/*
* Setup state for decoding a strip.
*/
int
DECLARE1(FaxPreDecode, TIFF*, tif)
{
Fax3DecodeState *sp = &fax;
sp->b.bit = 0; /* force initial read */
sp->b.data = 0;
sp->b.tag = G3_1D;
if (sp->b.refline)
bset(sp->b.refline, sp->b.rowbytes, sp->b.white ? 0xff : 0x00);
/*
* If image has EOL codes, they precede each line
* of data. We skip over the first one here so that
* when we decode rows, we can use an EOL to signal
* that less than the expected number of pixels are
* present for the scanline.
*/
if ((fax.options & FAX3_NOEOL) == 0) {
skiptoeol(tif, 0);
if (is2DEncoding(tif))
/* tag should always be 1D! */
sp->b.tag = nextbit(tif) ? G3_1D : G3_2D;
}
return (1);
}
void
format_message2(unsigned char *in, int length, unsigned char out[26])
{
int i,j;
unsigned char M1[20], M2[20];
unsigned char V[23];
crypto_hash_sha1(M1,in,length / 8);
crypto_hash_sha1(M2,M1,160 / 8);
/* calcule V sur 182 bits soit 22.75 octets*/
memset(V,33,0);
for(i=0;i<20;i++)
{
V[i] = M1[i];
}
V[20] = M2[0];
V[21] = M2[1];
V[22] = (unsigned char) (M2[2] & 0xFC);
for(i=0,j=0;i<26;i++)
{
out[i] = 0;
out[i] ^= 64 * nextbit(V,&j);
out[i] ^= 32 * nextbit(V,&j);
out[i] ^= 16 * nextbit(V,&j);
out[i] ^= 8 * nextbit(V,&j);
out[i] ^= 4 * nextbit(V,&j);
out[i] ^= 2 * nextbit(V,&j);
out[i] ^= 1 * nextbit(V,&j);
}
}
void
format_message1(const unsigned char *in, int length, unsigned char out[37], unsigned char delta[11])
{
int i,j;
unsigned char M1[20], M2[20], W[20];
unsigned char V[33];
crypto_hash_sha1(M1,in,length / 8);
crypto_hash_sha1(M2,M1,160 / 8);
/* calcule V sur 182 bits soit 22.75 octets*/
memset(V,33,0);
for(i=0;i<20;i++)
{
V[i] = M1[i];
}
V[20] = M2[0];
V[21] = M2[1];
V[22] = (unsigned char) (M2[2] & 0xFC);
V[22] |= delta[0];
for(i=23;i<33;i++)
{
V[i] = delta[i-22];
}
crypto_hash_sha1(W,V,33);
for(i=0,j=0;i<26;i++)
{
out[i] = 0;
out[i] ^= 64 * nextbit(V,&j);
out[i] ^= 32 * nextbit(V,&j);
out[i] ^= 16 * nextbit(V,&j);
out[i] ^= 8 * nextbit(V,&j);
out[i] ^= 4 * nextbit(V,&j);
out[i] ^= 2 * nextbit(V,&j);
out[i] ^= 1 * nextbit(V,&j);
}
for(i=26,j=0;i<37;i++)
{
out[i] = 0;
out[i] ^= 64 * nextbit(W,&j);
out[i] ^= 32 * nextbit(W,&j);
out[i] ^= 16 * nextbit(W,&j);
out[i] ^= 8 * nextbit(W,&j);
out[i] ^= 4 * nextbit(W,&j);
out[i] ^= 2 * nextbit(W,&j);
out[i] ^= 1 * nextbit(W,&j);
}
}
