Gets the {@code subjectUniqueID} value from the certificate.
<p>The ASN.1 definition for this is: <pre> subjectUniqueID [2] IMPLICIT UniqueIdentifier OPTIONAL
UniqueIdentifier ::= BIT STRING </pre>
@return the subject unique identifier or null if it is not present in the certificate.
See Implementation
Gets the {@code subjectUniqueID} value from the certificate.
<p>The ASN.1 definition for this is: <pre> subjectUniqueID [2] IMPLICIT UniqueIdentifier OPTIONAL
UniqueIdentifier ::= BIT STRING </pre>
@return the subject unique identifier or null if it is not present in the certificate.