Summary
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Add RSASSA-PSS Signature support to SunMSCAPI, so that a private key generated and stored inside a native Windows keystore can be used to sign and verify using this algorithm. The algorithm is defined in PKCS#1 "RSA Cryptography Specifications" version 2.2 (RFC 8017).

Problem
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The SunMSCAPI security provider does not support the  RSASSA-PSS signature algorithm, which is mandatory for TLS 1.3. SunMSCAPI is the only security provider that can access a private key stored in a native Windows keystore.

Solution
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Add an RSASSA-PSS Signature implementation to the SunMSCAPI provider.

Specification
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In the SunMSCAPI section of https://docs.oracle.com/javase/10/security/oracle-providers.htm, add "RSASSA-PSS" into the Signature row.