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crypto: query gcrypt for cipher availability

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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>
This commit is contained in:
Daniel P. Berrangé
2024-03-11 12:09:25 +00:00
parent eac57306d8
commit e503fc55ac
1 changed files with 5 additions and 0 deletions
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5
crypto/cipher-gcrypt.c.inc
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@ -93,6 +93,11 @@ bool qcrypto_cipher_supports(QCryptoCipherAlgorithm alg,
return false; return false;
} }
if (gcry_cipher_algo_info(qcrypto_cipher_alg_to_gcry_alg(alg),
GCRYCTL_TEST_ALGO, NULL, NULL) != 0) {
return false;
}
switch (mode) { switch (mode) {
case QCRYPTO_CIPHER_MODE_ECB: case QCRYPTO_CIPHER_MODE_ECB:
case QCRYPTO_CIPHER_MODE_CBC: case QCRYPTO_CIPHER_MODE_CBC: