Add MD5 API and example

examples/MD5/MD5.ino

@@ -0,0 +1,64 @@
+/*
+  ArduinoBearSSL MD5
+
+  This sketch demonstrates how to create a MD5 hash
+  for an input string.
+
+  This example code is in the public domain.
+*/
+
+#include <ArduinoBearSSL.h>
+
+void setup() {
+  Serial.begin(9600);
+  while (!Serial);
+
+  // expect 9e107d9d372bb6826bd81d3542a419d6
+  printMD5("The quick brown fox jumps over the lazy dog");
+
+  // expect 80070713463e7749b90c2dc24911e275
+  printHMACMD5("key", "The quick brown fox jumps over the lazy dog");
+}
+
+void loop() {
+}
+
+void printMD5(const char* str) {
+  Serial.print("MD5 of '");
+  Serial.print(str);
+  Serial.print("' is 0x");
+
+  MD5.beginHash();
+  MD5.print(str);
+  MD5.endHash();
+
+  printResult();
+}
+
+void printHMACMD5(const char* secret, const char* str) {
+  Serial.print("HMAC-MD5 of '");
+  Serial.print(str);
+  Serial.print("' with secret '");
+  Serial.print(secret);
+  Serial.print("' is 0x");
+
+  MD5.beginHmac(secret);
+  MD5.print(str);
+  MD5.endHmac();
+
+  printResult();
+}
+
+void printResult()
+{
+  while (MD5.available()) {
+    byte b = MD5.read();
+
+    if (b < 16) {
+      Serial.print("0");
+    }
+
+    Serial.print(b, HEX);
+  }
+  Serial.println();
+}

src/ArduinoBearSSL.h

@@ -28,6 +28,7 @@
 #include "BearSSLClient.h"
 #include "SHA1.h"
 #include "SHA256.h"
+#include "MD5.h"
 
 class ArduinoBearSSLClass {
 public:

src/MD5.cpp

@@ -0,0 +1,57 @@
+/*
+ * 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 "MD5.h"
+
+MD5Class::MD5Class() :
+  SHAClass(MD5_BLOCK_SIZE, MD5_DIGEST_SIZE)
+{
+}
+
+MD5Class::~MD5Class()
+{
+}
+
+int MD5Class::begin()
+{
+  br_md5_init(&_ctx);
+
+  return 1;
+}
+
+int MD5Class::update(const uint8_t *buffer, size_t size)
+{
+  br_md5_update(&_ctx, buffer, size);
+
+  return 1;
+}
+
+int MD5Class::end(uint8_t *digest)
+{
+  br_md5_out(&_ctx, digest);
+
+  return 1;
+}
+
+MD5Class MD5;

src/MD5.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 MD5_H
+#define MD5_H
+
+#include <bearssl/bearssl_hash.h>
+
+#include "SHA.h"
+
+#define MD5_BLOCK_SIZE 64
+#define MD5_DIGEST_SIZE 16
+
+class MD5Class: public SHAClass {
+
+public:
+  MD5Class();
+  virtual ~MD5Class();
+
+protected:
+  virtual int begin();
+  virtual int update(const uint8_t *buffer, size_t size);
+  virtual int end(uint8_t *digest);
+
+private:
+  br_md5_context _ctx;
+};
+
+extern MD5Class MD5;
+
+#endif