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+@deftypefun {gnutls_digest_algorithm_t} {gnutls_prf_hash_get} (const gnutls_session_t @var{session})
+@var{session}: is a @code{gnutls_session_t} type.
+
+Get the currently used hash algorithm. In TLS 1.3, the hash
+algorithm is used for both the key derivation function and
+handshake message authentication code. In TLS 1.2, it matches the
+hash algorithm used for PRF.
+
+@strong{Returns:} the currently used hash algorithm, a
+@code{gnutls_digest_algorithm_t} value.
+
+@strong{Since:} 3.6.13
+@end deftypefun