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switching from length_B to length_W which is more precise

This commit is contained in:
bg 2012-09-18 17:40:36 +02:00
parent 4702ee6467
commit 6130055cd5
3 changed files with 142 additions and 142 deletions
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264
bigint/bigint.c
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@ -61,16 +61,16 @@
/******************************************************************************/
void bigint_adjust(bigint_t* a){
while(a->length_B!=0 && a->wordv[a->length_B-1]==0){
a->length_B--;
while(a->length_W!=0 && a->wordv[a->length_W-1]==0){
a->length_W--;
}
if(a->length_B==0){
if(a->length_W==0){
a->info=0;
return;
}
bigint_word_t t;
uint8_t i = BIGINT_WORD_SIZE-1;
t = a->wordv[a->length_B-1];
t = a->wordv[a->length_W-1];
while((t&(1L<<(BIGINT_WORD_SIZE-1)))==0 && i){
t<<=1;
i--;
@ -81,25 +81,25 @@ void bigint_adjust(bigint_t* a){
/******************************************************************************/
uint16_t bigint_length_b(const bigint_t* a){
if(!a->length_B || a->length_B==0){
if(!a->length_W || a->length_W==0){
return 0;
}
return (a->length_B-1) * BIGINT_WORD_SIZE + GET_FBS(a);
return (a->length_W-1) * BIGINT_WORD_SIZE + GET_FBS(a);
}
/******************************************************************************/
uint16_t bigint_length_B(const bigint_t* a){
return a->length_B * sizeof(bigint_word_t);
return a->length_W * sizeof(bigint_word_t);
}
/******************************************************************************/
uint32_t bigint_get_first_set_bit(const bigint_t* a){
if(a->length_B==0){
if(a->length_W==0){
return (uint32_t)(-1);
}
return (a->length_B-1)*sizeof(bigint_word_t)*8+GET_FBS(a);
return (a->length_W-1)*sizeof(bigint_word_t)*8+GET_FBS(a);
}
@ -109,10 +109,10 @@ uint32_t bigint_get_last_set_bit(const bigint_t* a){
uint32_t r=0;
uint8_t b=0;
bigint_word_t x=1;
if(a->length_B==0){
if(a->length_W==0){
return (uint32_t)(-1);
}
while(a->wordv[r]==0 && r<a->length_B){
while(a->wordv[r]==0 && r<a->length_W){
++r;
}
if(a->wordv[r] == 0){
@ -128,8 +128,8 @@ uint32_t bigint_get_last_set_bit(const bigint_t* a){
/******************************************************************************/
void bigint_copy(bigint_t* dest, const bigint_t* src){
memcpy(dest->wordv, src->wordv, src->length_B*sizeof(bigint_word_t));
dest->length_B = src->length_B;
memcpy(dest->wordv, src->wordv, src->length_W*sizeof(bigint_word_t));
dest->length_W = src->length_W;
dest->info = src->info;
}
@ -139,17 +139,17 @@ void bigint_copy(bigint_t* dest, const bigint_t* src){
void bigint_add_u(bigint_t* dest, const bigint_t* a, const bigint_t* b){
uint16_t i;
bigint_wordplus_t t=0LL;
if(a->length_B < b->length_B){
if(a->length_W < b->length_W){
XCHG_PTR(a,b);
}
for(i=0; i<b->length_B; ++i){
for(i=0; i<b->length_W; ++i){
// t = (bigint_wordplus_t)(a->wordv[i]) + (bigint_wordplus_t)(b->wordv[i]) + t;
t += a->wordv[i];
t += b->wordv[i];
dest->wordv[i] = (bigint_word_t)t;
t>>=BIGINT_WORD_SIZE;
