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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 16:09:41 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 16:09:41 +0000
commit3271d1ac389d2ec93db9c5b9ce0991ce478476cf (patch)
tree35ff7d180e1ccc061f28535d7435b5ba1789e734 /cmac_nettle.c
parentInitial commit. (diff)
downloadchrony-3271d1ac389d2ec93db9c5b9ce0991ce478476cf.tar.xz
chrony-3271d1ac389d2ec93db9c5b9ce0991ce478476cf.zip
Adding upstream version 4.3.upstream/4.3upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'cmac_nettle.c')
-rw-r--r--cmac_nettle.c117
1 files changed, 117 insertions, 0 deletions
diff --git a/cmac_nettle.c b/cmac_nettle.c
new file mode 100644
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+++ b/cmac_nettle.c
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+/*
+ chronyd/chronyc - Programs for keeping computer clocks accurate.
+
+ **********************************************************************
+ * Copyright (C) Miroslav Lichvar 2019
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program 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
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ **********************************************************************
+
+ =======================================================================
+
+ Support for AES128 and AES256 CMAC in Nettle.
+
+ */
+
+#include "config.h"
+
+#include "sysincl.h"
+
+#include <nettle/cmac.h>
+
+#include "cmac.h"
+#include "memory.h"
+
+struct CMC_Instance_Record {
+ int key_length;
+ union {
+ struct cmac_aes128_ctx aes128;
+ struct cmac_aes256_ctx aes256;
+ } context;
+};
+
+/* ================================================== */
+
+int
+CMC_GetKeyLength(CMC_Algorithm algorithm)
+{
+ if (algorithm == CMC_AES128)
+ return AES128_KEY_SIZE;
+ else if (algorithm == CMC_AES256)
+ return AES256_KEY_SIZE;
+ return 0;
+}
+
+/* ================================================== */
+
+CMC_Instance
+CMC_CreateInstance(CMC_Algorithm algorithm, const unsigned char *key, int length)
+{
+ CMC_Instance inst;
+
+ if (length <= 0 || length != CMC_GetKeyLength(algorithm))
+ return NULL;
+
+ inst = MallocNew(struct CMC_Instance_Record);
+ inst->key_length = length;
+
+ switch (length) {
+ case AES128_KEY_SIZE:
+ cmac_aes128_set_key(&inst->context.aes128, key);
+ break;
+ case AES256_KEY_SIZE:
+ cmac_aes256_set_key(&inst->context.aes256, key);
+ break;
+ default:
+ assert(0);
+ }
+
+ return inst;
+}
+
+/* ================================================== */
+
+int
+CMC_Hash(CMC_Instance inst, const void *in, int in_len, unsigned char *out, int out_len)
+{
+ if (in_len < 0 || out_len < 0)
+ return 0;
+
+ if (out_len > CMAC128_DIGEST_SIZE)
+ out_len = CMAC128_DIGEST_SIZE;
+
+ switch (inst->key_length) {
+ case AES128_KEY_SIZE:
+ cmac_aes128_update(&inst->context.aes128, in_len, in);
+ cmac_aes128_digest(&inst->context.aes128, out_len, out);
+ break;
+ case AES256_KEY_SIZE:
+ cmac_aes256_update(&inst->context.aes256, in_len, in);
+ cmac_aes256_digest(&inst->context.aes256, out_len, out);
+ break;
+ default:
+ assert(0);
+ }
+
+ return out_len;
+}
+
+/* ================================================== */
+
+void
+CMC_DestroyInstance(CMC_Instance inst)
+{
+ Free(inst);
+}