Botan 3.0.0-alpha0
Crypto and TLS for C&
ffi_fpe.cpp
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1/*
2* (C) 2018 Jack Lloyd
3*
4* Botan is released under the Simplified BSD License (see license.txt)
5*/
6
7#include <botan/ffi.h>
8#include <botan/internal/ffi_util.h>
9#include <botan/internal/ffi_mp.h>
10#include <memory>
11
12#if defined(BOTAN_HAS_FPE_FE1)
13 #include <botan/fpe_fe1.h>
14#endif
15
16extern "C" {
17
18using namespace Botan_FFI;
19
20#if defined(BOTAN_HAS_FPE_FE1)
21
22BOTAN_FFI_DECLARE_STRUCT(botan_fpe_struct, Botan::FPE_FE1, 0xD49FB820);
23
24#endif
25
27 const uint8_t key[], size_t key_len,
28 size_t rounds, uint32_t flags)
29 {
30#if defined(BOTAN_HAS_FPE_FE1)
31
32 return ffi_guard_thunk(__func__, [=]() {
33
34 if(fpe == nullptr || key == nullptr)
36
37 *fpe = nullptr;
38
41
42 const bool compat_mode = (flags & BOTAN_FPE_FLAG_FE1_COMPAT_MODE);
43
44 std::unique_ptr<Botan::FPE_FE1> fpe_obj(
45 new Botan::FPE_FE1(safe_get(n), rounds, compat_mode));
46
47 fpe_obj->set_key(key, key_len);
48
49 *fpe = new botan_fpe_struct(std::move(fpe_obj));
50 return BOTAN_FFI_SUCCESS;
51 });
52#else
53 *fpe = nullptr;
55#endif
56 }
57
59 {
60#if defined(BOTAN_HAS_FPE_FE1)
61 return BOTAN_FFI_CHECKED_DELETE(fpe);
62#else
64#endif
65 }
66
67int botan_fpe_encrypt(botan_fpe_t fpe, botan_mp_t x, const uint8_t tweak[], size_t tweak_len)
68 {
69#if defined(BOTAN_HAS_FPE_FE1)
70 return ffi_guard_thunk(__func__, [=]() {
71 Botan::BigInt r = safe_get(fpe).encrypt(safe_get(x), tweak, tweak_len);
72 safe_get(x) = r;
73 return BOTAN_FFI_SUCCESS;
74 });
75#else
77#endif
78 }
79
80int botan_fpe_decrypt(botan_fpe_t fpe, botan_mp_t x, const uint8_t tweak[], size_t tweak_len)
81 {
82#if defined(BOTAN_HAS_FPE_FE1)
83 return ffi_guard_thunk(__func__, [=]() {
84 Botan::BigInt r = safe_get(fpe).decrypt(safe_get(x), tweak, tweak_len);
85 safe_get(x) = r;
86 return BOTAN_FFI_SUCCESS;
87 });
88
89#else
91#endif
92 }
93
94}
struct botan_mp_struct * botan_mp_t
Definition: ffi.h:775
#define BOTAN_FPE_FLAG_FE1_COMPAT_MODE
Definition: ffi.h:1766
@ BOTAN_FFI_ERROR_NOT_IMPLEMENTED
Definition: ffi.h:83
@ BOTAN_FFI_ERROR_BAD_FLAG
Definition: ffi.h:76
@ BOTAN_FFI_ERROR_NULL_POINTER
Definition: ffi.h:77
@ BOTAN_FFI_SUCCESS
Definition: ffi.h:63
struct botan_fpe_struct * botan_fpe_t
Definition: ffi.h:1764
int botan_fpe_decrypt(botan_fpe_t fpe, botan_mp_t x, const uint8_t tweak[], size_t tweak_len)
Definition: ffi_fpe.cpp:80
int botan_fpe_destroy(botan_fpe_t fpe)
Definition: ffi_fpe.cpp:58
int botan_fpe_encrypt(botan_fpe_t fpe, botan_mp_t x, const uint8_t tweak[], size_t tweak_len)
Definition: ffi_fpe.cpp:67
int botan_fpe_fe1_init(botan_fpe_t *fpe, botan_mp_t n, const uint8_t key[], size_t key_len, size_t rounds, uint32_t flags)
Definition: ffi_fpe.cpp:26
#define BOTAN_FFI_CHECKED_DELETE(o)
Definition: ffi_util.h:126
#define BOTAN_FFI_DECLARE_STRUCT(NAME, TYPE, MAGIC)
Definition: ffi_util.h:55
Flags flags(Flag flags)
Definition: p11.h:860
T & safe_get(botan_struct< T, M > *p)
Definition: ffi_util.h:65
int ffi_guard_thunk(const char *func_name, const std::function< int()> &thunk)
Definition: ffi.cpp:92