const crypto/tls.TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305

one use

	crypto/tls (current package)
		cipher_suites.go#L723: 	TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305 = TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256