Base64 Encode/Decode for LoadRunner

 #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;

}

And here’s the actual 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<slen && i<len;i+=3,src+=3)

 { // Enc next 4 characters

 *(dest++)=base64encode_lut[(*src&0xFC)>>0x2];

 *(dest++)=base64encode_lut[(*src&0x3)<<0x4|(*(src+1)&0xF0)>>0x4];

 *(dest++)=((i+1)<slen)?base64encode_lut[(*(src+1)&0xF)<<0x2|(*(src+2)&0xC0)>>0x6]:'=';

 *(dest++)=((i+2)<slen)?base64encode_lut[*(src+2)&0x3F]:'=';

 }

 *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<slen&&i<len;i+=4,src+=4)

 { // 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|(c2&0x30)>>0x4;

 *(dest++)=(c3!=64)?((c2&0xF)<<0x4|(c3&0x3C)>>0x2):'\0';

 *(dest++)=(c4!=64)?((c3&0x3)<<0x6|c4&0x3F):'\0';

 }

 *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;

}