Adding symmetric encryption

examples/AES128/AES128.ino

@@ -0,0 +1,64 @@
+/*
+  ArduinoCrypto AES128 Example
+
+  This sketch demonstrates how to run AES128 encryption and decryption for an input string.
+
+  Circuit:
+  - Nano 33 IoT board
+
+  created 13 July 2020
+  by Luigi Gubello
+
+  This example code is in the public domain.
+*/
+
+#include <ArduinoBearSSL.h>
+
+uint8_t key[16] = {0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x02};
+uint8_t enc_iv[16] = {0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x01,0x01};
+uint8_t dec_iv[16] = {0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x01,0x01};
+uint8_t input[16] = "ArduinoArduino"; // {0x41,0x72,0x64,0x75,0x69,0x6E,0x6F,0x41,0x72,0x64,0x75,0x69,0x6E,0x6F,0x00,0x00}
+
+void setup() {
+  Serial.begin(9600);
+  while (!Serial);
+}
+
+void loop() {
+
+  Serial.print("Key: ");
+  printHex(key, 16);
+  Serial.println(" ");
+  Serial.print("IV: ");
+  printHex(enc_iv, 16);
+  Serial.println(" ");
+  Serial.print("AES128 Encryption of '");
+  printHex(input, 16);
+  Serial.print("' is 0x");
+  AES128.runEnc(key, 16, input, 16, enc_iv);   // expect 0x65D0F7758B094114AFA6D33A5EA0716A
+  printHex(input, 16);
+  Serial.println(" ");
+  Serial.println(" ");
+  Serial.print("Key: ");
+  printHex(key, 16);
+  Serial.println(" ");
+  Serial.print("IV: ");
+  printHex(dec_iv, 16);
+  Serial.println(" ");
+  Serial.print("AES128 Decryption of '");
+  printHex(input, 16);
+  Serial.print("' is 0x");
+  AES128.runDec(key, 16, input, 16, dec_iv);
+  printHex(input, 16);
+  Serial.println(" ");
+  while (1);
+}
+
+void printHex(uint8_t *text, size_t size) {
+  for (byte i = 0; i < size; i = i + 1) {
+    if (text[i] < 16) {
+      Serial.print("0");
+    }
+    Serial.print(text[i], HEX);
+  }
+}

examples/DES/DES.ino

@@ -0,0 +1,64 @@
+/*
+  ArduinoCrypto DES Example
+
+  This sketch demonstrates how to run DES encryption and decryption for an input string.
+
+  Circuit:
+  - Nano 33 IoT board
+
+  created 13 July 2020
+  by Luigi Gubello
+
+  This example code is in the public domain.
+*/
+
+#include <ArduinoBearSSL.h>
+
+uint8_t key[8] = {0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x02};
+uint8_t enc_iv[8] = {0x00,0x00,0x00,0x00,0x00,0x01,0x01,0x01};
+uint8_t dec_iv[8] = {0x00,0x00,0x00,0x00,0x00,0x01,0x01,0x01};
+uint8_t input[8] = "Arduino"; // {0x41,0x72,0x64,0x75,0x69,0x6E,0x6F,0x00}
+
+void setup() {
+  Serial.begin(9600);
+  while (!Serial);
+}
+
+void loop() {
+
+  Serial.print("Key: ");
+  printHex(key, 8);
+  Serial.println(" ");
+  Serial.print("IV: ");
+  printHex(enc_iv, 8);
+  Serial.println(" ");
+  Serial.print("DES Encryption of '");
+  printHex(input, 8);
+  Serial.print("' is 0x");
+  DES.runEnc(key, 8, input, 8, enc_iv);   // expect 0x3C21EB6A62D372DB
+  printHex(input, 8);
+  Serial.println(" ");
+  Serial.println(" ");
+  Serial.print("Key: ");
+  printHex(key, 8);
+  Serial.println(" ");
+  Serial.print("IV: ");
+  printHex(dec_iv, 8);
+  Serial.println(" ");
+  Serial.print("DES Decryption of '");
+  printHex(input, 8);
+  Serial.print("' is 0x");
+  DES.runDec(key, 8, input, 8, dec_iv);
+  printHex(input, 8);
+  Serial.println(" ");
+  while (1);
+}
+
+void printHex(uint8_t *text, size_t size) {
+  for (byte i = 0; i < size; i = i + 1) {
+    if (text[i] < 16) {
+      Serial.print("0");
+    }
+    Serial.print(text[i], HEX);
+  }
+}

