C++ 和 Qt 5 中的 AES 256 加密
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AES 256 encryption in C++ and Qt 5
提问by Parth Doshi
I have a Java code for encryption in place as follows!
我有一个用于加密的 Java 代码，如下所示！
private static byte[] encrypt(byte[] raw, byte[] clear) throws
Exception {
SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
Cipher cipher = null;
if(isIVUsedForCrypto) {
cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, skeySpec, new IvParameterSpec(IV));
}
else
{
cipher = Cipher.getInstance("AES");
cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
}
byte[] encrypted = cipher.doFinal(clear);
return encrypted;
}
public static byte[] toByte(String hexString) {
int len = hexString.length()/2;
byte[] result = new byte[len];
try{
for (int i = 0; i < len; i++) {
result[i] = Integer.valueOf(hexString.substring(2*i, 2*i+2),16).byteValue();
}
}catch (Exception e) {
}
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));
}
From Java main method:
从Java主要方法：
byte[] result = encrypt(toByte(rawKey), plaintext.getBytes());
I need to write the C++ equivalent for the above methods (in java). I am not aware of the C++ classes for Cryptography and would like someone to please provide an example showing the same.
我需要为上述方法编写 C++ 等价物（在 Java 中）。我不知道密码学的 C++ 类，希望有人提供一个示例来显示相同的内容。
Thanks in advance
提前致谢
EDIT
编辑
My raw key would be in hexadecimal like -> 729308A8E815F6A46EB3A8AE6D5463CA7B64A0E2E11BC26A68106FC7697E727E
我的原始密钥将是十六进制的 -> 729308A8E815F6A46EB3A8AE6D5463CA7B64A0E2E11BC26A68106FC7697E727E
and my final encrypted password is --> 812DCE870D82E93DB62CDA66AAF37FB2
我最终的加密密码是 --> 812DCE870D82E93DB62CDA66AAF37FB2
This works in Java but I need a similar solution for C++
这适用于 Java，但我需要一个类似的 C++ 解决方案
回答by sorush-r
Try this:
尝试这个：
#include <crypto++/aes.h>
#include <crypto++/modes.h>
#include <crypto++/filters.h>
#include <crypto++/hex.h>
#include <crypto++/sha.h>
#include <crypto++/md5.h>
QString Foo::decrypt(const QString &password)
{
string plain;
string encrypted = password.toStdString();
// Hex decode symmetric key:
HexDecoder decoder;
decoder.Put( (byte *)PRIVATE_KEY,32*2 );
decoder.MessageEnd();
word64 size = decoder.MaxRetrievable();
char *decodedKey = new char[size];
decoder.Get((byte *)decodedKey, size);
// Generate Cipher, Key, and CBC
byte key[ AES::MAX_KEYLENGTH ], iv[ AES::BLOCKSIZE ];
StringSource( reinterpret_cast<const char *>(decodedKey), true,
new HashFilter(*(new SHA256), new ArraySink(key, AES::MAX_KEYLENGTH)) );
memset( iv, 0x00, AES::BLOCKSIZE );
try {
CBC_Mode<AES>::Decryption Decryptor
( key, sizeof(key), iv );
StringSource( encrypted, true,
new HexDecoder(new StreamTransformationFilter( Decryptor,
new StringSink( plain ) ) ) );
}
catch (Exception &e) { // ...
}
catch (...) { // ...
}
return QString::fromStdString(plain);
}
QString Foo::encrypt(const QString &password)
{
string plain = password.toStdString();
string ciphertext;
// Hex decode symmetric key:
HexDecoder decoder;
decoder.Put( (byte *)PRIVATE_KEY, 32*2 );
decoder.MessageEnd();
word64 size = decoder.MaxRetrievable();
char *decodedKey = new char[size];
decoder.Get((byte *)decodedKey, size);
// Generate Cipher, Key, and CBC
byte key[ AES::MAX_KEYLENGTH ], iv[ AES::BLOCKSIZE ];
StringSource( reinterpret_cast<const char *>(decodedKey), true,
new HashFilter(*(new SHA256), new ArraySink(key, AES::MAX_KEYLENGTH)) );
memset( iv, 0x00, AES::BLOCKSIZE );
CBC_Mode<AES>::Encryption Encryptor( key, sizeof(key), iv );
StringSource( plain, true, new StreamTransformationFilter( Encryptor,
new HexEncoder(new StringSink( ciphertext ) ) ) );
return QString::fromStdString(ciphertext);
}
Update:
更新：
Use above code as follows:
使用上面的代码如下：
//...
#define PRIVATE_KEY "729308A8E815F6A46EB3A8AE6D5463CA7B64A0E2E11BC26A68106FC7697E727E37011"
QString encrypted = Foo::encryptPassword("test");
// use encrypted
Personally I don't like to reveal private key in source code. So I'll pass it to compiler in command line:
我个人不喜欢在源代码中透露私钥。所以我会在命令行中将它传递给编译器：
g++ -DPRIVATE_KEY \"\"\"123...\"\"\" ...
Where PRIVATE_KEY is your private key in plain text. If you have the key in HEX encode, just remove Hex decode symmetric keystep.
其中 PRIVATE_KEY 是纯文本形式的私钥。如果您有十六进制编码的密钥，只需删除Hex decode symmetric key步骤。
