bigint looks good but needs more testing (gcdext fixed)
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8fa939d627
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@ -574,12 +574,6 @@ void bigint_square(bigint_t* dest, const bigint_t* a){
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}
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/******************************************************************************/
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#define cli_putstr(a)
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#define bigint_print_hex(a)
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#define cli_hexdump_rev(a,b)
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#define uart_flush(a)
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void bigint_sub_u_bitscale(bigint_t* a, const bigint_t* b, uint16_t bitscale){
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bigint_t tmp;
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bigint_word_t tmp_b[b->length_B+4];
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@ -595,7 +589,7 @@ void bigint_sub_u_bitscale(bigint_t* a, const bigint_t* b, uint16_t bitscale){
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tmp.wordv = tmp_b;
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bigint_copy(&tmp, b);
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bigint_shiftleft(&tmp, bitscale&(BIGINT_WORD_SIZE-1));
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cli_putstr("\r\nDBG(sub_ub.0) tmp_shift = "); bigint_print_hex(&tmp);
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// cli_putstr("\r\nDBG(sub_ub.0) tmp_shift = "); bigint_print_hex(&tmp);
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for(j=0,i=word_shift; i<tmp.length_B+word_shift; ++i, ++j){
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t = a->wordv[i];
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t -= tmp.wordv[j];
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@ -628,7 +622,7 @@ void bigint_reduce(bigint_t* a, const bigint_t* r){
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// bigint_adjust(r);
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uint8_t rfbs = GET_FBS(r);
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cli_putstr("\r\nDBG: (a) = "); bigint_print_hex(a);
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// cli_putstr("\r\nDBG: (a) = "); bigint_print_hex(a);
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if(r->length_B==0 || a->length_B==0){
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return;
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}
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@ -639,30 +633,30 @@ void bigint_reduce(bigint_t* a, const bigint_t* r){
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p %= q;
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memcpy(a->wordv, &p, a->length_B*sizeof(bigint_word_t));
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bigint_adjust(a);
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cli_putstr("\r\nDBG: (0) = "); bigint_print_hex(a);
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// cli_putstr("\r\nDBG: (0) = "); bigint_print_hex(a);
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return;
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}
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uint16_t shift;
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while(a->length_B > r->length_B){
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shift = (a->length_B-r->length_B)*8*sizeof(bigint_word_t)+GET_FBS(a)-rfbs-1;
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cli_putstr("\r\nDBG: (p) shift = "); cli_hexdump_rev(&shift, 2);
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uart_flush(0);
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// cli_putstr("\r\nDBG: (p) shift = "); cli_hexdump_rev(&shift, 2);
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// uart_flush(0);
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bigint_sub_u_bitscale(a, r, shift);
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cli_putstr("\r\nDBG: (1) = "); bigint_print_hex(a);
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// cli_putstr("\r\nDBG: (1) = "); bigint_print_hex(a);
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}
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while((GET_FBS(a) > rfbs+1) && (a->length_B == r->length_B)){
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shift = GET_FBS(a)-rfbs-1;
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cli_putstr("\r\nDBG: (q) shift = "); cli_hexdump_rev(&shift, 2);
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// cli_putstr("\r\nDBG: (q) shift = "); cli_hexdump_rev(&shift, 2);
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bigint_sub_u_bitscale(a, r, GET_FBS(a)-rfbs-1);
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cli_putstr("\r\nDBG: (2) = "); bigint_print_hex(a);
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// cli_putstr("\r\nDBG: (2) = "); bigint_print_hex(a);
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}
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while(bigint_cmp_u(a,r)>=0){
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bigint_sub_u(a,a,r);
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cli_putstr("\r\nDBG: (3) = "); bigint_print_hex(a);
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// cli_putstr("\r\nDBG: (3) = "); bigint_print_hex(a);
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}
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bigint_adjust(a);
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cli_putstr("\r\nDBG: (a) = "); bigint_print_hex(a);
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cli_putstr("\r\n");
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// cli_putstr("\r\nDBG: (a) = "); bigint_print_hex(a);
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// cli_putstr("\r\n");
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}
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/******************************************************************************/
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@ -713,13 +707,48 @@ void bigint_expmod_u(bigint_t* dest, const bigint_t* a, const bigint_t* exp, con
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}
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/******************************************************************************/
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#define cli_putstr(a)
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#define bigint_print_hex(a)
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#define cli_hexdump_rev(a,b)
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#define uart_flush(a)
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/* gcd <-- gcd(x,y) a*x+b*y=gcd */
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void bigint_gcdext(bigint_t* gcd, bigint_t* a, bigint_t* b, const bigint_t* x, const bigint_t* y){
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bigint_t g, x_, y_, u, v, a_, b_, c_, d_;
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volatile uint16_t i=0;
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uint16_t i=0;
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if(x->length_B==0 || y->length_B==0){
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return;
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}
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if(x->length_B==1 && x->wordv[0]==1){
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gcd->length_B = 1;
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gcd->wordv[0] = 1;
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if(a){
