new makefile and modified build process

[avr-crypto-lib.git] / skein / ubi256.c

diff --git a/skein/ubi256.c b/skein/ubi256.c
new file mode 100644 (file)
index 0000000..09eb1e9
--- /dev/null
+++ b/skein/ubi256.c
@@ -0,0 +1,80 @@
+/* ubi256.c */
+/*
+    This file is part of the AVR-Crypto-Lib.
+    Copyright (C) 2009  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/>.
+*/
+/*
+ * \author  Daniel Otte
+ * \email   daniel.otte@rub.de
+ * \date    2009-03-12
+ * \license GPLv3 or later
+ * 
+ */
+
+#include <stdint.h>
+#include <string.h>
+#include "threefish.h"
+#include "memxor.h"
+#include "ubi.h"
+
+void ubi256_init(ubi256_ctx_t* ctx, const void* g, uint8_t type){
+       memset(ctx->tweak, 0, 15);
+       ctx->tweak[15] = 0x40+type;
+       memcpy(ctx->g, g, 32);
+}
+
+void ubi256_nextBlock(ubi256_ctx_t* ctx, const void* block){
+       threefish256_ctx_t tfctx;
+       ((uint64_t*)(ctx->tweak))[0] += UBI256_BLOCKSIZE_B;
+       threefish256_init(ctx->g, ctx->tweak, &tfctx);
+       memcpy(ctx->g, block, UBI256_BLOCKSIZE_B);
+       threefish256_enc(ctx->g, &tfctx);
+       memxor(ctx->g, block, UBI256_BLOCKSIZE_B);
+       ctx->tweak[15] &= (uint8_t)~0x40;
+} 
+
+
+void ubi256_lastBlock(ubi256_ctx_t* ctx, const void* block, uint16_t length_b){
+       threefish256_ctx_t tfctx;
+       while(length_b>UBI256_BLOCKSIZE){
+               ubi256_nextBlock(ctx, block);
+               block = (uint8_t*)block + UBI256_BLOCKSIZE_B;
+               length_b -= UBI256_BLOCKSIZE;
+       }
+       ctx->tweak[15] |= 0x80;
+       ((uint64_t*)(ctx->tweak))[0] += (length_b+7)/8;
+       if(length_b & 0x07){
+               ctx->tweak[14] |= 0x80;
+       }
+       threefish256_init(ctx->g, ctx->tweak, &tfctx);
+       memset(ctx->g, 0, UBI256_BLOCKSIZE_B);
+       memcpy(ctx->g, block, (length_b+7)/8);
+       if(length_b & 0x07){
+               ctx->g[((length_b+7)/8)-1] |= 0x80>>(length_b&7);
+               ctx->g[((length_b+7)/8)-1] &= ~((0x80>>(length_b&7))-1);
+       }
+       threefish256_enc(ctx->g, &tfctx);
+       memxor(ctx->g, block, (length_b+7)/8);
+       if(length_b & 0x07){
+               ctx->g[((length_b+7)/8)-1] ^= 0x80>>(length_b&7);
+       }
+
+} 
+
+void ubi256_ctx2hash(void* dest, const ubi256_ctx_t* ctx){
+       memcpy(dest, ctx->g, UBI256_BLOCKSIZE_B);
+}
+