Limit the output of the enc -ciphers command to just the ciphers enc can

process.  This means no AEAD ciphers and no XTS mode.

Update the test script that uses this output to test cipher suites to not
filter out the now missing cipher modes.
Reviewed-by: NRichard Levitte <levitte@openssl.org>
Reviewed-by: NRich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2876)

apps/enc.c

@@ -563,10 +563,18 @@ static void show_ciphers(const OBJ_NAME *name, void *bio_)
 {
     BIO *bio = bio_;
     static int n;
+    const EVP_CIPHER *cipher;
 
     if (!islower((unsigned char)*name->name))
         return;
 
+    /* Filter out ciphers that we cannot use */
+    cipher = EVP_get_cipherbyname(name->name);
+    if (cipher == NULL ||
+            (EVP_CIPHER_flags(cipher) & EVP_CIPH_FLAG_AEAD_CIPHER) != 0 ||
+            EVP_CIPHER_mode(cipher) == EVP_CIPH_XTS_MODE)
+        return;
+
     BIO_printf(bio, "-%-25s", name->name);
     if (++n == 3) {
         BIO_printf(bio, "\n");

test/recipes/20-test_enc_more.t

@@ -29,7 +29,7 @@ my $fail = "";
 my $cmd = "openssl";
 
 my @ciphers =
-    grep(! /wrap|hmac|poly|ocb|xts|^$|^[^-]|(?i)[cg]cm/,
+    grep(! /wrap|^$|^[^-]/,
          (map { split /\s+/ }
               run(app([$cmd, "enc", "-ciphers"]), capture => 1)));