Recent versions of OpenSSL refuse to load Romain's key:

  unable to load certificate
  140268475908992:error:0D0E20DE:asn1 encoding routines:c2i_ibuf:illegal zero content:../crypto/asn1/a_int.c:154:
  140268475908992:error:0D08303A:asn1 encoding routines:asn1_template_noexp_d2i:nested asn1 error:../crypto/asn1/tasn_dec.c:609:Field=serialNumber, Type=X509_CINF
  140268475908992:error:0D08303A:asn1 encoding routines:asn1_template_noexp_d2i:nested asn1 error:../crypto/asn1/tasn_dec.c:609:Field=cert_info, Type=X509
  140268475908992:error:0906700D:PEM routines:PEM_ASN1_read_bio:ASN1 lib:../crypto/pem/pem_oth.c:33:

With older versions:

  Certificate:
      Data:
          Version: 1 (0x0)
          Serial Number: 0 (0x0)
      ...
Acked-by: Romain Courteaud <romain@nexedi.com>