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Question:

Decryption problem with newer version of ChilkatDotNet2.dll

Nov 24 '16 at 02:00

I have an encrypted string (with ChilkatDotNet2.dll 9.5.0.45) which I want to decrypt with the current version 9.5.0.64. This doesn't work.

Her my code to decrypt:

    static void Main(string[] args)
        {
            var encryptedText = "01A30BD25F16A525ACFD8DC840D94F6626A52036ECD4ECFCCB6B74C7CD3CCA24D0069B1C114AFBD0D37251A6AE380471F5FD4E99EE8013C2E754750C5C7A87FB12F0E93BE0F4DC6B6CE9BBDDA1853245EFF78B45CAC8887E9341C57080500732BE6EA8E5298E3085";
            var pwd = "123456";

            var crypt = new Crypt2();
            var success = crypt.UnlockComponent("???");
            if (success != true)
            {
                return;
            }
            crypt.CryptAlgorithm = "pbes2";
            crypt.PbesPassword = pwd;
            crypt.PbesAlgorithm = "rc2";
            crypt.KeyLength = 128;
            crypt.Rc2EffectiveKeyLength = 128;
            crypt.SetEncodedIV("0000000000000000", "hex");
            crypt.SetEncodedSalt("0102030405060708", "hex");
            crypt.IterationCount = 1024;
            crypt.HashAlgorithm = "sha1";
            crypt.EncodingMode = "hex";

            var decryptedText = crypt.DecryptStringENC(encryptedText);
        }

with version 9.5.0.45 the decrypted string is: "cpsdyfrgmVlC43X8iVdWeP21lNcyYkIT23xzSkuKOtVSspcGeUQXVbaOew==9d5f58d7-fa9c-40ed-b08b-b97604f21d54" which it should be

with version 9.5.0.64 the decrypted string is: "´¥ª]RÚ¼°u0014ðnÌZÉ:éé"

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Answer

the other direction (encryption with 9.5.0.64 and decryption with 9.5.0.45) also doesn't work

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Answer

Thanks, I'm having a look..

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Answer

Here's a new build with the fix:

http://chilkatdownload.com/prerelease/chilkatdotnet2-9.5.0-win32.zip
http://chilkatdownload.com/prerelease/chilkatdotnet2-9.5.0-x64.zip

At some point since v9.5.0.45, there was a copy/paste error introduced in the internals such that PBES1 was being used instead of PBES2. This is now fixed, and the results should be the same.

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Answer

Thanks for your quick answer. Seems to work. When do you expect to release this version? I need also builds for other Frameworks and for C++.