[MPlayer-dev-eng] what happened to the blu-ray support

[Reimar Döffinger]

On Mon, Jun 28, 2010 at 12:32:13PM +0200, Alexander Roalter wrote:
> On 27.06.2010 21:26, Alexander Roalter wrote:
> > On 06/27/2010 08:11 PM, Reimar Döffinger wrote:
> >> On Sun, Jun 27, 2010 at 07:35:34PM +0200, Alexander Roalter wrote:
> >>> Jonathan had an update to this patch posted, which I cannot get to work,
> >>> so I'm sticking with this...
> >>
> >> I'd appreciate it if you could get the last one posted to work,
> >> I can try to help debugging any issues.
> >> IIRC the other one was fairly close to ok, whereas this one
> >> hasn't really a chance.
> > I saw in the older thread your notes on the updated patch, trying to
> > integrate these, when I'm trying to get the update running.
> > 
> > Problem with it is that in bd_stream_open of the new version where
> > bd_get_uks(bd) gets called, where the decoding is done with
> > av_aes_crypt, I get from the input buffer the value
> > acb194e94f3c5d69a7d8cfa05b180b22, which then decodes to 0xbf6203fc108f44....
> > 
> > whereas the original reads the input as
> > acb194e94f3c5d69a7d8cfa05b180b22 and decodes to
> > e7317ac00ee7c13f8363da07e0e42a38
> > 
> > 
> > The old (working, with openssl) is
> > 
> > 
> > pos=buf[0]<<24|buf[1]<<16|buf[2]<<8|(buf[3]&0xff);
> > bd->uks.count=buf[pos]<<8|(buf[pos+1]&0xff);
> > bd->uks.keys=malloc(sizeof(struct uk)*bd->uks.count);
> > 
> > for(i=0;i<bd->uks.count;i++) {
> >     int key_pos=pos+i*48+48;
> >     if(key_pos+16<=file_size) {
> >         memcpy( bd->uks.keys[i].enc_key,&buf[key_pos],16);
> >         // dec unit key
> >         AES_KEY aes_key;
> >         AES_set_decrypt_key(bd->vuk, 128, &aes_key);
> >         AES_decrypt(bd->uks.keys[i].enc_key, bd->uks.keys[i].dec_key,
> > &aes_key);
> >     }
> > }
> > 
> > 
> > the new, non working is
> > 
> > pos = AV_RB32(buf);
> > if (pos < file_size) {
> >     bd->uks.count = AV_RB16(&buf[pos]);
> >     bd->uks.keys = calloc(bd->uks.count,sizeof(struct uk));
> > 
> >     a = av_malloc(av_aes_size);
> >     av_aes_init(a, bd->vuk, 128 , 1);
> > 
> >     for (i = 0; i < bd->uks.count; i++) {
> >         int key_pos = pos + i * 48 + 48;
> >         if (key_pos + 16 <= file_size) {
> >             av_aes_crypt(a, bd->uks.keys[i].key, &buf[key_pos], 1, NULL,
> > 1);  // decrypt unit key
> >         }
> >     }
> > }
> > 
> > 
> > pos and bd->uks.count is in both cases 128 and 1, respectively, the VUK
> > is also identical on both.
> > 
> > 
> Even if I enter the key C204905B20C64F997BC855A8353DF9AA and the code
> acb194e94f3c5d69a7d8cfa05b180b22 in some randomly chose
> online-aes-decrypter, I get the correct result:
> 
> http://www.hanewin.net/encrypt/aes/aes-test.htm
> 
> outputs e7317ac00ee7c13f8363da07e0e42a38
> 
> But I don't know how to parametrize the av_aes_crypt to do what they are
> supposed to do... from the docs I don't see anything wrong with it...

Must be something in the surrounding code, below code gives the same
result as you say is correct:
#include <stdio.h>
#include "libavutil/aes.h"

int main(void)
{
    int i;
    const uint8_t key[] = {0xC2, 0x04, 0x90, 0x5B, 0x20, 0xC6, 0x4F, 0x99, 0x7B, 0xC8, 0x55, 0xA8, 0x35, 0x3D, 0xF9, 0xAA};
    const uint8_t code[] = {0xac, 0xb1, 0x94, 0xe9, 0x4f, 0x3c, 0x5d, 0x69, 0xa7, 0xd8, 0xcf, 0xa0, 0x5b, 0x18, 0x0b, 0x22};
    uint8_t dst[16];
    struct AVAES *a = av_malloc(av_aes_size);
    av_aes_init(a, key, 128, 1);
    av_aes_crypt(a, dst, code, 1, NULL, 1);
    for (i = 0; i < 16; i++)
        printf("%x ", dst[i]);
    return 0;
}