fpga: added iCLASS on deviceside

armsrc/optimized_cipherutils.c

@@ -0,0 +1,140 @@
+/*****************************************************************************
+ * WARNING
+ *
+ * THIS CODE IS CREATED FOR EXPERIMENTATION AND EDUCATIONAL USE ONLY.
+ *
+ * USAGE OF THIS CODE IN OTHER WAYS MAY INFRINGE UPON THE INTELLECTUAL
+ * PROPERTY OF OTHER PARTIES, SUCH AS INSIDE SECURE AND HID GLOBAL,
+ * AND MAY EXPOSE YOU TO AN INFRINGEMENT ACTION FROM THOSE PARTIES.
+ *
+ * THIS CODE SHOULD NEVER BE USED TO INFRINGE PATENTS OR INTELLECTUAL PROPERTY RIGHTS.
+ *
+ *****************************************************************************
+ *
+ * This file is part of loclass. It is a reconstructon of the cipher engine
+ * used in iClass, and RFID techology.
+ *
+ * The implementation is based on the work performed by
+ * Flavio D. Garcia, Gerhard de Koning Gans, Roel Verdult and
+ * Milosch Meriac in the paper "Dismantling IClass".
+ *
+ * Copyright (C) 2014 Martin Holst Swende
+ *
+ * This is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation, or, at your option, any later version.
+ *
+ * This file 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 loclass.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ *
+ ****************************************************************************/
+#include "optimized_cipherutils.h"
+#include <stdint.h>
+
+/**
+ *
+ * @brief Return and remove the first bit (x0) in the stream : <x0 x1 x2 x3 ... xn >
+ * @param stream
+ * @return
+ */
+bool headBit(BitstreamIn *stream) {
+    int bytepos = stream->position >> 3; // divide by 8
+    int bitpos = (stream->position++) & 7; // mask out 00000111
+    return (*(stream->buffer + bytepos) >> (7 - bitpos)) & 1;
+}
+/**
+ * @brief Return and remove the last bit (xn) in the stream: <x0 x1 x2 ... xn>
+ * @param stream
+ * @return
+ */
+bool tailBit(BitstreamIn *stream) {
+    int bitpos = stream->numbits - 1 - (stream->position++);
+
+    int bytepos = bitpos >> 3;
+    bitpos &= 7;
+    return (*(stream->buffer + bytepos) >> (7 - bitpos)) & 1;
+}
+/**
+ * @brief Pushes bit onto the stream
+ * @param stream
+ * @param bit
+ */
+void pushBit(BitstreamOut *stream, bool bit) {
+    int bytepos = stream->position >> 3; // divide by 8
+    int bitpos = stream->position & 7;
+    *(stream->buffer + bytepos) |= (bit) << (7 - bitpos);
+    stream->position++;
+    stream->numbits++;
+}
+
+/**
+ * @brief Pushes the lower six bits onto the stream
+ * as b0 b1 b2 b3 b4 b5 b6
+ * @param stream
+ * @param bits
+ */
+void push6bits(BitstreamOut *stream, uint8_t bits) {
+    pushBit(stream, bits & 0x20);
+    pushBit(stream, bits & 0x10);
+    pushBit(stream, bits & 0x08);
+    pushBit(stream, bits & 0x04);
+    pushBit(stream, bits & 0x02);
+    pushBit(stream, bits & 0x01);
+}
+
+/**
+ * @brief bitsLeft
+ * @param stream
+ * @return number of bits left in stream
+ */
+int bitsLeft(BitstreamIn *stream) {
+    return stream->numbits - stream->position;
+}
+/**
+ * @brief numBits
+ * @param stream
+ * @return Number of bits stored in stream
+ */
+void x_num_to_bytes(uint64_t n, size_t len, uint8_t *dest) {
+    while (len--) {
+        dest[len] = (uint8_t) n;
+        n >>= 8;
+    }
+}
+
+uint64_t x_bytes_to_num(uint8_t *src, size_t len) {
+    uint64_t num = 0;
+    while (len--) {
+        num = (num << 8) | (*src);
+        src++;
+    }
+    return num;
+}
+
+uint8_t reversebytes(uint8_t b) {
+    b = (b & 0xF0) >> 4 | (b & 0x0F) << 4;
+    b = (b & 0xCC) >> 2 | (b & 0x33) << 2;
+    b = (b & 0xAA) >> 1 | (b & 0x55) << 1;
+    return b;
+}
+
+void reverse_arraybytes(uint8_t *arr, size_t len) {
+    uint8_t i;
+    for (i = 0; i < len ; i++) {
+        arr[i] = reversebytes(arr[i]);
+    }
+}
+
+void reverse_arraycopy(uint8_t *arr, uint8_t *dest, size_t len) {
+    uint8_t i;
+    for (i = 0; i < len ; i++) {
+        dest[i] = reversebytes(arr[i]);
+    }
+}
+