Showing undefined reference to a defined object

I'm trying to Hash few strings in my project. And i'm using following project that uses HAMC SHA1 algorithm http://www.codeproject.com/KB/recipes/HMACSHA1class.aspx

I was able to compile the whole code after lots of trouble. But in the end i'm left with the final issue relating to undefined references.

I have written following code to envoke the HMAC SHA1 classes given in the project which is as follows

BYTE Key[20] ;
BYTE digest[20] ; 

unsigned char *test = (unsigned char *)"Hi There" ; 

extern "C" {
 jstring Java_com_example_hellojni_HelloJni_stringFromJNI( JNIEnv* env, jobject thiz );
}


jstring Java_com_example_hellojni_HelloJni_stringFromJNI( JNIEnv* env, jobject thiz )
{

memset(Key, 0x0b, 20) ;

CHMAC_SHA1 HMAC_SHA1 ;

HMAC_SHA1.HMAC_SHA1(test, strlen((const char *)test), Key, sizeof(Key), digest) ;

    return env->NewStringUTF("Hello from JNI Sample!");

}

Error encountered on the following lines of HMAC_SHA1.cpp which are as follows:

CSHA1::Update((UNIT_8 *)key, key_len);

CSHA1::Update((UNIT_8 *)AppendBuf1, sizeof(m_ipad) + text_len);

CSHA1::Update((UNIT_8 *)AppendBuf2, sizeof(m_opad) + SHA1_DIGEST_LENGTH);

Here I get an error:

Error: undefined reference to 'CSHA1::Update(unsigned char*, unsigned long)'

Now in SHA1.h

i can see following code

///////////////////////////////////////////////////////////////////////////// // Define 8- and 32-bit variables

#ifndef UINT_32

#ifdef _MSC_VER

#define UINT_8  unsigned __int8
#define UINT_32 unsigned __int32

#else

#define UINT_8 unsigned char

#if (ULONG_MAX == 0xFFFFFFFF)
#define UINT_32 unsigned long
#else
#define UINT_32 unsigned int
#endif

#endif
#endif

//////////////////////////////////// and the function declaration is as follows:

// Update the hash value
void Update(UINT_8 *data, UINT_32 len);

I'm using windows environment but compiling in cygwin.

I'm not sure why i am getting such error

Error: undefined reference to 'CSHA1::Update(unsigned char*, unsigned long)'

Can anyone please point out what is the issue and how it can be rectified?

I believe someting is wrong with _MSC_VER cause it should be false and then UINT_8 should be defined by unsigned char. Please help.

SHA1.h does not include climits, hence ULONG_MAX is undefined. That leads to problems on 32 bit systems.

Say #include <climits> somewhere at the top of the file and you should be done.