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.
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
crypto/cipher-gcrypt.c.inc | 5 +++++
1 file changed, 5 insertions(+)
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: