C++ (Cpp) BN_mod_inverse_ex Examples

Example #1

File: blinding.c Project: Wendy1106/Emma

static int bn_blinding_create_param(BN_BLINDING *b, BN_CTX *ctx,
                                    const BN_MONT_CTX *mont_ctx) {
  int retry_counter = 32;

  do {
    if (!BN_rand_range(b->A, b->mod)) {
      OPENSSL_PUT_ERROR(RSA, ERR_R_INTERNAL_ERROR);
      return 0;
    }

    int no_inverse;
    if (BN_mod_inverse_ex(b->Ai, &no_inverse, b->A, b->mod, ctx) == NULL) {
      /* this should almost never happen for good RSA keys */
      if (no_inverse) {
        if (retry_counter-- == 0) {
          OPENSSL_PUT_ERROR(RSA, RSA_R_TOO_MANY_ITERATIONS);
          return 0;
        }
        ERR_clear_error();
      } else {
        OPENSSL_PUT_ERROR(RSA, ERR_R_INTERNAL_ERROR);
        return 0;
      }
    } else {
      break;
    }
  } while (1);

  if (!BN_mod_exp_mont(b->A, b->A, b->e, b->mod, ctx, mont_ctx)) {
    OPENSSL_PUT_ERROR(RSA, ERR_R_INTERNAL_ERROR);
    return 0;
  }

  return 1;
}

Example #2

File: blinding.c Project: bheesham/boringssl

BN_BLINDING *BN_BLINDING_create_param(
    BN_BLINDING *b, const BIGNUM *e, BIGNUM *m, BN_CTX *ctx,
    int (*bn_mod_exp)(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
                      const BIGNUM *m, BN_CTX *ctx, const BN_MONT_CTX *mont),
    const BN_MONT_CTX *mont) {
  int retry_counter = 32;
  BN_BLINDING *ret = NULL;

  if (b == NULL) {
    ret = BN_BLINDING_new(NULL, NULL, m);
  } else {
    ret = b;
  }

  if (ret == NULL) {
    goto err;
  }

  if (ret->A == NULL && (ret->A = BN_new()) == NULL) {
    goto err;
  }
  if (ret->Ai == NULL && (ret->Ai = BN_new()) == NULL) {
    goto err;
  }

  if (e != NULL) {
    BN_free(ret->e);
    ret->e = BN_dup(e);
  }
  if (ret->e == NULL) {
    goto err;
  }

  if (bn_mod_exp != NULL) {
    ret->bn_mod_exp = bn_mod_exp;
  }
  if (mont != NULL) {
    ret->mont = mont;
  }

  do {
    if (!BN_rand_range(ret->A, ret->mod)) {
      goto err;
    }

    int no_inverse;
    if (BN_mod_inverse_ex(ret->Ai, &no_inverse, ret->A, ret->mod, ctx) == NULL) {
      /* this should almost never happen for good RSA keys */
      if (no_inverse) {
        if (retry_counter-- == 0) {
          OPENSSL_PUT_ERROR(RSA, RSA_R_TOO_MANY_ITERATIONS);
          goto err;
        }
        ERR_clear_error();
      } else {
        goto err;
      }
    } else {
      break;
    }
  } while (1);

  if (ret->bn_mod_exp != NULL && ret->mont != NULL) {
    if (!ret->bn_mod_exp(ret->A, ret->A, ret->e, ret->mod, ctx, ret->mont)) {
      goto err;
    }
  } else {
    if (!BN_mod_exp(ret->A, ret->A, ret->e, ret->mod, ctx)) {
      goto err;
    }
  }

  return ret;

err:
  if (b == NULL) {
    BN_BLINDING_free(ret);
    ret = NULL;
  }

  return ret;
}