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authorDaniel P. Berrange2015-07-01 19:10:33 +0200
committerPaolo Bonzini2015-07-08 13:11:01 +0200
commit62893b67cd82bbd48b013c1cec25f0d863612c80 (patch)
treefdcded03d2afd85f14e082d1264808ac8b0e4abb /crypto
parentcrypto: introduce generic cipher API & built-in implementation (diff)
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crypto: add a gcrypt cipher implementation
If we are linking to gnutls already and gnutls is built against gcrypt, then we should use gcrypt as a cipher backend in preference to our built-in backend. This will be used when linking against GNUTLS 1.x and many GNUTLS 2.x versions. Signed-off-by: Daniel P. Berrange <berrange@redhat.com> Message-Id: <1435770638-25715-6-git-send-email-berrange@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'crypto')
-rw-r--r--crypto/cipher-gcrypt.c195
-rw-r--r--crypto/cipher.c23
-rw-r--r--crypto/init.c90
3 files changed, 308 insertions, 0 deletions
diff --git a/crypto/cipher-gcrypt.c b/crypto/cipher-gcrypt.c
new file mode 100644
index 0000000000..8cfc562500
--- /dev/null
+++ b/crypto/cipher-gcrypt.c
@@ -0,0 +1,195 @@
+/*
+ * QEMU Crypto cipher libgcrypt algorithms
+ *
+ * Copyright (c) 2015 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <gcrypt.h>
+
+
+bool qcrypto_cipher_supports(QCryptoCipherAlgorithm alg)
+{
+ switch (alg) {
+ case QCRYPTO_CIPHER_ALG_DES_RFB:
+ case QCRYPTO_CIPHER_ALG_AES_128:
+ case QCRYPTO_CIPHER_ALG_AES_192:
+ case QCRYPTO_CIPHER_ALG_AES_256:
+ return true;
+ default:
+ return false;
+ }
+}
+
+
+QCryptoCipher *qcrypto_cipher_new(QCryptoCipherAlgorithm alg,
+ QCryptoCipherMode mode,
+ const uint8_t *key, size_t nkey,
+ Error **errp)
+{
+ QCryptoCipher *cipher;
+ gcry_cipher_hd_t handle;
+ gcry_error_t err;
+ int gcryalg, gcrymode;
+
+ switch (mode) {
+ case QCRYPTO_CIPHER_MODE_ECB:
+ gcrymode = GCRY_CIPHER_MODE_ECB;
+ break;
+ case QCRYPTO_CIPHER_MODE_CBC:
+ gcrymode = GCRY_CIPHER_MODE_CBC;
+ break;
+ default:
+ error_setg(errp, "Unsupported cipher mode %d", mode);
+ return NULL;
+ }
+
+ if (!qcrypto_cipher_validate_key_length(alg, nkey, errp)) {
+ return NULL;
+ }
+
+ switch (alg) {
+ case QCRYPTO_CIPHER_ALG_DES_RFB:
+ gcryalg = GCRY_CIPHER_DES;
+ break;
+
+ case QCRYPTO_CIPHER_ALG_AES_128:
+ gcryalg = GCRY_CIPHER_AES128;
+ break;
+
+ case QCRYPTO_CIPHER_ALG_AES_192:
+ gcryalg = GCRY_CIPHER_AES192;
+ break;
+
+ case QCRYPTO_CIPHER_ALG_AES_256:
+ gcryalg = GCRY_CIPHER_AES256;
+ break;
+
+ default:
+ error_setg(errp, "Unsupported cipher algorithm %d", alg);
+ return NULL;
+ }
+
+ cipher = g_new0(QCryptoCipher, 1);
+ cipher->alg = alg;
+ cipher->mode = mode;
+
+ err = gcry_cipher_open(&handle, gcryalg, gcrymode, 0);
+ if (err != 0) {
+ error_setg(errp, "Cannot initialize cipher: %s",
+ gcry_strerror(err));
+ goto error;
+ }
+
+ if (cipher->alg == QCRYPTO_CIPHER_ALG_DES_RFB) {
+ /* We're using standard DES cipher from gcrypt, so we need
+ * to munge the key so that the results are the same as the
+ * bizarre RFB variant of DES :-)
+ */
+ uint8_t *rfbkey = qcrypto_cipher_munge_des_rfb_key(key, nkey);
