diff --git a/Rakefile b/Rakefile
index f73cc21b7..06a7c1917 100644
--- a/Rakefile
+++ b/Rakefile
@@ -28,7 +28,6 @@ Rake::TestTask.new(:test_fips_internal) do |t|
   t.test_files = FileList['test/**/test_*.rb'] - FileList[
     'test/openssl/test_hmac.rb',
     'test/openssl/test_kdf.rb',
-    'test/openssl/test_pkcs12.rb',
     'test/openssl/test_ts.rb',
   ]
   t.warning = true
diff --git a/test/openssl/test_pkcs12.rb b/test/openssl/test_pkcs12.rb
index 1b5328774..9f9a06cdc 100644
--- a/test/openssl/test_pkcs12.rb
+++ b/test/openssl/test_pkcs12.rb
@@ -5,8 +5,13 @@
 
 module OpenSSL
   class TestPKCS12 < OpenSSL::TestCase
-    DEFAULT_PBE_PKEYS = "PBE-SHA1-3DES"
-    DEFAULT_PBE_CERTS = "PBE-SHA1-3DES"
+    # Use the AES-256-CBC using PBKDF2 which is FIPS-approved, instead of the
+    # PBE-SHA1-3DES using PKCS12KDF which is not FIPS-approved as much as
+    # possible. As the AES-256-CBC is also used as `openssl pkcs12`'s default
+    # algorithm, the case is typical. See also the man page openssl-pkcs12(1).
+    # OpenSSL::PKCS12.create raises UNKNOWN_ALGORITHM in AWS-LC with AES-256-CBC.
+    DEFAULT_PBE_PKEYS = aws_lc? ? "PBE-SHA1-3DES" : "AES-256-CBC"
+    DEFAULT_PBE_CERTS = aws_lc? ? "PBE-SHA1-3DES" : "AES-256-CBC"
 
     def setup
       super
@@ -34,6 +39,11 @@ def setup
     end
 
     def test_create_single_key_single_cert
+      # OpenSSL::PKCS12.create calling the PKCS12_create() has the argument
+      # mac_iter which uses a MAC key using PKCS12KDF which is not
+      # FIPS-approved.
+      omit_on_fips
+
       pkcs12 = OpenSSL::PKCS12.create(
         "omg",
         "hello",
@@ -55,8 +65,14 @@ def test_create_single_key_single_cert
     end
 
     def test_create_no_pass
+      # PKCS12KDF used for a MAC key is not FIPS-approved.
+      omit_on_fips
+
+      # LibreSSL doesn't accept the nil as no pass.
+      pass = libressl? ? "" : nil
+
       pkcs12 = OpenSSL::PKCS12.create(
-        nil,
+        pass,
         "hello",
         @mykey,
         @mycert,
@@ -73,6 +89,9 @@ def test_create_no_pass
     end
 
     def test_create_with_chain
+      # PKCS12KDF used for a MAC key is not FIPS-approved.
+      omit_on_fips
+
       chain = [@inter_cacert, @cacert]
 
       pkcs12 = OpenSSL::PKCS12.create(
@@ -88,6 +107,9 @@ def test_create_with_chain
     end
 
     def test_create_with_chain_decode
+      # PKCS12KDF used for a MAC key is not FIPS-approved.
+      omit_on_fips
+
       chain = [@cacert, @inter_cacert]
 
       passwd = "omg"
@@ -124,6 +146,9 @@ def test_create_with_bad_nid
     end
 
     def test_create_with_itr
+      # PKCS12KDF used for a MAC key is not FIPS-approved.
+      omit_on_fips
+
       OpenSSL::PKCS12.create(
         "omg",
         "hello",
@@ -150,6 +175,9 @@ def test_create_with_itr
     end
 
     def test_create_with_mac_itr
+      # PKCS12KDF used for a MAC key is not FIPS-approved.
+      omit_on_fips
+
       OpenSSL::PKCS12.create(
         "omg",
         "hello",
@@ -178,6 +206,9 @@ def test_create_with_mac_itr
     end
 
     def test_create_with_keytype
+      # PKCS12KDF used for a MAC key is not FIPS-approved.
+      omit_on_fips
+
       omit "AWS-LC does not support KEY_SIG and KEY_EX" if aws_lc?
 
       OpenSSL::PKCS12.create(
@@ -210,45 +241,47 @@ def test_create_with_keytype
     end
 
     def test_new_with_no_keys
-      # generated with:
-      #   openssl pkcs12 -certpbe PBE-SHA1-3DES -in <@mycert> -nokeys -export
+      # PKCS12KDF used for a MAC key is not FIPS-approved.
+      omit_on_fips
+
+      # Generated with the following steps:
+      #   Print the value of the @mycert such as by `puts @mycert.to_s` and
+      #   save the value as the file `mycert.pem`.
+      #   Run the following commands:
+      #   openssl pkcs12 -certpbe AES-256-CBC -in <(cat mycert.pem) \
+      #     -nokeys -export -passout pass:abc123 -out /tmp/p12.out
+      #   base64 /tmp/p12.out
       str = <<~EOF.unpack1("m")
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       EOF
       p12 = OpenSSL::PKCS12.new(str, "abc123")
 
@@ -259,66 +292,61 @@ def test_new_with_no_keys
     end
 
     def test_new_with_no_certs
-      # generated with:
-      #   openssl pkcs12 -inkey fixtures/openssl/pkey/rsa-1.pem -nocerts -export
+      # PKCS12KDF used for a MAC key is not FIPS-approved.
+      omit_on_fips
+
+      # Generated with the folowing steps:
+      #   openssl pkcs12 -inkey test/openssl/fixtures/pkey/rsa-1.pem \
+      #     -nocerts -export -passout pass:abc123 -out /tmp/p12.out
+      #   base64 /tmp/p12.out
       str = <<~EOF.unpack1("m")
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       EOF
       p12 = OpenSSL::PKCS12.new(str, "abc123")
 
@@ -328,6 +356,9 @@ def test_new_with_no_certs
     end
 
     def test_dup
+      # PKCS12KDF used for a MAC key is not FIPS-approved.
+      omit_on_fips
+
       p12 = OpenSSL::PKCS12.create(
         "pass",
         "name",
@@ -341,6 +372,10 @@ def test_dup
     end
 
     def test_set_mac_pkcs12kdf
+      # OpenSSL::PKCS12.create's argument mac_iter uses MAC key using PKCS12KDF
+      # which is not FIPS-approved.
+      omit_on_fips
+
       p12 = OpenSSL::PKCS12.create(
         "pass",
         "name",