apps/s_client.c:287: error: BUFFER_OVERRUN_L3
  Offset: [1, +oo] Size: [0, 8388607] by call to `BN_is_prime_ex`.
Showing all 21 steps of the trace


apps/s_client.c:284:9: Call
282.       int ret =
283.           g != NULL && N != NULL && bn_ctx != NULL && BN_is_odd(N) &&
284.           BN_is_prime_ex(N, SRP_NUMBER_ITERATIONS_FOR_PRIME, bn_ctx, NULL) == 1 &&
               ^
285.           p != NULL && BN_rshift1(p, N) &&
286.           /* p = (N-1)/2 */

crypto/bn/bn_prime.c:182:12: Call
  180.                      BN_GENCB *cb)
  181.   {
  182.       return BN_is_prime_fasttest_ex(a, checks, ctx_passed, 0, cb);
                    ^
  183.   }
  184.   

crypto/bn/bn_prime.c:223:11: Call
    221.           goto err;
    222.   
    223.       ret = bn_miller_rabin_is_prime(w, checks, ctx, cb, 0, &status);
                     ^
    224.       if (!ret)
    225.           goto err;

crypto/bn/bn_prime.c:315:14: Call
      313.           }
      314.           /* (Step 4.5) z = b^m mod w */
      315.           if (!BN_mod_exp_mont(z, b, m, w, ctx, mont))
                          ^
      316.               goto err;
      317.           /* (Step 4.6) if (z = 1 or z = w-1) */

crypto/bn/bn_exp.c:354:14: Call
        352.   
        353.       if (a->neg || BN_ucmp(a, m) >= 0) {
        354.           if (!BN_nnmod(val[0], a, m, ctx))
                            ^
        355.               goto err;
        356.           aa = val[0];

crypto/bn/bn_mod.c:20:11: Call
          18.        */
          19.   
          20.       if (!(BN_mod(r, m, d, ctx)))
                          ^
          21.           return 0;
          22.       if (!r->neg)

crypto/bn/bn_div.c:209:1: Parameter `*dv->d`
            207.    * If 'dv' or 'rm' is NULL, the respective value is not returned.
            208.    */
            209. > int BN_div(BIGNUM *dv, BIGNUM *rm, const BIGNUM *num, const BIGNUM *divisor,
            210.              BN_CTX *ctx)
            211.   {

apps/s_client.c:285:22: Call
283.           g != NULL && N != NULL && bn_ctx != NULL && BN_is_odd(N) &&
284.           BN_is_prime_ex(N, SRP_NUMBER_ITERATIONS_FOR_PRIME, bn_ctx, NULL) == 1 &&
285.           p != NULL && BN_rshift1(p, N) &&
                            ^
286.           /* p = (N-1)/2 */
287.           BN_is_prime_ex(p, SRP_NUMBER_ITERATIONS_FOR_PRIME, bn_ctx, NULL) == 1 &&

crypto/bn/bn_shift.c:47:1: Parameter `*r->d`
  45.   }
  46.   
  47. > int BN_rshift1(BIGNUM *r, const BIGNUM *a)
  48.   {
  49.       BN_ULONG *ap, *rp, t, c;

apps/s_client.c:287:9: Call
285.           p != NULL && BN_rshift1(p, N) &&
286.           /* p = (N-1)/2 */
287.           BN_is_prime_ex(p, SRP_NUMBER_ITERATIONS_FOR_PRIME, bn_ctx, NULL) == 1 &&
               ^
288.           r != NULL &&
289.           /* verify g^((N-1)/2) == -1 (mod N) */

crypto/bn/bn_prime.c:179:1: Parameter `*a->d`
  177.   }
  178.   
  179. > int BN_is_prime_ex(const BIGNUM *a, int checks, BN_CTX *ctx_passed,
  180.                      BN_GENCB *cb)
  181.   {

crypto/bn/bn_prime.c:182:12: Call
  180.                      BN_GENCB *cb)
  181.   {
  182.       return BN_is_prime_fasttest_ex(a, checks, ctx_passed, 0, cb);
                    ^
  183.   }
  184.   

crypto/bn/bn_prime.c:186:1: Parameter `*w->d`
    184.   
    185.   /* See FIPS 186-4 C.3.1 Miller Rabin Probabilistic Primality Test. */
    186. > int BN_is_prime_fasttest_ex(const BIGNUM *w, int checks, BN_CTX *ctx_passed,
    187.                               int do_trial_division, BN_GENCB *cb)
    188.   {

crypto/bn/bn_prime.c:223:11: Call
    221.           goto err;
    222.   
    223.       ret = bn_miller_rabin_is_prime(w, checks, ctx, cb, 0, &status);
                     ^
    224.       if (!ret)
    225.           goto err;

crypto/bn/bn_prime.c:248:1: Parameter `*w->d`
      246.    * returns 0 if there was an error, otherwise it returns 1.
      247.    */
      248. > int bn_miller_rabin_is_prime(const BIGNUM *w, int iterations, BN_CTX *ctx,
      249.                                BN_GENCB *cb, int enhanced, int *status)
      250.   {

crypto/bn/bn_prime.c:315:14: Call
      313.           }
      314.           /* (Step 4.5) z = b^m mod w */
      315.           if (!BN_mod_exp_mont(z, b, m, w, ctx, mont))
                          ^
      316.               goto err;
      317.           /* (Step 4.6) if (z = 1 or z = w-1) */

crypto/bn/bn_exp.c:388:14: <Offset trace>
386.           /* 2^(top*BN_BITS2) - m */
387.           r->d[0] = (0 - m->d[0]) & BN_MASK2;
388.           for (i = 1; i < j; i++)
                    ^
389.               r->d[i] = (~m->d[i]) & BN_MASK2;
390.           r->top = j;

crypto/bn/bn_exp.c:388:14: Assignment
        386.           /* 2^(top*BN_BITS2) - m */
        387.           r->d[0] = (0 - m->d[0]) & BN_MASK2;
        388.           for (i = 1; i < j; i++)
                            ^
        389.               r->d[i] = (~m->d[i]) & BN_MASK2;
        390.           r->top = j;

crypto/bn/bn_exp.c:296:1: <Length trace>
294.   }
295.   
296. > int BN_mod_exp_mont(BIGNUM *rr, const BIGNUM *a, const BIGNUM *p,
297.                       const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *in_mont)
298.   {

crypto/bn/bn_exp.c:296:1: Parameter `*m->d`
        294.   }
        295.   
        296. > int BN_mod_exp_mont(BIGNUM *rr, const BIGNUM *a, const BIGNUM *p,
        297.                       const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *in_mont)
        298.   {

crypto/bn/bn_exp.c:389:25: Array access: Offset: [1, +oo] Size: [0, 8388607] by call to `BN_is_prime_ex` 
        387.           r->d[0] = (0 - m->d[0]) & BN_MASK2;
        388.           for (i = 1; i < j; i++)
        389.               r->d[i] = (~m->d[i]) & BN_MASK2;
                                       ^
        390.           r->top = j;
        391.           r->flags |= BN_FLG_FIXED_TOP;

