Software only equivalents for cryptoauthlib functions ??

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Any pointers or formulas for software only equivalents for cryptoauthlib functions ??

(To be run in cloud/backend interoperating with ATECC508/crytoauthlib in device)

 

For example I have msg digest, pub key and signature from ATECC508:

Msg: 000102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F
Pub: 9E7D267C3921AAA6E346D5165BD55D48CF5E1693016DF7C97988BC28B1B54837C4251E8D3E69D56D868C67F6132B90BED8C1C3CF13D1263775398B188AB9B312
Sig: D6F546B6E447D098E5DEF8B55612A2963682BDF5DC2885A60CF33E6AF4D2F5F617406697FD3F4208A0CAC8D65186992FE643556254FA930F9ECC219FDD85FFA9

 

How do I verify on the backend with no ATECC508 ??

e.g. import binary/hex pub key/sig/msg into openssl compatible formats and verify via openssl cmd line