235     let mut out_len = 0;  in hkdf_extract()  localVariable
241             &mut out_len,  in hkdf_extract()
252     if out_len > max_size {  in hkdf_extract()
257     buf.reduce_len(out_len);  in hkdf_extract()
262 pub fn hkdf_expand(out_len: usize, prk: &[u8], info: &[u8]) -> Result<ZVec, Error> {  in hkdf_expand()
263     let mut buf = ZVec::new(out_len)?;  in hkdf_expand()
267         HKDFExpand(buf.as_mut_ptr(), out_len, prk.as_ptr(), prk.len(), info.as_ptr(), info.len())  in hkdf_expand()
335     let out_len = result.try_into().unwrap();  in ecdh_compute_key()  localVariable
337     if out_len > buf.len() {  in ecdh_compute_key()
342     buf.reduce_len(out_len);  in ecdh_compute_key()
546         for out_len in 4..=8 {  in test_hkdf()
547             let result = hkdf_expand(out_len, &[0; 16], &[0; 16]);  in test_hkdf()
549             assert_eq!(result.unwrap().len(), out_len);  in test_hkdf()