int BN_mod_exp_mont(BIGNUM *rr, const BIGNUM *a, const BIGNUM *p,
                    const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *in_mont)
{
    int i, j, bits, ret = 0, wstart, wend, window, wvalue;
    int start = 1;
    BIGNUM *d, *r;
    const BIGNUM *aa;
    BIGNUM *val[TABLE_SIZE];
    BN_MONT_CTX *mont = NULL;
    if (BN_get_flags(p, BN_FLG_CONSTTIME) != 0
            || BN_get_flags(a, BN_FLG_CONSTTIME) != 0
            || BN_get_flags(m, BN_FLG_CONSTTIME) != 0) {
        return BN_mod_exp_mont_consttime(rr, a, p, m, ctx, in_mont);
    }
    bn_check_top(a);
    bn_check_top(p);
    bn_check_top(m);
    if (!BN_is_odd(m)) {
        BNerr(BN_F_BN_MOD_EXP_MONT, BN_R_CALLED_WITH_EVEN_MODULUS);
        return 0;
    }
    bits = BN_num_bits(p);
    if (bits == 0) {
        if (BN_abs_is_word(m, 1)) {
            ret = 1;
            BN_zero(rr);
        } else {
            ret = BN_one(rr);
        }
        return ret;
    }
    BN_CTX_start(ctx);
    d = BN_CTX_get(ctx);
    r = BN_CTX_get(ctx);
    val[0] = BN_CTX_get(ctx);
    if (val[0] == NULL)
        goto err;
    if (in_mont != NULL)
        mont = in_mont;
    else {
        if ((mont = BN_MONT_CTX_new()) == NULL)
            goto err;
        if (!BN_MONT_CTX_set(mont, m, ctx))
            goto err;
    }
    if (a->neg || BN_ucmp(a, m) >= 0) {
        if (!BN_nnmod(val[0], a, m, ctx))
            goto err;
        aa = val[0];
    } else
        aa = a;
    if (!bn_to_mont_fixed_top(val[0], aa, mont, ctx))
        goto err;
    window = BN_window_bits_for_exponent_size(bits);
    if (window > 1) {
        if (!bn_mul_mont_fixed_top(d, val[0], val[0], mont, ctx))
            goto err;
        j = 1 << (window - 1);
        for (i = 1; i < j; i++) {
            if (((val[i] = BN_CTX_get(ctx)) == NULL) ||
                !bn_mul_mont_fixed_top(val[i], val[i - 1], d, mont, ctx))
                goto err;
        }
    }
    start = 1;
    wvalue = 0;
    wstart = bits - 1;
    wend = 0;
#if 1
    j = m->top;
    if (m->d[j - 1] & (((BN_ULONG)1) << (BN_BITS2 - 1))) {
        if (bn_wexpand(r, j) == NULL)
            goto err;
        r->d[0] = (0 - m->d[0]) & BN_MASK2;
        for (i = 1; i < j; i++)
            r->d[i] = (~m->d[i]) & BN_MASK2;
        r->top = j;
        r->flags |= BN_FLG_FIXED_TOP;
    } else
#endif
    if (!bn_to_mont_fixed_top(r, BN_value_one(), mont, ctx))
        goto err;
    for (;;) {
        if (BN_is_bit_set(p, wstart) == 0) {
            if (!start) {
                if (!bn_mul_mont_fixed_top(r, r, r, mont, ctx))
                    goto err;
            }
            if (wstart == 0)
                break;
            wstart--;
            continue;
        }
        j = wstart;
        wvalue = 1;
        wend = 0;
        for (i = 1; i < window; i++) {
            if (wstart - i < 0)
                break;
            if (BN_is_bit_set(p, wstart - i)) {
                wvalue <<= (i - wend);
                wvalue |= 1;
                wend = i;
            }
        }
        j = wend + 1;
        if (!start)
            for (i = 0; i < j; i++) {
                if (!bn_mul_mont_fixed_top(r, r, r, mont, ctx))
                    goto err;
            }
        if (!bn_mul_mont_fixed_top(r, r, val[wvalue >> 1], mont, ctx))
            goto err;
        wstart -= wend + 1;
        wvalue = 0;
        start = 0;
        if (wstart < 0)
            break;
    }
#if defined(SPARC_T4_MONT)
    if (OPENSSL_sparcv9cap_P[0] & (SPARCV9_VIS3 | SPARCV9_PREFER_FPU)) {
        j = mont->N.top;
        val[0]->d[0] = 1;
