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
16 extern "C" {
17
18 using namespace Botan_FFI;
19
20 #if defined(BOTAN_HAS_FPE_FE1)
21
22 BOTAN_FFI_DECLARE_STRUCT(botan_fpe_struct, Botan::FPE_FE1, 0xD49FB820);
23
24 #endif
25
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)26 int botan_fpe_fe1_init(botan_fpe_t* fpe, botan_mp_t n,
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)
35 return BOTAN_FFI_ERROR_NULL_POINTER;
36
37 *fpe = nullptr;
38
39 if(flags != 0 && flags != BOTAN_FPE_FLAG_FE1_COMPAT_MODE)
40 return BOTAN_FFI_ERROR_BAD_FLAG;
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(fpe_obj.release());
50 return BOTAN_FFI_SUCCESS;
51 });
52 #else
53 *fpe = nullptr;
54 return BOTAN_FFI_ERROR_NOT_IMPLEMENTED;
55 #endif
56 }
57
botan_fpe_destroy(botan_fpe_t fpe)58 int botan_fpe_destroy(botan_fpe_t fpe)
59 {
60 #if defined(BOTAN_HAS_FPE_FE1)
61 return BOTAN_FFI_CHECKED_DELETE(fpe);
62 #else
63 return BOTAN_FFI_ERROR_NOT_IMPLEMENTED;
64 #endif
65 }
66
botan_fpe_encrypt(botan_fpe_t fpe,botan_mp_t x,const uint8_t tweak[],size_t tweak_len)67 int 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
76 return BOTAN_FFI_ERROR_NOT_IMPLEMENTED;
77 #endif
78 }
79
botan_fpe_decrypt(botan_fpe_t fpe,botan_mp_t x,const uint8_t tweak[],size_t tweak_len)80 int 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
90 return BOTAN_FFI_ERROR_NOT_IMPLEMENTED;
91 #endif
92 }
93
94 }
95