title: Cannot convert apple developer_identity.cer into .p12 format. No certificate matches private key
body: <p>i have following problem:</p>
  <p>i have these files</p>
  <blockquote>
  <p>developer_identity.cer</p>
  <p>Team_Provisioning_Profile_.mobileprovision</p>
  </blockquote>
  <p>In order to package adobe flex mobile application for iOS, i need to convert my .cer certificate into .p12 format. Following this tutorial <a href="http://help.adobe.com/en_US/as3/iphone/WS144092a96ffef7cc-371badff126abc17b1f-7fff.html" rel="nofollow noreferrer">on help.adobe.com</a> i always get this problem when executing last openssl command:</p>
  <p>&quot;no certificate matches private key <br/>
  error in pkcs12&quot;</p>
  <p>From what i understand i need somehow to get private key, that was used to create the  certificate (do i understand this well??). How do i get the private key mykey.key if i only have .cer and .mobileprovision files mentioned above?</p>