}
for(; i<a->length_B; ++i){
for(; i<a->length_W; ++i){
t += a->wordv[i];
dest->wordv[i] = (bigint_word_t)t;
t>>=BIGINT_WORD_SIZE;
@ -157,7 +157,7 @@ void bigint_add_u(bigint_t* dest, const bigint_t* a, const bigint_t* b){
if(t){
dest->wordv[i++] = (bigint_word_t)t;
}
dest->length_B = i;
dest->length_W = i;
bigint_adjust(dest);
}
@ -165,7 +165,7 @@ void bigint_add_u(bigint_t* dest, const bigint_t* a, const bigint_t* b){
/* this should be implemented in assembly */
void bigint_add_scale_u(bigint_t* dest, const bigint_t* a, uint16_t scale){
if(a->length_B == 0){
if(a->length_W == 0){
return;
}
if(scale == 0){
@ -174,39 +174,39 @@ void bigint_add_scale_u(bigint_t* dest, const bigint_t* a, uint16_t scale){
}
bigint_t x;
#if BIGINT_WORD_SIZE == 8
memset(dest->wordv + dest->length_B, 0, MAX(dest->length_B, a->length_B + scale) - dest->length_B);
memset(dest->wordv + dest->length_W, 0, MAX(dest->length_W, a->length_W + scale) - dest->length_W);
x.wordv = dest->wordv + scale;
x.length_B = dest->length_B - scale;
if((int16_t)x.length_B < 0){
x.length_B = 0;
x.length_W = dest->length_W - scale;
if((int16_t)x.length_W < 0){
x.length_W = 0;
x.info = 0;
} else {
x.info = dest->info;
}
bigint_add_u(&x, &x, a);
dest->length_B = x.length_B + scale;
dest->length_W = x.length_W + scale;
dest->info = 0;
bigint_adjust(dest);
#else
bigint_t s;
uint16_t word_shift = scale / sizeof(bigint_word_t), byte_shift = scale % sizeof(bigint_word_t);
bigint_word_t bv[a->length_B + 1];
bigint_word_t bv[a->length_W + 1];
s.wordv = bv;
bv[0] = bv[a->length_B] = 0;
memcpy((uint8_t*)bv + byte_shift, a->wordv, a->length_B * sizeof(bigint_word_t));
s.length_B = a->length_B + 1;
bv[0] = bv[a->length_W] = 0;
memcpy((uint8_t*)bv + byte_shift, a->wordv, a->length_W * sizeof(bigint_word_t));
s.length_W = a->length_W + 1;
bigint_adjust(&s);
memset(dest->wordv + dest->length_B, 0, (MAX(dest->length_B, s.length_B + word_shift) - dest->length_B) * sizeof(bigint_word_t));
memset(dest->wordv + dest->length_W, 0, (MAX(dest->length_W, s.length_W + word_shift) - dest->length_W) * sizeof(bigint_word_t));
x.wordv = dest->wordv + word_shift;
x.length_B = dest->length_B - word_shift;
if((int16_t)x.length_B < 0){
x.length_B = 0;
x.length_W = dest->length_W - word_shift;
if((int16_t)x.length_W < 0){
x.length_W = 0;
x.info = 0;
}else{
x.info = dest->info;
}
bigint_add_u(&x, &x, &s);
dest->length_B = x.length_B + word_shift;
dest->length_W = x.length_W + word_shift;
dest->info = 0;
bigint_adjust(dest);
#endif
@ -217,29 +217,29 @@ void bigint_add_scale_u(bigint_t* dest, const bigint_t* a, uint16_t scale){
bigint_word_t *dst;
bigint_wordplus_t t=0;
scale_w = (scale+sizeof(bigint_word_t)-1)/sizeof(bigint_word_t);
if(scale>dest->length_B*sizeof(bigint_word_t)){
memset(((uint8_t*)dest->wordv)+dest->length_B*sizeof(bigint_word_t), 0, scale-dest->length_B*sizeof(bigint_word_t));
if(scale>dest->length_W*sizeof(bigint_word_t)){
memset(((uint8_t*)dest->wordv)+dest->length_W*sizeof(bigint_word_t), 0, scale-dest->length_W*sizeof(bigint_word_t));
