While trying to implement federation, I was getting code 500 errors
  when trying to get a SAML assertion from a Keystone instance
  configured as identity provider. This is what the Keystone log showed:

INFO keystone.common.wsgi [-] POST
http://172.29.236.100:5000/v3/auth/OS-FEDERATION/saml2/ecp
ERROR keystone.contrib.federation.idp [-] Error when signing
assertion, reason: Command '['xmlsec1', '--sign', '--privkey-pem',
'/etc/ssl/private/signing_key.pem,/etc/ssl/
  certs/signing_cert.pem', '--id-attr:ID', 'Assertion',
'/tmp/tmpfXz0D4']' returned non-zero exit status 1
      2015-06-24 21:54:46.482 13569 WARNING keystone.common.wsgi [-]
An unexpected error prevented the server from fulfilling your request.

It is not clear what the problem is from the logs
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