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CyaSSL AES and HMAC example help... Error: Error: Identifier "word64" is undefined

Topic last updated 04 Mar 2015, by d 0773d. 2 replies
d 0773d
03 Mar 2015

I am attempting to encrypt my JSON string that contains sensor data using AES and HMAC for a basic encryption example and then later expand to later understand how encryption works.

My program can be found at:

Import programCyaSSL_Example

CyaSSL mbed example for my Educational purposes

Last commit 03 Mar 2015 by d 0773d

I am receiving this error: Error: Identifier "word64" is undefined in "CyaSSL/cyassl/ctaocrypt/random.h", Line: 101, Col: 5

How do I fix that error and also, how do I pass in the current encrypted array into the HMAC to hash the encrypted data?

I imported CyaSSL and edited the settings.h file to:

settings.h

#ifdef MBED
    //#define SINGLE_THREADED
    //#define NO_CERTS
    //#define USE_CERT_BUFFERS_1024

    #define CYASSL_USER_IO
    #define CYASSL_SHA256
    #define CYASSL_CMSIS_RTOS
    #define IGNORE_KEY_EXTENSIONS
    #define DEBUG_CYASSL

    #define NO_SHA384
    #define NO_ECC
    #define NO_FILESYSTEM
    #define NO_WRITEV
    #define NO_DEV_RANDOM
    #define NO_SHA512
    #define NO_DH
    #define NO_DSA
    #define NO_HC128
    #define NO_DES3
    #define NO_RC4
    #define NO_MD4
    #define NO_RABBIT
    #define NO_HC128
    #define NO_SESSION_CACHE
#endif

main.cpp

#include "mbed.h"

#include "cyassl/ctaocrypt/hmac.h"
#include "cyassl/ctaocrypt/aes.h"

#include "MbedJSONValue.h"
#include "LinearTempSensor.h"

int main() {
    
    pc.baud(115200);

    MbedJSONValue sensorResults;

    Aes enc;
    Aes dec;
    
    Hmac    hmac;
    
    bytekey[24];    // fill key with keying material
    bytebuferr[2048];   // fill buffer with data to digest
    bytehmacDigest[SHA256_DIGEST_SIZE];
    
    HmacSetKey(&hmac, SHA256, key, sizeof(key));
    HmacUpdate(&hmac, buffer, sizeof(buffer));
    HmacFinal(&hmac, hmacDigest);

    const byte key[16] = {  'm', 'n', 'b', 'v', 'c', 'x', 'z', 'l', 'k', 'j', 'h', 'g', 'f', 'd', 's', 'a' };
    const byte iv[16] = { 'a', 's', 'd', 'f', 'g', 'h', 'j', 'k', 'l', 'p', 'o', 'i', 'u', 'y', 't', 'r' };

    byte plain[128];   // an increment of 16, fill with data
    byte cipher[32];
    
    std::string s;
    
    Vout = sensor.Sense();          // Sample data (read sensor)
    Tav  = sensor.GetAverageTemp(); // Calculate average temperature from N samples
    To   = sensor.GetLatestTemp();  // Calculate temperature from the latest sample
    
    TempValue = sensor.GetAverageTemp();
    
    //Create JSON
    sensorResults["DATA1"][0] = "Result";
    sensorResults["DATA1"][1] = 5.5;
    sensorResults["DATA2"][0] = "Result";
    sensorResults["DATA2"][1] = 700;
    sensorResults["DATA3"][0] = "Result";
    sensorResults["DATA3"][1] = TempValue;

    //Serialize JSON
    s = sensorResults.serialize();
    //sl = s.size();

    //Print JSON string
    pc.printf("json: %s\r\n", s.c_str());
    
    //Convert JSON string to a char array to encrypt
    //char *a=new char[s.size()+1];
    plain[s.size()]=0;
    memcpy(plain,s.c_str(),s.size());//<-- Fills plain array with the JSON values
    
    // encrypt
    AesSetKey(&enc, key, sizeof(key), iv, AES_ENCRYPTION);
    AesCbcEncrypt(&enc, cipher, plain, sizeof(plain));
    
    //cipher now contains the cipher text from the plain text.
    
    // decrypt
    AesSetKey(&dec, key, sizeof(key), iv, AES_DECRYPTION);
    AesCbcDecrypt(&dec, plain, cipher, sizeof(cipher));
}
d 0773d
04 Mar 2015

I was able to fix my error. The following is what I did to fix the error: I researched the error by searching google which then directed me to this url: http://www.yassl.com/forums/post1933.html#p1933

Which then explained:

Quote:

Setting SIZEOF_LONG_LONG to 8 should be enabling the typedef for word64 in types.h.

