Botan 2.19.3
Crypto and TLS for C&
safeint.h
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1/*
2* Safe(r) Integer Handling
3* (C) 2016 Jack Lloyd
4*
5* Botan is released under the Simplified BSD License (see license.txt)
6*/
7
8#ifndef BOTAN_UTILS_SAFE_INT_H_
9#define BOTAN_UTILS_SAFE_INT_H_
10
11#include <botan/exceptn.h>
12#include <string>
13
14namespace Botan {
15
17 {
18 public:
19 Integer_Overflow_Detected(const std::string& file, int line) :
20 Exception("Integer overflow detected at " + file + ":" + std::to_string(line))
21 {}
22
23 ErrorType error_type() const noexcept override { return ErrorType::InternalError; }
24 };
25
26inline size_t checked_add(size_t x, size_t y, const char* file, int line)
27 {
28 // TODO: use __builtin_x_overflow on GCC and Clang
29 size_t z = x + y;
30 if(z < x)
31 {
32 throw Integer_Overflow_Detected(file, line);
33 }
34 return z;
35 }
36
37#define BOTAN_CHECKED_ADD(x,y) checked_add(x,y,__FILE__,__LINE__)
38
39}
40
41#endif
Integer_Overflow_Detected(const std::string &file, int line)
Definition safeint.h:19
ErrorType error_type() const noexcept override
Definition safeint.h:23
int(* final)(unsigned char *, CTX *)
#define BOTAN_PUBLIC_API(maj, min)
Definition compiler.h:31
ErrorType
Definition exceptn.h:20
size_t checked_add(size_t x, size_t y, const char *file, int line)
Definition safeint.h:26
Definition bigint.h:1143