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分享关于文件的AES加密的难题
下边是一个字符串的AES加密，谁能把他扩展成为可以为文件或文件流的加密？
package Fastmule.Android;
import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
/*
加密 –
1.String encryptingCode = SimpleCrypto.encrypt(masterPassword,originalText);
解密 –
1.String originalText = SimpleCrypto.decrypt(masterpassword, encryptingCode);
*/
public class AES_String {
public static String encrypt(String seed, String cleartext) throws Exception {
byte[] rawKey = getRawKey(seed.getBytes());
byte[] result = encrypt(rawKey, cleartext.getBytes());
return toHex(result);
}
public static String decrypt(String seed, String encrypted) throws Exception {
byte[] rawKey = getRawKey(seed.getBytes());
byte[] enc = toByte(encrypted);
byte[] result = decrypt(rawKey, enc);
return new String(result);
}
private static byte[] getRawKey(byte[] seed) throws Exception {
KeyGenerator kgen = KeyGenerator.getInstance("AES");
SecureRandom sr = SecureRandom.getInstance("SHA1PRNG");
sr.setSeed(seed);
kgen.init(128, sr); // 192 and 256 bits may not be available
SecretKey skey = kgen.generateKey();
byte[] raw = skey.getEncoded();
return raw;
}
private static byte[] encrypt(byte[] raw, byte[] clear) throws Exception {
SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
byte[] encrypted = cipher.doFinal(clear);
return encrypted;
}
private static byte[] decrypt(byte[] raw, byte[] encrypted) throws Exception {
SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.DECRYPT_MODE, skeySpec);
byte[] decrypted = cipher.doFinal(encrypted);
return decrypted;
}
public static String toHex(String txt) {
return toHex(txt.getBytes());
}
public static String fromHex(String hex) {
return new String(toByte(hex));
}
public static byte[] toByte(String hexString) {
int len = hexString.length()/2;
byte[] result = new byte[len];
for (int i = 0; i < len; i++)
result[i] = Integer.valueOf(hexString.substring(2*i, 2*i+2), 16).byteValue();
return result;
}
public static String toHex(byte[] buf) {
if (buf == null)
return "";
StringBuffer result = new StringBuffer(2*buf.length);
for (int i = 0; i < buf.length; i++) {
appendHex(result, buf[i]);
}
return result.toString();
}
private final static String HEX = "0123456789ABCDEF";
private static void appendHex(StringBuffer sb, byte b) {
sb.append(HEX.charAt((b>>4)&0x0f)).append(HEX.charAt(b&0x0f));
}
}
...全文
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h98458 2011-02-25
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稍微改下：
可是在PHP加密过的文件，用JAVA解出来却是乱码
PHP的AES加密函数：
哪个能帮我看看，JAVA的解密程序哪里有问题吗？
// 加密文件
public static void EncryptFile(String pwd, File fileIn,File fileOut) throws Exception
{
try
{
//读文件
FileInputStream fis = new FileInputStream(fileIn);
byte[] bytIn=readbyte(fis);
//AES加密
KeyGenerator kgen = KeyGenerator.getInstance("AES");
kgen.init(128, new SecureRandom(pwd.getBytes()));
SecretKey skey = kgen.generateKey();
byte[] raw = skey.getEncoded();
SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
Cipher cipher = Cipher.getInstance("AES/ECB/NoPadding");
cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
//写文件
byte[] bytOut = cipher.doFinal(bytIn);
FileOutputStream fos = new FileOutputStream(fileOut);
InputStream sbs = new ByteArrayInputStream(bytOut);
fos.write(readbyte(sbs));
fos.close();
fis.close();
}
catch (Exception e)
{
throw new Exception(e.getMessage());
}
}
//解密文件
public static void DecryptFile(String pwd, File fileIn,File fileOut) throws Exception
{
try
{
//读文件
FileInputStream fis = new FileInputStream(fileIn);
byte[] bytIn=readbyte(fis);
//AES解密
KeyGenerator kgen = KeyGenerator.getInstance("AES");
kgen.init(256, new SecureRandom(pwd.getBytes()));
SecretKey skey = kgen.generateKey();
byte[] raw = skey.getEncoded();
SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
Cipher cipher = Cipher.getInstance("AES/ECB/NoPadding");
cipher.init(Cipher.DECRYPT_MODE, skeySpec);
//写文件
//byte[] bytIn_tmp = interceptByte(bytIn,8,8);
byte[] bytOut = cipher.doFinal(bytIn);
FileOutputStream fos = new FileOutputStream(fileOut);
InputStream sbs = new ByteArrayInputStream(bytOut);
fos.write(readbyte(sbs));
fos.close();
fis.close();
}
catch (Exception e)
{
throw new Exception(e.getMessage());
}
}
可是在PHP加密过的文件，用JAVA解出来却是乱码
PHP的AES加密函数：
function fnEncrypt($sValue, $sSecretKey)
{
return trim(mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $sSecretKey, $sValue, MCRYPT_MODE_ECB, mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_ECB), MCRYPT_RAND)));
}
哪个能帮我看看，JAVA的解密程序哪里有问题吗？
h98458 2011-02-23
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自己改进后：
现在可以对文件加密解密了
但是却解不了delphi用AES加密过的文件，同样的文件用php的AES却可以解密，郁闷了
解密delphi的AES加密文件出现：java.lang .Exception:last block incomplete in decryption错误
