Hello,
I'm tasked to implement certain cryptographic functions (chiefly
signature creation/validation) using the SM2 algorithm for a
communication testing application. My problem is that the standard which
I need to follow (which is, unfortunately, not a public standard) states
that the signature needs to be generated over H(data input) || H(some
ID) , so I cannot use the EVP-Method as I understand it from
https://www.openssl.org/docs/manmaster/man7/SM2.html (here, H is the SM3
hash function). This would be possible to achieve by generating the
digest and then using the (albeit deprecated) function ECDSA_do_sign for
ECDSA but I don't know how to do it for SM2.
Is there any way to do this with openssl? Any help or pointer is very
much appreciated!
Thank you,
Jörg
--
Jörg Heßdörfer
S.E.A. Datentechnik GmbH
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