Base64 Encode/Decode for LoadRunner

Code:

#include "base64.h"
vuser_init()
{
int res;
// ENCODE
lr_save_string("ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789","plain");
b64_encode_string( lr_eval_string("{plain}"), "b64str" );
lr_output_message("Encoded: %s", lr_eval_string("{b64str}") );

// DECODE
b64_decode_string( lr_eval_string("{b64str}"), "plain2" );
lr_output_message("Decoded: %s", lr_eval_string("{plain2}") );

// Verify decoded matches original plain text
res = strcmp( lr_eval_string("{plain}"), lr_eval_string("{plain2}") );
if (res==0) lr_output_message("Decoded matches original plain text");

return 0;
}

 base64.h include file

/*
Base 64 Encode and Decode functions for LoadRunner
==================================================
This include file provides functions to Encode and Decode
LoadRunner variables. It's based on source codes found on the
internet and has been modified to work in LoadRunner.

Created by Kim Sandell / Celarius - www.celarius.com
*/
// Encoding lookup table
char base64encode_lut[] = {
'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q',
'R','S','T','U','V','W','X','Y','Z','a','b','c','d','e','f','g','h',
'i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y',
'z','0','1','2','3','4','5','6','7','8','9','+','/','='};

// Decode lookup table
char base64decode_lut[] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0,62, 0, 0, 0,63,52,53,54,55,56,57,58,59,60,61, 0, 0,
0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,
15,16,17,18,19,20,21,22,23,24,25, 0, 0, 0, 0, 0, 0,26,27,28,
29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,
49,50,51, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, };

void base64encode(char *src, char *dest, int len)
// Encodes a buffer to base64
{
int i=0, slen=strlen(src);
for(i=0;i
{ // Enc next 4 characters
*(dest++)=base64encode_lut[(*src&0xFC)>>0x2];
*(dest++)=base64encode_lut[(*src&0x3)<<0x4 amp="" src="" xf0="">>0x4];
*(dest++)=((i+1)>0x6]:'=';
*(dest++)=((i+2)
}
*dest='\0'; // Append terminator
}

void base64decode(char *src, char *dest, int len)
// Encodes a buffer to base64
{
int i=0, slen=strlen(src);
for(i=0;i
{ // Store next 4 chars in vars for faster access
char c1=base64decode_lut[*src], c2=base64decode_lut[*(src+1)], c3=base64decode_lut[*(src+2)], c4=base64decode_lut[*(src+3)];
// Decode to 3 chars
*(dest++)=(c1&0x3F)<<0x2 amp="" c2="" x30="">>0x4;
*(dest++)=(c3!=64)?((c2&0xF)<<0x4 amp="" c3="" x3c="">>0x2):'\0';
*(dest++)=(c4!=64)?((c3&0x3)<<0x6 amp="" c4="" div="" x3f="">
}
*dest='\0'; // Append terminator
}

int b64_encode_string( char *source, char *lrvar )
// ----------------------------------------------------------------------------
// Encodes a string to base64 format
//
// Parameters:
// source Pointer to source string to encode
// lrvar LR variable where base64 encoded string is stored
//
// Example:
//
// b64_encode_string( "Encode Me!", "b64" )
// ----------------------------------------------------------------------------
{
int dest_size;
int res;
char *dest;
// Allocate dest buffer
dest_size = 1 + ((strlen(source)+2)/3*4);
dest = (char *)malloc(dest_size);
memset(dest,0,dest_size);
// Encode & Save
base64encode(source, dest, dest_size);
lr_save_string( dest, lrvar );
// Free dest buffer
res = strlen(dest);
free(dest);
// Return length of dest string
return res;
}

int b64_decode_string( char *source, char *lrvar )
// ----------------------------------------------------------------------------
// Decodes a base64 string to plaintext
//
// Parameters:
// source Pointer to source base64 encoded string
// lrvar LR variable where decoded string is stored
//
// Example:
//
// b64_decode_string( lr_eval_string("{b64}"), "Plain" )
// ----------------------------------------------------------------------------
{
int dest_size;
int res;
char *dest;
// Allocate dest buffer
dest_size = strlen(source);
dest = (char *)malloc(dest_size);
memset(dest,0,dest_size);
// Encode & Save
base64decode(source, dest, dest_size);
lr_save_string( dest, lrvar );
// Free dest buffer
res = strlen(dest);
free(dest);
// Return length of dest string
return res;

1 comment:

Narasimhan Sethurama said...

Can you please let me know, how to write code a for randomly generating password field - it a banking account, takes username and password, but password is a security 10 digit code like {1 2 3 4 5 6 7 8 9 0} every time asks for different combination .., like enter 5th 3rd 7th 8th number.., next login 6th 9th 2nd 4th etc.