rfc9963v1.txt   rfc9963.txt 
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Servers that wish to support clients authenticating with legacy Servers that wish to support clients authenticating with legacy
RSASSA-PKCS1-v1_5-only keys MAY send these values in the RSASSA-PKCS1-v1_5-only keys MAY send these values in the
signature_algorithms extension of the CertificateRequest message and signature_algorithms extension of the CertificateRequest message and
accept them in the client CertificateVerify message. Servers MUST accept them in the client CertificateVerify message. Servers MUST
NOT accept these code points if not offered in the CertificateRequest NOT accept these code points if not offered in the CertificateRequest
message. message.
Clients with such legacy keys MAY negotiate the use of these Clients with such legacy keys MAY negotiate the use of these
signature algorithms if offered by the server. Clients SHOULD NOT signature algorithms if offered by the server. Clients SHOULD NOT
negotiate them with keys that support RSASSA-PSS, though this may not negotiate the use of these signature algorithms with keys that
be practical to determine in all applications. For example, support RSASSA-PSS, though this may not be practical to determine in
attempting to test a key for support might display a message to the all applications. For example, attempting to test a key for support
user or have other side effects. might result in a message to the user or have other side effects.
TLS implementations SHOULD disable these code points by default. See TLS implementations SHOULD disable these code points by default. See
Section 4. Section 4.
4. Security Considerations 4. Security Considerations
The considerations in Section 1 do not apply to server keys, so these The considerations in Section 1 do not apply to server keys, so these
new code points are forbidden for use with server certificates. new code points are forbidden for use with server certificates.
RSASSA-PSS continues to be required for TLS 1.3 servers using RSA RSASSA-PSS continues to be required for TLS 1.3 servers using RSA
keys. This minimizes the impact to only those cases in which it is keys. This minimizes the impact to only those cases in which it is
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