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Uses a simpler way to compute the multiplicative inverse.

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This commit is contained in:
Andrea Mazzoleni 2013-09-09 19:12:33 +02:00
parent ff4f080282
commit 7f35356bb1
1 changed files with 6 additions and 6 deletions
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12
mktables.c
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@ -41,8 +41,7 @@ unsigned char gfmul(unsigned char a, unsigned char b)
int main(void)
{
unsigned char pow2[256];
unsigned char log2[256];
unsigned char gfinv[256];
unsigned char v;
int i, j;
@ -54,7 +53,10 @@ int main(void)
for(j=0;j<256;++j) {
if (j % 8 == 0)
printf("\t\t");
printf("0x%02x,", gfmul(i, j));
v = gfmul(i, j);
if (v == 1)
gfinv[i] = j;
printf("0x%02x,", (unsigned)v);
if (j % 8 == 7)
printf("\n");
else
@ -71,8 +73,6 @@ int main(void)
for(i=0;i<256;++i) {
if (i % 8 == 0)
printf("\t");
pow2[i] = v;
log2[pow2[i]] = i;
printf("0x%02x,", v);
v = gfmul(v, 2);
if (i % 8 == 7)
@ -108,7 +108,7 @@ int main(void)
if (i == 0)
v = 0;
else
v = pow2[255 - log2[i]];
v = gfinv[i];
printf("0x%02x,", v);
if (i % 8 == 7)
printf("\n");