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lightning-sunbird  0.9+nobinonly
Functions
ec2_163.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_163_mod (const mp_int *a, mp_int *r, const GFMethod *meth)
mp_err ec_GF2m_163_sqr (const mp_int *a, mp_int *r, const GFMethod *meth)
mp_err ec_GF2m_163_mul (const mp_int *a, const mp_int *b, mp_int *r, const GFMethod *meth)
mp_err ec_group_set_gf2m163 (ECGroup *group, ECCurveName name)

Function Documentation

mp_err ec_GF2m_163_mod ( const mp_int a,
mp_int r,
const GFMethod *  meth 
)

Definition at line 51 of file ec2_163.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) < 6) {
              MP_CHECKOK(s_mp_pad(r, 6));
       }
       u = MP_DIGITS(r);
       MP_USED(r) = 6;

       /* u[5] only has 6 significant bits */
       z = u[5];
       u[2] ^= (z << 36) ^ (z << 35) ^ (z << 32) ^ (z << 29);
       z = u[4];
       u[2] ^= (z >> 28) ^ (z >> 29) ^ (z >> 32) ^ (z >> 35);
       u[1] ^= (z << 36) ^ (z << 35) ^ (z << 32) ^ (z << 29);
       z = u[3];
       u[1] ^= (z >> 28) ^ (z >> 29) ^ (z >> 32) ^ (z >> 35);
       u[0] ^= (z << 36) ^ (z << 35) ^ (z << 32) ^ (z << 29);
       z = u[2] >> 35;                           /* z only has 29 significant bits */
       u[0] ^= (z << 7) ^ (z << 6) ^ (z << 3) ^ z;
       /* clear bits above 163 */
       u[5] = u[4] = u[3] = 0;
       u[2] ^= z << 35;
#else
       if (MP_USED(r) < 11) {
              MP_CHECKOK(s_mp_pad(r, 11));
       }
       u = MP_DIGITS(r);
       MP_USED(r) = 11;

       /* u[11] only has 6 significant bits */
       z = u[10];
       u[5] ^= (z << 4) ^ (z << 3) ^ z ^ (z >> 3);
       u[4] ^= (z << 29);
       z = u[9];
       u[5] ^= (z >> 28) ^ (z >> 29);
       u[4] ^= (z << 4) ^ (z << 3) ^ z ^ (z >> 3);
       u[3] ^= (z << 29);
       z = u[8];
       u[4] ^= (z >> 28) ^ (z >> 29);
       u[3] ^= (z << 4) ^ (z << 3) ^ z ^ (z >> 3);
       u[2] ^= (z << 29);
       z = u[7];
       u[3] ^= (z >> 28) ^ (z >> 29);
       u[2] ^= (z << 4) ^ (z << 3) ^ z ^ (z >> 3);
       u[1] ^= (z << 29);
       z = u[6];
       u[2] ^= (z >> 28) ^ (z >> 29);
       u[1] ^= (z << 4) ^ (z << 3) ^ z ^ (z >> 3);
       u[0] ^= (z << 29);
       z = u[5] >> 3;                            /* z only has 29 significant bits */
       u[1] ^= (z >> 25) ^ (z >> 26);
       u[0] ^= (z << 7) ^ (z << 6) ^ (z << 3) ^ z;
       /* clear bits above 163 */
       u[11] = u[10] = u[9] = u[8] = u[7] = u[6] = 0;
       u[5] ^= z << 3;
#endif
       s_mp_clamp(r);

  CLEANUP:
       return res;
}

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mp_err ec_GF2m_163_mul ( const mp_int a,
const mp_int b,
mp_int r,
const GFMethod *  meth 
)

Definition at line 172 of file ec2_163.c.

