HMAC_MD5.ino

For Arduino
Updated: spaniakos 2015

This is an example of how to use HMAC of this MD5 library.
The text and keys can be either in HEX or String format.
The examples are from the RFC2202 Test Vectors

#include <MD5.h>

MD5  hashMD5;
/*
This is en example of how to use my MD5 library. It provides two
easy-to-use methods, one for generating the MD5 hash, and the second
one to generate the hex encoding of the hash, which is frequently used.
*/
void setup()
{
  unsigned long ms;
  //initialize serial
  Serial.begin(9600);
  //give it a second
  delay(1000);
  Serial.println("*********************");
  Serial.println("**HMAC MD5 examples**");
  Serial.println("*********************");
  Serial.println();

  char key[] = {0x0b,0x0b,0x0b,0x0b,0x0b,0x0b,0x0b,0x0b,0x0b,0x0b,0x0b,0x0b,0x0b,0x0b,0x0b,0x0b, 0x00};
  int key_len;
  key_len = strlen(key);
  char *text = "Hi There";
  int text_len;
  text_len = strlen(text);
  ms = micros();
  char *md5str = hashMD5.hmac_md5(text, text_len, key, key_len);
  //generate the digest (hex encoding) of our hash
  Serial.print("done. (");
  ms = micros() - ms;
  Serial.print(ms);
  Serial.println(" micros)");
  Serial.println("PLAIN   :Hi There");
  Serial.println("KEY     :0x0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b");
  Serial.println("EXPECTED:9294727a3638bb1c13f48ef8158bfc9d");
  Serial.print("RESULT  :");
  Serial.println(md5str);
  Serial.println();
  
  char *key2 = "Jefe";
  key_len = strlen(key2);
  char *text2 = "what do ya want for nothing?";
  text_len = strlen(text2);
  ms = micros();
  md5str = hashMD5.hmac_md5(text2, text_len, key2, key_len);
  //generate the digest (hex encoding) of our hash
  Serial.print("done. (");
  ms = micros() - ms;
  Serial.print(ms);
  Serial.println(" micros)");
  Serial.println("PLAIN   :what do ya want for nothing?");
  Serial.println("KEY     :Jefe");
  Serial.println("EXPECTED:750c783e6ab0b503eaa86e310a5db738");
  Serial.print("RESULT  :");
  Serial.println(md5str);
  Serial.println();
  
  char key3[] = {0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa, 0x00};
  key_len = strlen(key3);
  char text3[] = {0xdd,0xdd,0xdd,0xdd,0xdd,0xdd,0xdd,0xdd,0xdd,0xdd,
                  0xdd,0xdd,0xdd,0xdd,0xdd,0xdd,0xdd,0xdd,0xdd,0xdd,
                  0xdd,0xdd,0xdd,0xdd,0xdd,0xdd,0xdd,0xdd,0xdd,0xdd,
                  0xdd,0xdd,0xdd,0xdd,0xdd,0xdd,0xdd,0xdd,0xdd,0xdd,
                  0xdd,0xdd,0xdd,0xdd,0xdd,0xdd,0xdd,0xdd,0xdd,0xdd, 0x00
                 };
  text_len = strlen(text3);
  ms = micros();
  md5str = hashMD5.hmac_md5(text3, text_len, key3, key_len);
  //generate the digest (hex encoding) of our hash
  Serial.print("done. (");
  ms = micros() - ms;
  Serial.print(ms);
  Serial.println(" micros)");
  Serial.println("PLAIN   :0xaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa");
  Serial.println("KEY     :0xdd repeated 50 times");
  Serial.println("EXPECTED:56be34521d144c88dbb8c733f0e8b3f6");
  Serial.print("RESULT  :");
  Serial.println(md5str);
  Serial.println();
  
