From 42ca44984b140fe00da032b37349081aa8048b1f Mon Sep 17 00:00:00 2001
From: Owen Kirby <osk@exegin.com>
Date: Sun, 23 Mar 2014 14:10:12 +0100
Subject: CCM cipher mode.

---
 ccm-aes128.c | 106 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 106 insertions(+)
 create mode 100644 ccm-aes128.c

(limited to 'ccm-aes128.c')

diff --git a/ccm-aes128.c b/ccm-aes128.c
new file mode 100644
index 00000000..903ff41d
--- /dev/null
+++ b/ccm-aes128.c
@@ -0,0 +1,106 @@
+/* ccm-aes128.c
+ *
+ * Counter with CBC-MAC mode using AES128 as the underlying cipher.
+ */
+
+/* nettle, low-level cryptographics library
+ *
+ * Copyright (C) 2014 Exegin Technologies Limited
+ * Copyright (C) 2014 Owen Kirby
+ *
+ * The nettle 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 2.1 of the License, or (at your
+ * option) any later version.
+ * 
+ * The nettle 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 the nettle library; see the file COPYING.LIB.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02111-1301, USA.
+ */
+
+#if HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <assert.h>
+
+#include "aes.h"
+#include "ccm.h"
+
+void
+ccm_aes128_set_key(struct ccm_aes128_ctx *ctx, const uint8_t *key)
+{
+  aes128_set_encrypt_key(&ctx->cipher, key);
+}
+
+void
+ccm_aes128_set_nonce(struct ccm_aes128_ctx *ctx,
+		     size_t length, const uint8_t *nonce,
+		     size_t authlen, size_t msglen, size_t taglen)
+{
+  ccm_set_nonce(&ctx->ccm, &ctx->cipher, (nettle_cipher_func *) aes128_encrypt,
+		length, nonce, authlen, msglen, taglen);
+}
+
+void
+ccm_aes128_update(struct ccm_aes128_ctx *ctx,
+		  size_t length, const uint8_t *data)
+{
+  ccm_update(&ctx->ccm, &ctx->cipher, (nettle_cipher_func *) aes128_encrypt,
+	     length, data);
+}
+
+void
+ccm_aes128_encrypt(struct ccm_aes128_ctx *ctx,
+		   size_t length, uint8_t *dst, const uint8_t *src)
+{
+  ccm_encrypt(&ctx->ccm, &ctx->cipher, (nettle_cipher_func *) aes128_encrypt,
+	      length, dst, src);
+}
+
+void
+ccm_aes128_decrypt(struct ccm_aes128_ctx *ctx,
+		   size_t length, uint8_t *dst, const uint8_t *src)
+{
+  ccm_decrypt(&ctx->ccm, &ctx->cipher, (nettle_cipher_func *) aes128_encrypt,
+	      length, dst, src);
+}
+
+void
+ccm_aes128_digest(struct ccm_aes128_ctx *ctx,
+		  size_t length, uint8_t *digest)
+{
+  ccm_digest(&ctx->ccm, &ctx->cipher, (nettle_cipher_func *) aes128_encrypt,
+	     length, digest);
+}
+
+void
+ccm_aes128_encrypt_message(struct ccm_aes128_ctx *ctx,
+			   size_t nlength, const uint8_t *nonce,
+			   size_t alength, const uint8_t *adata,
+			   size_t tlength,
+			   size_t clength, uint8_t *dst, const uint8_t *src)
+{
+  ccm_encrypt_message(&ctx->cipher, (nettle_cipher_func *) aes128_encrypt,
+		      nlength, nonce, alength, adata,
+		      tlength, clength, dst, src);
+}
+
+int
+ccm_aes128_decrypt_message(struct ccm_aes128_ctx *ctx,
+			   size_t nlength, const uint8_t *nonce,
+			   size_t alength, const uint8_t *adata,
+			   size_t tlength,
+			   size_t clength, uint8_t *dst, const uint8_t *src)
+{
+  return ccm_decrypt_message(&ctx->cipher,
+			     (nettle_cipher_func *) aes128_encrypt,
+			     nlength, nonce, alength, adata,
+			     tlength, clength, dst, src);
+}
-- 
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