}
// a->wordv = (const uint32_t*)(((uint8_t*)a->wordv)+(scale&3));
dst = dest->wordv + (scale&(sizeof(bigint_word_t)-1));
for(i=scale/sizeof(bigint_word_t); i<a->length_B+scale_w; ++i,++j){
for(i=scale/sizeof(bigint_word_t); i<a->length_W+scale_w; ++i,++j){
t += a->wordv[j];
if(dest->length_B>i){
if(dest->length_W>i){
t += dst[i];
}
dst[i] = (bigint_word_t)t;
t>>=BIGINT_WORD_SIZE;
}
while(t){
if(dest->length_B>i){
if(dest->length_W>i){
t += dst[i];
}
dst[i] = (bigint_word_t)t;
t>>=BIGINT_WORD_SIZE;
++i;
}
if(dest->length_B < i){
dest->length_B = i;
if(dest->length_W < i){
dest->length_W = i;
}
bigint_adjust(dest);
*/
@ -253,19 +253,19 @@ void bigint_sub_u(bigint_t* dest, const bigint_t* a, const bigint_t* b){
int8_t r;
bigint_wordplus_signed_t t=0LL;
uint16_t i, min, max;
min = MIN(a->length_B, b->length_B);
max = MAX(a->length_B, b->length_B);
min = MIN(a->length_W, b->length_W);
max = MAX(a->length_W, b->length_W);
r = bigint_cmp_u(a,b);
if(r==0){
bigint_set_zero(dest);
return;
}
if(b->length_B==0){
if(b->length_W==0){
bigint_copy(dest, a);
SET_POS(dest);
return;
}
if(a->length_B==0){
if(a->length_W==0){
bigint_copy(dest, b);
SET_NEG(dest);
return;
@ -289,24 +289,24 @@ void bigint_sub_u(bigint_t* dest, const bigint_t* a, const bigint_t* b){
}
}
SET_POS(dest);
dest->length_B = i;
dest->length_W = i;
bigint_adjust(dest);
}
/******************************************************************************/
int8_t bigint_cmp_u(const bigint_t* a, const bigint_t* b){
if(a->length_B > b->length_B){
if(a->length_W > b->length_W){
return 1;
}
if(a->length_B < b->length_B){
if(a->length_W < b->length_W){
return -1;
}
if(a->length_B==0){
if(a->length_W==0){
return 0;
}
uint16_t i;
i = a->length_B-1;
i = a->length_W-1;
do{
if(a->wordv[i] != b->wordv[i]){
if(a->wordv[i] > b->wordv[i]){
@ -376,7 +376,7 @@ void bigint_sub_s(bigint_t* dest, const bigint_t* a, const bigint_t* b){
int8_t bigint_cmp_s(const bigint_t* a, const bigint_t* b){
uint8_t s;
if(a->length_B==0 && b->length_B==0){
if(a->length_W==0 && b->length_W==0){
return 0;
}
s = GET_SIGN(a)?2:0;
@ -414,15 +414,15 @@ void bigint_shiftleft(bigint_t* a, uint16_t shift){
byteshift = shift/8;
bitshift = shift&7;
for(i=0;i<=byteshift/sizeof(bigint_word_t); ++i){
a->wordv[a->length_B+i] = 0;
a->wordv[a->length_W+i] = 0;
}
if(byteshift){
memmove(((uint8_t*)a->wordv) + byteshift, a->wordv, a->length_B * sizeof(bigint_word_t));
memmove(((uint8_t*)a->wordv) + byteshift, a->wordv, a->length_W * sizeof(bigint_word_t));
memset(a->wordv, 0, byteshift);
}
p = a->wordv + byteshift / sizeof(bigint_word_t);
words_to_shift = a->length_B + (byteshift % sizeof(bigint_word_t)?1:0);
word_alloc = a->length_B + (byteshift + sizeof(bigint_word_t) - 1) / sizeof(bigint_word_t) + 1;
words_to_shift = a->length_W + (byteshift % sizeof(bigint_word_t)?1:0);
word_alloc = a->length_W + (byteshift + sizeof(bigint_word_t) - 1) / sizeof(bigint_word_t) + 1;
a->wordv[word_alloc-1]=0;
if(bitshift!=0){
for(i=0; i < words_to_shift; ++i){
@ -432,7 +432,7 @@ void bigint_shiftleft(bigint_t* a, uint16_t shift){
}
p[i] = (bigint_word_t)t;
}
a->length_B = word_alloc;
a->length_W = word_alloc;
bigint_adjust(a);
}
@ -445,23 +445,23 @@ void bigint_shiftright(bigint_t* a, uint16_t shift){
bigint_wordplus_t t=0;
byteshift = shift/8;
bitshift = shift&7;
if(byteshift >= a->length_B * sizeof(bigint_word_t)){ /* we would shift out more than we have */
if(byteshift >= a->length_W * sizeof(bigint_word_t)){ /* we would shift out more than we have */
bigint_set_zero(a);
return;
}
if(byteshift == a->length_B * sizeof(bigint_word_t) - 1 && bitshift > GET_FBS(a)){
if(byteshift == a->length_W * sizeof(bigint_word_t) - 1 && bitshift > GET_FBS(a)){
bigint_set_zero(a);
return;
}
if(byteshift){
memmove(a->wordv, (uint8_t*)a->wordv + byteshift, a->length_B * sizeof(bigint_word_t) - byteshift);
memset((uint8_t*)a->wordv + a->length_B * sizeof(bigint_word_t) - byteshift, 0, byteshift);
memmove(a->wordv, (uint8_t*)a->wordv + byteshift, a->length_W * sizeof(bigint_word_t) - byteshift);
memset((uint8_t*)a->wordv + a->length_W * sizeof(bigint_word_t) - byteshift, 0, byteshift);
}
byteshift /= sizeof(bigint_word_t);
a->length_B -= (byteshift + sizeof(bigint_word_t) - 1) / sizeof(bigint_word_t);
if(bitshift != 0 && a->length_B){
a->length_W -= (byteshift + sizeof(bigint_word_t) - 1) / sizeof(bigint_word_t);
if(bitshift != 0 && a->length_W){
/* shift to the right */
i = a->length_B - 1;
i = a->length_W - 1;
do{
t |= ((bigint_wordplus_t)(a->wordv[i])) << (BIGINT_WORD_SIZE - bitshift);
a->wordv[i] = (bigint_word_t)(t >> BIGINT_WORD_SIZE);
@ -475,7 +475,7 @@ void bigint_shiftright(bigint_t* a, uint16_t shift){
void bigint_xor(bigint_t* dest, const bigint_t* a){
uint16_t i;
for(i=0; i<a->length_B; ++i){
for(i=0; i<a->length_W; ++i){
dest->wordv[i] ^= a->wordv[i];
}
bigint_adjust(dest);
@ -484,7 +484,7 @@ void bigint_xor(bigint_t* dest, const bigint_t* a){
/******************************************************************************/
void bigint_set_zero(bigint_t* a){
a->length_B=0;
a->length_W=0;
}
/******************************************************************************/
@ -492,74 +492,74 @@ void bigint_set_zero(bigint_t* a){
/* using the Karatsuba-Algorithm */
/* x*y = (xh*yh)*b**2n + ((xh+xl)*(yh+yl) - xh*yh - xl*yl)*b**n + yh*yl */
void bigint_mul_u(bigint_t* dest, const bigint_t* a, const bigint_t* b){
if(a->length_B==0 || b->length_B==0){
if(a->length_W==0 || b->length_W==0){
bigint_set_zero(dest);
return;
}
if(dest==a || dest==b){
bigint_t d;
bigint_word_t d_b[a->length_B+b->length_B];
bigint_word_t d_b[a->length_W+b->length_W];
d.wordv = d_b;
bigint_mul_u(&d, a, b);
bigint_copy(dest, &d);
return;
}
if(a->length_B==1 || b->length_B==1){
if(a->length_B!=1){
if(a->length_W==1 || b->length_W==1){
if(a->length_W!=1){
XCHG_PTR(a,b);
}
bigint_wordplus_t t=0;
uint16_t i;
bigint_word_t x = a->wordv[0];
for(i=0; i < b->length_B; ++i){
for(i=0; i < b->length_W; ++i){
t += ((bigint_wordplus_t)b->wordv[i])*((bigint_wordplus_t)x);
dest->wordv[i] = (bigint_word_t)t;
t>>=BIGINT_WORD_SIZE;
}
dest->wordv[i] = (bigint_word_t)t;
dest->length_B = i+1;
dest->length_W = i+1;
dest->info = 0;
bigint_adjust(dest);
return;
}
if(a->length_B * sizeof(bigint_word_t) <= 4 && b->length_B * sizeof(bigint_word_t) <= 4){
if(a->length_W * sizeof(bigint_word_t) <= 4 && b->length_W * sizeof(bigint_word_t) <= 4){
uint32_t p=0, q=0;
uint64_t r;
memcpy(&p, a->wordv, a->length_B*sizeof(bigint_word_t));
memcpy(&q, b->wordv, b->length_B*sizeof(bigint_word_t));
memcpy(&p, a->wordv, a->length_W*sizeof(bigint_word_t));
memcpy(&q, b->wordv, b->length_W*sizeof(bigint_word_t));
r = (uint64_t)p * (uint64_t)q;
memcpy(dest->wordv, &r, (dest->length_B = a->length_B + b->length_B)*sizeof(bigint_word_t));
memcpy(dest->wordv, &r, (dest->length_W = a->length_W + b->length_W)*sizeof(bigint_word_t));
bigint_adjust(dest);
return;
}
bigint_set_zero(dest);
/* split a in xh & xl; split b in yh & yl */
const uint16_t n = (MAX(a->length_B, b->length_B)+1)/2;
const uint16_t n = (MAX(a->length_W, b->length_W)+1)/2;
bigint_t xl, xh, yl, yh;
xl.wordv = a->wordv;
yl.wordv = b->wordv;
if(a->length_B<=n){
if(a->length_W<=n){
bigint_set_zero(&xh);
xl.length_B = a->length_B;
xl.length_W = a->length_W;
xl.info = a->info;
}else{
xl.length_B=n;
xl.length_W=n;
xl.info = 0;
bigint_adjust(&xl);
xh.wordv = &(a->wordv[n]);
xh.length_B = a->length_B-n;
xh.length_W = a->length_W-n;
xh.info = a->info;
}
if(b->length_B<=n){
if(b->length_W<=n){
bigint_set_zero(&yh);
yl.length_B = b->length_B;
yl.length_W = b->length_W;
yl.info = b->info;
}else{
yl.length_B=n;
yl.length_W=n;
yl.info = 0;
bigint_adjust(&yl);
yh.wordv = &(b->wordv[n]);
yh.length_B = b->length_B-n;
yh.length_W = b->length_W-n;
yh.info = b->info;
}
/* now we have split up a and b */
@ -617,33 +617,33 @@ void bigint_mul_s(bigint_t* dest, const bigint_t* a, const bigint_t* b){
/* square */
/* (xh*b^n+xl)^2 = xh^2*b^2n + 2*xh*xl*b^n + xl^2 */
void bigint_square(bigint_t* dest, const bigint_t* a){
if(a->length_B*sizeof(bigint_word_t)<=4){
if(a->length_W*sizeof(bigint_word_t)<=4){
uint64_t r=0;
memcpy(&r, a->wordv, a->length_B*sizeof(bigint_word_t));
memcpy(&r, a->wordv, a->length_W*sizeof(bigint_word_t));
r = r*r;
memcpy(dest->wordv, &r, 2*a->length_B*sizeof(bigint_word_t));
memcpy(dest->wordv, &r, 2*a->length_W*sizeof(bigint_word_t));
SET_POS(dest);
dest->length_B=2*a->length_B;
dest->length_W=2*a->length_W;
bigint_adjust(dest);
return;
}
if(dest==a){
bigint_t d;
bigint_word_t d_b[a->length_B*2];
bigint_word_t d_b[a->length_W*2];
d.wordv = d_b;
bigint_square(&d, a);
bigint_copy(dest, &d);
return;
}
uint16_t n;
n=(a->length_B+1)/2;
n=(a->length_W+1)/2;
bigint_t xh, xl, tmp; /* x-high, x-low, temp */
bigint_word_t buffer[2*n+1];
xl.wordv = a->wordv;
xl.length_B = n;
xl.length_W = n;
xl.info = 0;
xh.wordv = &(a->wordv[n]);
xh.length_B = a->length_B-n;
xh.length_W = a->length_W-n;
xh.info = 0;
bigint_adjust(&xl);
bigint_adjust(&xh);
@ -670,10 +670,10 @@ void bigint_square(bigint_t* dest, const bigint_t* a){
/******************************************************************************/
void bigint_sub_u_bitscale(bigint_t* a, const bigint_t* b, uint16_t bitscale){
bigint_t tmp, x;
bigint_word_t tmp_b[b->length_B + 1];
bigint_word_t tmp_b[b->length_W + 1];
const uint16_t word_shift = bitscale / BIGINT_WORD_SIZE;
if(a->length_B < b->length_B + word_shift){
if(a->length_W < b->length_W + word_shift){
#if DEBUG
cli_putstr("\r\nDBG: *bang*\r\n");
#endif
@ -686,7 +686,7 @@ void bigint_sub_u_bitscale(bigint_t* a, const bigint_t* b, uint16_t bitscale){
x.info = a->info;
x.wordv = &(a->wordv[word_shift]);
x.length_B = a->length_B - word_shift;
x.length_W = a->length_W - word_shift;
bigint_sub_u(&x, &x, &tmp);
bigint_adjust(a);
@ -701,40 +701,40 @@ void bigint_reduce(bigint_t* a, const bigint_t* r){
#if DEBUG
cli_putstr("\r\nDBG: (a) = "); bigint_print_hex(a);
#endif
if(r->length_B==0 || a->length_B==0){
if(r->length_W==0 || a->length_W==0){
return;
}
if((r->length_B*sizeof(bigint_word_t)<=4) && (a->length_B*sizeof(bigint_word_t)<=4)){
if((r->length_W*sizeof(bigint_word_t)<=4) && (a->length_W*sizeof(bigint_word_t)<=4)){
uint32_t p=0, q=0;
memcpy(&p, a->wordv, a->length_B*sizeof(bigint_word_t));
memcpy(&q, r->wordv, r->length_B*sizeof(bigint_word_t));
memcpy(&p, a->wordv, a->length_W*sizeof(bigint_word_t));
memcpy(&q, r->wordv, r->length_W*sizeof(bigint_word_t));
p %= q;
memcpy(a->wordv, &p, a->length_B*sizeof(bigint_word_t));
memcpy(a->wordv, &p, a->length_W*sizeof(bigint_word_t));
bigint_adjust(a);
// cli_putstr("\r\nDBG: (0) = "); bigint_print_hex(a);
return;
}
uint16_t shift;
while(a->length_B > r->length_B){
shift = (a->length_B - r->length_B) * 8 * sizeof(bigint_word_t) + GET_FBS(a) - rfbs - 1;
while(a->length_W > r->length_W){
shift = (a->length_W - r->length_W) * 8 * sizeof(bigint_word_t) + GET_FBS(a) - rfbs - 1;
/*
if((a->wordv[a->length_B-1] & ((1LL<<GET_FBS(a)) - 1)) > r->wordv[r->length_B-1]){
if((a->wordv[a->length_W-1] & ((1LL<<GET_FBS(a)) - 1)) > r->wordv[r->length_W-1]){
// cli_putc('~');
cli_putstr("\r\n ~ [a] = ");
cli_hexdump_rev(&a->wordv[a->length_B-1], 4);
cli_hexdump_rev(&a->wordv[a->length_W-1], 4);
cli_putstr(" [r] = ");
cli_hexdump_rev(&r->wordv[r->length_B-1], 4);
cli_hexdump_rev(&r->wordv[r->length_W-1], 4);
shift += 1;
}
*/
// cli_putstr("\r\nDBG: (p) shift = "); cli_hexdump_rev(&shift, 2);
// cli_putstr(" a_len = "); cli_hexdump_rev(&a->length_B, 2);
// cli_putstr(" r_len = "); cli_hexdump_rev(&r->length_B, 2);
// cli_putstr(" a_len = "); cli_hexdump_rev(&a->length_W, 2);
// cli_putstr(" r_len = "); cli_hexdump_rev(&r->length_W, 2);
// uart_flush(0);
bigint_sub_u_bitscale(a, r, shift);
// cli_putstr("\r\nDBG: (1) = "); bigint_print_hex(a);
}
while((GET_FBS(a) > rfbs) && (a->length_B == r->length_B)){
while((GET_FBS(a) > rfbs) && (a->length_W == r->length_W)){
shift = GET_FBS(a)-rfbs-1;
// cli_putstr("\r\nDBG: (q) shift = "); cli_hexdump_rev(&shift, 2);
bigint_sub_u_bitscale(a, r, shift);
@ -754,12 +754,12 @@ void bigint_reduce(bigint_t* a, const bigint_t* r){
