> From: [email protected] On Behalf Of Michael S. Zick
> Sent: Sunday, 30 October, 2011 06:36
> On Sun October 30 2011, Ananthasayanan Kandiah wrote:
> > #include <stdio.h>
> > #include <string.h>
> > #include <openssl/aes.h>
> > #include <openssl/bio.h>
> >
> > #define KEY_SIZE 16
> Ask the compiler to help you:
>
> mszick@wolf466:~/crypto$ gcc -Wall -E aes_test.c | grep "_SIZE"
>
> aes_test.c:6:9: error: macro names must be identifiers
> unsigned char key_data[KEY_SIZE] = {
> AES_set_encrypt_key(key_data, KEY_SIZE * 8, &key);
>
I don't know what happened to the message you got,
but I got "#define KEY_SIZE 16" which is a valid identifier,
compiled without error, and gave the symptom reported --
because CRYPTO_cfb128_1_encrypt treats the length as bits
not bytes (apparently only used for AES and Camellia).
97 bits is 12 bytes plus 1 bit, and that 'extra' bit
is 0 and thus 'disappears'.
Note these CFB-1 and CFB-8 modes don't update 'num',
so OP's line 68 is unnecessary (but harmless).
CFB-block (16bytes=128bits) does.
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