feat(openssl): Complete encryption algos for enc

Also add test to verify

Author: yedayak

completions/openssl

@@ -111,6 +111,11 @@ _comp_cmd_openssl()
                 dgst | req | x509)
                     _comp_compgen -a -i openssl digests "$1"
                     ;;
+                enc)
+                    # The -list option was added in openssl 1.1.1e, so we ignore the error here.
+                    # We do get some of the ciphers "by accident", since some are detected in the help output.
+                    _comp_compgen -a split -- "$("$1" enc -list 2>/dev/null | command sed '/Supported ciphers:/d')"
+                    ;;
             esac
         else
             if [[ $command == speed ]]; then

test/t/test_openssl.py

@@ -15,3 +15,8 @@ def test_2(self, completion):
     def test_3(self, completion):
         assert completion
         assert any(x.startswith("-sha") for x in completion)
+
+    @pytest.mark.complete("openssl enc -a", require_cmd=True)
+    def test_4(self, completion):
+        assert completion
+        assert any(x.startswith("-aes") for x in completion)