Java and c++ encrypted results not matching
base64, c++, java, security
Solution
Sigh!!
The problem almost certainly is that after you encrypt the data and receive the encrypted data as a byte string, you are doing some sort of character conversion on the data before sending it through Base-64 conversion.
Note that if you encrypt the strings "ABC_D_EFG" and "ABC_G_EFG", the encrypted output will be completely different starting with the 4th character, and continuing to the end. In other words, the Base-64 outputs would be something like (using made-up values):
U2FsdGVkX18xMj
and
U2FsdGXt91mJpz
The fact that, in the above examples, only two isolated Base-64 characters (one byte) are messed up in each case pretty much proves that the corruption occurs AFTER encryption.
The output of an encryption process is a byte sequence, not a character sequence. The corruption observed is consistent with erroneously interpreting the bytes as characters and attempting to perform a code page conversion on them, prior to feeding them into the Base-64 converter. The output from the encryptor should be fed directly into the Base-64 converter without any conversions.
You say you are using the "Latin-1 char set in both places", a clear sign that you are doing some conversion you should not be doing -- there should be no need to muck with char sets.
Problem
I have a existing c++ code which will encrypt a string. Now I did the same encryption in . Some of the encrypted strings are matching . Some are mismatching in one or two characters. I am unable to figure out why it is happening. I ran both the codes in debug mode until they call their libraries both have the same key, salt, iv string to be encrypted. I know that even if a single byte padding change will modify encrypted string drastically. But here I am just seeing a one or two characters change. Here is a sample (Bold characters in between stars is the part mis matching) java: U2FsdGVkX18xMjM0NTY3OGEL9nxFlHrWvodMqar82NT53krNkqat0rrgeV5FAJFs1vBsZIJPZ08DJVrQ*Pw*yV15HEoyECBeAZ6MTeN+ZYHRitKanY5jiRU2J0KP0Fzola C++: U2FsdGVkX18xMjM0NTY3OGEL9nxFlHrWvodMqar82NT53krNkqat0rrgeV5FAJFs1vBsZIJPZ08DJVrQ*jQ*yV15HEoyECBeAZ6MTeN+ZYHRitKanY5jiRU2J0KP0Fzola I am using AES encryption. provider is SunJCE version 1.6. I tried changing provider to Bouncy Castle. Even then result is same. Added One More sample: C++: U2FsdGVkX18xMjM0NTY3O*I*/BMu11HkHgnkx+dLPDU1lbfRwb+aCRrwkk7e9dy++MK+/94dKLPXaZDDlWlA3gdUNyh/Fxv*oF*STgl3QgpS0XU= java: U2FsdGVkX18xMjM0NTY3O*D*/BMu11HkHgnkx+dLPDU1lbfRwb+aCRrwkk7e9dy++MK+/94dKLPXaZDDlWlA3gdUNyh/Fxv*j9*STgl3QgpS0XU= UPDATE: As per the comments I feel base 64 encryption is the culprit. I am using Latin-1 char set in both places. Anything else that I can check