Add tests for secure-hash and improve doc string (Bug#37420)

* src/fns.c (Fsecure_hash_algorithms): Fix typo.
(Fsecure_hash): Add algorithm list to doc string.
* test/src/fns-tests.el (test-secure-hash): New test.

src/fns.c

@@ -5081,7 +5081,7 @@ make_digest_string (Lisp_Object digest, int digest_size)
 
 DEFUN ("secure-hash-algorithms", Fsecure_hash_algorithms,
        Ssecure_hash_algorithms, 0, 0, 0,
-       doc: /* Return a list of all the supported `secure_hash' algorithms. */)
+       doc: /* Return a list of all the supported `secure-hash' algorithms. */)
   (void)
 {
   return list (Qmd5, Qsha1, Qsha224, Qsha256, Qsha384, Qsha512);
@@ -5388,7 +5388,12 @@ anything security-related.  See `secure-hash' for alternatives.  */)
 DEFUN ("secure-hash", Fsecure_hash, Ssecure_hash, 2, 5, 0,
        doc: /* Return the secure hash of OBJECT, a buffer or string.
 ALGORITHM is a symbol specifying the hash to use:
-md5, sha1, sha224, sha256, sha384 or sha512.
+- md5    corresponds to MD5
+- sha1   corresponds to SHA-1
+- sha224 corresponds to SHA-2 (SHA-224)
+- sha256 corresponds to SHA-2 (SHA-256)
+- sha384 corresponds to SHA-2 (SHA-384)
+- sha512 corresponds to SHA-2 (SHA-512)
 
 The two optional arguments START and END are positions specifying for
 which part of OBJECT to compute the hash.  If nil or omitted, uses the

test/src/fns-tests.el

@@ -858,4 +858,22 @@
        (puthash k k h)))
     (should (= 100 (hash-table-count h)))))
 
+(ert-deftest test-secure-hash ()
+  (should (equal (secure-hash 'md5    "foobar")
+                 "3858f62230ac3c915f300c664312c63f"))
+  (should (equal (secure-hash 'sha1   "foobar")
+                 "8843d7f92416211de9ebb963ff4ce28125932878"))
+  (should (equal (secure-hash 'sha224 "foobar")
+                 "de76c3e567fca9d246f5f8d3b2e704a38c3c5e258988ab525f941db8"))
+  (should (equal (secure-hash 'sha256 "foobar")
+                 (concat "c3ab8ff13720e8ad9047dd39466b3c89"
+                         "74e592c2fa383d4a3960714caef0c4f2")))
+  (should (equal (secure-hash 'sha384 "foobar")
+                 (concat "3c9c30d9f665e74d515c842960d4a451c83a0125fd3de739"
+                         "2d7b37231af10c72ea58aedfcdf89a5765bf902af93ecf06")))
+  (should (equal (secure-hash 'sha512 "foobar")
+                 (concat "0a50261ebd1a390fed2bf326f2673c145582a6342d5"
+                         "23204973d0219337f81616a8069b012587cf5635f69"
+                         "25f1b56c360230c19b273500ee013e030601bf2425"))))
+
 (provide 'fns-tests)