode
* @param out
* buffer to put the output in
* @param outOffset
* where in the output buffer to put the chars
*/
private static void encodeQuantum(byte in[], int inOffset, int len,
char out[], int outOffset) {
byte a = 0, b = 0, c = 0;
a = in[inOffset];
out[outOffset] = ALPHABET[(a >>> 2) & 0x3F];
if (len > 2) {
b = in[inOffset + 1];
c = in[inOffset + 2];
out[outOffset + 1] = ALPHABET[((a << 4) & 0x30) + ((b >>> 4) & 0xf)];
out[outOffset + 2] = ALPHABET[((b << 2) & 0x3c) + ((c >>> 6) & 0x3)];
out[outOffset + 3] = ALPHABET[c & 0x3F];
} else if (len > 1) {
b = in[inOffset + 1];
out[outOffset + 1] = ALPHABET[((a << 4) & 0x30) + ((b >>> 4) & 0xf)];
out[outOffset + 2] = ALPHABET[((b << 2) & 0x3c) + ((c >>> 6) & 0x3)];
out[outOffset + 3] = '=';
} else {
out[outOffset + 1] = ALPHABET[((a << 4) & 0x30) + ((b >>> 4) & 0xf)];
out[outOffset + 2] = '=';
out[outOffset + 3] = '=';
}
}
/**
* Converts a Base64 encoded string to a byte array.
*
* @param encoded
* Base64 encoded data
* @return decode binary data; 3 bytes for every 4 chars - minus padding
* @exception IOException
* is thrown, if an I/O error occurs reading the data
*/
public static byte[] decode(String encoded) throws IOException {
return decode(encoded, 0, encoded.length());
}
/**
* Converts an embedded Base64 encoded string to a byte array.
*
* @param encoded
* a String with Base64 data embedded in it
* @param offset
* which char of the String to start at
* @param length
* how many chars to decode; must be a multiple of 4
* @return decode binary data; 3 bytes for every 4 chars - minus padding
* @exception IOException
* is thrown, if an I/O error occurs reading the data
*/
public static byte[] decode(String encoded, int offset, int length)
throws IOException {
int i;
int decodedLen;
byte[] decoded;
// the input must be a multiple of 4
if (length % 4 != 0) {
throw new IOException("Base64 string length is not multiple of 4");
}
// 4 chars for 3 bytes, but there may have been pad bytes
decodedLen = length / 4 * 3;
if (encoded.charAt(offset + length - 1) == '=') {
decodedLen--;
if (encoded.charAt(offset + length - 2) == '=') {
decodedLen--;
}
}
decoded = new byte[decodedLen];
for (i = 0, decodedLen = 0; i < length; i += 4, decodedLen += 3) {
decodeQuantum(encoded.charAt(offset + i),
encoded.charAt(offset + i + 1),
encoded.charAt(offset + i + 2),
encoded.charAt(offset + i + 3), decoded, decodedLen);
}
return decoded;
}
/**
* Decode 4 Base64 chars as 1, 2, or 3 bytes of data.
*
* @param in1
* first char of quantum to decode
* @param in2
* second char of quantum to decode
* @param in3
* third char of quantum to decode
* @param in4
* forth char of quantum to decode
* @param out
* buffer to put the output in
* @param outOffset
* where in the output buffer to put the bytes
*/
private static void decodeQuantum(char in1, char in2, char in3, char in4,
byte[] out, int outOffset) throws IOException {
int a = 0, b = 0, c = 0, d = 0;
int pad = 0;
a = valueDecoding[in1 & 127];
b = valueDecoding[in2 & 127];
if (in4 == '=') {
pad++;
if (in3 == '=') {
pad++;
} else {
c = valueDecoding[in3 & 127];
}
} else {
c = valueDecoding[in3 & 127];
d = valueDecoding[in4 & 127];
}
if (a < 0 || b < 0 || c < 0 || d < 0) {
throw new IOException("Invalid character in Base64 string");
}
// the first byte is the 6 bits of a and 2 bits of b
out[outOffset] = (byte) (((a << 2) & 0xfc) | ((b >>> 4) & 3));
if (pad < 2) {
// the second byte is 4 bits of b and 4 bits of c
out[outOffset + 1] = (byte) (((b << 4) & 0xf0) | ((c >>> 2) & 0xf));
if (pad < 1) {
// the third byte is 2 bits of c and 4 bits of d
out[outOffset + 2] = (byte) (((c << 6) & 0xc0) | (d & 0x3f));
}
}
}
}
数据处理类：DataTools.java
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
public class DataTools {
public static final byte[] InputStreamToByte(InputStream inStream)
throws IOException {
ByteArrayOutputStream swapStream = new ByteArrayOutputStream();
byte[] buff = new byte[100];
int rc = 0;
while ((rc = inStream.read(buff, 0, 100)) > 0) {
swapStream.write(buff, 0, rc);
}
byte[] in2b = swapStream.toByteArray();
return in2b;
}
public static String InputStreamTOString(InputStream is) {
/*
* To convert the InputStream to String we use the
* BufferedReader.readLine() method. We iterate until the BufferedReader
* return null which means there's no more data to read. Each line will
* appended to a StringBuilder and returned as String.
*/
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
StringBuilder sb = new StringBuilder();
String line = null;
try {
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
} catch (IOException e) {
} finally {
try {
is.close();
} catch (IOException e) {
}
}
return sb.toString();
}
/**
* 将String转换成InputStream
*
* @param in
* @return
* @throws Exception
*/
public static InputStream StringTOInputStream(String in) throws Exception {
ByteArrayInputStream is = new ByteArrayInputStream(
in.getBytes("ISO-8859-1"));
return is;
}
/**
* 将byte数组转换成InputStream
*
* @param in
* @return
* @throws Exception
*/
public static InputStream byteTOInputStream(byte[] in) throws Exception {
ByteArrayInputStream is = new ByteArrayInputStream(in);
return is;
}
/**
* 将byte数组转换成String
*
* @param in
* @return
* @throws Exception
*/
public static String byteTOString(byte[] in) throws Exception {
String string = new String(in, "ISO-8859-1");
return string;
}
public static String byteTOString(byte[] in, String type) throws Exception {
String string = new String(in, type);
return string;
}
/***
* half-angle Convert to full-angle
*
* @param input
* @return
*/
public static String ToDBC(String input) {
char[] c = input.toCharArray();
for (int i = 0; i < c.length; i++) {
if (c[i] == 12288) {
c[i] = (char) 32;
continue;
}
if ((c[i] > 65280) && (c[i] < 65375)) {
c[i] = (char) (c[i] - 65248);
}
}
return new String(c);
}
}
使用方法：
public class Main {
/**
* @param args
*/
public static void main(String[] args) {
File file2 = new File("c:\\Users\\zoeice\\Desktop\\111111.png");
InputStream is = null;
BufferedImage bi = null;
try {
bi = ImageIO.read(file2);
} catch (IOException e) {
e.printStackTrace();
}
ByteArrayOutputStream bs = new ByteArrayOutputStream();
ImageOutputStream imOut;
try {
imOut = ImageIO.createImageOutputStream(bs);
ImageIO.write(bi, "png",imOut);
is= new ByteArrayInputStream(bs.toByteArray());
} catch (IOException e) {
e.printStackTrace();
}
System.out.println("原始数据：" + DataTools.InputStreamTOString(is));
try {
String str = AES.Encrypt(DataTools.InputStreamTOString(is));
System.out.println("加密以后：" +str);
System.out.println("解密以后："+AES.Decrypt(str));
} catch (Exception e) {
e.printStackTrace();
}
}
}