AES_cbc_encrypt - data differs on first 16 bytes.

[Koza]

Hi,

I have problem with AES_cbc_encrypt function. I use code you can see below
and unfortunately my function that compares arrays gives an error. The data
from in3 and tmp3 looks similar, but there is a difference on first 16
bytes. Any idea what is going on?

Thank you for your help!!
Best regards,
Koza

Code:

    AES_KEY akey;
    unsigned char in3[48];
    unsigned char out3[48];
    unsigned char tmp3[48];
    unsigned char ivec[16];

    AES_set_encrypt_key(key2,256,&akey);
    AES_cbc_encrypt(in3,out3,48,&akey,ivec,1);

    AES_set_decrypt_key(key2,256,&akey);
    AES_cbc_encrypt(out3,tmp3,48,&akey,ivec,0);

    if (comparearrays(in3,tmp3,48)<0) {printf("\nError!\n");return 0;}
//error all the time! first 16 bytes different!
    return 0;

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