/* calculate dest = a**exp % r */
/* using square&multiply */
void bigint_expmod_u(bigint_t* dest, const bigint_t* a, const bigint_t* exp, const bigint_t* r){
if(a->length_B==0 || r->length_B==0){
if(a->length_W==0 || r->length_W==0){
return;
}
bigint_t res, base;
bigint_word_t t, base_b[MAX(a->length_B,r->length_B)], res_b[r->length_B*2];
bigint_word_t t, base_b[MAX(a->length_W,r->length_W)], res_b[r->length_W*2];
uint16_t i;
uint8_t j;
// uint16_t *xaddr = &i;
@ -772,16 +772,16 @@ void bigint_expmod_u(bigint_t* dest, const bigint_t* a, const bigint_t* exp, con
// cli_putstr("\r\npost-copy");
bigint_reduce(&base, r);
res.wordv[0]=1;
res.length_B=1;
res.length_W=1;
res.info = 0;
bigint_adjust(&res);
if(exp->length_B == 0){
if(exp->length_W == 0){
bigint_copy(dest, &res);
return;
}
uint8_t flag = 0;
t=exp->wordv[exp->length_B - 1];
for(i=exp->length_B; i > 0; --i){
t=exp->wordv[exp->length_W - 1];
for(i=exp->length_W; i > 0; --i){
t = exp->wordv[i - 1];
for(j=BIGINT_WORD_SIZE; j > 0; --j){
if(!flag){
@ -817,14 +817,14 @@ void bigint_expmod_u(bigint_t* dest, const bigint_t* a, const bigint_t* exp, con
void bigint_gcdext(bigint_t* gcd, bigint_t* a, bigint_t* b, const bigint_t* x, const bigint_t* y){
bigint_t g, x_, y_, u, v, a_, b_, c_, d_;
uint16_t i=0;
if(x->length_B==0 || y->length_B==0){
if(x->length_W==0 || y->length_W==0){
return;
}
if(x->length_B==1 && x->wordv[0]==1){
gcd->length_B = 1;
if(x->length_W==1 && x->wordv[0]==1){
gcd->length_W = 1;
gcd->wordv[0] = 1;
if(a){
a->length_B = 1;
a->length_W = 1;
a->wordv[0] = 1;
SET_POS(a);
bigint_adjust(a);
@ -834,11 +834,11 @@ void bigint_gcdext(bigint_t* gcd, bigint_t* a, bigint_t* b, const bigint_t* x, c
}
return;
}
if(y->length_B==1 && y->wordv[0]==1){
gcd->length_B = 1;
if(y->length_W==1 && y->wordv[0]==1){
gcd->length_W = 1;
gcd->wordv[0] = 1;
if(b){
b->length_B = 1;
b->length_W = 1;
b->wordv[0] = 1;
SET_POS(b);
bigint_adjust(b);
@ -852,23 +852,23 @@ void bigint_gcdext(bigint_t* gcd, bigint_t* a, bigint_t* b, const bigint_t* x, c
while(x->wordv[i]==0 && y->wordv[i]==0){
++i;
}
bigint_word_t g_b[i+2], x_b[x->length_B-i], y_b[y->length_B-i];
bigint_word_t u_b[x->length_B-i], v_b[y->length_B-i];
bigint_word_t a_b[y->length_B+2], c_b[y->length_B+2];
bigint_word_t b_b[x->length_B+2], d_b[x->length_B+2];
bigint_word_t g_b[i+2], x_b[x->length_W-i], y_b[y->length_W-i];
bigint_word_t u_b[x->length_W-i], v_b[y->length_W-i];
bigint_word_t a_b[y->length_W+2], c_b[y->length_W+2];
bigint_word_t b_b[x->length_W+2], d_b[x->length_W+2];
g.wordv = g_b;
x_.wordv = x_b;
y_.wordv = y_b;
memset(g_b, 0, i*sizeof(bigint_word_t));
g_b[i]=1;
g.length_B = i+1;
g.length_W = i+1;
g.info=0;
x_.info = y_.info = 0;
x_.length_B = x->length_B-i;
y_.length_B = y->length_B-i;
memcpy(x_.wordv, x->wordv+i, x_.length_B*sizeof(bigint_word_t));
memcpy(y_.wordv, y->wordv+i, y_.length_B*sizeof(bigint_word_t));
x_.length_W = x->length_W-i;
y_.length_W = y->length_W-i;
memcpy(x_.wordv, x->wordv+i, x_.length_W*sizeof(bigint_word_t));
