Comments inline:
On Wed, Sep 02, 2009, Nigel Sollars wrote:
> Hi,
>
> After looking at other examples, decided to go back to basic tried a simple
> approach at taking a string argv and passing that to the enc/dec methods,
> Seems i have the same errorcode as before. I have provided the testfile
> any help with this one would be very much appreciated.
>
>
> unsigned char *iv[8];
> unsigned char *password[16];
Definitions of iv, password are wrong. Get rid of the '*'.
> string = argv[1];
>
> RAND_bytes(iv, 8);
> RAND_bytes(password, 16);
>
> printf("Entering Encryption Stage:\n\n");
> printf("String to encrypt: %s\n\n", string);
>
> EVP_CIPHER_CTX_init(&ectx);
>
>
> EVP_EncryptInit(&ectx, EVP_bf_cbc(), password, iv);
>
> bzero (&enc_inbuf, input_buf_size);
>
> if(!EVP_EncryptUpdate(&ectx, enc_outbuf, &encoutlen, string,
> strlen(string)))
> {
> printf("Error whilst EncryptUpdate\n");
> return 0;
> }
>
> if(!EVP_EncryptFinal(&ectx, enc_outbuf + encoutlen, &enctotallen))
> {
> printf("Error Whilst EncryptFinal\n");
> return 0;
> }
>
> encoutlen += enctotallen;
>
OK, you've got the total length of the encrypted data as "encoutlen" at this
point.
> printf("Encryption Successful\n\n");
> printf("Entering Decryption Stage\n\n");
>
> EVP_CIPHER_CTX_init(&dctx);
> EVP_DecryptInit(&dctx, EVP_bf_cbc(), password, iv);
>
> bzero (&dec_inbuf, output_buf_size);
> bzero (&dec_outbuf, input_buf_size);
>
> if (!(EVP_DecryptUpdate(&dctx, dec_outbuf, &decoutlen, enc_outbuf,
> output_buf_size)))
> {
> printf("Error Whilst DecryptUpdate\n");
> return 0;
> }
>
But above you are passing the length as output_buf_size.
Steve.
--
Dr Stephen N. Henson. OpenSSL project core developer.
Commercial tech support now available see: http://www.openssl.org
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