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authorDaniel P. Berrange <berrange@redhat.com>2015-10-16 16:36:53 +0100
committerDaniel P. Berrange <berrange@redhat.com>2015-10-22 19:03:07 +0100
commit91bfcdb01d4869aa8f4cb67007827de63b8c2217 (patch)
treed27c0a6577766db772348b5b023376d9e445483d /crypto/init.c
parentca3e40e233e87f7b29442311736a82da01c0df7b (diff)
crypto: allow use of nettle/gcrypt to be selected explicitly
Currently the choice of whether to use nettle or gcrypt is made based on what gnutls is linked to. There are times when it is desirable to be able to force build against a specific library. For example, if testing changes to QEMU's crypto code all 3 possible backends need to be checked regardless of what the local gnutls uses. It is also desirable to be able to enable nettle/gcrypt for cipher/hash algorithms, without enabling gnutls for TLS support. This gives two new configure flags, which allow the following possibilities Automatically determine nettle vs gcrypt from what gnutls links to (recommended to minimize number of crypto libraries linked to) ./configure Automatically determine nettle vs gcrypt based on which is installed ./configure --disable-gnutls Force use of nettle ./configure --enable-nettle Force use of gcrypt ./configure --enable-gcrypt Force use of built-in AES & crippled-DES ./configure --disable-nettle --disable-gcrypt Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Diffstat (limited to 'crypto/init.c')
-rw-r--r--crypto/init.c26
1 files changed, 12 insertions, 14 deletions
diff --git a/crypto/init.c b/crypto/init.c
index 7447882c7b..d94faacdf2 100644
--- a/crypto/init.c
+++ b/crypto/init.c
@@ -24,8 +24,9 @@
#ifdef CONFIG_GNUTLS
#include <gnutls/gnutls.h>
#include <gnutls/crypto.h>
+#endif
-#ifdef CONFIG_GNUTLS_GCRYPT
+#ifdef CONFIG_GCRYPT
#include <gcrypt.h>
#endif
@@ -37,6 +38,7 @@
* - When GNUTLS >= 2.12, we must not initialize gcrypt threading
* because GNUTLS will do that itself
* - When GNUTLS < 2.12 we must always initialize gcrypt threading
+ * - When GNUTLS is disabled we must always initialize gcrypt threading
*
* But....
*
@@ -47,12 +49,15 @@
*
* - gcrypt < 1.6.0
* AND
- * - gnutls < 2.12
+ * - gnutls < 2.12
+ * OR
+ * - gnutls is disabled
*
*/
-#if (defined(CONFIG_GNUTLS_GCRYPT) && \
- (!defined(GNUTLS_VERSION_NUMBER) || \
+#if (defined(CONFIG_GCRYPT) && \
+ (!defined(CONFIG_GNUTLS) || \
+ !defined(GNUTLS_VERSION_NUMBER) || \
(GNUTLS_VERSION_NUMBER < 0x020c00)) && \
(!defined(GCRYPT_VERSION_NUMBER) || \
(GCRYPT_VERSION_NUMBER < 0x010600)))
@@ -113,6 +118,7 @@ static struct gcry_thread_cbs qcrypto_gcrypt_thread_impl = {
int qcrypto_init(Error **errp)
{
+#ifdef CONFIG_GNUTLS
int ret;
ret = gnutls_global_init();
if (ret < 0) {
@@ -125,8 +131,9 @@ int qcrypto_init(Error **errp)
gnutls_global_set_log_level(10);
gnutls_global_set_log_function(qcrypto_gnutls_log);
#endif
+#endif
-#ifdef CONFIG_GNUTLS_GCRYPT
+#ifdef CONFIG_GCRYPT
if (!gcry_check_version(GCRYPT_VERSION)) {
error_setg(errp, "Unable to initialize gcrypt");
return -1;
@@ -139,12 +146,3 @@ int qcrypto_init(Error **errp)
return 0;
}
-
-#else /* ! CONFIG_GNUTLS */
-
-int qcrypto_init(Error **errp G_GNUC_UNUSED)
-{
- return 0;
-}
-
-#endif /* ! CONFIG_GNUTLS */