RFC 4492 (ECC in TLS) defines 3 methods for client authentication. NSS presently implements only the first one: ECDSA_sign which is most like the client auth method used with RSA certs. This RFE asks for NSS to implement the other two, ECDSA_fixed_ECDH RSA_fixed_ECDH on the server side, so that an NSS server can ask a remote TLS client to authenticate with these methods instead of, or in addition to, the ECDSA_sign.
Note that presently, NSS servers configured to request client auth for ECC will always request the method ECDSA_sign, and all the desktop ECC TLS clients are believed to implement this method.
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