The commit adds support for RFC 8998 and draft-yang-tls-hybrid-sm2-mlkem. This includes support for the TLS_SM4_GCM_SM3 and TLS_SM4_CCM_SM3 cipher suites, the key exchange groups curveSM2 and curveSM2MLKEM768, and SM2 public keys and signatures.
While this commit adds support to tls_sockets() to decrypt server responses encrypted under SM4 GCM or CCM, OpenSSL does not support performing key derivation using curveSM2. So, tls_sockets() can not decrypt server responses if the key exchange was performed using curveSM2 or curveSM2MLKEM768.
This commit adds support for the three code points in draft-kwiatkowski-tls-ecdhe-mlkem and the code point 0x6399 from draft-tls-westerbaan-xyber768d00. The group 0x6399 uses a pre-standard version of Kyber and is considered obsolete.
The file etc/curves-mapping.txt currently has CRLF line endings and this seems to cause problems with git since .gitattributes now specifies LF line endings for .txt files. This commit changes the line endings for the file in order to (hopefully) prevent problems with git.
