crypto/tls: add support for NIST curve based ML‑KEM hybrids

// This program runs in Go 1.27.1 and shows that the new hybrid groups
// (SecP256r1MLKEM768 and SecP384r1MLKEM1024) are not yet available
// in the standard library.  The list of cipher suites is printed
// to illustrate the current capabilities.

package main

import (
	"crypto/tls"
	"fmt"
)

func main() {
	// Retrieve the list of cipher suites that crypto/tls currently supports.
	suites := tls.CipherSuites()

	// Print the names of the supported cipher suites.
	fmt.Println("Supported TLS cipher suites:")
	for _, s := range suites {
		fmt.Println("-", s.Name)
	}

	// Check whether the proposed hybrid groups are present.
	hasSecP256r1MLKEM768 := false
	hasSecP384r1MLKEM1024 := false
	for _, s := range suites {
		if s.Name == "SecP256r1MLKEM768" {
			hasSecP256r1MLKEM768 = true
		}
		if s.Name == "SecP384r1MLKEM1024" {
			hasSecP384r1MLKEM1024 = true
		}
	}

	fmt.Printf("\nSecP256r1MLKEM768 present: %v\n", hasSecP256r1MLKEM768)
	fmt.Printf("SecP384r1MLKEM1024 present: %v\n", hasSecP384r1MLKEM1024)
}