[cs631apue] How to use iv xor with first block of text

[Kun Yao]

    here is my code

    EVP_CIPHER *cipher;
    EVP_MD *dgst = NULL;
    char *password = "password";
    char *salt = "salt";

    OpenSSL_add_all_algorithms();

    if(!(cipher = EVP_get_cipherbyname("aes-256-cbc"))) {
    fprintf(stderr, "no such cipher\n");
    exit (EXIT_FAILURE);
    }

    if(!(dgst=EVP_get_digestbyname("sha1"))){
    fprintf(stderr, "no such digest\n");
    exit (EXIT_FAILURE);
    }

    if(!EVP_BytesToKey(cipher, dgst, (unsigned char *)salt, (unsigned char
*) password,
        strlen(password), 1, key, iv)){
        fprintf(stderr, "EVP_BytesToKey failed\n");
        exit (EXIT_FAILURE);
    }
    printf("Key: "); for(i=0; i<cipher->key_len; ++i) { printf("%02X",
key[i]); } printf("\n");
    printf("IV:  "); for(i=0; i<cipher->iv_len; ++i) { printf("%02X",
iv[i]); } printf("\n");


  I get:

Key:32  77a620512acc466929365e66cd642a9dd6bda657a43d15e94827fe0f2ea2d3ab

IV: 16  0ad8a976d716941149a7a1526e9f4dee


-Kun


On Sun, Dec 8, 2013 at 2:05 PM, Jan Schaumann <jschauma at stevens.edu> wrote:

> Kun Yao <kyao at stevens.edu> wrote:
> > Hi, I have following problem in initialisation vector(IV) XOR with first
> > block of text,
>
> Can you post the relevant code excerpts?
>
> What are the specific function calls that are failing and what are the
> errors they are returning?
>
> -Jan
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