Test now has an array of hashes.
Use only first hash when testing full digest operation.

Variables may not be initialized in benchmark test when building for
small stack.

Set the curve explicitly if it is SM2.
Set the key type to signature algorithm to handle SM2.

Pass around the algorithm id from the private key so that the WOLFSSL or
WOLFSSL_CTX get the correct key format set.
Use different verification context when self-signed certificate with SM2
and SM3 signature but public key OID is ECC.