        for (i = 1; i < j; i++)
            val[0]->d[i] = 0;
        val[0]->top = j;
        if (!BN_mod_mul_montgomery(rr, r, val[0], mont, ctx))
            goto err;
    } else
#endif
    if (!BN_from_montgomery(rr, r, mont, ctx))
        goto err;
    ret = 1;
 err:
    if (in_mont == NULL)
        BN_MONT_CTX_free(mont);
    BN_CTX_end(ctx);
    bn_check_top(rr);
    return ret;
}
['static int srp_Verify_N_and_g(const BIGNUM *N, const BIGNUM *g)\n{\n    BN_CTX *bn_ctx = BN_CTX_new();\n    BIGNUM *p = BN_new();\n    BIGNUM *r = BN_new();\n    int ret =\n        g != NULL && N != NULL && bn_ctx != NULL && BN_is_odd(N) &&\n        BN_is_prime_ex(N, SRP_NUMBER_ITERATIONS_FOR_PRIME, bn_ctx, NULL) == 1 &&\n        p != NULL && BN_rshift1(p, N) &&\n        BN_is_prime_ex(p, SRP_NUMBER_ITERATIONS_FOR_PRIME, bn_ctx, NULL) == 1 &&\n        r != NULL &&\n        BN_mod_exp(r, g, p, N, bn_ctx) &&\n        BN_add_word(r, 1) && BN_cmp(r, N) == 0;\n    BN_free(r);\n    BN_free(p);\n    BN_CTX_free(bn_ctx);\n    return ret;\n}', 'int BN_is_prime_ex(const BIGNUM *a, int checks, BN_CTX *ctx_passed,\n                   BN_GENCB *cb)\n{\n    return BN_is_prime_fasttest_ex(a, checks, ctx_passed, 0, cb);\n}', 'int BN_is_prime_fasttest_ex(const BIGNUM *w, int checks, BN_CTX *ctx_passed,\n                            int do_trial_division, BN_GENCB *cb)\n{\n    int i, status, ret = -1;\n    BN_CTX *ctx = NULL;\n    if (BN_cmp(w, BN_value_one()) <= 0)\n        return 0;\n    if (BN_is_odd(w)) {\n        if (BN_is_word(w, 3))\n            return 1;\n    } else {\n        return BN_is_word(w, 2);\n    }\n    if (do_trial_division) {\n        for (i = 1; i < NUMPRIMES; i++) {\n            BN_ULONG mod = BN_mod_word(w, primes[i]);\n            if (mod == (BN_ULONG)-1)\n                return -1;\n            if (mod == 0)\n                return BN_is_word(w, primes[i]);\n        }\n        if (!BN_GENCB_call(cb, 1, -1))\n            return -1;\n    }\n    if (ctx_passed != NULL)\n        ctx = ctx_passed;\n    else if ((ctx = BN_CTX_new()) == NULL)\n        goto err;\n    ret = bn_miller_rabin_is_prime(w, checks, ctx, cb, 0, &status);\n    if (!ret)\n        goto err;\n    ret = (status == BN_PRIMETEST_PROBABLY_PRIME);\nerr:\n    if (ctx_passed == NULL)\n        BN_CTX_free(ctx);\n    return ret;\n}', 'int bn_miller_rabin_is_prime(const BIGNUM *w, int iterations, BN_CTX *ctx,\n                             BN_GENCB *cb, int enhanced, int *status)\n{\n    int i, j, a, ret = 0;\n    BIGNUM *g, *w1, *w3, *x, *m, *z, *b;\n    BN_MONT_CTX *mont = NULL;\n    if (!BN_is_odd(w))\n        return 0;\n    BN_CTX_start(ctx);\n    g = BN_CTX_get(ctx);\n    w1 = BN_CTX_get(ctx);\n    w3 = BN_CTX_get(ctx);\n    x = BN_CTX_get(ctx);\n    m = BN_CTX_get(ctx);\n    z = BN_CTX_get(ctx);\n    b = BN_CTX_get(ctx);\n    if (!(b != NULL\n            && BN_copy(w1, w)\n            && BN_sub_word(w1, 1)\n            && BN_copy(w3, w)\n            && BN_sub_word(w3, 3)))\n        goto err;\n    if (BN_is_zero(w3) || BN_is_negative(w3))\n        goto err;\n    a = 1;\n    while (!BN_is_bit_set(w1, a))\n        a++;\n    if (!BN_rshift(m, w1, a))\n        goto err;\n    mont = BN_MONT_CTX_new();\n    if (mont == NULL || !BN_MONT_CTX_set(mont, w, ctx))\n        goto err;\n    if (iterations == BN_prime_checks)\n        iterations = BN_prime_checks_for_size(BN_num_bits(w));\n    for (i = 0; i < iterations; ++i) {\n        if (!BN_priv_rand_range(b, w3) || !BN_add_word(b, 2))\n            goto err;\n        if (enhanced) {\n            if (!BN_gcd(g, b, w, ctx))\n                goto