static BN_ULONG *bn_expand_internal(const BIGNUM *b, int words)
{
    BN_ULONG *a = NULL;
    if (words > (INT_MAX / (4 * BN_BITS2))) {
        BNerr(BN_F_BN_EXPAND_INTERNAL, BN_R_BIGNUM_TOO_LONG);
        return NULL;
    }
    if (BN_get_flags(b, BN_FLG_STATIC_DATA)) {
        BNerr(BN_F_BN_EXPAND_INTERNAL, BN_R_EXPAND_ON_STATIC_BIGNUM_DATA);
        return NULL;
    }
    if (BN_get_flags(b, BN_FLG_SECURE))
        a = OPENSSL_secure_zalloc(words * sizeof(*a));
    else
        a = OPENSSL_zalloc(words * sizeof(*a));
    if (a == NULL) {
        BNerr(BN_F_BN_EXPAND_INTERNAL, ERR_R_MALLOC_FAILURE);
        return NULL;
    }
    assert(b->top <= words);
    if (b->top > 0)
        memcpy(a, b->d, sizeof(*a) * b->top);
    return a;
}
['int BN_BLINDING_invert_ex(BIGNUM *n, const BIGNUM *r, BN_BLINDING *b,\n                          BN_CTX *ctx)\n{\n    int ret;\n    bn_check_top(n);\n    if (r == NULL && (r = b->Ai) == NULL) {\n        BNerr(BN_F_BN_BLINDING_INVERT_EX, BN_R_NOT_INITIALIZED);\n        return 0;\n    }\n    if (b->m_ctx != NULL) {\n        if (n->dmax >= r->top) {\n            size_t i, rtop = r->top, ntop = n->top;\n            BN_ULONG mask;\n            for (i = 0; i < rtop; i++) {\n                mask = (BN_ULONG)0 - ((i - ntop) >> (8 * sizeof(i) - 1));\n                n->d[i] &= mask;\n            }\n            mask = (BN_ULONG)0 - ((rtop - ntop) >> (8 * sizeof(ntop) - 1));\n            n->top = (int)(rtop & ~mask) | (ntop & mask);\n            n->flags |= (BN_FLG_FIXED_TOP & ~mask);\n        }\n        ret = BN_mod_mul_montgomery(n, n, r, b->m_ctx, ctx);\n    } else {\n        ret = BN_mod_mul(n, n, r, b->mod, ctx);\n    }\n    bn_check_top(n);\n    return ret;\n}', 'int BN_mod_mul_montgomery(BIGNUM *r, const BIGNUM *a, const BIGNUM *b,\n                          BN_MONT_CTX *mont, BN_CTX *ctx)\n{\n    int ret = bn_mul_mont_fixed_top(r, a, b, mont, ctx);\n    bn_correct_top(r);\n    bn_check_top(r);\n    return ret;\n}', 'int bn_mul_mont_fixed_top(BIGNUM *r, const BIGNUM *a, const BIGNUM *b,\n                          BN_MONT_CTX *mont, BN_CTX *ctx)\n{\n    BIGNUM *tmp;\n    int ret = 0;\n    int num = mont->N.top;\n#if defined(OPENSSL_BN_ASM_MONT) && defined(MONT_WORD)\n    if (num > 1 && a->top == num && b->top == num) {\n        if (bn_wexpand(r, num) == NULL)\n            return 0;\n        if (bn_mul_mont(r->d, a->d, b->d, mont->N.d, mont->n0, num)) {\n            r->neg = a->neg ^ b->neg;\n            r->top = num;\n            r->flags |= BN_FLG_FIXED_TOP;\n            return 1;\n        }\n    }\n#endif\n    if ((a->top + b->top) > 2 * num)\n        return 0;\n    BN_CTX_start(ctx);\n    tmp = BN_CTX_get(ctx);\n    if (tmp == NULL)\n        goto err;\n    bn_check_top(tmp);\n    if (a == b) {\n        if (!bn_sqr_fixed_top(tmp, a, ctx))\n            goto err;\n    } else {\n        if (!bn_mul_fixed_top(tmp, a, b, ctx))\n            goto err;\n    }\n#ifdef MONT_WORD\n    if (!bn_from_montgomery_word(r, tmp, mont))\n        goto err;\n#else\n    if (!BN_from_montgomery(r, tmp, mont, ctx))\n        goto err;\n#endif\n    ret = 1;\n err:\n    BN_CTX_end(ctx);\n    return ret;\n}', 'static int bn_from_montgomery_word(BIGNUM *ret, BIGNUM *r, BN_MONT_CTX *mont)\n{\n    BIGNUM *n;\n    BN_ULONG *ap, *np, *rp, n0, v, carry;\n    int nl, max, i;\n    unsigned int rtop;\n    n = &(mont->N);\n    nl = n->top;\n    if (nl == 0) {\n        ret->top = 0;\n        return 1;\n    }\n    max = (2 * nl);\n    if (bn_wexpand(r, max) == NULL)\n        return 0;\n    r->neg ^= n->neg;\n    np = n->d;\n    rp = r->d;\n    for (rtop = r->top, i = 0; i < max; i++) {\n        v = (BN_ULONG)0 - ((i - rtop) >> (8 * sizeof(rtop) - 1));\n        rp[i] &= v;\n    }\n    r->top = max;\n    r->flags |= BN_FLG_FIXED_TOP;\n    n0 = mont->n0[0];\n    for (carry = 0, i = 0; i < nl; i++, rp++) {\n        v = bn_mul_add_words(rp, np, nl, (rp[0] * n0) & BN_MASK2);\n        v = (v + carry + rp[nl]) & BN_MASK2;\n        carry |= (v != rp[nl]);\n        carry &= (v <= rp[nl]);\n        rp[nl] = v;\n    }\n    if (bn_wexpand(ret, nl) == NULL)\n        return 0;\n    ret->top = nl;\n    ret->flags |= BN_FLG_FIXED_TOP;\n    ret->neg = r->neg;\n    rp = ret->d;\n    ap = &(r->d[nl]);\n    carry -= bn_sub_words(rp, ap, np, nl);\n    for (i = 0; i < nl; i++) {\n        rp[i] = (carry & ap[i]) | (~carry & rp[i]);\n        ap[i] = 0;\n    }\n    return 1;\n}', 'BIGNUM *bn_wexpand(BIGNUM *a, int words)\n{\n    return (words <= a->dmax) ? a : bn_expand2(a, words);\n}', 'BIGNUM *bn_expand2(BIGNUM *b, int words)\n{\n    if (words > b->dmax) {\n        BN_ULONG *a = bn_expand_internal(b, words);\n        if (!a)\n            return NULL;\n        if (b->d) {\n            OPENSSL_cleanse(b->d, b->dmax * sizeof(b->d[0]));\n            bn_free_d(b);\n        }\n        b->d = a;\n        b->dmax = words;\n    }\n    return b;\n}', 'static BN_ULONG *bn_expand_internal(const BIGNUM *b, int words)\n{\n    BN_ULONG *a = NULL;\n    if (words > (INT_MAX / (4 * BN_BITS2))) {\n        BNerr(BN_F_BN_EXPAND_INTERNAL, BN_R_BIGNUM_TOO_LONG);\n        return NULL;\n    }\n    if (BN_get_flags(b, BN_FLG_STATIC_DATA)) {\n        BNerr(BN_F_BN_EXPAND_INTERNAL, BN_R_EXPAND_ON_STATIC_BIGNUM_DATA);\n        return NULL;\n    }\n    if (BN_get_flags(b, BN_FLG_SECURE))\n        a = OPENSSL_secure_zalloc(words * sizeof(*a));\n    else\n        a = OPENSSL_zalloc(words * sizeof(*a));\n    if (a == NULL) {\n        BNerr(BN_F_BN_EXPAND_INTERNAL, ERR_R_MALLOC_FAILURE);\n        return NULL;\n    }\n    assert(b->top <= words);\n    if (b->top > 0)\n        memcpy(a, b->d, sizeof(*a) * b->top);\n    return a;\n}', 'void *CRYPTO_zalloc(size_t num, const char *file, int line)\n{\n    void *ret = CRYPTO_malloc(num, file, line);\n    FAILTEST();\n    if (ret != NULL)\n        memset(ret, 0, num);\n    return ret;\n}', 'void *CRYPTO_malloc(size_t num, const char *file, int line)\n{\n    void *ret = NULL;\n    INCREMENT(malloc_count);\n    if (malloc_impl != NULL && malloc_impl != CRYPTO_malloc)\n        return malloc_impl(num, file, line);\n    if (num == 0)\n        return NULL;\n    FAILTEST();\n    if (allow_customize) {\n        allow_customize = 0;\n    }\n#ifndef OPENSSL_NO_CRYPTO_MDEBUG\n    if (call_malloc_debug) {\n        CRYPTO_mem_debug_malloc(NULL, num, 0, file, line);\n        ret = malloc(num);\n        CRYPTO_mem_debug_malloc(ret, num, 1, file, line);\n    } else {\n        ret = malloc(num);\n    }\n#else\n    (void)(file); (void)(line);\n    ret = malloc(num);\n#endif\n    return ret;\n}']