doc here

https://developer.4d.com/docs/en/API/CryptoKeyClass.html

CryptoKey was added in v18 R4
it's a class, you need to be in project mode
it's a generic crypto tool but designed specifically for JWT tokens

in other words, the hash function is not a standalone feature;
you can not hash any arbitrary data, you can only hash a CryptoKey instance 

supported encryption algorithms: 

ES256, ES384 and ES512 (ECDSA)
RS256, RS384, RS512 (RSA)
PS256, PS384 (PEM)

supported digest algorithms: 

SHA256, SHA384, SHA512

notice HS@is not supported.

---

for hash there is Generate digest but again, no HMAC

https://doc.4d.com/4Dv17/4D/17.5/Generate-digest.301-5255934.en.html
 

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