Thread: About 3DES CBC in OpenSSL

Can anyone provide this example for me?
Can anyone tell me what is the meaning of IV? many thanks!!

Code:

char in[bufsize],out[bufsize],back[bufsize],workvec[bufsize];
    des_cblock key1,key2,key3,seed = {0xFE,0xDC,0xBA,0x98,0x76,0x54,0x32,0x10};
    des_key_schedule ks1,ks2,ks3;
    const char *temp="plain text";
    int len=strlen(temp);
    char clear[len+1];
    strcpy(in,temp);
    //strcpy(in,"1 2 3 4 5 6 7 8 9 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");
    des_random_seed(seed);
    des_random_key(key1);
    des_random_key(key2);
    des_random_key(key3);
    des_set_key((C_Block *)key1,ks1);
    des_set_key((C_Block *)key2,ks2);
    des_set_key((C_Block *)key3,ks3);
    /* This work vector can be intialized t anything ...*/
    memset(workvec,0,bufsize);
    des_ede3_cbc_encrypt((C_Block *)in,(C_Block *)out,(long)strlen(in),ks1,ks2,ks3,(C_Block *)workvec,DES_ENCRYPT);

Hi I have found a source code about the 3DES,

Code:

des_cblock key1,key2,key3,seed = {0xFE,0xDC,0xBA,0x98,0x76,0x54,0x32,0x10};

<---what is the meaning the default value, the "des_ramdon_key will not random the key?

Code:

memset(workvec,0,bufsize);

<------workvec is equal to IV?