This library provides bindings to the EVP_Digest functionality of OpenSSL, which enables cryptographic hash functions to be used in Janet code.

The package can be installed via the jpm utility, given that OpenSSL 1.1 or higher is installed (including headers, so use the -dev/-devel package if available).

There are three functions:

(openssl-hash/new algorithm-name) Returns a new hasher instance with the given algorithm, or returns an error if the algorithm name is invalid. A list of algorithm names available on your system may be found using the command openssl list -digest-algorithms.

(openssl-hash/feed hasher & data) Hashes data in sequential order. Data may be composed of any object that can be turned into a byte view, including strings and buffers.

(openssl-hash/finalize hasher &opt flag) Returns the hash value of the hasher as a binary string. Once a hasher object has had finalize called on it MUST NOT be used again. Passing the value :hex as the flag argument will cause the result to be converted to hexadecimal ASCII.

(def my-hasher (openssl-hash/new "SHA256"))
(openssl-hash/feed my-hasher "hello world")
(print (openssl-hash/finalize my-hasher :hex))