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a->length_B = 1;
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a->wordv[0] = 1;
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SET_POS(a);
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bigint_adjust(a);
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}
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if(b){
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bigint_set_zero(b);
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}
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return;
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}
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if(y->length_B==1 && y->wordv[0]==1){
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gcd->length_B = 1;
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gcd->wordv[0] = 1;
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if(b){
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b->length_B = 1;
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b->wordv[0] = 1;
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SET_POS(b);
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bigint_adjust(b);
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}
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if(a){
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bigint_set_zero(a);
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}
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return;
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}
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while(x->wordv[i]==0 && y->wordv[i]==0){
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++i;
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}
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@ -731,7 +760,7 @@ void bigint_gcdext(bigint_t* gcd, bigint_t* a, bigint_t* b, const bigint_t* x, c
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g.wordv = g_b;
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x_.wordv = x_b;
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y_.wordv = y_b;
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memset(g_b, 0, i);
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memset(g_b, 0, i*sizeof(bigint_word_t));
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g_b[i]=1;
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g.length_B = i+1;
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g.info=0;
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@ -751,6 +780,7 @@ void bigint_gcdext(bigint_t* gcd, bigint_t* a, bigint_t* b, const bigint_t* x, c
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bigint_shiftright(&x_, i);
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bigint_shiftright(&y_, i);
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}
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u.wordv = u_b;
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v.wordv = v_b;
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a_.wordv = a_b;
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@ -769,7 +799,9 @@ void bigint_gcdext(bigint_t* gcd, bigint_t* a, bigint_t* b, const bigint_t* x, c
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bigint_set_zero(&b_);
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bigint_set_zero(&c_);
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do{
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cli_putstr("\r\nDBG (gcdext) 0");
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while((u.wordv[0]&1)==0){
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cli_putstr("\r\nDBG (gcdext) 0.1");
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bigint_shiftright(&u, 1);
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if((a_.wordv[0]&1) || (b_.wordv[0]&1)){
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bigint_add_s(&a_, &a_, &y_);
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@ -779,6 +811,7 @@ void bigint_gcdext(bigint_t* gcd, bigint_t* a, bigint_t* b, const bigint_t* x, c
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bigint_shiftright(&b_, 1);
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}
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while((v.wordv[0]&1)==0){
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cli_putstr("\r\nDBG (gcdext) 0.2");
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bigint_shiftright(&v, 1);
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if((c_.wordv[0]&1) || (d_.wordv[0]&1)){
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bigint_add_s(&c_, &c_, &y_);
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@ -482,16 +482,14 @@ def gcdext_test(a,b)
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$sp.print(b.to_s(16)+" ")
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line=''
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begin
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line_tmp = $sp.gets()
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line_tmp = '' if line_tmp==nil
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line = '' if line.end_with?('\n')
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line += line_tmp
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line = $sp.gets()
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line = '' if line==nil
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puts("DBG got: "+line) if $debug
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if /^Error:.*/.match(line)
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puts line
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return false
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end
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end while not m=/gcdext\([\s]*([+-]?[0-9a-fA-F]*)[\s]*,[\s]*([+-]?[0-9a-fA-F]*)[\s]*\)[\s]*=> a = ([+-]?[0-9a-fA-F]+); b = ([+-]?[0-9a-fA-F]+); gcd = ([+-]?[0-9a-fA-F]+)/.match(line)
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end while not m=/gcdext\([\s]*([+-]?[0-9a-fA-F]*)[\s]*,[\s]*([+-]?[0-9a-fA-F]*)[\s]*\)[\s]*=>[\s]*a[\s]*=[\s]*([+-]?[0-9a-fA-F]+);[\s]*b[\s]*=[\s]*([+-]?[0-9a-fA-F]+);[\s]*gcd[\s]*=[\s]*([+-]?[0-9a-fA-F]+)/.match(line)
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a_ = m[1].to_i(16)
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b_ = m[2].to_i(16)
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c_ = m[3].to_i(16)
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@ -669,7 +667,7 @@ def run_test_gcdext(skip=0)
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begin
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$size = length_a_B
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(0..16).each do |i|
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a = rand(256**length_a_B)
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a = rand(256**length_a_B)+1
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b = rand(256**length_a_B)+1
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v = gcdext_test(a, b)
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$logfile.flush()
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@ -677,7 +675,7 @@ def run_test_gcdext(skip=0)
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end
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(0..16).each do |i|
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b_size = rand(length_b_B+1)
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a = rand(256**length_a_B)
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a = rand(256**length_a_B)+1
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b = rand(256**b_size)+1
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v = gcdext_test(a, b)
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$logfile.flush()
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