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POLook for a step by step Domain-Key Signature creation guide for PHP
 

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  1. POLook for a step by step Domain-Key Signature creation guide for PHP
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    <p>So, I've lost some sleep, I've scoured the net and I've found libraries, explanations, etc., but I have not found a step by step guide to create a Domain-Key Signature to be added to an email header to sign my authenticated email sent from a PHP program. Actually, I have found some instructions but it always seems that a step is missing!</p> <p>Reading Jeff Atwood's <a href="http://www.codinghorror.com/blog/2010/04/so-youd-like-to-send-some-email-through-code.html" rel="nofollow">"So You'd Like to Send Some Email (Through Code)"</a> helped me out a great deal, and actually informed me about all of these signing methods. Thus far I have:</p> <ul> <li><p>Created a public/private key pair using openVPN and the following openssl commands</p> <ol> <li><p><code>openssl genrsa -out rsa.private 1024 -</code></p></li> <li><p><code>openssl rsa -in rsa.private -out rsa.public -pubout -outform PEM</code></p></li> </ol></li> <li><p>Had the necessary TXT DNS records added (global policy and the public base64 key) </p></li> <li>Added (what seem to be) the necessary parameters in the email header</li> </ul> <p>However, using Port25's Authentication Report returns:</p> <pre> DomainKeys check details: ---------------------------------------------------------- Result: fail (bad signature) ID(s) verified: header.From=truth@truthuniversal.com DNS record(s): truthuniversal._domainkey.truthuniversal.com. 86400 IN TXT "k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDdxr0auyWOszMhdPW0LR3/Duf3t6XcvlwTpYuoS1lzCuT35voqcEhctCh2dTzq2RAXOrinbG8HuTg/IBde3GWaRwBMSQRJ/ZwiNZHomMfqnZEhC9MT+J9OAEbm5TdwZ0HcIOKGBGi0fZvhYs5kw34mk0cwO7AacgSInDf+QjOE+QIDAQAB" </pre> <p>You can see the TXT Record there, which utilizes the key. </p> <p>Here's my public key produced with the openssl command -- file rsa.public:</p> <pre> -----BEGIN PUBLIC KEY----- MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDdxr0auyWOszMhdPW0LR3/Duf3 t6XcvlwTpYuoS1lzCuT35voqcEhctCh2dTzq2RAXOrinbG8HuTg/IBde3GWaRwBM SQRJ/ZwiNZHomMfqnZEhC9MT+J9OAEbm5TdwZ0HcIOKGBGi0fZvhYs5kw34mk0cw O7AacgSInDf+QjOE+QIDAQAB -----END PUBLIC KEY----- </pre> <p>In PHP, I'm constructing the header this way:</p> <pre><code> $pkey="MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDdxr0auyWOszMhdPW0LR3/Duf3t6XcvlwTpYuoS1lzCuT35voqcEhctCh2dTzq2RAXOrinbG8HuTg/IBde3GWaRwBMSQRJ/ZwiNZHomMfqnZEhC9MT+J9OAEbm5TdwZ0HcIOKGBGi0fZvhYs5kw34mk0cwO7AacgSInDf+QjOE+QIDAQAB"; $dkeysig = "DomainKey-Signature: a=rsa-sha1; s=truthuniversal;d=truthuniversal.com;c=simple;q=dns;b=$pkey;" $newLine = "\r\n"; //Construct Headers $headers = "MIME-Version: 1.0" . $newLine; $headers .= "Content-type: text/html; charset=iso-8859-1" . $newLine; $headers .= "$dkeysig" . $newLine; </code></pre> <p>When I check the header of the received message it looks this way:</p> <blockquote> <p>DomainKey-Signature: a=rsa-sha1; s=truthuniversal;d=truthuniversal.com;c=simple;q=dns;b=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDdxr0auyWOszMhdPW0LR3/Duf3t6XcvlwTpYuoS1lzCuT35voqcEhctCh2dTzq2RAXOrinbG8HuTg/IBde3GWaRwBMSQRJ/ZwiNZHomMfqnZEhC9MT+J9OAEbm5TdwZ0HcIOKGBGi0fZvhYs5kw34mk0cwO7AacgSInDf+QjOE+QIDAQAB;</p> </blockquote> <p>What am I missing?</p> <p>Is there another step?</p>
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    1. CO+1 for the link, however you should show how you generate the keys, the exact commands and their output. Not that you made a mistake there and it gets unnoticed.
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    2. CO@M8R-1jmw5r I added that information as you suggested. I used the genrsa command to generate the key pair. The contents of rsa.public is the public key I posted above. Do you need the private key info as well?
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      1. POLook for a step by step Domain-Key Signature creation guide for PHP
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    3. COThis must really be unpopular...
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