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    <p>Don't know where you got the following code from</p> <pre><code>data_bytes = str.encode(request_params) key_bytes = str.encode(dev_key) iv_bytes = str.encode(dev_iv) </code></pre> <p>but you should know that it is equivalent to the following:</p> <pre><code>data_bytes = request_params.encode("ascii") key_bytes = dev_key.encode("ascii") iv_bytes = dev_iv.encode("ascii") </code></pre> <p>which means that non-ASCII characters in any of the three variables will cause an error (I hope you don't make up an AES key of ASCII characters only?).</p> <p>In Python 2.x, <code>str</code> objects (<code>byte[]</code> in C#) are bytes and <code>unicode</code> objects (<code>string</code> in C#) are for text. This confusing fact was changed in Python 3.x, by the way.<br/> That means if <code>request_params</code> is a Unicode object, you should encode it as UTF-8, and if it's a <code>str</code> object, you should assume (or check) that it is already encoded as UTF-8. So it might be something like:</p> <pre><code>if isinstance(request_params, unicode): data_bytes = request_params.encode("utf-8") else: request_params.decode("utf-8") # optional check whether it is correct UTF-8 data_bytes = request_params </code></pre> <p>As for key/IV, they will always be <em>binary</em> data (e.g. 16 bytes for AES-128), not text. So they don't have a character encoding. Remove those two lines of code and probably replace them with</p> <pre><code>assert len(dev_key) == block_size and len(dev_iv) == block_size </code></pre>
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    1. POWhat's the equivalent of C#'s GetBytes() in Python?
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