Basically, I forgot to define the SIZEOF_LONG_LONG to 8. I commented out the HMAC code to get a basic AES example working. I still do not know how to implement HMAC. Can anyone help me get a working HMAC example?

d 0773d
04 Mar 2015

HERE is my updated working AES128 example settings.h and main.cpp code:

settings.h

#ifdef MBED
    //#define SINGLE_THREADED
    //#define NO_CERTS
    //#define USE_CERT_BUFFERS_1024
    #define SIZEOF_LONG_LONG 8

    #define CYASSL_USER_IO
    //#define CYASSL_SHA256
    #define CYASSL_CMSIS_RTOS
    #define IGNORE_KEY_EXTENSIONS
    #define DEBUG_CYASSL

    #define NO_CYASSL_SHA256
    #define NO_SHA384
    #define NO_ECC
    #define NO_FILESYSTEM
    #define NO_WRITEV
    #define NO_DEV_RANDOM
    #define NO_SHA512
    #define NO_DH
    #define NO_DSA
    #define NO_HC128
    #define NO_DES3
    #define NO_RC4
    #define NO_MD4
    #define NO_RABBIT
    #define NO_HC128
    #define NO_SESSION_CACHE
#endif

main.cpp

#include "mbed.h"

//#include "cyassl/ctaocrypt/hmac.h"
#include "cyassl/ctaocrypt/aes.h"

#include "MbedJSONValue.h"
#include "LinearTempSensor.h"

#include <string>

using namespace std;

Serial pc(USBTX, USBRX);

LinearTempSensor sensor(p20, 300, LinearTempSensor::MCP9701);
MbedJSONValue sensorResults;

Aes enc;
Aes dec;

float Vout, Tav, To, TempValue;

std::string s;

int main() {
    pc.baud(115200);
   
    /*Hmac    hmac;
    
    bytekey[24];    // fill key with keying material
    bytebuferr[2048];   // fill buffer with data to digest
    bytehmacDigest[SHA256_DIGEST_SIZE];
    
    HmacSetKey(&hmac, SHA256, key, sizeof(key));
    HmacUpdate(&hmac, buffer, sizeof(buffer));
    HmacFinal(&hmac, hmacDigest);*/

    const byte key[16] = {  'm', 'n', 'b', 'v', 'c', 'x', 'z', 'l', 'k', 'j', 'h', 'g', 'f', 'd', 's', 'a' };
    const byte iv[16] = { 'a', 's', 'd', 'f', 'g', 'h', 'j', 'k', 'l', 'p', 'o', 'i', 'u', 'y', 't', 'r' };

    byte plain[0x80];   // an increment of 16, fill with data
    byte cipher[0x80];
        
    Vout = sensor.Sense();          // Sample data (read sensor)
    Tav  = sensor.GetAverageTemp(); // Calculate average temperature from N samples
    To   = sensor.GetLatestTemp();  // Calculate temperature from the latest sample
    
    TempValue = sensor.GetAverageTemp();
    
    //Create JSON
    sensorResults["DATA1"][0] = "Result";
    sensorResults["DATA1"][1] = 5.5;
    sensorResults["DATA2"][0] = "Result";
    sensorResults["DATA2"][1] = 700;
    sensorResults["DATA3"][0] = "Result";
    sensorResults["DATA3"][1] = TempValue;

    //Serialize JSON
    s = sensorResults.serialize();
    //sl = s.size();

    //Print JSON string
    pc.printf("json: %s\r\n", s.c_str());
    
    //Convert JSON string to a char array to encrypt
    //char *a=new char[s.size()+1];
    plain[s.size()]=0;
    memcpy(plain,s.c_str(),s.size());//<-- Fills plain array with the JSON values
    
    // encrypt
    AesSetKey(&enc, key, sizeof(key), iv, AES_ENCRYPTION);
    AesCbcEncrypt(&enc, cipher, plain, sizeof(plain));
    
    //cipher now contains the cipher text from the plain text.
    
    // decrypt
    AesSetKey(&dec, key, sizeof(key), iv, AES_DECRYPTION);
    AesCbcDecrypt(&dec, plain, cipher, sizeof(cipher));

    pc.printf("\r\nEncrypted: ");
    for(char i=0; i<0x80; i++) 
    {
        //if(i%16==0) pc.printf("\r\n");
        pc.printf("%.2X",cipher[i]);
    }
}