rsaSsaPssParams
Parses parameters as RSASSA-PSS parameters if this identifier uses the id-RSASSA-PSS OID.
This helper models RFC 4055, section 3.1 without making X509AlgorithmIdentifier itself enforce algorithm-specific parameter schemas during generic DER parsing.
Return
null if this algorithm is nor RSA_SSA_PSS
Throws
if this algorothm is RSA_SSA_PSS has no parameters, or the parameter element is not a valid RSASSA-PSS-params SEQUENCE.
Getter may throw but we cannot annotate due to https://youtrack.jetbrains.com/issue/KT-63047/Throws-annotation-on-getter-leads-to-compile-time-error-for-iOS-target