err;\n            if (!BN_is_one(g)) {\n                *status = BN_PRIMETEST_COMPOSITE_WITH_FACTOR;\n                ret = 1;\n                goto err;\n            }\n        }\n        if (!BN_mod_exp_mont(z, b, m, w, ctx, mont))\n            goto err;\n        if (BN_is_one(z) || BN_cmp(z, w1) == 0)\n            goto outer_loop;\n        for (j = 1; j < a ; ++j) {\n            if (!BN_copy(x, z) || !BN_mod_mul(z, x, x, w, ctx))\n                goto err;\n            if (BN_cmp(z, w1) == 0)\n                goto outer_loop;\n            if (BN_is_one(z))\n                goto composite;\n        }\n        if (!BN_copy(x, z) || !BN_mod_mul(z, x, x, w, ctx))\n            goto err;\n        if (BN_is_one(z))\n            goto composite;\n        if (!BN_copy(x, z))\n            goto err;\ncomposite:\n        if (enhanced) {\n            if (!BN_sub_word(x, 1) || !BN_gcd(g, x, w, ctx))\n                goto err;\n            if (BN_is_one(g))\n                *status = BN_PRIMETEST_COMPOSITE_NOT_POWER_OF_PRIME;\n            else\n                *status = BN_PRIMETEST_COMPOSITE_WITH_FACTOR;\n        } else {\n            *status = BN_PRIMETEST_COMPOSITE;\n        }\n        ret = 1;\n        goto err;\nouter_loop: ;\n        if (!BN_GENCB_call(cb, 1, i))\n            goto err;\n    }\n    *status = BN_PRIMETEST_PROBABLY_PRIME;\n    ret = 1;\nerr:\n    BN_clear(g);\n    BN_clear(w1);\n    BN_clear(w3);\n    BN_clear(x);\n    BN_clear(m);\n    BN_clear(z);\n    BN_clear(b);\n    BN_CTX_end(ctx);\n    BN_MONT_CTX_free(mont);\n    return ret;\n}', 'int BN_mod_exp_mont(BIGNUM *rr, const BIGNUM *a, const BIGNUM *p,\n                    const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *in_mont)\n{\n    int i, j, bits, ret = 0, wstart, wend, window, wvalue;\n    int start = 1;\n    BIGNUM *d, *r;\n    const BIGNUM *aa;\n    BIGNUM *val[TABLE_SIZE];\n    BN_MONT_CTX *mont = NULL;\n    if (BN_get_flags(p, BN_FLG_CONSTTIME) != 0\n            || BN_get_flags(a, BN_FLG_CONSTTIME) != 0\n            || BN_get_flags(m, BN_FLG_CONSTTIME) != 0) {\n        return BN_mod_exp_mont_consttime(rr, a, p, m, ctx, in_mont);\n    }\n    bn_check_top(a);\n    bn_check_top(p);\n    bn_check_top(m);\n    if (!BN_is_odd(m)) {\n        BNerr(BN_F_BN_MOD_EXP_MONT, BN_R_CALLED_WITH_EVEN_MODULUS);\n        return 0;\n    }\n    bits = BN_num_bits(p);\n    if (bits == 0) {\n        if (BN_abs_is_word(m, 1)) {\n            ret = 1;\n            BN_zero(rr);\n        } else {\n            ret = BN_one(rr);\n        }\n        return ret;\n    }\n    BN_CTX_start(ctx);\n    d = BN_CTX_get(ctx);\n    r = BN_CTX_get(ctx);\n    val[0] = BN_CTX_get(ctx);\n    if (val[0] == NULL)\n        goto err;\n    if (in_mont != NULL)\n        mont = in_mont;\n    else {\n        if ((mont = BN_MONT_CTX_new()) == NULL)\n            goto err;\n        if (!BN_MONT_CTX_set(mont, m, ctx))\n            goto err;\n    }\n    if (a->neg || BN_ucmp(a, m) >= 0) {\n        if (!BN_nnmod(val[0], a, m, ctx))\n            goto err;\n        aa = val[0];\n    } else\n        aa = a;\n    if (!bn_to_mont_fixed_top(val[0], aa, mont, ctx))\n        goto err;\n    window = BN_window_bits_for_exponent_size(bits);\n    if (window > 1) {\n        if (!bn_mul_mont_fixed_top(d, val[0], val[0], mont, ctx))\n            goto err;\n        j = 1 << (window - 1);\n        for (i = 1; i < j; i++) {\n            if (((val[i] = BN_CTX_get(ctx)) == NULL) ||\n                !bn_mul_mont_fixed_top(val[i], val[i - 1], d, mont, ctx))\n                goto err;\n        }\n    }\n    start = 1;\n    wvalue = 