而自己加密解密却没问题
package Fastmule.Android;
import java.security.SecureRandom;
//文件流
import java.io.ByteArrayOutputStream;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
/*
加密 –
1.String encryptingCode = SimpleCrypto.encrypt(masterPassword,originalText);
解密 –
1.String originalText = SimpleCrypto.decrypt(masterpassword, encryptingCode);
*/
public class AES {
public static String encrypt(String seed, String cleartext) throws Exception {
byte[] rawKey = getRawKey(seed.getBytes());
byte[] result = encrypt(rawKey, cleartext.getBytes());
return toHex(result);
}
public static String decrypt(String seed, String encrypted) throws Exception {
byte[] rawKey = getRawKey(seed.getBytes());
byte[] enc = toByte(encrypted);
byte[] result = decrypt(rawKey, enc);
return new String(result);
}
private static byte[] getRawKey(byte[] seed) throws Exception {
KeyGenerator kgen = KeyGenerator.getInstance("AES");
SecureRandom sr = SecureRandom.getInstance("SHA1PRNG");
sr.setSeed(seed);
kgen.init(128, sr); // 192 and 256 bits may not be available
SecretKey skey = kgen.generateKey();
byte[] raw = skey.getEncoded();
return raw;
}
private static byte[] encrypt(byte[] raw, byte[] clear) throws Exception {
SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
byte[] encrypted = cipher.doFinal(clear);
return encrypted;
}
private static byte[] decrypt(byte[] raw, byte[] encrypted) throws Exception {
SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.DECRYPT_MODE, skeySpec);
byte[] decrypted = cipher.doFinal(encrypted);
return decrypted;
}
public static String toHex(String txt) {
return toHex(txt.getBytes());
}
public static String fromHex(String hex) {
return new String(toByte(hex));
}
public static byte[] toByte(String hexString) {
int len = hexString.length()/2;
byte[] result = new byte[len];
for (int i = 0; i < len; i++)
result[i] = Integer.valueOf(hexString.substring(2*i, 2*i+2), 16).byteValue();
return result;
}
public static String toHex(byte[] buf) {
if (buf == null)
return "";
StringBuffer result = new StringBuffer(2*buf.length);
for (int i = 0; i < buf.length; i++) {
appendHex(result, buf[i]);
}
return result.toString();
}
// 加密文件
public static void EncryptFile(String pwd, File fileIn,File fileOut) throws Exception
{
try
{
//读取文件
FileInputStream fis = new FileInputStream(fileIn);
byte[] bytIn=readbyte(fis);
//AES加密
KeyGenerator kgen = KeyGenerator.getInstance("AES");
kgen.init(128, new SecureRandom(pwd.getBytes()));
SecretKey skey = kgen.generateKey();
byte[] raw = skey.getEncoded();
SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
//写文件
byte[] bytOut = cipher.doFinal(bytIn);
FileOutputStream fos = new FileOutputStream(fileOut);
InputStream sbs = new ByteArrayInputStream(bytOut);
fos.write(readbyte(sbs));
fos.close();
fis.close();
}
catch (Exception e)
{
throw new Exception(e.getMessage());
}
}
// 解密文件
public static void DecryptFile(String pwd, File fileIn,File fileOut) throws Exception
{
try
{
//读取文件
FileInputStream fis = new FileInputStream(fileIn);
byte[] bytIn=readbyte(fis);
//AES解密
KeyGenerator kgen = KeyGenerator.getInstance("AES");
kgen.init(128, new SecureRandom(pwd.getBytes()));
SecretKey skey = kgen.generateKey();
byte[] raw = skey.getEncoded();
SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.DECRYPT_MODE, skeySpec);
//写文件
byte[] bytOut = cipher.doFinal(bytIn);
FileOutputStream fos = new FileOutputStream(fileOut);
InputStream sbs = new ByteArrayInputStream(bytOut);
fos.write(readbyte(sbs));
fos.close();
fis.close();
}
catch (Exception e)
{
throw new Exception(e.getMessage());
}
}
//读取InputStream转换为byte函数 ----2011-02-23 by hrg
protected static byte[] readbyte(InputStream stream)
{
try
{
ByteArrayOutputStream baos = new ByteArrayOutputStream( 8196 );
byte[] buffer = new byte[1024];
int length = 0;
while ( ( length = stream.read( buffer ) ) > 0 )
{
baos.write( buffer, 0, length );
}
return baos.toByteArray();
}
catch ( Exception exception )
{
return exception.getMessage().getBytes();
}
}
private final static String HEX = "0123456789ABCDEF";
private static void appendHex(StringBuffer sb, byte b) {
sb.append(HEX.charAt((b>>4)&0x0f)).append(HEX.charAt(b&0x0f));
}
}
现在可以对文件加密解密了
但是却解不了delphi用AES加密过的文件，同样的文件用php的AES却可以解密，郁闷了
解密delphi的AES加密文件出现：java.lang .Exception:last block incomplete in decryption错误
而自己加密解密却没问题
jie2workce 2011-02-22
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加密。头痛了！
h98458 2011-02-22
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[Quote=引用 1 楼 ultrapro 的回复:]
可以对数据分段进行加密
[/Quote]
我也知道，但具体的实现明天再研究研究
可以对数据分段进行加密
[/Quote]
我也知道，但具体的实现明天再研究研究
儿大不由爷 2011-02-22
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可以对数据分段进行加密
