crypto/ec/ec_mult.c:186: error: BUFFER_OVERRUN_L3
  Offset: [4, +oo] (⇐ [0, +oo] + 4) Size: [0, 8388607] by call to `BN_mul`.
Showing all 17 steps of the trace


crypto/ec/ec_mult.c:178:19: Call
176.       EC_POINT_BN_set_flags(s, BN_FLG_CONSTTIME);
177.   
178.       cardinality = BN_CTX_get(ctx);
                         ^
179.       lambda = BN_CTX_get(ctx);
180.       k = BN_CTX_get(ctx);

crypto/bn/bn_ctx.c:229:5: Call
  227.       }
  228.       /* OK, make sure the returned bignum is "zero" */
  229.       BN_zero(ret);
             ^
  230.       ctx->used++;
  231.       CTXDBG_RET(ctx, ret);

crypto/bn/bn_lib.c:359:1: Parameter `*a->d`
    357.   }
    358.   
    359. > int BN_set_word(BIGNUM *a, BN_ULONG w)
    360.   {
    361.       bn_check_top(a);

crypto/bn/bn_lib.c:362:9: Call
    360.   {
    361.       bn_check_top(a);
    362.       if (bn_expand(a, (int)sizeof(BN_ULONG) * 8) == NULL)
                   ^
    363.           return 0;
    364.       a->neg = 0;

crypto/bn/bn_lcl.h:660:1: Parameter `*a->d`
      658.                            const BIGNUM *add, const BIGNUM *rem, BN_CTX *ctx);
      659.   
      660. > static ossl_inline BIGNUM *bn_expand(BIGNUM *a, int bits)
      661.   {
      662.       if (bits > (INT_MAX - BN_BITS2 + 1))

crypto/ec/ec_mult.c:186:10: Call
184.       }
185.   
186.       if (!BN_mul(cardinality, group->order, group->cofactor, ctx)) {
                ^
187.           ECerr(EC_F_EC_SCALAR_MUL_LADDER, ERR_R_BN_LIB);
188.           goto err;

crypto/bn/bn_mul.c:497:1: Parameter `*r->d`
  495.   #endif                          /* BN_RECURSION */
  496.   
  497. > int BN_mul(BIGNUM *r, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
  498.   {
  499.       int ret = 0;

crypto/bn/bn_mul.c:575:21: Call
  573.                   if (bn_wexpand(t, k * 4) == NULL)
  574.                       goto err;
  575.                   if (bn_wexpand(rr, k * 4) == NULL)
                             ^
  576.                       goto err;
  577.                   bn_mul_part_recursive(rr->d, a->d, b->d,

crypto/bn/bn_lib.c:949:1: Parameter `*a->d`
    947.   }
    948.   
    949. > BIGNUM *bn_wexpand(BIGNUM *a, int words)
    950.   {
    951.       return (words <= a->dmax) ? a : bn_expand2(a, words);

crypto/bn/bn_mul.c:577:17: Call
  575.                   if (bn_wexpand(rr, k * 4) == NULL)
  576.                       goto err;
  577.                   bn_mul_part_recursive(rr->d, a->d, b->d,
                         ^
  578.                                         j, al - j, bl - j, t->d);
  579.               } else {            /* al <= j || bl <= j */

crypto/bn/bn_mul.c:322:1: Parameter `*t`
    320.    */
    321.   /* tnX may not be negative but less than n */
    322. > void bn_mul_part_recursive(BN_ULONG *r, BN_ULONG *a, BN_ULONG *b, int n,
    323.                              int tna, int tnb, BN_ULONG *t)
    324.   {

crypto/bn/bn_mul.c:382:9: Call
    380.       } else {
    381.           p = &(t[n2 * 2]);
    382.           bn_mul_recursive(&(t[n2]), t, &(t[n]), n, 0, 0, p);
                   ^
    383.           bn_mul_recursive(r, a, b, n, 0, 0, p);
    384.           i = n / 2;

crypto/bn/bn_mul.c:175:1: Parameter `*a`
      173.    */
      174.   /* dnX may not be positive, but n2/2+dnX has to be */
      175. > void bn_mul_recursive(BN_ULONG *r, BN_ULONG *a, BN_ULONG *b, int n2,
      176.                         int dna, int dnb, BN_ULONG *t)
      177.   {

