Back to index

lightning-sunbird  0.9+nobinonly
Functions
ec2_193.c File Reference
#include "ec2.h"
#include "mp_gf2m.h"
#include "mp_gf2m-priv.h"
#include "mpi.h"
#include "mpi-priv.h"
#include <stdlib.h>

Go to the source code of this file.

Functions

mp_err ec_GF2m_193_mod (const mp_int *a, mp_int *r, const GFMethod *meth)
mp_err ec_GF2m_193_sqr (const mp_int *a, mp_int *r, const GFMethod *meth)
mp_err ec_GF2m_193_mul (const mp_int *a, const mp_int *b, mp_int *r, const GFMethod *meth)
mp_err ec_group_set_gf2m193 (ECGroup *group, ECCurveName name)

Function Documentation

mp_err ec_GF2m_193_mod ( const mp_int a,
mp_int r,
const GFMethod *  meth 
)

Definition at line 51 of file ec2_193.c.

{
       mp_err res = MP_OKAY;
       mp_digit *u, z;

       if (a != r) {
              MP_CHECKOK(mp_copy(a, r));
       }
#ifdef ECL_SIXTY_FOUR_BIT
       if (MP_USED(r) < 7) {
              MP_CHECKOK(s_mp_pad(r, 7));
       }
       u = MP_DIGITS(r);
       MP_USED(r) = 7;

       /* u[6] only has 2 significant bits */
       z = u[6];
       u[3] ^= (z << 14) ^ (z >> 1);
       u[2] ^= (z << 63);
       z = u[5];
       u[3] ^= (z >> 50);
       u[2] ^= (z << 14) ^ (z >> 1);
       u[1] ^= (z << 63);
       z = u[4];
       u[2] ^= (z >> 50);
       u[1] ^= (z << 14) ^ (z >> 1);
       u[0] ^= (z << 63);
       z = u[3] >> 1;                            /* z only has 63 significant bits */
       u[1] ^= (z >> 49);
       u[0] ^= (z << 15) ^ z;
       /* clear bits above 193 */
       u[6] = u[5] = u[4] = 0;
       u[3] ^= z << 1;
#else
       if (MP_USED(r) < 13) {
              MP_CHECKOK(s_mp_pad(r, 13));
       }
       u = MP_DIGITS(r);
       MP_USED(r) = 13;

       /* u[12] only has 2 significant bits */
       z = u[12];
       u[6] ^= (z << 14) ^ (z >> 1);
       u[5] ^= (z << 31);
       z = u[11];
       u[6] ^= (z >> 18);
       u[5] ^= (z << 14) ^ (z >> 1);
       u[4] ^= (z << 31);
       z = u[10];
       u[5] ^= (z >> 18);
       u[4] ^= (z << 14) ^ (z >> 1);
       u[3] ^= (z << 31);
       z = u[9];
       u[4] ^= (z >> 18);
       u[3] ^= (z << 14) ^ (z >> 1);
       u[2] ^= (z << 31);
       z = u[8];
       u[3] ^= (z >> 18);
       u[2] ^= (z << 14) ^ (z >> 1);
       u[1] ^= (z << 31);
       z = u[7];
       u[2] ^= (z >> 18);
       u[1] ^= (z << 14) ^ (z >> 1);
       u[0] ^= (z << 31);
       z = u[6] >> 1;                            /* z only has 31 significant bits */
       u[1] ^= (z >> 17);
       u[0] ^= (z << 15) ^ z;
       /* clear bits above 193 */
       u[12] = u[11] = u[10] = u[9] = u[8] = u[7] = 0;
       u[6] ^= z << 1;
#endif
       s_mp_clamp(r);

  CLEANUP:
       return res;
}

Here is the call graph for this function:

mp_err ec_GF2m_193_mul ( const mp_int a,
const mp_int b,
mp_int r,
const GFMethod *  meth 
)

Definition at line 181 of file ec2_193.c.

{
       mp_err res = MP_OKAY;
       mp_digit a3 = 0, a2 = 0, a1 = 0, a0, b3 = 0, b2 = 0, b1 = 0, b0;

#ifdef ECL_THIRTY_TWO_BIT
       mp_digit a6 = 0, a5 = 0, a4 = 0, b6 = 0, b5 = 0, b4 = 0;
       mp_digit rm[8];
#endif

