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Hi all,
I am using triple-DES to encrypt and decrypt a string. The openssl function
that I call is: des_ede3_cbc_encrypt. I set an IV, and 3 keys for this
purpose. I have taken some help from "destest.c" supplied with the
distribution.
The amazing thing is: the encryption/decryption is not working for only 1
input string, for all other input string (as far as I could test), it is
working. I am on "OpenSSL 0.9.8g 19 Oct 2007".
Example1:
[EMAIL PROTECTED] crypt]$ ./tdes 1196075759^10.77.199.189^R^user1k1
Encrypted/Decrypted string is: [1196075759^10.77.199.18]
Result: Not working, it is not giving complete output.
Example2:
[EMAIL PROTECTED] crypt]$ ./tdes 1196075758^10.77.199.189^R^user1k1
Encrypted/Decrypted string is: [1196075758^10.77.199.189^R^user1k1]
Result: Working, it is giving complete output. (The input sting is different
from the first one: 119607575*8*)
For all examples that I tried, the only failure is with the Example 1 above.
*All* others passed. Is there some bug with the function, or am I missing
something?
A minimal program that demonstrates this strange behaviour is given below.
// Command line usage: <program> InputString
// Output: Same string, being encrypted and then decrypted.
// It checks for argc (command line) - all those are not shown in this
minimal example.
#include <openssl/des.h>
#define BUFSIZE 1024
int main(int argc, char *argv[])
{
unsigned char out[BUFSIZE]={0};
cryptWrapper((unsigned char*)argv[1], out);
printf("Encrypted/Decrypted string is: [%s]\n", out);
return 0;
}
int cryptWrapper(unsigned char *in, unsigned char *out)
{
unsigned char EncrOut[BUFSIZE]={0};
unsigned char DecrOut[BUFSIZE]={0};
unsigned char tdesKey1[8] =
{0x01,0x23,0x45,0x67,0x89,0xab,0xcd,0xef};
unsigned char tdesKey2[8] =
{0xf1,0xe0,0xd3,0xc2,0xb5,0xa4,0x97,0x86};
unsigned char tdesKey3[8] =
{0xfe,0xdc,0xba,0x98,0x76,0x54,0x32,0x10};
unsigned char initVector[8] =
{0xfe,0xdc,0xba,0x98,0x76,0x54,0x32,0x10}; // The initialization
vector
des_key_schedule kSched1, kSched2, kSched3;
des_cblock iv;
memcpy(iv,initVector,sizeof(initVector)); // set the
initialization
vector
DES_set_key_checked(&tdesKey1, &kSched1); // set the key
schedule
DES_set_key_checked(&tdesKey2, &kSched2); // set the key
schedule
DES_set_key_checked(&tdesKey3, &kSched3); // set the key
schedule
memset(out, 0, BUFSIZE);
des_ede3_cbc_encrypt(in, EncrOut, (long)strlen((char*)in), kSched1,
kSched2, kSched3, &iv, DES_ENCRYPT); // Encrypt
memcpy(iv,initVector,sizeof(initVector));
DES_set_key_checked(&tdesKey1, &kSched1);
DES_set_key_checked(&tdesKey2, &kSched2);
DES_set_key_checked(&tdesKey3, &kSched3);
des_ede3_cbc_encrypt((unsigned char*)EncrOut, DecrOut,
(long)strlen((char*)EncrOut)+1, kSched1, kSched2, kSched3, &iv,
DES_DECRYPT);
strcpy((char *) out, (char *) DecrOut);
return 0;
}
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