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POEncrypt a string in Java so that a C program can decrypt it, without any padding in the decrypted text?
 

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  1. POEncrypt a string in Java so that a C program can decrypt it, without any padding in the decrypted text?
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    <p>I am doing a simple AES encryption in Java:</p> <pre><code>Cipher cipher = Cipher.getInstance("AES"); cipher.init(Cipher.ENCRYPT_MODE, getAES128SecretKey()); byte[] encrypted = cipher.doFinal(input); </code></pre> <p>The output is converted to hex and stored in a database.</p> <p>A later process (one written in C/C++) comes along and reads the hex, converts it to bytes and decrypts it.</p> <p>The issue is apparently the C implementation correctly decrypts the text, but also keeps extra bytes at the end that are unnecessary.</p> <p>For example (not real values):</p> <pre><code>Java: encrypt("eric") -&gt; 1234567890FFFFFF1234567890FFFFFF (hex) Java: decrypt("1234567890FFFFFF1234567890FFFFFF") -&gt; "eric" C: decrypt("1234567890FFFFFF1234567890FFFFFF") -&gt; "eric XXXX XXXX XXXX" </code></pre> <p>I do not own the C decryption algorithm and the party using it has suggested I append a null terminator character <code>'\0'</code> to the Java bytes before encryption. My question is, would that work and should I even entertain that idea? </p> <p>Reading the first answer (while "unaccepted", it sounds correct to me) to the question <a href="https://stackoverflow.com/questions/1927380/padding-error-when-using-aes-encryption-in-java-and-decryption-in-c">Padding error when using AES encryption in Java and decryption in c</a>, an explicit encoding of the padding size seems to be the correct way to go about this.</p> <p>However, what if the string is encrypted in C and decrypted in C? Will the C encrypted string now have issues when decrypted in C, and removing the padding as if it were a Java encrypted string? Or would this be a non-issue?</p>
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    1. COJava and C in the same question. It's like comparing a Harley and a tricycle... Java is the tricycle.
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    2. CO@Matt - Java is at least as cool as one of them there Razor scooters all the hip kids are riding now-days... ;)
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