AES 256 encryption in C++ and Qt 5

AES 256 encryption in C++ and Qt 5

本文关键字：and Qt C++ in encryption AES      更新时间：2023-10-16

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));  
}

来自Java主方法：

byte[] result = encrypt(toByte(rawKey), plaintext.getBytes());

我需要为上面的方法(用java)编写等价的C++。我不知道密码学的C++类，希望有人能提供一个例子来展示它。

提前感谢

编辑

我的原始密钥是十六进制的，如->729308A8E815F6A46EB3AA8AE6D5463CA7B64A0E2E11BC26A68106FC7697E727E

我的最终加密密码是-->812DCE870D82E93DB62CDA66AAF37FB2

这在Java中有效，但我需要一个类似的C++解决方案

试试这个：

#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);
}

更新：

使用以上代码如下：

//...
#define PRIVATE_KEY "729308A8E815F6A46EB3A8AE6D5463CA7B64A0E2E11BC26A68106FC7697E727E37011"
QString encrypted = Foo::encryptPassword("test");
// use encrypted

就我个人而言，我不喜欢在源代码中透露私钥。所以我将在命令行中把它传递给编译器：

g++ -DPRIVATE_KEY """123...""" ...

其中PRIVATE_KEY是纯文本形式的私钥。如果您有HEX编码的密钥，只需删除Hex decode symmetric key步骤。

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