X-Git-Url: https://git.cryptolib.org/?a=blobdiff_plain;f=skein%2Fskein256.c;fp=skein%2Fskein256.c;h=dfe6ef3a427c64f2e84cd72eda858cbea0fab3d5;hb=4f50c75ee5a6cc88bf7ea71957ed509e298e6c25;hp=0000000000000000000000000000000000000000;hpb=7701e318e4e2bac7f84dbf6e368f1501814948fc;p=avr-crypto-lib.git

diff --git a/skein/skein256.c b/skein/skein256.c
new file mode 100644
index 0000000..dfe6ef3
--- /dev/null
+++ b/skein/skein256.c
@@ -0,0 +1,94 @@
+/* skein256.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 "ubi.h"
+#include "skein.h"
+
+#include "cli.h"
+
+void skein256_init(skein256_ctx_t* ctx, uint16_t outsize_b){
+	skein_config_t conf;
+	uint8_t null[UBI256_BLOCKSIZE_B];
+	memset(null, 0, UBI256_BLOCKSIZE_B);
+	memset(&conf, 0, sizeof(skein_config_t));
+	conf.schema[0] = 'S';
+	conf.schema[1] = 'H';
+	conf.schema[2] = 'A';
+	conf.schema[3] = '3';
+	conf.version = 1;
+	conf.out_length = outsize_b;
+	ctx->outsize_b = outsize_b;
+	ubi256_init(&(ctx->ubictx), null, UBI_TYPE_CFG);
+	ubi256_lastBlock(&(ctx->ubictx), &conf, 256);
+	ubi256_init(&(ctx->ubictx), ctx->ubictx.g, UBI_TYPE_MSG);
+}
+
+void skein256_nextBlock(skein256_ctx_t* ctx, const void* block){
+	ubi256_nextBlock(&(ctx->ubictx), block);
+}
+
+void skein256_lastBlock(skein256_ctx_t* ctx, const void* block, uint16_t length_b){
+	ubi256_lastBlock(&(ctx->ubictx), block, length_b);
+}
+
+void skein256_ctx2hash(void* dest, skein256_ctx_t* ctx){
+	ubi256_ctx_t uctx;
+	uint16_t outsize_b;
+	
+	uint64_t counter=0;
+	uint8_t outbuffer[UBI256_BLOCKSIZE_B];
+	ubi256_init(&(ctx->ubictx), ctx->ubictx.g, UBI_TYPE_OUT);
+	
+	outsize_b = ctx->outsize_b;
+	while(1){
+		memcpy(&uctx, &(ctx->ubictx), sizeof(ubi256_ctx_t));
+		ubi256_lastBlock(&uctx, &counter, 64);
+		ubi256_ctx2hash(outbuffer, &uctx);
+		if(outsize_b<=UBI256_BLOCKSIZE){
+			memcpy(dest, outbuffer, (outsize_b+7)/8);
+			break;
+		}else{
+			memcpy(dest, outbuffer, UBI256_BLOCKSIZE_B);
+			dest = (uint8_t*)dest + UBI256_BLOCKSIZE_B;
+			outsize_b -= UBI256_BLOCKSIZE;
+			counter++;
+		}
+	}
+}
+
+void skein256(void* dest, uint16_t outlength_b,const void* msg, uint32_t length_b){
+	skein256_ctx_t ctx;
+	skein256_init(&ctx, outlength_b);
+	while(length_b>SKEIN256_BLOCKSIZE){
+		skein256_nextBlock(&ctx, msg);
+		msg = (uint8_t*)msg + SKEIN256_BLOCKSIZE_B;
+		length_b -= SKEIN256_BLOCKSIZE;
+	}
+	skein256_lastBlock(&ctx, msg, length_b);
+	skein256_ctx2hash(dest, &ctx);
+}