Man pages matching name tspi_hash_verifysignature in section 3:

Tspi_Hash_VerifySignature.3.en	debian 10 / libtspi-dev
Tspi_Hash_VerifySignature.3.en	debian 11 / libtspi-dev
Tspi_Hash_VerifySignature.3.en	debian 12 / libtspi-dev