public inbox for devel@edk2.groups.io
 help / color / mirror / Atom feed
From: "PierreGondois" <pierre.gondois@arm.com>
To: devel@edk2.groups.io
Cc: Michael D Kinney <michael.d.kinney@intel.com>,
	Liming Gao <gaoliming@byosoft.com.cn>,
	Zhiguang Liu <zhiguang.liu@intel.com>,
	Jiewen Yao <jiewen.yao@intel.com>,
	Jian J Wang <jian.j.wang@intel.com>,
	Ard Biesheuvel <ardb+tianocore@kernel.org>,
	Sami Mujawar <sami.mujawar@arm.com>,
	Jose Marinho <Jose.Marinho@arm.com>, Kun Qin <kuqin12@gmail.com>
Subject: [edk2-devel] [PATCH v5 4/9] MdePkg/DxeRngLib: Request raw algorithm instead of default
Date: Tue, 18 Jul 2023 13:51:51 +0200	[thread overview]
Message-ID: <20230718115156.1224842-5-pierre.gondois@arm.com> (raw)
In-Reply-To: <20230718115156.1224842-1-pierre.gondois@arm.com>

From: Pierre Gondois <pierre.gondois@arm.com>

The DxeRngLib tries to generate a random number using the 3 NIST
SP 800-90 compliant DRBG algorithms, i.e. 256-bits CTR, HASH and HMAC.
If none of the call is successful, the fallback option is the default
RNG algorithm of the EFI_RNG_PROTOCOL. This default algorithm might
be an unsafe implementation.

Try requesting the Raw algorithm before requesting the default one.

Signed-off-by: Pierre Gondois <pierre.gondois@arm.com>
Reviewed-by: Sami Mujawar <sami.mujawar@arm.com>
---
 MdePkg/Library/DxeRngLib/DxeRngLib.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/MdePkg/Library/DxeRngLib/DxeRngLib.c b/MdePkg/Library/DxeRngLib/DxeRngLib.c
index 46aea515924f..a01b66ad7d20 100644
--- a/MdePkg/Library/DxeRngLib/DxeRngLib.c
+++ b/MdePkg/Library/DxeRngLib/DxeRngLib.c
@@ -65,9 +65,15 @@ GenerateRandomNumberViaNist800Algorithm (
     return Status;
   }
 
+  Status = RngProtocol->GetRNG (RngProtocol, &gEfiRngAlgorithmRaw, BufferSize, Buffer);
+  DEBUG ((DEBUG_INFO, "%a: GetRNG algorithm Raw - Status = %r\n", __func__, Status));
+  if (!EFI_ERROR (Status)) {
+    return Status;
+  }
+
   // If all the other methods have failed, use the default method from the RngProtocol
   Status = RngProtocol->GetRNG (RngProtocol, NULL, BufferSize, Buffer);
-  DEBUG ((DEBUG_INFO, "%a: GetRNG algorithm Hash-256 - Status = %r\n", __func__, Status));
+  DEBUG ((DEBUG_INFO, "%a: GetRNG algorithm default - Status = %r\n", __func__, Status));
   if (!EFI_ERROR (Status)) {
     return Status;
   }
-- 
2.25.1



-=-=-=-=-=-=-=-=-=-=-=-
Groups.io Links: You receive all messages sent to this group.
View/Reply Online (#107011): https://edk2.groups.io/g/devel/message/107011
Mute This Topic: https://groups.io/mt/100213731/7686176
Group Owner: devel+owner@edk2.groups.io
Unsubscribe: https://edk2.groups.io/g/devel/unsub [rebecca@openfw.io]
-=-=-=-=-=-=-=-=-=-=-=-



  parent reply	other threads:[~2023-07-18 11:52 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-07-18 11:51 [edk2-devel] [PATCH v5 0/9] SecurityPkg/MdePkg: Update RngLib GUID identification PierreGondois
2023-07-18 11:51 ` [edk2-devel] [PATCH v5 1/9] MdeModulePkg: Duplicate BaseRngLibTimerLib to MdeModulePkg PierreGondois
2023-08-07  5:09   ` Sami Mujawar
2023-07-18 11:51 ` [edk2-devel] [PATCH v5 2/9] MdePkg: Add deprecated warning to BaseRngLibTimer PierreGondois
2023-08-07  5:12   ` Sami Mujawar
2023-07-18 11:51 ` [edk2-devel] [PATCH v5 3/9] SecurityPkg/SecurityPkg.dec: Move PcdCpuRngSupportedAlgorithm to MdePkg PierreGondois
2023-07-18 11:51 ` PierreGondois [this message]
2023-07-18 11:51 ` [edk2-devel] [PATCH v5 5/9] MdePkg/Rng: Add GUID to describe Arm Rndr Rng algorithms PierreGondois
2023-07-18 11:51 ` [edk2-devel] [PATCH v5 6/9] MdeModulePkg/Rng: Add GUID to describe unsafe " PierreGondois
2023-08-07  5:13   ` Sami Mujawar
2023-07-18 11:51 ` [edk2-devel] [PATCH v5 7/9] MdePkg/Rng: Add GetRngGuid() to RngLib PierreGondois
2023-07-18 11:51 ` [edk2-devel] [PATCH v5 8/9] SecurityPkg/RngDxe: Use GetRngGuid() when probing RngLib PierreGondois
2023-08-07  5:16   ` Sami Mujawar
2023-08-10 13:19     ` PierreGondois
2023-08-10 18:37       ` Sami Mujawar
2023-07-18 11:51 ` [edk2-devel] [PATCH v5 9/9] SecurityPkg/RngDxe: Simplify Rng algorithm selection for Arm PierreGondois
2023-07-19  5:15 ` 回复: [edk2-devel] [PATCH v5 0/9] SecurityPkg/MdePkg: Update RngLib GUID identification gaoliming via groups.io
2023-07-20 18:03 ` Kun Qin

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-list from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20230718115156.1224842-5-pierre.gondois@arm.com \
    --to=devel@edk2.groups.io \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox