Adding DES

Author: Luigi Gubello

Diff for: src/ArduinoBearSSL.h

@@ -30,6 +30,7 @@
 #include "SHA256.h"
 #include "MD5.h"
 #include "AES128.h"
+#include "DES.h"
 
 class ArduinoBearSSLClass {
 public:

Diff for: 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;

Diff for: 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