[openssl.org #505] DES CBC Initial Vector Parameter Problem

[via RT]

Hi,
 
I'm using the latest (0.9.7) Crypto lib to encrypt a string of clear 
text, by using CBC mode with IV preset to 8 bytes of 0x00.
When the encrypted text was decrypted back to plain text, the first 8 
bytes are bad text.  I believe there are something to do with the IV 
parameter, or I call the functions incorrectly.  Please help!!
 
Here are the source code and the output:
=============================================
 
#include <iostream.h>
#include <stdio.h>
#include <openssl/des.h>
 
#include "HubUtil.h"
 
int main() {
 
  char mKey[8];
  mKey[0] = 0xb1;
  mKey[1] = 0xa5;
  mKey[2] = 0x38;
  mKey[3] = 0x58;
  mKey[4] = 0xb2;
  mKey[5] = 0x60;
  mKey[6] = 0xd7;
  mKey[7] = 0x38;
 
  char myIV[8];
  myIV[0] = 0x00;
  myIV[1] = 0x00;
  myIV[2] = 0x00;
  myIV[3] = 0x00;
  myIV[4] = 0x00;
  myIV[5] = 0x00;
  myIV[6] = 0x00;
  myIV[7] = 0x00;
 
  DES_cblock cbKey;
  DES_cblock cbIV;
  DES_key_schedule kSchedule;
 
  char inS[] = "Hello c++ World!!!!";
  unsigned char input[19];
 
  int i;
  for(i=0; i<strlen(inS); i++) {
    input[i] = (unsigned) inS[i];
  }
 
  char inHex[39];
  HubUtil::bytesToHex(input, inHex, 19);
 
  cout << "Input hex: " << inHex << endl;
 
  unsigned char output[24];
 
  DES_string_to_key(mKey, &cbKey);
  DES_string_to_key(myIV, &cbIV);
  DES_set_key_unchecked(&cbKey, &kSchedule);
  DES_ncbc_encrypt(input, output, 19, &kSchedule, &cbIV, 1);
 
  cout << "In : " << input << endl;
 
  unsigned char output2[19];
  DES_ncbc_encrypt(output, output2, 24, &kSchedule, &cbIV, 0);
 
  char outHex[39];
  HubUtil::bytesToHex(output2, outHex, 19);
 
  cout << "Decrypted hex: " << outHex << endl;
 
  return 0;
}
=============================================
byteToHex - input char in decimal value: H
byteToHex - input char in decimal value: e
byteToHex - input char in decimal value: l
byteToHex - input char in decimal value: l
byteToHex - input char in decimal value: o
byteToHex - input char in decimal value:  
byteToHex - input char in decimal value: c
byteToHex - input char in decimal value: +
byteToHex - input char in decimal value: +
byteToHex - input char in decimal value:  
byteToHex - input char in decimal value: W
byteToHex - input char in decimal value: o
byteToHex - input char in decimal value: r
byteToHex - input char in decimal value: l
byteToHex - input char in decimal value: d
byteToHex - input char in decimal value: !
byteToHex - input char in decimal value: !
byteToHex - input char in decimal value: !
byteToHex - input char in decimal value: !
Input hex: 48656C6C6F20632B2B20576F726C6421212121
In : Hello c++ World!!!!
byteToHex - input char in decimal value: ¬
byteToHex - input char in decimal value: ¦
byteToHex - input char in decimal value: (
byteToHex - input char in decimal value: e
byteToHex - input char in decimal value: )
byteToHex - input char in decimal value: ^
byteToHex - input char in decimal value: E
byteToHex - input char in decimal value: ó
byteToHex - input char in decimal value: +
byteToHex - input char in decimal value:  
byteToHex - input char in decimal value: W
byteToHex - input char in decimal value: o
byteToHex - input char in decimal value: r
byteToHex - input char in decimal value: l
byteToHex - input char in decimal value: d
byteToHex - input char in decimal value: !
byteToHex - input char in decimal value: !
byteToHex - input char in decimal value: !
byteToHex - input char in decimal value: !
Decrypted hex: ACA62865295E45F32B20576F726C6421212121
=============================================
 
 
Ken Ho
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