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 ec_GFp_simple_dbl(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a,\n                      BN_CTX *ctx)\n{\n    int (*field_mul) (const EC_GROUP *, BIGNUM *, const BIGNUM *,\n                      const BIGNUM *, BN_CTX *);\n    int (*field_sqr) (const EC_GROUP *, BIGNUM *, const BIGNUM *, BN_CTX *);\n    const BIGNUM *p;\n    BN_CTX *new_ctx = NULL;\n    BIGNUM *n0, *n1, *n2, *n3;\n    int ret = 0;\n    if (EC_POINT_is_at_infinity(group, a)) {\n        BN_zero(r->Z);\n        r->Z_is_one = 0;\n        return 1;\n    }\n    field_mul = group->meth->field_mul;\n    field_sqr = group->meth->field_sqr;\n    p = group->field;\n    if (ctx == NULL) {\n        ctx = new_ctx = BN_CTX_new();\n        if (ctx == NULL)\n            return 0;\n    }\n    BN_CTX_start(ctx);\n    n0 = BN_CTX_get(ctx);\n    n1 = BN_CTX_get(ctx);\n    n2 = BN_CTX_get(ctx);\n    n3 = BN_CTX_get(ctx);\n    if (n3 == NULL)\n        goto err;\n    if (a->Z_is_one) {\n        if (!field_sqr(group, n0, a->X, ctx))\n            goto err;\n        if (!BN_mod_lshift1_quick(n1, n0, p))\n            goto err;\n        if (!BN_mod_add_quick(n0, n0, n1, p))\n            goto err;\n        if (!BN_mod_add_quick(n1, n0, group->a, p))\n            goto err;\n    } else if (group->a_is_minus3) {\n        if (!field_sqr(group, n1, a->Z, ctx))\n            goto err;\n        if (!BN_mod_add_quick(n0, a->X, n1, p))\n            goto err;\n        if (!BN_mod_sub_quick(n2, a->X, n1, p))\n            goto err;\n        if (!field_mul(group, n1, n0, n2, ctx))\n            goto err;\n        if (!BN_mod_lshift1_quick(n0, n1, p))\n            goto err;\n        if (!BN_mod_add_quick(n1, n0, n1, p))\n            goto err;\n    } else {\n        if (!field_sqr(group, n0, a->X, ctx))\n            goto err;\n        if (!BN_mod_lshift1_quick(n1, n0, p))\n            goto err;\n        if (!BN_mod_add_quick(n0, n0, n1, p))\n            goto err;\n        if (!field_sqr(group, n1, a->Z, ctx))\n            goto err;\n        if (!field_sqr(group, n1, n1, ctx))\n            goto err;\n        if (!field_mul(group, n1, n1, group->a, ctx))\n            goto err;\n        if (!BN_mod_add_quick(n1, n1, n0, p))\n            goto err;\n    }\n    if (a->Z_is_one) {\n        if (!BN_copy(n0, a->Y))\n            goto err;\n    } else {\n        if (!field_mul(group, n0, a->Y, a->Z, ctx))\n            goto err;\n    }\n    if (!BN_mod_lshift1_quick(r->Z, n0, p))\n        goto err;\n    r->Z_is_one = 0;\n    if (!field_sqr(group, n3, a->Y, ctx))\n        goto err;\n    if (!field_mul(group, n2, a->X, n3, ctx))\n        goto err;\n    if (!BN_mod_lshift_quick(n2, n2, 2, p))\n        goto err;\n    if (!BN_mod_lshift1_quick(n0, n2, p))\n        goto err;\n    if (!field_sqr(group, r->X, n1, ctx))\n        goto err;\n    if (!BN_mod_sub_quick(r->X, r->X, n0, p))\n        goto err;\n    if (!field_sqr(group, n0, n3, ctx))\n        goto err;\n    if (!BN_mod_lshift_quick(n3, n0, 3, p))\n        goto err;\n    if (!BN_mod_sub_quick(n0, n2, r->X, p))\n        goto err;\n    if (!field_mul(group, n0, n1, n0, ctx))\n        goto err;\n    if (!BN_mod_sub_quick(r->Y, n0, n3, p))\n        goto err;\n    ret = 1;\n err:\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}', 'BIGNUM *BN_copy(BIGNUM *a, const BIGNUM *b)\n{\n    bn_check_top(b);\n    if (a == b)\n        return a;\n    if (bn_wexpand(a, b->top) == NULL)\n        return NULL;\n    if (b->top > 0)\n        memcpy(a->d, b->d, sizeof(b->d[0]) * b->top);\n    a->neg = b->neg;\n    a->top = b->top;\n    a->flags |= b->flags & BN_FLG_FIXED_TOP;\n    bn_check_top(a);\n    return a;\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}']