[Objc] How to get SecKeyRef from base64 coded string

This quick iOS Application Development tip will show you How to get SecKeyRefM from base64 coded string, which for iOS 7 utilises: So, let’s assume that you have a base64 coded public key, like:

MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC3gn+tJ1+PbP0GHa6hmM35WsVyibpypWAwRuBYY4MGfh3VWoXgiyiLo5HJTW1eR9BUFq3z+yOG1rwzSabZ8I4zneWm0kH7xErSjNrMbmjirbL7e6TQNa1ujP/x4x9XVbqf3vIsNVs19kn/qSX/HGzd5Ct3TGAo0AT0T4JwkCfciwIDAQAB

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