public class DESEncrypt {
/** 加密工具 */
private Cipher encryptCipher = null;
/** 解密工具 */
private Cipher decryptCipher = null;
private static String keyVal = "asdf1234";
public DESEncrypt(){
try {
this.initialize_encryptKey(keyVal);
this.initalize_dencryptkey(keyVal);
} catch (Exception e) {
e.printStackTrace();
}
}
private void initialize_encryptKey(String keyValue) throws Exception{
Key key = getKey(keyValue.getBytes());
encryptCipher = Cipher.getInstance("DES");
encryptCipher.init(Cipher.ENCRYPT_MODE, key);
}
public void initalize_dencryptkey(String keyValue) throws Exception {
Key key = getKey(keyValue.getBytes());
decryptCipher = Cipher.getInstance("DES");
decryptCipher.init(Cipher.DECRYPT_MODE, key);
}
/**
* 从指定字符串生成密钥，密钥所需的字节数组长度为8位 不足8位时后面补0，超出8位只取前8位
*
* @param arrBTmp
* 构成该字符串的字节数组
* @return 生成的密钥
* @throws java.lang.Exception
*/
private Key getKey(byte[] arrBTmp) throws Exception {
// 创建一个空的8位字节数组（默认值为0）
byte[] arrB = new byte[];
// 将原始字节数组转换为8位
for (int i = ; i < arrBTmp.length && i < arrB.length; i++) {
arrB[i] = arrBTmp[i];
}
// 生成密钥
Key key = new javax.crypto.spec.SecretKeySpec(arrB, "DES");
return key;
}
/**
* 加密字节数组
*
* @param arrB
* 需加密的字节数组
* @return 加密后的字节数组
* @throws Exception
*/
public byte[] encrypt(byte[] arrB) throws Exception {
return encryptCipher.doFinal(arrB);
}
/**
* 解密字节数组
*
* @param arrB
* 需解密的字节数组
* @return 解密后的字节数组
* @throws Exception
*/
public byte[] decrypt(byte[] arrB) throws Exception {
return decryptCipher.doFinal(arrB);
}
/**
* 文件file进行加密并保存目标文件destFile中
*
* @param file
* 要加密的文件 如c:/test/srcFile.txt
* @param destFile
* 加密后存放的文件名 如c:/加密后文件.txt
*/
public void encrypt(String sourceFileName, String diminationFileName) throws Exception {
InputStream is = new FileInputStream(sourceFileName);
OutputStream out = new FileOutputStream(diminationFileName);
CipherInputStream cis = new CipherInputStream(is, encryptCipher);
byte[] buffer = new byte[];
int r;
while ((r = cis.read(buffer)) > -) {
out.write(buffer, , r);
}
cis.close();
is.close();
out.close();
}
public void encrypt(File sourceFile, File diminationFile) throws Exception {
InputStream is = new FileInputStream(sourceFile);
OutputStream out = new FileOutputStream(diminationFile);
CipherInputStream cis = new CipherInputStream(is, encryptCipher);
byte[] buffer = new byte[];
int r;
while ((r = cis.read(buffer)) > -) {
out.write(buffer, , r);
}
cis.close();
is.close();
out.close();
}
/**
* 文件采用DES算法解密文件
*
* @param file
* 已加密的文件 如c:/加密后文件.txt * @param destFile 解密后存放的文件名 如c:/
* test/解密后文件.txt
*/
public void decrypt(String sourceFileName, String diminationFileName) throws Exception {
InputStream is = new FileInputStream(sourceFileName);
OutputStream out = new FileOutputStream(diminationFileName);
CipherOutputStream cos = new CipherOutputStream(out, decryptCipher);
byte[] buffer = new byte[];
int r;
while ((r = is.read(buffer)) >= ) {
cos.write(buffer, , r);
}
cos.close();
out.close();
is.close();
}
public void decrypt(File sourceFile, File fileout ) throws Exception {
InputStream is = new FileInputStream(sourceFile);
OutputStream out = new FileOutputStream(fileout);
CipherOutputStream cos = new CipherOutputStream(out, decryptCipher);
byte[] buffer = new byte[];
int r;
while ((r = is.read(buffer)) >= ) {
cos.write(buffer, , r);
}
cos.close();
out.close();
is.close();
}
public static void main(String[] args) throws Exception {
DESEncrypt t = new DESEncrypt();
//t.initialize_encryptKey(keyVal);
//t.initalize_dencryptkey(keyVal);
Long l = System.currentTimeMillis();
System.out.println("开始"+l);
t.encrypt("e:/ceshi.sql", "e:/ceshi2.sql");
System.out.println("结束"+(System.currentTimeMillis()-l));
t.decrypt("e:/ceshi2.sql", "e:/ceshi3.sql");
System.out.println("结束2"+(System.currentTimeMillis()-l));
}
}凑150字凑150字凑150字凑150字凑150字凑150字凑150字凑150字凑150字凑150字凑150字凑150字凑150字凑150字凑150字凑150字凑150字凑150字凑150字凑150字凑150字凑150字凑150字凑150字凑150字凑150字凑150字凑150字凑150字凑150字凑150字凑150字凑150字凑150字凑150字凑150字