X-Git-Url: https://git.cryptolib.org/?p=arm-crypto-lib.git;a=blobdiff_plain;f=noekeon%2Fnoekeon_prng.c;fp=noekeon%2Fnoekeon_prng.c;h=17c71a5a3a96d22bd2598441d8e5edf4dad4ecfa;hp=0000000000000000000000000000000000000000;hb=d70d1d77bab1a5f5278227d674bc59da0378fe15;hpb=d00ed9a275c69fa3512007452e479abd98dbe745

diff --git a/noekeon/noekeon_prng.c b/noekeon/noekeon_prng.c
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+++ b/noekeon/noekeon_prng.c
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+/* noekeon_prng.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/>.
+ */
+/**
+ * \author	Daniel Otte
+ * \date	2008-08-24
+ * \license GPLv3 or later
+ * \brief   random number generator based on noekeon running in CFB-mode
+ * 
+ */
+
+#include "noekeon/noekeon.h"
+#include "memxor/memxor.h"
+#include <stdint.h>
+#include <string.h>
+
+static uint8_t random_state[16];
+static uint8_t random_key[16];
+static uint8_t i=0;
+
+uint8_t random8(void){
+	static uint8_t sr[16];
+	
+	if(i==0){
+		noekeon_enc(random_state, random_key);
+		memcpy(sr, random_state, 16);
+		i=15;
+		return sr[15];
+	}
+	--i;
+	return sr[i];
+}
+
+void random_block(void* dest){
+	i=0;
+	noekeon_enc(random_state, random_key);
+	memcpy(dest, random_state, 16);
+}
+
+void srandom32(uint32_t seed){
+	memcpy(random_key, &seed, 4);
+}
+
+void random_seed(const void* buffer){
+	memcpy(random_key, buffer, 16);
+}
+
+void random_add(const void* buffer){
+	memxor(random_key, buffer, 16);
+}
+
+