More SecurityContext calls accept a password.

tests/standalone/io/certificates/README

     This directory, tests/standalone/io/certificates, contains the
 X509 TLS certificates and private keys needed to run tests of Dart's
 secure networking code.  The SecureSocket and SecureServer classes
 are tested by making TLS (formerly called SSL) connections, secured
 by certificates from a self-signed test root authority.
 
 The certificates are created by running ../create_sample_certificates.sh
 in a bash or sh shell, with the openssl tools installed.  Run the script
 twice to create the untrusted_* files.
 
+PEM files:
+
 server_chain.pem:
   Contains the chain of certificates, from the self-signed
 test certificate authority, through the intermediate CA, to the server
 certificate, used on the server side of a test connection.
 
 server_key.pem:
   Contains the private key for the server certificate
 
 trusted_certs.pem:
   Contains the self-signed certificate of the test certificate authority.
 This certificate is set as "trusted" by the client side of the connection
 in its SecurityContext object, so that a verified TLS connection to the
 server can be made.
 
 untrusted_server_chain.pem:
   Contains a chain of certificates, from a different self-signed
 test certificate authority, through an intermediate CA, to a server
 certificate, used on the server side of a test connection that is intended
 to fail because the client does not accept this certificate authority
 
 untrusted_server_key.pem:
-  Contains the private key for the untrusted server certificate 
+  Contains the private key for the untrusted server certificate
 in untrusted_server_chain.pem
 
+*_malformed.pem:
+  Truncated PEM formatted certificates used to test error handling.
+
+PKCS12 files:
+
+server_key.12:
+  Created with:
+  $ openssl pkcs12 -export -inkey server_key.pem -out server_key.p12 -nocerts
+  with password 'dartdart'
+
+server_chain.p12:
+  Created with:
+  $ openssl pkcs12 -export -in server_chain.pem -out server_chain.p12 -nokeys
+  with password 'dartdart'
+
+client1_key.p12:
+  Created with:
+  $ openssl pkcs12 -export -inkey client1_key.pem -out client1_key.p12 -nocerts
+  with password 'dartdart'
+
+client1.p12:
+  Created with:
+  $ openssl pkcs12 -export -in client1.pem -out client1.p12 -nokeys
+  with password 'dartdart'
+
+trusted_certs.p12:
+  Created with:
+  $ openssl pkcs12 -export -in trusted_certs.pem -out trusted_certs.p12 -nokeys
+  with password 'dartdart'
+
+client_authority.p12:
+  Created with:
+  $ openssl pkcs12 -export -in client_authority.pem -out client_authority.p12 -nokeys
+  with password 'dartdart'