Go4Expert - Program runs correctly, but SIGSEGV

Hi all,
My code is giving the desired o/p, but at the end its producing segmentation fault.
(I know this is very column and also I have checked other posts, but couldn't understand the solution)
Here is my code

Code:

#include <stdio.h> 

#include <stdlib.h> 

#include <string.h> 

#include <ctype.h> 

 

#include "blake.h" 

 

 

 

 

int    genShortMsg(int hashbitlen); 

 

 

 

int 

main() 

{ 

    int ret_val;

 

    ret_val = genShortMsg(256);

     

    return 0; 

     

} 

 

 

 

int  

genShortMsg(int hashbitlen) 

{ 

 

    int            msglen, msgbytelen; 

    BitSequence    Msg[7], MD[64]; 

 

        msglen=55;     

        msgbytelen = (msglen+7)/8; 

     

 

 

    int        ch, started; 

    BitSequence    ich; 

    int i; 

    if ( msgbytelen == 0 ) { 

        Msg[0] = 0x00; 

         

    } 

    memset(Msg, 0x00, msgbytelen); 

    started = 0; 

    char str[] = "14B06DD54EB364"; 

    int j; 

 

    for(j=0;j<strlen(str);j++){ 

        ch=str[j]; 

            if ( (ch >= '0') && (ch <= '9') ) 

                ich = ch - '0'; 

            else if ( (ch >= 'A') && (ch <= 'F') ) 

                ich = ch - 'A' + 10; 

             

            else if ( (ch >= 'a') && (ch <= 'f') ) 

                ich = ch - 'a' + 10; 

             

            for ( i=0; i<msgbytelen-1; i++ )Msg[i] = (Msg[i] << 4) | (Msg[i+1] >> 4); 

            Msg[msgbytelen-1] = (Msg[msgbytelen-1] << 4) | ich; 

 

    } 

          

     

        for(i=0;i<64;i++)MD[i]=0; 

     

         

        Hash(256, Msg, msglen, MD); 

     

        for(i=0;i<32;++i)printf("%02X",MD[i]);

 

        printf("\n");



 

    return 0; 

}

It prints correct o/p(computed by Hash(.......)), but crashes when genShortMsg() returns.

Thanks in advance for the reply