rgb_color AmTrackDataView::EventColor(uint8 velocity)
{
if (velocity >= 127) return mEventColor;
if (velocity <= 0) return mLowEventColor;
rgb_color c;
mix_in(mLowEventColor, mEventColor, (float)velocity / 127, c);
return c;
}
void AmTrackDataView::DrawTrack(const AmTrack* track,
BRect clip,
BView* view,
int32 properties,
AmSelectionsI* selections)
{
AmTime start = mMtc.PixelToTick(clip.left - 2);
AmTime end = mMtc.PixelToTick(clip.right + 2);
AmNode* n = track->Phrases().HeadNode();
while (n && n->Event() && n->StartTime() <= end) {
if (n->EndTime() >= start) {
if (n->Event()->Type() == n->Event()->PHRASE_TYPE) {
AmPhraseEvent* pe = dynamic_cast<AmPhraseEvent*>( n->Event() );
if (pe && pe->Phrase() ) {
mEventColor = pe->Phrase()->Color(AmPhrase::FOREGROUND_C);
mix_in(mEventColor, AmPrefs().Color(AM_DATA_BG_C), 0.75, mLowEventColor);
DrawPhrase(clip, view, track->Id(), *pe, pe, start, end, properties, selections);
}
}
}
n = n->next;
}
}
int crypto_aead_decrypt(
unsigned char *m,unsigned long long *outputmlen,
unsigned char *nsec,
const unsigned char *c,unsigned long long clen,
const unsigned char *ad,unsigned long long adlen,
const unsigned char *npub,
const unsigned char *k
)
{
u64 mlen, n, origmlen, start ;
const byte *ptr, *origc;
byte temp[AES_BYTES], *p ;
int i ;
assert( m != NULL ) ;
assert( outputmlen != NULL ) ;
assert( c != NULL ) ;
assert( ad != NULL ) ;
assert( npub != NULL ) ;
assert( k != NULL ) ;
if( clen < AUTH_BYTES) return -1;
/* where auth data should be */
mlen = clen - AUTH_BYTES ;
ptr = c + mlen ;
*outputmlen = mlen;
setup(mlen, adlen, npub, k) ;
do_additional( ad, adlen ) ;
origc = c;
origmlen = mlen;
#ifdef TESTING
printf("decrypt: total %llu text %llu ad %llu\n", clen, mlen, adlen ) ;
printf("decrypt: ciphertext starts with %08xu\n", ((u32 *) origc)[0] ) ;
printf("decrypt: starting authentication check %08x\n", ((u32 *) ptr)[0] ) ;
#endif
/*
authenticate
*/
start = mlen ;
while( (mlen > 0) && (mlen <= start) ) {
n = (u64) ((mlen >= AES_BYTES) ? AES_BYTES : mlen) ;
addmul( (byte *) accum, c, n, (byte *) H) ;
c += n;
mlen -= n;
}
if( mlen > start ) {
#ifdef TESTING
printf("decrypt: mlen out of bounds\n" ) ;
#endif
return -2 ;
}
#ifdef TESTING
printf("decrypt: auth before finalisation %08x %08x\n", accum[0], accum[1] ) ;
#endif
mix_in(finalblock) ;
xor_128( accum, I ) ;
/* see if we have a match */
if( memcmp((void *) accum, (void *) ptr, AUTH_BYTES) != 0) {
#ifdef TESTING
printf("decrypt: auth failed, result here %08x\n", accum[0] ) ;
#endif
return -3;
}
#ifdef TESTING
printf("decrypt: auth matched, going to decrypt\n" ) ;
printf("decrypt: 1st ciphertext word %08x\n", *((u32 *) c) ) ;
#endif
/*
reset things
start encryption with correct ChaCha state
*/
c = origc;
mlen = origmlen;
setup(mlen, adlen, npub, k) ;
/*
decrypt, simpler than encryption
no authentication to do
*/
start = mlen ;
while( (mlen > 0) && (mlen <= start) ) {
n = (u64) ((mlen >= AES_BYTES)? AES_BYTES : mlen) ;
white_aes( temp ) ;
for( i = 0, p = temp ; i < n ; i++, c++, m++, p++ )
*m = *c ^ *p ;
mlen -= n;
}
if( mlen > start ) {
#ifdef TESTING
printf("decrypt: mlen out of bounds\n" ) ;
#endif
return -2 ;
}
#ifdef TESTING
printf("decrypt: reached end, showing first words\n" ) ;
printf("plaintext %08x ciphertext %08x auth %08x\n",*((u32 *) m), *((u32 *) c), accum[0] ) ;
#endif
memset( temp, 0, AES_BYTES ) ;
cleanup() ;
return 0;
}
/*
declarations for this and decrypt
copied from Bernstein's example AES-GCM code
to be sure they match test framework
*/
int crypto_aead_encrypt(
unsigned char *c,unsigned long long *clen,
const unsigned char *m, unsigned long long mlen,
const unsigned char *ad,unsigned long long adlen,
const unsigned char *nsec,
const unsigned char *npub,
const unsigned char *k
)
{
u64 n, start ;
byte temp[AES_BYTES] ;
byte *p, *q, *ptr ;
int i ;
#ifdef TESTING
byte *origm, *origc ;
assert( c != NULL ) ;
/* are framework declarations compatible with mine? */
assert( sizeof(long long) == sizeof( u64) ) ;
printf("encrypt: plaintext %llu ad %llu\n", mlen, adlen ) ;
origm = m ;
origc = c ;
#endif
/*
Bernstein's example aes-gcm code sets *clen
I copy that, assuming the interface needs it
*/
*clen = mlen+AUTH_BYTES ;
/* address for authentication data */
ptr = c + mlen ;
/* key schedule */
setup( mlen, (u64) adlen, npub, k) ;
/* data authenticated but not encrypted */
do_additional( ad, (u64) adlen ) ;
/*
encryption
mlen is unsigned so always > = 0
use start for an error check
*/
start = mlen ;
while( (mlen != 0) && (mlen <= start) ) {
n = (u64) ((mlen >= AES_BYTES)? AES_BYTES : mlen) ;
white_aes( temp ) ;
for( i = 0, p = temp, q = c ; i < n ; i++, q++, m++, p++ )
*q = *m ^ *p ;
addmul( (byte *) accum, c, n, (byte *) H) ;
mlen -= n;
c += n ;
}
if( mlen > start ) {
#ifdef TESTING
printf("encrypt: mlen out of bounds\n" ) ;
#endif
return -2 ;
}
#ifdef TESTING
printf("encrypt: auth before finalisation %08x %08x\n", accum[0], accum[1] ) ;
#endif
/*
finish authentication
*/
mix_in(finalblock) ;
xor_128( accum, I ) ;
memcpy( ptr, (void *) accum, AES_BYTES ) ;
#ifdef TESTING
printf("encrypt: reached end, showing first words\n" ) ;
printf("plaintext %08x ciphertext %08x auth %08x\n", *((u32 *) origm), *((u32 *) origc), accum[0] ) ;
#endif
memset( temp, 0, AES_BYTES ) ;
cleanup() ;
return 0 ;
}