src/AES128.cpp

@@ -0,0 +1,52 @@
+/*
+ * Copyright (c) 2019 Arduino SA. All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining 
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be 
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include "AES128.h"
+
+AES128Class::AES128Class() :
+  EncryptionClass(AES128_BLOCK_SIZE, AES128_DIGEST_SIZE)
+{
+}
+
+AES128Class::~AES128Class()
+{
+}
+
+int AES128Class::runEncryption(uint8_t *key, size_t size, uint8_t *input, size_t block_size, uint8_t *iv)
+{
+  br_aes_ct_cbcenc_init(&cbcenc_ctx, key, size);
+  br_aes_ct_cbcenc_run(&cbcenc_ctx, iv, input, block_size); // block_size must be multiple of 16
+
+  return 1;
+}
+
+int AES128Class::runDecryption(uint8_t *key, size_t size, uint8_t *input, size_t block_size, uint8_t *iv)
+{
+  br_aes_ct_cbcdec_init(&cbcdec_ctx, key, size);
+  br_aes_ct_cbcdec_run(&cbcdec_ctx, iv, input, block_size); // block_size must be multiple of 16
+
+  return 1;
+}
+
+AES128Class AES128;

src/AES128.h

@@ -0,0 +1,52 @@
+/*
+ * Copyright (c) 2019 Arduino SA. All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining 
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be 
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#ifndef AES128_H
+#define AES128_H
+
+#include <bearssl/bearssl_block.h>
+
+#include "Encryption.h"
+
+#define AES128_BLOCK_SIZE 16
+#define AES128_DIGEST_SIZE 16
+
+class AES128Class: public EncryptionClass {
+
+public:
+  AES128Class();
+  virtual ~AES128Class();
+
+protected:
+  virtual int runEncryption(uint8_t *key, size_t size, uint8_t *input, size_t block_size, uint8_t *iv);
+  virtual int runDecryption(uint8_t *key, size_t size, uint8_t *input, size_t block_size, uint8_t *iv);
+
+private:
+  br_aes_ct_cbcenc_keys cbcenc_ctx;
+  br_aes_ct_cbcdec_keys cbcdec_ctx;
+};
+
+extern AES128Class AES128;
+
+#endif

src/ArduinoBearSSL.h

@@ -29,6 +29,8 @@
 #include "SHA1.h"
 #include "SHA256.h"
 #include "MD5.h"
+#include "AES128.h"
+#include "DES.h"
 
 class ArduinoBearSSLClass {
 public:

src/DES.cpp

@@ -0,0 +1,52 @@
+/*
+ * Copyright (c) 2019 Arduino SA. All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining 
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be 
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include "DES.h"
+
+DESClass::DESClass() :
+  EncryptionClass(DES_BLOCK_SIZE, DES_DIGEST_SIZE)
+{
+}
+
+DESClass::~DESClass()
+{
+}
+
+int DESClass::runEncryption(uint8_t *key, size_t size, uint8_t *input, size_t block_size, uint8_t *iv)
+{
+  br_des_ct_cbcenc_init(&cbcenc_ctx, key, size);
+  br_des_ct_cbcenc_run(&cbcenc_ctx, iv, input, block_size); // block_size must be multiple of 8
+
+  return 1;
+}
+
+int DESClass::runDecryption(uint8_t *key, size_t size, uint8_t *input, size_t block_size, uint8_t *iv)
+{
+  br_des_ct_cbcdec_init(&cbcdec_ctx, key, size);
+  br_des_ct_cbcdec_run(&cbcdec_ctx, iv, input, block_size); // block_size must be multiple of 8
+
+  return 1;
+}
+
+DESClass DES;

src/DES.h

@@ -0,0 +1,52 @@
+/*
+ * Copyright (c) 2019 Arduino SA. All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining 
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be 
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#ifndef DES_H
+#define DES_H
+
+#include <bearssl/bearssl_block.h>
+
+#include "Encryption.h"
+
+#define DES_BLOCK_SIZE 8
+#define DES_DIGEST_SIZE 8
+
+class DESClass: public EncryptionClass {
+
+public:
+  DESClass();
+  virtual ~DESClass();
+
+protected:
+  virtual int runEncryption(uint8_t *key, size_t size, uint8_t *input, size_t block_size, uint8_t *iv);
+  virtual int runDecryption(uint8_t *key, size_t size, uint8_t *input, size_t block_size, uint8_t *iv);
+
+private:
+  br_des_ct_cbcenc_keys cbcenc_ctx;
+  br_des_ct_cbcdec_keys cbcdec_ctx;
+};
+
+extern DESClass DES;
+
+#endif