From 3c04b692de1e7b45b764ff8d66bf84609b012e3a Mon Sep 17 00:00:00 2001
From: Tobias Heider <tobias.heider@canonical.com>
Date: Tue, 27 Sep 2022 13:31:05 +0900
Subject: [PATCH] kdf:pkdf2: Check minimum allowed key size when running in
 FIPS mode.

* cipher/kdf.c (_gcry_kdf_pkdf2): Add output length check.

--

GnuPG-bug-id: 6219
---
 cipher/kdf.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/cipher/kdf.c b/cipher/kdf.c
index 81523320..67c60df8 100644
--- a/cipher/kdf.c
+++ b/cipher/kdf.c
@@ -160,6 +160,10 @@ _gcry_kdf_pkdf2 (const void *passphrase, size_t passphraselen,
     return GPG_ERR_INV_VALUE;
 #endif
 
+  /* Check minimum key size */
+  if (fips_mode () && dklen < 14)
+    return GPG_ERR_INV_VALUE;
+
 
   /* Step 2 */
   l = ((dklen - 1)/ hlen) + 1;
-- 
2.37.3
From e5a5e847b66eb6b80e60a2dffa347268f059aee3 Mon Sep 17 00:00:00 2001
From: Jakub Jelen <jjelen@redhat.com>
Date: Tue, 4 Oct 2022 12:44:54 +0200
Subject: [PATCH] tests: Reproducer for short dklen in FIPS mode

* tests/t-kdf.c (check_pbkdf2): Add test vector with short dklen and
  verify it fails in FIPS mode
--

GnuPG-bug-id: 6219
Signed-off-by: Jakub Jelen <jjelen@redhat.com>
---
 tests/t-kdf.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/tests/t-kdf.c b/tests/t-kdf.c
index c0192d7b..716fb53e 100644
--- a/tests/t-kdf.c
+++ b/tests/t-kdf.c
@@ -909,6 +909,14 @@ check_pbkdf2 (void)
       "\x0c\x60\xc8\x0f\x96\x1f\x0e\x71\xf3\xa9"
       "\xb5\x24\xaf\x60\x12\x06\x2f\xe0\x37\xa6"
     },
+    {
+      "password", 8,
+      "salt", 4,
+      GCRY_MD_SHA1,
+      1,
+      10, /* too short dklen for FIPS */
+      "\x0c\x60\xc8\x0f\x96\x1f\x0e\x71\xf3\xa9"
+    },
     {
       "password", 8,
       "salt", 4,
@@ -1109,7 +1117,7 @@ check_pbkdf2 (void)
                              GCRY_KDF_PBKDF2, tv[tvidx].hashalgo,
                              tv[tvidx].salt, tv[tvidx].saltlen,
                              tv[tvidx].c, tv[tvidx].dklen, outbuf);
-      if (in_fips_mode && tvidx > 6)
+      if (in_fips_mode && tvidx > 7)
         {
           if (!err)
             fail ("pbkdf2 test %d unexpectedly passed in FIPS mode: %s\n",
@@ -1118,7 +1126,7 @@ check_pbkdf2 (void)
         }
       if (err)
         {
-          if (in_fips_mode && tv[tvidx].plen < 14)
+          if (in_fips_mode && (tv[tvidx].plen < 14 || tv[tvidx].dklen < 14))
             {
               if (verbose)
                 fprintf (stderr,
-- 
2.37.3