0;\n    wstart = bits - 1;\n    wend = 0;\n#if 1\n    j = m->top;\n    if (m->d[j - 1] & (((BN_ULONG)1) << (BN_BITS2 - 1))) {\n        if (bn_wexpand(r, j) == NULL)\n            goto err;\n        r->d[0] = (0 - m->d[0]) & BN_MASK2;\n        for (i = 1; i < j; i++)\n            r->d[i] = (~m->d[i]) & BN_MASK2;\n        r->top = j;\n        r->flags |= BN_FLG_FIXED_TOP;\n    } else\n#endif\n    if (!bn_to_mont_fixed_top(r, BN_value_one(), mont, ctx))\n        goto err;\n    for (;;) {\n        if (BN_is_bit_set(p, wstart) == 0) {\n            if (!start) {\n                if (!bn_mul_mont_fixed_top(r, r, r, mont, ctx))\n                    goto err;\n            }\n            if (wstart == 0)\n                break;\n            wstart--;\n            continue;\n        }\n        j = wstart;\n        wvalue = 1;\n        wend = 0;\n        for (i = 1; i < window; i++) {\n            if (wstart - i < 0)\n                break;\n            if (BN_is_bit_set(p, wstart - i)) {\n                wvalue <<= (i - wend);\n                wvalue |= 1;\n                wend = i;\n            }\n        }\n        j = wend + 1;\n        if (!start)\n            for (i = 0; i < j; i++) {\n                if (!bn_mul_mont_fixed_top(r, r, r, mont, ctx))\n                    goto err;\n            }\n        if (!bn_mul_mont_fixed_top(r, r, val[wvalue >> 1], mont, ctx))\n            goto err;\n        wstart -= wend + 1;\n        wvalue = 0;\n        start = 0;\n        if (wstart < 0)\n            break;\n    }\n#if defined(SPARC_T4_MONT)\n    if (OPENSSL_sparcv9cap_P[0] & (SPARCV9_VIS3 | SPARCV9_PREFER_FPU)) {\n        j = mont->N.top;\n        val[0]->d[0] = 1;\n        for (i = 1; i < j; i++)\n            val[0]->d[i] = 0;\n        val[0]->top = j;\n        if (!BN_mod_mul_montgomery(rr, r, val[0], mont, ctx))\n            goto err;\n    } else\n#endif\n    if (!BN_from_montgomery(rr, r, mont, ctx))\n        goto err;\n    ret = 1;\n err:\n    if (in_mont == NULL)\n        BN_MONT_CTX_free(mont);\n    BN_CTX_end(ctx);\n    bn_check_top(rr);\n    return ret;\n}', 'int BN_nnmod(BIGNUM *r, const BIGNUM *m, const BIGNUM *d, BN_CTX *ctx)\n{\n    if (!(BN_mod(r, m, d, ctx)))\n        return 0;\n    if (!r->neg)\n        return 1;\n    return (d->neg ? BN_sub : BN_add) (r, r, d);\n}', 'int BN_div(BIGNUM *dv, BIGNUM *rm, const BIGNUM *num, const BIGNUM *divisor,\n           BN_CTX *ctx)\n{\n    int ret;\n    if (BN_is_zero(divisor)) {\n        BNerr(BN_F_BN_DIV, BN_R_DIV_BY_ZERO);\n        return 0;\n    }\n    if (divisor->d[divisor->top - 1] == 0) {\n        BNerr(BN_F_BN_DIV, BN_R_NOT_INITIALIZED);\n        return 0;\n    }\n    ret = bn_div_fixed_top(dv, rm, num, divisor, ctx);\n    if (ret) {\n        if (dv != NULL)\n            bn_correct_top(dv);\n        if (rm != NULL)\n            bn_correct_top(rm);\n    }\n    return ret;\n}', 'int BN_rshift1(BIGNUM *r, const BIGNUM *a)\n{\n    BN_ULONG *ap, *rp, t, c;\n    int i, j;\n    bn_check_top(r);\n    bn_check_top(a);\n    if (BN_is_zero(a)) {\n        BN_zero(r);\n        return 1;\n    }\n    i = a->top;\n    ap = a->d;\n    j = i - (ap[i - 1] == 1);\n    if (a != r) {\n        if (bn_wexpand(r, j) == NULL)\n            return 0;\n        r->neg = a->neg;\n    }\n    rp = r->d;\n    t = ap[--i];\n    c = (t & 1) ? BN_TBIT : 0;\n    if (t >>= 1)\n        rp[i] = t;\n    while (i > 0) {\n        t = ap[--i];\n        rp[i] = ((t >> 1) & BN_MASK2) | c;\n        c = (t & 1) ? BN_TBIT : 0;\n    }\n    r->top = j;\n    if (!r->top)\n        r->neg = 0;\n    bn_check_top(r);\n    return 1;\n}']