CODEWITHSUNDEEP
javac++encryption
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Lightstar

Reputation: 193

Encrypting a string in Java and decrypting it in C++. What i have to do more?

I need to encrypt a string in Java and decrypt it in C++. I've seen C++ has a Crypto++ library and Java has JCE.

For c++, I refer to this page

http://social.msdn.microsoft.com/Forums/ko-KR/bd1722e7-07b3-4119-b7de-10788f9f6e36/aes-string-encryption-in-c?forum=windowsmobiledev

The result is defferent.

In java abcd1234 7e77643ca7d46d46298be3239f1a5cdb abcd1234

In c++ Strange characters...

What i have to do?

Upvotes: 0

Views: 382

Answers (2)

Robert
Robert

Reputation: 42585

One of your problems is that your "key" is derived from a String which gives you different results for Java and C:

Java: "abcdefgh12345678".getBytes() gets you the UTF-8 (Linux) or ISO-8859-1 (Windows) representation. In any way the characters are interpreted as 8bit characters and you are getting a 16 byte long array.

C: You are using a WCHAR which uses AFAIK a 16bit unicode characters. Therefore your key is in the end 32 byte long.

Conclusion: Different keys means different results...

Important: Please never ever use ASCII characters as a cryptographic key! If you want to encrypt something using a password use a password derivation function like PBKDF2 for generating a cryptographic from the password.

For testing purposes you can statically define a byte/char array in your code:

char myArray[] = { 0x00, 0x11, 0x22 }; // c
byte[] myArray = new byte[]{ 0x00, 0x11, 0x22 }; // Java

Upvotes: 2

Boo
Boo

Reputation: 673

apparently the java version is displayed in hex to string format,try this

for (int i = 0 ; i < 16 ; ++i)
std::cout << std::hex << static_cast<int>(buf[i]);
std::cout << std::endl;

edit : return byteArrayToHex(encrypted); in your java code does the same on the bytearray

Upvotes: 1

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