       if (a == b) {
              return ec_GF2m_193_sqr(a, r, meth);
       } else {
              switch (MP_USED(a)) {
#ifdef ECL_THIRTY_TWO_BIT
              case 7:
                     a6 = MP_DIGIT(a, 6);
              case 6:
                     a5 = MP_DIGIT(a, 5);
              case 5:
                     a4 = MP_DIGIT(a, 4);
#endif
              case 4:
                     a3 = MP_DIGIT(a, 3);
              case 3:
                     a2 = MP_DIGIT(a, 2);
              case 2:
                     a1 = MP_DIGIT(a, 1);
              default:
                     a0 = MP_DIGIT(a, 0);
              }
              switch (MP_USED(b)) {
#ifdef ECL_THIRTY_TWO_BIT
              case 7:
                     b6 = MP_DIGIT(b, 6);
              case 6:
                     b5 = MP_DIGIT(b, 5);
              case 5:
                     b4 = MP_DIGIT(b, 4);
#endif
              case 4:
                     b3 = MP_DIGIT(b, 3);
              case 3:
                     b2 = MP_DIGIT(b, 2);
              case 2:
                     b1 = MP_DIGIT(b, 1);
              default:
                     b0 = MP_DIGIT(b, 0);
              }
#ifdef ECL_SIXTY_FOUR_BIT
              MP_CHECKOK(s_mp_pad(r, 8));
              s_bmul_4x4(MP_DIGITS(r), a3, a2, a1, a0, b3, b2, b1, b0);
              MP_USED(r) = 8;
              s_mp_clamp(r);
#else
              MP_CHECKOK(s_mp_pad(r, 14));
              s_bmul_3x3(MP_DIGITS(r) + 8, a6, a5, a4, b6, b5, b4);
              s_bmul_4x4(MP_DIGITS(r), a3, a2, a1, a0, b3, b2, b1, b0);
              s_bmul_4x4(rm, a3, a6 ^ a2, a5 ^ a1, a4 ^ a0, b3, b6 ^ b2, b5 ^ b1,
                               b4 ^ b0);
              rm[7] ^= MP_DIGIT(r, 7);
              rm[6] ^= MP_DIGIT(r, 6);
              rm[5] ^= MP_DIGIT(r, 5) ^ MP_DIGIT(r, 13);
              rm[4] ^= MP_DIGIT(r, 4) ^ MP_DIGIT(r, 12);
              rm[3] ^= MP_DIGIT(r, 3) ^ MP_DIGIT(r, 11);
              rm[2] ^= MP_DIGIT(r, 2) ^ MP_DIGIT(r, 10);
              rm[1] ^= MP_DIGIT(r, 1) ^ MP_DIGIT(r, 9);
              rm[0] ^= MP_DIGIT(r, 0) ^ MP_DIGIT(r, 8);
              MP_DIGIT(r, 11) ^= rm[7];
              MP_DIGIT(r, 10) ^= rm[6];
              MP_DIGIT(r, 9) ^= rm[5];
              MP_DIGIT(r, 8) ^= rm[4];
              MP_DIGIT(r, 7) ^= rm[3];
              MP_DIGIT(r, 6) ^= rm[2];
              MP_DIGIT(r, 5) ^= rm[1];
              MP_DIGIT(r, 4) ^= rm[0];
              MP_USED(r) = 14;
              s_mp_clamp(r);
#endif
              return ec_GF2m_193_mod(r, r, meth);
       }

  CLEANUP:
       return res;
}

Here is the call graph for this function:

mp_err ec_GF2m_193_sqr ( const mp_int a,
mp_int r,
const GFMethod *  meth 
)

Definition at line 131 of file ec2_193.c.

{
       mp_err res = MP_OKAY;
       mp_digit *u, *v;

       v = MP_DIGITS(a);

#ifdef ECL_SIXTY_FOUR_BIT
       if (MP_USED(a) < 4) {
              return mp_bsqrmod(a, meth->irr_arr, r);
       }
       if (MP_USED(r) < 7) {
              MP_CHECKOK(s_mp_pad(r, 7));
       }
       MP_USED(r) = 7;
#else
       if (MP_USED(a) < 7) {
              return mp_bsqrmod(a, meth->irr_arr, r);
       }
       if (MP_USED(r) < 13) {
              MP_CHECKOK(s_mp_pad(r, 13));
       }
       MP_USED(r) = 13;
#endif
       u = MP_DIGITS(r);

#ifdef ECL_THIRTY_TWO_BIT
       u[12] = gf2m_SQR0(v[6]);
       u[11] = gf2m_SQR1(v[5]);
       u[10] = gf2m_SQR0(v[5]);
       u[9] = gf2m_SQR1(v[4]);
       u[8] = gf2m_SQR0(v[4]);
       u[7] = gf2m_SQR1(v[3]);
#endif
       u[6] = gf2m_SQR0(v[3]);
       u[5] = gf2m_SQR1(v[2]);
       u[4] = gf2m_SQR0(v[2]);
       u[3] = gf2m_SQR1(v[1]);
       u[2] = gf2m_SQR0(v[1]);
       u[1] = gf2m_SQR1(v[0]);
       u[0] = gf2m_SQR0(v[0]);
       return ec_GF2m_193_mod(r, r, meth);

  CLEANUP:
       return res;
}

Here is the call graph for this function:

mp_err ec_group_set_gf2m193 ( ECGroup *  group,
ECCurveName  name 
)

Definition at line 270 of file ec2_193.c.

{
       group->meth->field_mod = &ec_GF2m_193_mod;
       group->meth->field_mul = &ec_GF2m_193_mul;
       group->meth->field_sqr = &ec_GF2m_193_sqr;
       return MP_OKAY;
}

Here is the call graph for this function: