How do I convert an XML RSA key to a PEM file?

Question

I have two XML files, structured as follows:

My Key

   ... 
   ..         


        

Answer 1

For those who want the resulting PEM to be readable by BouncyCastle:

1. use XMLSec2PEM tool to get a pem file
2. convert pem to pkcs8 and back (!)

The final solution I am happy with:

1. java XMLSec2PEM my.xml > my.pem
2. edit my.pem manually a bit
3. org.bouncycastle.openssl.PEMReader.readObject() returns null :-(
4. openssl pkcs8 -topk8 -inform pem -in my.pem -outform pem -nocrypt -out my.pkcs8
5. openssl pkcs8 -inform pem -nocrypt -in my.pkcs8 -out my.pkcs8.pem
6. now my.pkcs8.pem is readable with the PEMReader