EVP_PKEY_assign_EC_KEY(): detect SM2 curve and set EVP_PKEY type accordingly
This means that when loaded or created, EC EVP_PKEYs with the SM2 curve will be regarded as EVP_PKEY_SM2 type keys by default. Applications are no longer forced to check and fix this. It's still possible, for those who want this, to set the key type to EVP_PKEY_EC and thereby run the normal EC computations with the SM2 curve. This has to be done explicitly. Reviewed-by: NMatt Caswell <matt@openssl.org> Reviewed-by: NDmitry Belyavskiy <beldmit@gmail.com> (Merged from https://github.com/openssl/openssl/pull/10942)
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