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

#ifdef ECL_THIRTY_TWO_BIT
       mp_digit a5 = 0, a4 = 0, a3 = 0, b5 = 0, b4 = 0, b3 = 0;
       mp_digit rm[6];
#endif

       if (a == b) {
              return ec_GF2m_163_sqr(a, r, meth);
       } else {
              switch (MP_USED(a)) {
#ifdef ECL_THIRTY_TWO_BIT
              case 6:
                     a5 = MP_DIGIT(a, 5);
              case 5:
                     a4 = MP_DIGIT(a, 4);
              case 4:
                     a3 = MP_DIGIT(a, 3);
#endif
              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 6:
                     b5 = MP_DIGIT(b, 5);
              case 5:
                     b4 = MP_DIGIT(b, 4);
              case 4:
                     b3 = MP_DIGIT(b, 3);
#endif
              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, 6));
              s_bmul_3x3(MP_DIGITS(r), a2, a1, a0, b2, b1, b0);
              MP_USED(r) = 6;
              s_mp_clamp(r);
#else
              MP_CHECKOK(s_mp_pad(r, 12));
              s_bmul_3x3(MP_DIGITS(r) + 6, a5, a4, a3, b5, b4, b3);
              s_bmul_3x3(MP_DIGITS(r), a2, a1, a0, b2, b1, b0);
              s_bmul_3x3(rm, a5 ^ a2, a4 ^ a1, a3 ^ a0, b5 ^ b2, b4 ^ b1,
                               b3 ^ b0);
              rm[5] ^= MP_DIGIT(r, 5) ^ MP_DIGIT(r, 11);
              rm[4] ^= MP_DIGIT(r, 4) ^ MP_DIGIT(r, 10);
              rm[3] ^= MP_DIGIT(r, 3) ^ MP_DIGIT(r, 9);
              rm[2] ^= MP_DIGIT(r, 2) ^ MP_DIGIT(r, 8);
              rm[1] ^= MP_DIGIT(r, 1) ^ MP_DIGIT(r, 7);
              rm[0] ^= MP_DIGIT(r, 0) ^ MP_DIGIT(r, 6);
              MP_DIGIT(r, 8) ^= rm[5];
              MP_DIGIT(r, 7) ^= rm[4];
              MP_DIGIT(r, 6) ^= rm[3];
              MP_DIGIT(r, 5) ^= rm[2];
              MP_DIGIT(r, 4) ^= rm[1];
              MP_DIGIT(r, 3) ^= rm[0];
              MP_USED(r) = 12;
              s_mp_clamp(r);
#endif
              return ec_GF2m_163_mod(r, r, meth);
       }

  CLEANUP:
       return res;
}

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mp_err ec_GF2m_163_sqr ( const mp_int a,
mp_int r,
const GFMethod *  meth 
)

Definition at line 123 of file ec2_163.c.

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

       v = MP_DIGITS(a);

#ifdef ECL_SIXTY_FOUR_BIT
       if (MP_USED(a) < 3) {
              return mp_bsqrmod(a, meth->irr_arr, r);
       }
       if (MP_USED(r) < 6) {
              MP_CHECKOK(s_mp_pad(r, 6));
       }
       MP_USED(r) = 6;
#else
       if (MP_USED(a) < 6) {
              return mp_bsqrmod(a, meth->irr_arr, r);
       }
       if (MP_USED(r) < 12) {
              MP_CHECKOK(s_mp_pad(r, 12));
       }
       MP_USED(r) = 12;
#endif
       u = MP_DIGITS(r);

#ifdef ECL_THIRTY_TWO_BIT
       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]);
       u[6] = gf2m_SQR0(v[3]);
#endif
       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_163_mod(r, r, meth);

  CLEANUP:
       return res;
}

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mp_err ec_group_set_gf2m163 ( ECGroup *  group,
ECCurveName  name 
)

Definition at line 253 of file ec2_163.c.

{
       group->meth->field_mod = &ec_GF2m_163_mod;
       group->meth->field_mul = &ec_GF2m_163_mul;
       group->meth->field_sqr = &ec_GF2m_163_sqr;
       return MP_OKAY;
}

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