crypto/bn/bn_mul.c:201:9: Call
      199.       /* Else do normal multiply */
      200.       if (n2 < BN_MUL_RECURSIVE_SIZE_NORMAL) {
      201.           bn_mul_normal(r, a, n2 + dna, b, n2 + dnb);
                     ^
      202.           if ((dna + dnb) < 0)
      203.               memset(&r[2 * n2 + dna + dnb], 0,

crypto/bn/bn_mul.c:612:1: <Length trace>
610.   }
611.   
612. > void bn_mul_normal(BN_ULONG *r, BN_ULONG *a, int na, BN_ULONG *b, int nb)
613.   {
614.       BN_ULONG *rr;

crypto/bn/bn_mul.c:612:1: Parameter `*b`
        610.   }
        611.   
        612. > void bn_mul_normal(BN_ULONG *r, BN_ULONG *a, int na, BN_ULONG *b, int nb)
        613.   {
        614.       BN_ULONG *rr;

crypto/bn/bn_mul.c:647:50: Array access: Offset: [4, +oo] (⇐ [0, +oo] + 4) Size: [0, 8388607] by call to `BN_mul` 
        645.           if (--nb <= 0)
        646.               return;
        647.           rr[4] = bn_mul_add_words(&(r[4]), a, na, b[4]);
                                                                ^
        648.           rr += 4;
        649.           r += 4;

void bn_mul_normal(BN_ULONG *r, BN_ULONG *a, int na, BN_ULONG *b, int nb)
{
    BN_ULONG *rr;
    if (na < nb) {
        int itmp;
        BN_ULONG *ltmp;
        itmp = na;
        na = nb;
        nb = itmp;
        ltmp = a;
        a = b;
        b = ltmp;
    }
    rr = &(r[na]);
    if (nb <= 0) {
        (void)bn_mul_words(r, a, na, 0);
        return;
    } else
        rr[0] = bn_mul_words(r, a, na, b[0]);
    for (;;) {
        if (--nb <= 0)
            return;
        rr[1] = bn_mul_add_words(&(r[1]), a, na, b[1]);
        if (--nb <= 0)
            return;
        rr[2] = bn_mul_add_words(&(r[2]), a, na, b[2]);
        if (--nb <= 0)
            return;
        rr[3] = bn_mul_add_words(&(r[3]), a, na, b[3]);
        if (--nb <= 0)
            return;
        rr[4] = bn_mul_add_words(&(r[4]), a, na, b[4]);
        rr += 4;
        r += 4;
        b += 4;
    }
}
['static\nint ec_scalar_mul_ladder(const EC_GROUP *group, EC_POINT *r,\n                         const BIGNUM *scalar, const EC_POINT *point,\n                         BN_CTX *ctx)\n{\n    int i, cardinality_bits, group_top, kbit, pbit, Z_is_one;\n    EC_POINT *p = NULL;\n    EC_POINT *s = NULL;\n    BIGNUM *k = NULL;\n    BIGNUM *lambda = NULL;\n    BIGNUM *cardinality = NULL;\n    BN_CTX *new_ctx = NULL;\n    int ret = 0;\n    if (point != NULL && EC_POINT_is_at_infinity(group, point))\n        return EC_POINT_set_to_infinity(group, r);\n    if (ctx == NULL && (ctx = new_ctx = BN_CTX_secure_new()) == NULL)\n        return 0;\n    BN_CTX_start(ctx);\n    if (((p = EC_POINT_new(group)) == NULL)\n        || ((s = EC_POINT_new(group)) == NULL)) {\n        ECerr(EC_F_EC_SCALAR_MUL_LADDER, ERR_R_MALLOC_FAILURE);\n        goto err;\n    }\n    if (point == NULL) {\n        if (!EC_POINT_copy(p, group->generator)) {\n            ECerr(EC_F_EC_SCALAR_MUL_LADDER, ERR_R_EC_LIB);\n            goto err;\n        }\n    } else {\n        if (!EC_POINT_copy(p, point)) {\n            ECerr(EC_F_EC_SCALAR_MUL_LADDER, ERR_R_EC_LIB);\n            goto err;\n        }\n    }\n    EC_POINT_BN_set_flags(p, BN_FLG_CONSTTIME);\n    EC_POINT_BN_set_flags(r, BN_FLG_CONSTTIME);\n    EC_POINT_BN_set_flags(s, BN_FLG_CONSTTIME);\n    cardinality = BN_CTX_get(ctx);\n    lambda = BN_CTX_get(ctx);\n    k = BN_CTX_get(ctx);\n    if (k == NULL) {\n        ECerr(EC_F_EC_SCALAR_MUL_LADDER, ERR_R_MALLOC_FAILURE);\n        goto err;\n    }\n    if (!BN_mul(cardinality, group->order, group->cofactor, ctx)) {\n        ECerr(EC_F_EC_SCALAR_MUL_LADDER, ERR_R_BN_LIB);\n        goto err;\n    }\n    cardinality_bits = BN_num_bits(cardinality);\n    group_top = bn_get_top(cardinality);\n    if ((bn_wexpand(k, group_top + 1) == NULL)\n        || (bn_wexpand(lambda, group_top + 1) == NULL)) {\n        ECerr(EC_F_EC_SCALAR_MUL_LADDER, ERR_R_BN_LIB);\n        goto err;\n    }\n    if (!BN_copy(k, scalar)) {\n        ECerr(EC_F_EC_SCALAR_MUL_LADDER, ERR_R_BN_LIB);\n        goto err;\n    }\n    BN_set_flags(k, BN_FLG_CONSTTIME);\n    if ((BN_num_bits(k) > cardinality_bits) || (BN_is_negative(k))) {\n        if (!BN_nnmod(k, k, cardinality, ctx)) {\n            ECerr(EC_F_EC_SCALAR_MUL_LADDER, ERR_R_BN_LIB);\n            goto err;\n        }\n    }\n    if (!BN_add(lambda, k, cardinality)) {\n        ECerr(EC_F_EC_SCALAR_MUL_LADDER, ERR_R_BN_LIB);\n        goto err;\n    }\n    BN_set_flags(lambda, BN_FLG_CONSTTIME);\n    if (!BN_add(k, lambda, cardinality)) {\n        ECerr(EC_F_EC_SCALAR_MUL_LADDER, ERR_R_BN_LIB);\n        goto err;\n    }\n    kbit = BN_is_bit_set(lambda, cardinality_bits);\n    BN_consttime_swap(kbit, k, lambda, group_top + 1);\n    group_top = bn_get_top(group->field);\n    if ((bn_wexpand(s->X, group_top) == NULL)\n        || (bn_wexpand(s->Y, group_top) == NULL)\n        || (bn_wexpand(s->Z, group_top) == NULL)\n        || (bn_wexpand(r->X, group_top) == NULL)\n        || (bn_wexpand(r->Y, group_top) == NULL)\n        || (bn_wexpand(r->Z, group_top) == NULL)\n        || (bn_wexpand(p->X, group_top) == NULL)\n        || (bn_wexpand(p->Y, group_top) == NULL)\n        || (bn_wexpand(p->Z, group_top) == NULL)) {\n        ECerr(EC_F_EC_SCALAR_MUL_LADDER, ERR_R_BN_LIB);\n        goto err;\n    }\n    if (!ec_point_blind_coordinates(group, p, ctx)) {\n        ECerr(EC_F_EC_SCALAR_MUL_LADDER, EC_R_POINT_COORDINATES_BLIND_FAILURE);\n        goto err;\n    }\n    if (!ec_point_ladder_pre(group, r, s, p, ctx)) {\n        ECerr(EC_F_EC_SCALAR_MUL_LADDER, EC_R_LADDER_PRE_FAILURE);\n        goto err;\n    }\n    pbit = 1;\n#define EC_POINT_CSWAP(c, a, b, w, t) do {         \\\n        BN_consttime_swap(c, (a)->X, (b)->X, w);   \\\n        BN_consttime_swap(c, (a)->Y, (b)->Y, w);   \\\n        BN_consttime_swap(c, (a)->Z, (b)->Z, w);   \\\n        t = ((a)->Z_is_one ^ (b)->Z_is_one) & (c); \\\n        (a)->Z_is_one ^= (t);                      \\\n        (b)->Z_is_one ^= (t);                      \\\n} while(0)\n    for (i = cardinality_bits - 1; i >= 0; i--) {\n        kbit = BN_is_bit_set(k, i) ^ pbit;\n        EC_POINT_CSWAP(kbit, r, s, group_top, Z_is_one);\n        if (!ec_point_ladder_step(group, r, s, p, ctx)) {\n            ECerr(EC_F_EC_SCALAR_MUL_LADDER, EC_R_LADDER_STEP_FAILURE);\n            goto err;\n        }\n        pbit ^= kbit;\n    }\n    EC_POINT_CSWAP(pbit, r, s, group_top, Z_is_one);\n#undef EC_POINT_CSWAP\n    if (!ec_point_ladder_post(group, r, s, p, ctx)) {\n        ECerr(EC_F_EC_SCALAR_MUL_LADDER, EC_R_LADDER_POST_FAILURE);\n        goto err;\n    }\n    ret = 1;\n err:\n    EC_POINT_free(p);\n    EC_POINT_free(s);\n    BN_CTX_end(ctx);\n    BN_CTX_free(new_ctx);\n    return ret;\n}', 'BIGNUM *BN_CTX_get(BN_CTX *ctx)\n{\n    BIGNUM *ret;\n    CTXDBG_ENTRY("BN_CTX_get", ctx);\n    if (ctx->err_stack || ctx->too_many)\n        return NULL;\n    if ((ret = BN_POOL_get(&ctx->pool, ctx->flags)) == NULL) {\n        ctx->too_many = 1;\n        BNerr(BN_F_BN_CTX_GET, BN_R_TOO_MANY_TEMPORARY_VARIABLES);\n        return NULL;\n    }\n    BN_zero(ret);\n    ctx->used++;\n    CTXDBG_RET(ctx, ret);\n    return ret;\n}', 'int BN_set_word(BIGNUM *a, BN_ULONG w)\n{\n    bn_check_top(a);\n    if (bn_expand(a, (int)sizeof(BN_ULONG) * 8) == NULL)\n        return 0;\n    a->neg = 0;\n    a->d[0] = w;\n    a->top = (w ? 1 : 0);\n    a->flags &= ~BN_FLG_FIXED_TOP;\n    bn_check_top(a);\n    return 1;\n}', 'static ossl_inline BIGNUM *bn_expand(BIGNUM *a, int bits)\n{\n    if (bits > (INT_MAX - BN_BITS2 + 1))\n        return NULL;\n    if (((bits+BN_BITS2-1)/BN_BITS2) <= (a)->dmax)\n        return a;\n    return bn_expand2((a),(bits+BN_BITS2-1)/BN_BITS2);\n}', 'int BN_mul(BIGNUM *r, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)\n{\n    int ret = 0;\n    int top, al, bl;\n    BIGNUM *rr;\n#if defined(BN_MUL_COMBA) || defined(BN_RECURSION)\n    int i;\n#endif\n#ifdef BN_RECURSION\n    BIGNUM *t = NULL;\n    int j = 0, k;\n#endif\n    bn_check_top(a);\n    bn_check_top(b);\n    bn_check_top(r);\n    al = a->top;\n    bl = b->top;\n    if ((al == 0) || (bl == 0)) {\n        BN_zero(r);\n        return 1;\n    }\n    top = al + bl;\n    BN_CTX_start(ctx);\n    if ((r == a) || (r == b)) {\n        if ((rr = BN_CTX_get(ctx)) == NULL)\n            goto err;\n    } else\n        rr = r;\n#if defined(BN_MUL_COMBA) || defined(BN_RECURSION)\n    i = al - bl;\n#endif\n#ifdef BN_MUL_COMBA\n    if (i == 0) {\n# if 0\n        if (al == 4) {\n            if (bn_wexpand(rr, 8) == NULL)\n                goto err;\n            rr->top = 8;\n            bn_mul_comba4(rr->d, a->d, b->d);\n            goto end;\n        }\n# endif\n        if (al == 8) {\n            if (bn_wexpand(rr, 16) == NULL)\n                goto err;\n            rr->top = 16;\n            bn_mul_comba8(rr->d, a->d, b->d);\n            goto end;\n        }\n    }\n#endif\n#ifdef BN_RECURSION\n    if ((al >= BN_MULL_SIZE_NORMAL) && (bl >= BN_MULL_SIZE_NORMAL)) {\n        if (i >= -1 && i <= 1) {\n            if (i >= 0) {\n                j = BN_num_bits_word((BN_ULONG)al);\n            }\n            if (i == -1) {\n                j = BN_num_bits_word((BN_ULONG)bl);\n            }\n            j = 1 << (j - 1);\n            assert(j <= al || j <= bl);\n            k = j + j;\n            t = BN_CTX_get(ctx);\n            if (t == NULL)\n                goto err;\n            if (al > j || bl > j) {\n                if (bn_wexpand(t, k * 4) == NULL)\n                    goto err;\n                if (bn_wexpand(rr, k * 4) == NULL)\n                    goto err;\n                bn_mul_part_recursive(rr->d, a->d, b->d,\n                                      j, al - j, bl - j, t->d);\n            } else {\n                if (bn_wexpand(t, k * 2) == NULL)\n                    goto err;\n                if (bn_wexpand(rr, k * 2) == NULL)\n                    goto err;\n                bn_mul_recursive(rr->d, a->d, b->d, j, al - j, bl - j, t->d);\n            }\n            rr->top = top;\n            goto end;\n        }\n    }\n#endif\n    if (bn_wexpand(rr, top) == NULL)\n        goto err;\n    rr->top = top;\n    bn_mul_normal(rr->d, a->d, al, b->d, bl);\n#if defined(BN_MUL_COMBA) || defined(BN_RECURSION)\n end:\n#endif\n    rr->neg = a->neg ^ b->neg;\n    bn_correct_top(rr);\n    if (r != rr && BN_copy(r, rr) == NULL)\n        goto err;\n    ret = 1;\n err:\n    bn_check_top(r);\n    BN_CTX_end(ctx);\n    return ret;\n}', 'BIGNUM *bn_wexpand(BIGNUM *a, int words)\n{\n    return (words <= a->dmax) ? a : bn_expand2(a, words);\n}', 'void bn_mul_part_recursive(BN_ULONG *r, BN_ULONG *a, BN_ULONG *b, int n,\n                           int tna, int tnb, BN_ULONG *t)\n{\n    int i, j, n2 = n * 2;\n    int c1, c2, neg;\n    BN_ULONG ln, lo, *p;\n    if (n < 8) {\n        bn_mul_normal(r, a, n + tna, b, n + tnb);\n        return;\n    }\n    c1 = bn_cmp_part_words(a, &(a[n]), tna, n - tna);\n    c2 = bn_cmp_part_words(&(b[n]), b, tnb, tnb - n);\n    neg = 0;\n    switch (c1 * 3 + c2) {\n    case -4:\n        bn_sub_part_words(t, &(a[n]), a, tna, tna - n);\n        bn_sub_part_words(&(t[n]), b, &(b[n]), tnb, n - tnb);\n        break;\n    case -3:\n    case -2:\n        bn_sub_part_words(t, &(a[n]), a, tna, tna - n);\n        bn_sub_part_words(&(t[n]), &(b[n]), b, tnb, tnb - n);\n        neg = 1;\n        break;\n    case -1:\n    case 0:\n    case 1:\n    case 2:\n        bn_sub_part_words(t, a, &(a[n]), tna, n - tna);\n        bn_sub_part_words(&(t[n]), b, &(b[n]), tnb, n - tnb);\n        neg = 1;\n        break;\n    case 3:\n    case 4:\n        bn_sub_part_words(t, a, &(a[n]), tna, n - tna);\n        bn_sub_part_words(&(t[n]), &(b[n]), b, tnb, tnb - n);\n        break;\n    }\n# if 0\n    if (n == 4) {\n        bn_mul_comba4(&(t[n2]), t, &(t[n]));\n        bn_mul_comba4(r, a, b);\n        bn_mul_normal(&(r[n2]), &(a[n]), tn, &(b[n]), tn);\n        memset(&r[n2 + tn * 2], 0, sizeof(*r) * (n2 - tn * 2));\n    } else\n# endif\n    if (n == 8) {\n        bn_mul_comba8(&(t[n2]), t, &(t[n]));\n        bn_mul_comba8(r, a, b);\n        bn_mul_normal(&(r[n2]), &(a[n]), tna, &(b[n]), tnb);\n        memset(&r[n2 + tna + tnb], 0, sizeof(*r) * (n2 - tna - tnb));\n    } else {\n        p = &(t[n2 * 2]);\n        bn_mul_recursive(&(t[n2]), t, &(t[n]), n, 0, 0, p);\n        bn_mul_recursive(r, a, b, n, 0, 0, p);\n        i = n / 2;\n        if (tna > tnb)\n            j = tna - i;\n        else\n            j = tnb - i;\n        if (j == 0) {\n            bn_mul_recursive(&(r[n2]), &(a[n]), &(b[n]),\n                             i, tna - i, tnb - i, p);\n            memset(&r[n2 + i * 2], 0, sizeof(*r) * (n2 - i * 2));\n        } else if (j > 0) {\n            bn_mul_part_recursive(&(r[n2]), &(a[n]), &(b[n]),\n                                  i, tna - i, tnb - i, p);\n            memset(&(r[n2 + tna + tnb]), 0,\n                   sizeof(BN_ULONG) * (n2 - tna - tnb));\n        } else {\n            memset(&r[n2], 0, sizeof(*r) * n2);\n            if (tna < BN_MUL_RECURSIVE_SIZE_NORMAL\n                && tnb < BN_MUL_RECURSIVE_SIZE_NORMAL) {\n                bn_mul_normal(&(r[n2]), &(a[n]), tna, &(b[n]), tnb);\n            } else {\n                for (;;) {\n                    i /= 2;\n                    if (i < tna || i < tnb) {\n                        bn_mul_part_recursive(&(r[n2]),\n                                              &(a[n]), &(b[n]),\n                                              i, tna - i, tnb - i, p);\n                        break;\n                    } else if (i == tna || i == tnb) {\n                        bn_mul_recursive(&(r[n2]),\n                                         &(a[n]), &(b[n]),\n                                         i, tna - i, tnb - i, p);\n                        break;\n                    }\n                }\n            }\n        }\n    }\n    c1 = (int)(bn_add_words(t, r, &(r[n2]), n2));\n    if (neg) {\n        c1 -= (int)(bn_sub_words(&(t[n2]), t, &(t[n2]), n2));\n    } else {\n        c1 += (int)(bn_add_words(&(t[n2]), &(t[n2]), t, n2));\n    }\n    c1 += (int)(bn_add_words(&(r[n]), &(r[n]), &(t[n2]), n2));\n    if (c1) {\n        p = &(r[n + n2]);\n        lo = *p;\n        ln = (lo + c1) & BN_MASK2;\n        *p = ln;\n        if (ln < (BN_ULONG)c1) {\n            do {\n                p++;\n                lo = *p;\n                ln = (lo + 1) & BN_MASK2;\n                *p = ln;\n            } while (ln == 0);\n        }\n    }\n}', 'void bn_mul_recursive(BN_ULONG *r, BN_ULONG *a, BN_ULONG *b, int n2,\n                      int dna, int dnb, BN_ULONG *t)\n{\n    int n = n2 / 2, c1, c2;\n    int tna = n + dna, tnb = n + dnb;\n    unsigned int neg, zero;\n    BN_ULONG ln, lo, *p;\n# ifdef BN_MUL_COMBA\n#  if 0\n    if (n2 == 4) {\n        bn_mul_comba4(r, a, b);\n        return;\n    }\n#  endif\n    if (n2 == 8 && dna == 0 && dnb == 0) {\n        bn_mul_comba8(r, a, b);\n        return;\n    }\n# endif\n    if (n2 < BN_MUL_RECURSIVE_SIZE_NORMAL) {\n        bn_mul_normal(r, a, n2 + dna, b, n2 + dnb);\n        if ((dna + dnb) < 0)\n            