我有一个传统的C++模块,使用openssl库(DES加密)提供加密/解密.我正在尝试将该代码转换为java,我不想依赖DLL,JNI等... C++代码如下所示:
des_string_to_key(reinterpret_cast(key1), &initkey); des_string_to_key(reinterpret_cast (key2), &key); key_sched(&key, ks); // ... des_ncbc_encrypt(reinterpret_cast (tmp.c_str()), reinterpret_cast< unsigned char *>(encrypted_buffer), tmp.length(), ks, &initkey, DES_ENCRYPT); return base64(reinterpret_cast (encrypted_buffer), strlen(encrypted_buffer));
Java代码如下所示:
Cipher ecipher; try { ecipher = Cipher.getInstance("DES"); SecretKeySpec keySpec = new SecretKeySpec(key, "DES"); ecipher.init(Cipher.ENCRYPT_MODE, keySpec); byte[] utf8 = password.getBytes("UTF8"); byte[] enc = ecipher.doFinal(utf8); return new sun.misc.BASE64Encoder().encode(enc); } catch { // ... }
所以我可以很容易地在Java中进行DES加密,但是如何使用完全不同的方法获得与上述代码相同的结果?让我烦恼的是,C++版本使用2个密钥,而Java版本只使用1个密钥.在CBC模式下关于DES的答案非常令人满意,但我还不能让它工作.以下是有关原始代码的更多详细信息:unsigned char key1 [10] = {0}; unsigned char key2 [50] = {0};
int i; for (i=0;i<8;i++) key1[i] = 31+int((i*sqrt((double)i*5)))%100; key1[9]=0; for (i=0;i<48;i++) key2[i] = 31+int((i*i*sqrt((double)i*2)))%100; key2[49]=0; ... // Initialize encrypted buffer memset(encrypted_buffer, 0, sizeof(encrypted_buffer)); // Add begin Text and End Text to the encrypted message std::string input; const char beginText = 2; const char endText = 3; input.append(1,beginText); input.append(bufferToEncrypt); input.append(1,endText); // Add padding tmp.assign(desPad(input)); des_ncbc_encrypt(reinterpret_cast(tmp.c_str()), reinterpret_cast< unsigned char *>(encrypted_buffer), tmp.length(), ks, &initkey, DES_ENCRYPT); ...
从我所读到的,密钥应该是56(或64,我不清楚)位长,但这里它长48个字节.