+ err = gcry_cipher_setkey(handle, rfbkey, nkey);
+ g_free(rfbkey);
+ } else {
+ err = gcry_cipher_setkey(handle, key, nkey);
+ }
+ if (err != 0) {
+ error_setg(errp, "Cannot set key: %s",
+ gcry_strerror(err));
+ goto error;
+ }
+
+ cipher->opaque = handle;
+ return cipher;
+
+ error:
+ gcry_cipher_close(handle);
+ g_free(cipher);
+ return NULL;
+}
+
+
+void qcrypto_cipher_free(QCryptoCipher *cipher)
+{
+ gcry_cipher_hd_t handle;
+ if (!cipher) {
+ return;
+ }
+ handle = cipher->opaque;
+ gcry_cipher_close(handle);
+ g_free(cipher);
+}
+
+
+int qcrypto_cipher_encrypt(QCryptoCipher *cipher,
+ const void *in,
+ void *out,
+ size_t len,
+ Error **errp)
+{
+ gcry_cipher_hd_t handle = cipher->opaque;
+ gcry_error_t err;
+
+ err = gcry_cipher_encrypt(handle,
+ out, len,
+ in, len);
+ if (err != 0) {
+ error_setg(errp, "Cannot encrypt data: %s",
+ gcry_strerror(err));
+ return -1;
+ }
+
+ return 0;
+}
+
+
+int qcrypto_cipher_decrypt(QCryptoCipher *cipher,
+ const void *in,
+ void *out,
+ size_t len,
+ Error **errp)
+{
+ gcry_cipher_hd_t handle = cipher->opaque;
+ gcry_error_t err;
+
+ err = gcry_cipher_decrypt(handle,
+ out, len,
+ in, len);
+ if (err != 0) {
+ error_setg(errp, "Cannot decrypt data: %s",
+ gcry_strerror(err));
+ return -1;
+ }
+
+ return 0;
+}
+
+int qcrypto_cipher_setiv(QCryptoCipher *cipher,
+ const uint8_t *iv, size_t niv,
+ Error **errp)
+{
+ gcry_cipher_hd_t handle = cipher->opaque;
+ gcry_error_t err;
+
+ gcry_cipher_reset(handle);
+ err = gcry_cipher_setiv(handle, iv, niv);
+ if (err != 0) {
+ error_setg(errp, "Cannot set IV: %s",
+ gcry_strerror(err));
+ return -1;
+ }
+
+ return 0;
+}
diff --git a/crypto/cipher.c b/crypto/cipher.c
index 0944827fa1..ed4d854a13 100644
--- a/crypto/cipher.c
+++ b/crypto/cipher.c
@@ -20,6 +20,7 @@
#include "crypto/cipher.h"
+
static size_t alg_key_len[QCRYPTO_CIPHER_ALG_LAST] = {
[QCRYPTO_CIPHER_ALG_AES_128] = 16,
[QCRYPTO_CIPHER_ALG_AES_192] = 24,
@@ -46,4 +47,26 @@ qcrypto_cipher_validate_key_length(QCryptoCipherAlgorithm alg,
return true;
}
+#if defined(CONFIG_GNUTLS_GCRYPT)
+static uint8_t *
+qcrypto_cipher_munge_des_rfb_key(const uint8_t *key,
+ size_t nkey)
+{
+ uint8_t *ret = g_new0(uint8_t, nkey);
+ size_t i;
+ for (i = 0; i < nkey; i++) {
+ uint8_t r = key[i];
+ r = (r & 0xf0) >> 4 | (r & 0x0f) << 4;
+ r = (r & 0xcc) >> 2 | (r & 0x33) << 2;
+ r = (r & 0xaa) >> 1 | (r & 0x55) << 1;
+ ret[i] = r;
+ }
+ return ret;
+}
+#endif /* CONFIG_GNUTLS_GCRYPT */
+
+#ifdef CONFIG_GNUTLS_GCRYPT
+#include "crypto/cipher-gcrypt.c"
+#else
#include "crypto/cipher-builtin.c"
+#endif
diff --git a/crypto/init.c b/crypto/init.c
index 40f3d6e778..7447882c7b 100644
--- a/crypto/init.c
+++ b/crypto/init.c
@@ -19,13 +19,48 @@
*/
#include "crypto/init.h"
+#include "qemu/thread.h"
#ifdef CONFIG_GNUTLS
#include <gnutls/gnutls.h>
#include <gnutls/crypto.h>
+#ifdef CONFIG_GNUTLS_GCRYPT
+#include <gcrypt.h>
+#endif
+
/* #define DEBUG_GNUTLS */
+/*
+ * If GNUTLS is built against GCrypt then
+ *
+ * - 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
+ *
+ * But....