memset(&r[2 * n2 + dna + dnb], 0,\n                   sizeof(BN_ULONG) * -(dna + dnb));\n        return;\n    }\n    c1 = bn_cmp_part_words(a, &(a[n]), tna, n - tna);\n    c2 = bn_cmp_part_words(&(b[n]), b, tnb, tnb - n);\n    zero = neg = 0;\n    switch (c1 * 3 + c2) {\n    case -4:\n        bn_sub_part_words(t, &(a[n]), a, tna, tna - n);\n        bn_sub_part_words(&(t[n]), b, &(b[n]), tnb, n - tnb);\n        break;\n    case -3:\n        zero = 1;\n        break;\n    case -2:\n        bn_sub_part_words(t, &(a[n]), a, tna, tna - n);\n        bn_sub_part_words(&(t[n]), &(b[n]), b, tnb, tnb - n);\n        neg = 1;\n        break;\n    case -1:\n    case 0:\n    case 1:\n        zero = 1;\n        break;\n    case 2:\n        bn_sub_part_words(t, a, &(a[n]), tna, n - tna);\n        bn_sub_part_words(&(t[n]), b, &(b[n]), tnb, n - tnb);\n        neg = 1;\n        break;\n    case 3:\n        zero = 1;\n        break;\n    case 4:\n        bn_sub_part_words(t, a, &(a[n]), tna, n - tna);\n        bn_sub_part_words(&(t[n]), &(b[n]), b, tnb, tnb - n);\n        break;\n    }\n# ifdef BN_MUL_COMBA\n    if (n == 4 && dna == 0 && dnb == 0) {\n        if (!zero)\n            bn_mul_comba4(&(t[n2]), t, &(t[n]));\n        else\n            memset(&t[n2], 0, sizeof(*t) * 8);\n        bn_mul_comba4(r, a, b);\n        bn_mul_comba4(&(r[n2]), &(a[n]), &(b[n]));\n    } else if (n == 8 && dna == 0 && dnb == 0) {\n        if (!zero)\n            bn_mul_comba8(&(t[n2]), t, &(t[n]));\n        else\n            memset(&t[n2], 0, sizeof(*t) * 16);\n        bn_mul_comba8(r, a, b);\n        bn_mul_comba8(&(r[n2]), &(a[n]), &(b[n]));\n    } else\n# endif\n    {\n        p = &(t[n2 * 2]);\n        if (!zero)\n            bn_mul_recursive(&(t[n2]), t, &(t[n]), n, 0, 0, p);\n        else\n            memset(&t[n2], 0, sizeof(*t) * n2);\n        bn_mul_recursive(r, a, b, n, 0, 0, p);\n        bn_mul_recursive(&(r[n2]), &(a[n]), &(b[n]), n, dna, dnb, p);\n    }\n    c1 = (int)(bn_add_words(t, r, &(r[n2]), n2));\n    if (neg) {\n        c1 -= (int)(bn_sub_words(&(t[n2]), t, &(t[n2]), n2));\n    } else {\n        c1 += (int)(bn_add_words(&(t[n2]), &(t[n2]), t, n2));\n    }\n    c1 += (int)(bn_add_words(&(r[n]), &(r[n]), &(t[n2]), n2));\n    if (c1) {\n        p = &(r[n + n2]);\n        lo = *p;\n        ln = (lo + c1) & BN_MASK2;\n        *p = ln;\n        if (ln < (BN_ULONG)c1) {\n            do {\n                p++;\n                lo = *p;\n                ln = (lo + 1) & BN_MASK2;\n                *p = ln;\n            } while (ln == 0);\n        }\n    }\n}', 'void bn_mul_normal(BN_ULONG *r, BN_ULONG *a, int na, BN_ULONG *b, int nb)\n{\n    BN_ULONG *rr;\n    if (na < nb) {\n        int itmp;\n        BN_ULONG *ltmp;\n        itmp = na;\n        na = nb;\n        nb = itmp;\n        ltmp = a;\n        a = b;\n        b = ltmp;\n    }\n    rr = &(r[na]);\n    if (nb <= 0) {\n        (void)bn_mul_words(r, a, na, 0);\n        return;\n    } else\n        rr[0] = bn_mul_words(r, a, na, b[0]);\n    for (;;) {\n        if (--nb <= 0)\n            return;\n        rr[1] = bn_mul_add_words(&(r[1]), a, na, b[1]);\n        if (--nb <= 0)\n            return;\n        rr[2] = bn_mul_add_words(&(r[2]), a, na, b[2]);\n        if (--nb <= 0)\n            return;\n        rr[3] = bn_mul_add_words(&(r[3]), a, na, b[3]);\n        if (--nb <= 0)\n            return;\n        rr[4] = bn_mul_add_words(&(r[4]), a, na, b[4]);\n        rr += 4;\n        r += 4;\n        b += 4;\n    }\n}']