From: Daniel P. Berrangé <berrange@redhat.com>
Date: Mon, 11 Mar 2024 12:09:25 +0000 (+0000)
Subject: crypto: query gcrypt for cipher availability
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=e503fc55acffccac5d2755633e7a48262e8edd9b;p=qemu.git

crypto: query gcrypt for cipher availability

Just because a cipher is defined in the gcrypt header file, does not
imply that it can be used. Distros can filter the list of ciphers when
building gcrypt. For example, RHEL-9 disables the SM4 cipher. It is
also possible that running in FIPS mode might dynamically change what
ciphers are available at runtime.

qcrypto_cipher_supports must therefore query gcrypt directly to check
for cipher availability.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---

diff --git a/crypto/cipher-gcrypt.c.inc b/crypto/cipher-gcrypt.c.inc
index 6b82280f90..4a8314746d 100644
--- a/crypto/cipher-gcrypt.c.inc
+++ b/crypto/cipher-gcrypt.c.inc
@@ -93,6 +93,11 @@ bool qcrypto_cipher_supports(QCryptoCipherAlgorithm alg,
         return false;
     }
 
+    if (gcry_cipher_algo_info(qcrypto_cipher_alg_to_gcry_alg(alg),
+                              GCRYCTL_TEST_ALGO, NULL, NULL) != 0) {
+        return false;
+    }
+
     switch (mode) {
     case QCRYPTO_CIPHER_MODE_ECB:
     case QCRYPTO_CIPHER_MODE_CBC: