The TTLSSignatureAlgorithmsExtension class represents the signature algorithms extension to indicate to the TLS server which signature schemes may be used in digital signatures.
TTLSSignatureAlgorithmsExtension contains a list of signature schemes that the client is willing to verify. The values are indicated in descending order of preference.
Note: this extension is not meaningful for TLS versions prior to 1.2.
This extension is described in RFC 5246, section 220.127.116.11.1.