>>char iv[]={ 1, 2, 3, 4, 5, 6, 7, 8 };
>>
>>int do_crypt(char *source, long src_len, char *target, char *key)
>>{
>> int outlen, tmplen;
>> EVP_CIPHER_CTX ctx;
>> EVP_CIPHER_CTX_init(&ctx);
>> EVP_EncryptInit(&ctx, EVP_bf_cbc(), key, iv);
>> /* let's try to extend the key length used!!!! */
>> EVP_CIPHER_CTX_set_key_length(&ctx, 32);
>> if (!EVP_EncryptUpdate(&ctx, target, &outlen, source, src_len+1))
>> return(0);
>> if (!EVP_EncryptFinal(&ctx, target + outlen, &tmplen))
>> return(0);
>> outlen += tmplen;
>> EVP_CIPHER_CTX_cleanup(&ctx);
>> return(outlen);
>>}
>>
>>
>>But when I comment out the key length line, and truncate the key
>>so it's only 16 bytes instead of 32, it returns the same ciphertext.
>>
>>Is it not possible with EVP to change the key size??
>>I've checked the return code of EVP_CIPHER_CTX_set_key_length, and
>>everything looks like it should be working ...
>>
>>I'm using OpenSSL 0.9.6b
>>
>
>
> You need two calls to EVP_EncryptInit if you are changing cipher
> parameters, check the manual pages for more info.
well, I tried calling EVP_EncryptInit again after my set_key_length
call and it did not work ... can you give me an example, as the
man page doesn't not go over this what-so-ever.
-Brad
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