8337951: Test sun/security/validator/samedn.sh CertificateNotYetValidException: NotBefore validation

Reviewed-by: mullan

Author: fguallini

test/jdk/sun/security/validator/samedn.sh

@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2010, 2024, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -62,10 +62,11 @@ $KT -genkeypair -alias ca1 -dname CN=CA -keyalg rsa -sigalg md5withrsa -ext bc -
 $KT -genkeypair -alias ca2 -dname CN=CA -keyalg rsa -sigalg sha1withrsa -ext bc -startdate -1y
 $KT -genkeypair -alias user -dname CN=User -keyalg rsa
 
-# 2. Signing: ca -> user
+# 2. Signing: ca -> user. The startdate is set to 1 minute in the past to ensure the certificate
+# is valid at the time of validation and to prevent any issues with timing discrepancies
 
-$KT -certreq -alias user | $KT -gencert -rfc -alias ca1 > samedn1.certs
-$KT -certreq -alias user | $KT -gencert -rfc -alias ca2 > samedn2.certs
+$KT -certreq -alias user | $KT -gencert -rfc -alias ca1 -startdate -1M > samedn1.certs
+$KT -certreq -alias user | $KT -gencert -rfc -alias ca2 -startdate -1M > samedn2.certs
 
 # 3. Append the ca file