  char key4[] = {0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0a,
                 0x0b,0x0c,0x0d,0x0e,0x0f,0x10,0x11,0x12,0x13,0x14,
                 0x15,0x16,0x17,0x18,0x19, 0x00};
  key_len = strlen(key4);
  char text4[] = {0xcd,0xcd,0xcd,0xcd,0xcd,0xcd,0xcd,0xcd,0xcd,0xcd,
                  0xcd,0xcd,0xcd,0xcd,0xcd,0xcd,0xcd,0xcd,0xcd,0xcd,
                  0xcd,0xcd,0xcd,0xcd,0xcd,0xcd,0xcd,0xcd,0xcd,0xcd,
                  0xcd,0xcd,0xcd,0xcd,0xcd,0xcd,0xcd,0xcd,0xcd,0xcd,
                  0xcd,0xcd,0xcd,0xcd,0xcd,0xcd,0xcd,0xcd,0xcd,0xcd, 0x00
                 };
  text_len = strlen(text4);
  ms = micros();
  md5str = hashMD5.hmac_md5(text4, text_len, key4, key_len);
  //generate the digest (hex encoding) of our hash
  Serial.print("done. (");
  ms = micros() - ms;
  Serial.print(ms);
  Serial.println(" micros)");
  Serial.println("PLAIN   :0x0102030405060708090a0b0c0d0e0f10111213141516171819");
  Serial.println("KEY     :0xcd repeated 50 times");
  Serial.println("EXPECTED:697eaf0aca3a3aea3a75164746ffaa79");
  Serial.print("RESULT  :");
  Serial.println(md5str);
  Serial.println();
  
  char key5[] = {0x0c,0x0c,0x0c,0x0c,0x0c,0x0c,0x0c,0x0c,0x0c,0x0c,0x0c,0x0c,0x0c,0x0c,0x0c,0x0c,0x00};
  key_len = strlen(key5);
  char *text5 = "Test With Truncation";
  text_len = strlen(text5);
  ms = micros();
  md5str = hashMD5.hmac_md5(text5, text_len, key5, key_len);
  //generate the digest (hex encoding) of our hash
  Serial.print("done. (");
  ms = micros() - ms;
  Serial.print(ms);
  Serial.println(" micros)");
  Serial.println("PLAIN   :Test With Truncation");
  Serial.println("KEY     :0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c");
  Serial.println("EXPECTED:56461ef2342edc00f9bab995690efd4c");
  Serial.print("RESULT  :");
  Serial.println(md5str);
  Serial.println();
  
  char key6[] = {0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,
                 0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,
                 0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,
                 0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,
                 0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,
                 0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,
                 0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,
                 0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0x00
                };
  key_len = strlen(key6);
  char *text6 = "Test Using Larger Than Block-Size Key - Hash Key First";
  text_len = strlen(text6);
  ms = micros();
  md5str = hashMD5.hmac_md5(text6, text_len, key6, key_len);
  //generate the digest (hex encoding) of our hash
  Serial.print("done. (");
  ms = micros() - ms;
  Serial.print(ms);
  Serial.println(" micros)");
  Serial.println("PLAIN   :Test Using Larger Than Block-Size Key - Hash Key First");
  Serial.println("KEY     :0xaa repeated 80 times");
  Serial.println("EXPECTED:6b1ab7fe4bd7bf8f0b62e6ce61b9d0cd");
  Serial.print("RESULT  :");
  Serial.println(md5str);
  Serial.println();
  
  char key7[] = {0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,
                 0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,
                 0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,
                 0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,
                 0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,
                 0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,
                 0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,
                 0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0x00
                };
  key_len = strlen(key7);
  char *text7 = "Test Using Larger Than Block-Size Key and Larger Than One Block-Size Data";
  text_len = strlen(text7);
  ms = micros();
  md5str = hashMD5.hmac_md5(text7, text_len, key7, key_len);
  //generate the digest (hex encoding) of our hash
  Serial.print("done. (");
  ms = micros() - ms;
  Serial.print(ms);
  Serial.println(" micros)");
  Serial.println("PLAIN   :Test Using Larger Than Block-Size Key and Larger Than One Block-Size Data");
  Serial.println("KEY     :0xaa repeated 80 times");
  Serial.println("EXPECTED:6f630fad67cda0ee1fb1f562db3aa53e");
  Serial.print("RESULT  :");
  Serial.println(md5str);
  Serial.println();
}

void loop()
{
}