X-Git-Url: https://git.cryptolib.org/?p=arm-crypto-lib.git;a=blobdiff_plain;f=bcal%2Fbcal-cfb_byte.c;fp=bcal%2Fbcal-cfb_byte.c;h=36e2ecce75de9e8c77b3ae56dde3d2ca4c305a43;hp=0000000000000000000000000000000000000000;hb=d70d1d77bab1a5f5278227d674bc59da0378fe15;hpb=d00ed9a275c69fa3512007452e479abd98dbe745

diff --git a/bcal/bcal-cfb_byte.c b/bcal/bcal-cfb_byte.c
new file mode 100644
index 0000000..36e2ecc
--- /dev/null
+++ b/bcal/bcal-cfb_byte.c
@@ -0,0 +1,88 @@
+/* bcal-cfb_byte.c */
+/*
+    This file is part of the ARM-Crypto-Lib.
+    Copyright (C) 2006-2010  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 <stdint.h>
+#include <string.h>
+#include "bcal-cfb_byte.h"
+#include "bcal-basic.h"
+#include "memxor/memxor.h"
+
+
+uint8_t bcal_cfb_B_init(const bcdesc_t* desc, const void* key, uint16_t keysize_b, uint16_t size_b, bcal_cfb_B_ctx_t* ctx){
+	ctx->desc = (bcdesc_t*)desc;
+	ctx->blocksize_B = (bcal_cipher_getBlocksize_b(desc)+7)/8;
+	ctx->in_block=malloc(ctx->blocksize_B);
+	if(ctx->in_block==NULL){
+			return 0x11;
+	}
+	if(size_b&7){
+		return 0x12;
+	}
+	ctx->size_B = size_b/8;
+	return bcal_cipher_init(desc, key, keysize_b, &(ctx->cctx));
+}
+
+void bcal_cfb_B_free(bcal_cfb_B_ctx_t* ctx){
+	free(ctx->in_block);
+	bcal_cipher_free(&(ctx->cctx));
+}
+
+void bcal_cfb_B_loadIV(const void* iv, bcal_cfb_B_ctx_t* ctx){
+	if(iv){
+		memcpy(ctx->in_block, iv, ctx->blocksize_B);
+	}
+}
+
+void bcal_cfb_B_encNext(void* block, bcal_cfb_B_ctx_t* ctx){
+	uint8_t tmp[ctx->blocksize_B];
+	memcpy(tmp, ctx->in_block, ctx->blocksize_B);
+	bcal_cipher_enc(tmp, &(ctx->cctx));
+	memxor(block, tmp, ctx->size_B);
+	memmove(ctx->in_block, ctx->in_block+ctx->size_B, ctx->blocksize_B - ctx->size_B);
+	memcpy(ctx->in_block+ctx->blocksize_B-ctx->size_B, block, ctx->size_B);
+}
+
+void bcal_cfb_B_decNext(void* block, bcal_cfb_B_ctx_t* ctx){
+	uint8_t tmp[ctx->blocksize_B];
+	uint8_t xblock[ctx->size_B];
+	memcpy(xblock, block, ctx->size_B);
+	memcpy(tmp, ctx->in_block, ctx->blocksize_B);
+	bcal_cipher_enc(tmp, &(ctx->cctx));
+	memxor(block, tmp, ctx->size_B);
+	memmove(ctx->in_block, ctx->in_block+ctx->size_B, ctx->blocksize_B - ctx->size_B);
+	memcpy(ctx->in_block+ctx->blocksize_B-ctx->size_B, xblock, ctx->size_B);
+}
+
+void bcal_cfb_B_encMsg(const void* iv, void* msg, uint16_t msg_blocks, bcal_cfb_B_ctx_t* ctx){
+	bcal_cfb_B_loadIV(iv, ctx);
+	while(msg_blocks--){
+		bcal_cfb_B_encNext(msg, ctx);
+		msg = (uint8_t*)msg+ctx->size_B;
+	}
+}
+
+void bcal_cfb_B_decMsg(const void* iv, void* msg, uint16_t msg_blocks, bcal_cfb_B_ctx_t* ctx){
+	bcal_cfb_B_loadIV(iv, ctx);
+		while(msg_blocks--){
+			bcal_cfb_B_decNext(msg, ctx);
+			msg = (uint8_t*)msg+ctx->size_B;
+		}
+}
+