MBEDTLS_ECDSA_H macro

\file ecdsa.h This file contains ECDSA definitions and functions. The Elliptic Curve Digital Signature Algorithm (ECDSA) is defined in Standards for Efficient Cryptography Group (SECG): SEC1 Elliptic Curve Cryptography. The use of ECDSA for TLS is defined in RFC-4492: Elliptic Curve Cryptography (ECC) Cipher Suites for Transport Layer Security (TLS).