+gcm128

[avr-crypto-lib.git] / gcm / gcm128.h

diff --git a/gcm/gcm128.h b/gcm/gcm128.h
new file mode 100644 (file)
index 0000000..755b75a
--- /dev/null
+++ b/gcm/gcm128.h
@@ -0,0 +1,116 @@
+/* gcm128.h */
+/*
+    This file is part of the AVR-Crypto-Lib.
+    Copyright (C) 2015 Daniel Otte (daniel.otte@rub.de)
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    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, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef GCM_GCM128_H_
+#define GCM_GCM128_H_
+
+
+/* gcm128.c */
+/*
+    This file is part of the AVR-Crypto-Lib.
+    Copyright (C) 2006-2015 Daniel Otte (daniel.otte@rub.de)
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    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, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <inttypes.h>
+#include <stdlib.h>
+#include <string.h>
+#include <memxor.h>
+#include <blockcipher_descriptor.h>
+#include <gcm128.h>
+
+#define GCM128_BLOCK_BYTES 16
+#define GCM128_BLOCK_BITS (GCM128_BLOCK_BYTES * 8)
+
+#define GCM128_COUNT_BYTES 4
+#define GCM128_COUNT_BITS (GCM128_COUNT_BYTES * 8)
+
+
+
+typedef struct {
+    uint8_t tag[GCM128_BLOCK_BYTES];
+    uint8_t key[GCM128_BLOCK_BYTES];
+} ghash128_ctx_t;
+
+typedef struct {
+    ghash128_ctx_t ghash_ctx;
+    bcgen_ctx_t cipher_ctx;
+    uint8_t ctr[GCM128_BLOCK_BYTES];
+    uint8_t j0[GCM128_COUNT_BYTES];
+    uint32_t length_a;
+    uint32_t length_c;
+} gcm128_ctx_t;
+
+int8_t gcm128_init(
+        gcm128_ctx_t *ctx,
+        const bcdesc_t *cipher,
+        const void *key,
+        uint16_t key_length_b,
+        const void *iv,
+        uint16_t iv_length_b);
+
+void gcm128_add_ad_block(
+        gcm128_ctx_t *ctx,
+        const void *block );
+
+void gcm128_add_ad_final_block(
+        gcm128_ctx_t *ctx,
+        const void *block,
+        uint16_t length_b );
+
+void gcm128_encrypt_block(
+        gcm128_ctx_t *ctx,
+        void *dest,
+        const void *src);
+
+void gcm128_encrypt_final_block(
+        gcm128_ctx_t *ctx,
+        void *dest,
+        const void *src,
+        uint16_t length_b);
+
+void gcm128_decrypt_block(
+        gcm128_ctx_t *ctx,
+        void *dest,
+        const void *src);
+
+void gcm128_decrypt_final_block(
+        gcm128_ctx_t *ctx,
+        void *dest,
+        const void *src,
+        uint16_t length_b);
+
+void gcm128_finalize(
+        gcm128_ctx_t *ctx,
+        void *tag,
+        uint16_t tag_length_b);
+
+#endif /* GCM_GCM128_H_ */