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@@ -0,0 +1,33 @@
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+<?php
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+
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+define('IMGPROXY_SIGNATURE_SIZE', 8 );
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+
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+$key = '943b421c9eb07c830af81030552c86009268de4e532ba2ee2eab8247c6da0881';
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+$salt = '520f986b998545b4785e0defbc4f3c1203f22de2374a3d53cb7a7fe9fea309c5';
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+
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+$keyBin = pack("H*" , $key);
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+if(empty($keyBin)) {
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+ die('Key expected to be hex-encoded string');
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+}
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+
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+$saltBin = pack("H*" , $salt);
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+if(empty($saltBin)) {
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+ die('Salt expected to be hex-encoded string');
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+}
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+
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+$resize = 'fill';
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+$width = 300;
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+$height = 300;
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+$gravity = 'no';
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+$enlarge = 1;
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+$extension = 'png';
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+
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+$url = 'http://img.example.com/pretty/image.jpg';
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+$encodedUrl = rtrim(strtr(base64_encode($url), '+/', '-_'), '=');
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+
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+$path = "/{$resize}/{$width}/{$height}/{$gravity}/{$enlarge}/{$encodedUrl}.{$extension}";
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+$signature = hash_hmac('sha256', $saltBin.$path, $keyBin, true);
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+$signature = pack('A'.IMGPROXY_SIGNATURE_SIZE, $signature);
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+$signature = rtrim(strtr(base64_encode($signature), '+/', '-_'), '=');
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+
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+print(sprintf("/%s%s", $signature, $path));
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