+ *
+ * When gcrypt >= 1.6.0 we must not initialize gcrypt threading
+ * because gcrypt will do that itself.
+ *
+ * So we need to init gcrypt threading if
+ *
+ * - gcrypt < 1.6.0
+ * AND
+ * - gnutls < 2.12
+ *
+ */
+
+#if (defined(CONFIG_GNUTLS_GCRYPT) && \
+ (!defined(GNUTLS_VERSION_NUMBER) || \
+ (GNUTLS_VERSION_NUMBER < 0x020c00)) && \
+ (!defined(GCRYPT_VERSION_NUMBER) || \
+ (GCRYPT_VERSION_NUMBER < 0x010600)))
+#define QCRYPTO_INIT_GCRYPT_THREADS
+#else
+#undef QCRYPTO_INIT_GCRYPT_THREADS
+#endif
+
#ifdef DEBUG_GNUTLS
static void qcrypto_gnutls_log(int level, const char *str)
{
@@ -33,6 +68,49 @@ static void qcrypto_gnutls_log(int level, const char *str)
}
#endif
+#ifdef QCRYPTO_INIT_GCRYPT_THREADS
+static int qcrypto_gcrypt_mutex_init(void **priv)
+{ \
+ QemuMutex *lock = NULL;
+ lock = g_new0(QemuMutex, 1);
+ qemu_mutex_init(lock);
+ *priv = lock;
+ return 0;
+}
+
+static int qcrypto_gcrypt_mutex_destroy(void **priv)
+{
+ QemuMutex *lock = *priv;
+ qemu_mutex_destroy(lock);
+ g_free(lock);
+ return 0;
+}
+
+static int qcrypto_gcrypt_mutex_lock(void **priv)
+{
+ QemuMutex *lock = *priv;
+ qemu_mutex_lock(lock);
+ return 0;
+}
+
+static int qcrypto_gcrypt_mutex_unlock(void **priv)
+{
+ QemuMutex *lock = *priv;
+ qemu_mutex_unlock(lock);
+ return 0;
+}
+
+static struct gcry_thread_cbs qcrypto_gcrypt_thread_impl = {
+ (GCRY_THREAD_OPTION_PTHREAD | (GCRY_THREAD_OPTION_VERSION << 8)),
+ NULL,
+ qcrypto_gcrypt_mutex_init,
+ qcrypto_gcrypt_mutex_destroy,
+ qcrypto_gcrypt_mutex_lock,
+ qcrypto_gcrypt_mutex_unlock,
+ NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL
+};
+#endif /* QCRYPTO_INIT_GCRYPT */
+
int qcrypto_init(Error **errp)
{
int ret;
@@ -47,6 +125,18 @@ int qcrypto_init(Error **errp)
gnutls_global_set_log_level(10);
gnutls_global_set_log_function(qcrypto_gnutls_log);
#endif
+
+#ifdef CONFIG_GNUTLS_GCRYPT
+ if (!gcry_check_version(GCRYPT_VERSION)) {
+ error_setg(errp, "Unable to initialize gcrypt");
+ return -1;
+ }
+#ifdef QCRYPTO_INIT_GCRYPT_THREADS
+ gcry_control(GCRYCTL_SET_THREAD_CBS, &qcrypto_gcrypt_thread_impl);
+#endif /* QCRYPTO_INIT_GCRYPT_THREADS */
+ gcry_control(GCRYCTL_INITIALIZATION_FINISHED, 0);
+#endif
+
return 0;
}