This and some other recent posts (`Is this a bug?`, `Hopefully a simple question...`). If you want help (and help other ppl who search for similar issues), could you please make the subject more descriptive?
On Fri, Jan 20, 2017 at 12:19 AM, Chris M. via Digitalmars-d-learn < digitalmars-d-learn@puremagic.com> wrote: > I have no idea if this is an issue with D, or OpenSSL, or if I'm just > doing something completely wrong. I'm writing a program that will either > encrypt or decrypt a string using AES in ECB mode (for a school assignment) > and it's giving me a very strange bug. > > encrypt and decrypt are both bools, either one or the other is set based > on command-line arguments passed to the program. aesKey is a 128-bit value > hashed from user input, and is (obviously) used as the key for encryption. > inputStr is either the string to be encrypted or decrypted (also passed in > as a command-line argument). I grabbed the OpenSSL bindings from Deimos to > do this. > > if(encrypt) > { > AES_KEY encKey; > auto encOut = new ubyte[inputStr.length]; > > // Encrypt and convert to base64 > AES_set_encrypt_key(aesKey.ptr, aesKey.sizeof * 8, &encKey); > AES_ecb_encrypt(inputStr.ptr, encOut.ptr, &encKey, AES_ENCRYPT); > writeln(Base64.encode(encOut)); > } > else if(decrypt) // I'd leave this as else, but it's here for explanation > purposes > { > AES_KEY decKey; > auto decLength = Base64.decodeLength(inputStr.length); > auto decB64 = new ubyte[decLength], decOut = new ubyte[decLength]; > > // convert back from base64 and decrypt > decB64 = Base64.decode(inputStr); // Yes I checked, and decB64 has > exact the same contents as encOut from the if block > AES_set_decrypt_key(aesKey.ptr, aesKey.sizeof * 8, &decKey); > AES_ecb_encrypt(decB64.ptr, decOut.ptr, &decKey, AES_DECRYPT); > writeln(cast(char[]) decOut); > } > > However, this isn't working for a very strange reason (spits back garbage > instead of the string I originally encrypted). > > Here's the problem. I tried running this without the if-else statements > (i.e. encrypting and decrypting all in one run of the program, code below). > If I leave in the base64 encoding and decoding, and use decB64 as the input > to decrypt, it still doesn't work. However, if I decrypt with encOut > directly, or assign encOut to decB64, it somehow works. > > AES_KEY encKey; > auto encOut = new ubyte[inputStr.length]; > > // Encrypt and convert to base64 > AES_set_encrypt_key(aesKey.ptr, aesKey.sizeof * 8, &encKey); > AES_ecb_encrypt(inputStr.ptr, encOut.ptr, &encKey, AES_ENCRYPT); > > auto decLength = Base64.decodeLength(Base64.encode(encOut).length); > AES_KEY decKey; > auto decB64 = new ubyte[decLength], decOut = new ubyte[decLength]; > > // convert back from base64 and decrypt > decB64 = Base64.decode(Base64.encode(encOut)); > // doesn't work unless I uncomment out the following line, or just use > encOut directly > //decB64 = encOut; > AES_set_decrypt_key(aesKey.ptr, aesKey.sizeof * 8, &decKey); > AES_ecb_encrypt(decB64.ptr, decOut.ptr, &decKey, AES_DECRYPT); > writeln(cast(char[]) decOut); > > tl;dr The decryption doesn't work unless I pass it the exact same buffer > (including not only contents, but apparently the exact same memory address) > that I used to receive output from encryption > > Does anyone have any idea where the issue may lie, or how I could fix this? > > Here's the full program if you want to take a look > http://pastebin.com/KyY103Ac >