memcpy(y_.wordv, y->wordv+i, y_.length_W*sizeof(bigint_word_t));
for(i=0; (x_.wordv[0]&(1<<i))==0 && (y_.wordv[0]&(1<<i))==0; ++i){
}
@ -891,10 +891,10 @@ void bigint_gcdext(bigint_t* gcd, bigint_t* a, bigint_t* b, const bigint_t* x, c
bigint_copy(&u, &x_);
bigint_copy(&v, &y_);
a_.wordv[0] = 1;
a_.length_B = 1;
a_.length_W = 1;
a_.info = 0;
d_.wordv[0] = 1;
d_.length_B = 1;
d_.length_W = 1;
d_.info = 0;
bigint_set_zero(&b_);
bigint_set_zero(&c_);
@ -930,7 +930,7 @@ void bigint_gcdext(bigint_t* gcd, bigint_t* a, bigint_t* b, const bigint_t* x, c
bigint_sub_s(&c_, &c_, &a_);
bigint_sub_s(&d_, &d_, &b_);
}
}while(u.length_B);
}while(u.length_W);
if(gcd){
bigint_mul_s(gcd, &v, &g);
}
@ -956,7 +956,7 @@ void bigint_inverse(bigint_t* dest, const bigint_t* a, const bigint_t* m){
void bigint_changeendianess(bigint_t* a){
uint8_t t, *p, *q;
p = (uint8_t*)(a->wordv);
q = p + a->length_B * sizeof(bigint_word_t) - 1;
q = p + a->length_W * sizeof(bigint_word_t) - 1;
while(p<q){
t = *p;
*p = *q;

2
bigint/bigint.h
View File

@ -38,7 +38,7 @@ typedef int64_t bigint_wordplus_signed_t;
#define BIGINT_FBS_MASK (BIGINT_WORD_SIZE-1) /* the last five bits indicate which is the first bit set */
#define BIGINT_NEG_MASK 0x80 /* this bit indicates a negative value */
typedef struct{
uint16_t length_B;
uint16_t length_W;
uint8_t info;
bigint_word_t *wordv; /* word vector, pointing to the LSB */
}bigint_t;

18
bigint/bigint_io.c
View File

@ -24,7 +24,7 @@
#include <string.h>
void bigint_print_hex(const bigint_t* a){
if(a->length_B==0){
if(a->length_W==0){
cli_putc('0');
return;
}
@ -32,18 +32,18 @@ void bigint_print_hex(const bigint_t* a){
cli_putc('-');
}
// cli_putc((a->info&BIGINT_NEG_MASK)?'-':'+'); /* print sign */
/* if(a->wordv[a->length_B-1]<0x10){
cli_putc(hexdigit_tab_uc[a->wordv[a->length_B-1]]);
cli_hexdump_rev(a->wordv, a->length_B-1);
/* if(a->wordv[a->length_W-1]<0x10){
cli_putc(hexdigit_tab_uc[a->wordv[a->length_W-1]]);
cli_hexdump_rev(a->wordv, a->length_W-1);
} else {
*/
// cli_hexdump_rev(a->wordv, a->length_B*sizeof(bigint_word_t));
// cli_hexdump_rev(a->wordv, a->length_W*sizeof(bigint_word_t));
// }
uint32_t idx;
uint8_t print_zero=0;
uint8_t *p,x,y;
p = (uint8_t*)&(a->wordv[a->length_B-1])+sizeof(bigint_word_t)-1;
for(idx = a->length_B * sizeof(bigint_word_t); idx > 0; --idx){
p = (uint8_t*)&(a->wordv[a->length_W-1])+sizeof(bigint_word_t)-1;
for(idx = a->length_W * sizeof(bigint_word_t); idx > 0; --idx){
x = *p >> 4;
y = *p & 0xf;
if(x!=0 || print_zero!=0){
@ -98,7 +98,7 @@ uint8_t bigint_read_hex_echo(bigint_t* a){
uint16_t allocated=0;
uint8_t shift4=0;
uint16_t t, idx = 0;
a->length_B = 0;
a->length_W = 0;
a->wordv = NULL;
a->info = 0;
for(;;){
@ -140,7 +140,7 @@ uint8_t bigint_read_hex_echo(bigint_t* a){
/* we have to reverse the byte array */
uint8_t tmp;
uint8_t *p, *q;
a->length_B = (idx + sizeof(bigint_word_t)-1)/sizeof(bigint_word_t);
a->length_W = (idx + sizeof(bigint_word_t)-1)/sizeof(bigint_word_t);
p = (uint8_t*)(a->wordv);
q = (uint8_t*)a->wordv + idx - 1;
while(q>p){