Botan 3.3.0
Crypto and TLS for C&
Functions
ffi_mac.cpp File Reference
#include <botan/ffi.h>
#include <botan/mac.h>
#include <botan/internal/ffi_util.h>

Go to the source code of this file.

Functions

 BOTAN_FFI_DECLARE_STRUCT (botan_mac_struct, Botan::MessageAuthenticationCode, 0xA06E8FC1)
 
int botan_mac_clear (botan_mac_t mac)
 
int botan_mac_destroy (botan_mac_t mac)
 
int botan_mac_final (botan_mac_t mac, uint8_t out[])
 
int botan_mac_get_keyspec (botan_mac_t mac, size_t *out_minimum_keylength, size_t *out_maximum_keylength, size_t *out_keylength_modulo)
 
int botan_mac_init (botan_mac_t *mac, const char *mac_name, uint32_t flags)
 
int botan_mac_name (botan_mac_t mac, char *name, size_t *name_len)
 
int botan_mac_output_length (botan_mac_t mac, size_t *out)
 
int botan_mac_set_key (botan_mac_t mac, const uint8_t *key, size_t key_len)
 
int botan_mac_set_nonce (botan_mac_t mac, const uint8_t *nonce, size_t nonce_len)
 
int botan_mac_update (botan_mac_t mac, const uint8_t *buf, size_t len)
 

Function Documentation

◆ BOTAN_FFI_DECLARE_STRUCT()

BOTAN_FFI_DECLARE_STRUCT ( botan_mac_struct ,
Botan::MessageAuthenticationCode ,
0xA06E8FC1  )

◆ botan_mac_clear()

int botan_mac_clear ( botan_mac_t mac)

Reinitializes the state of the MAC computation. A MAC can be computed (with update/final) immediately.

Parameters
macmac object
Returns
0 on success, a negative value on failure

Definition at line 51 of file ffi_mac.cpp.

51 {
52 return BOTAN_FFI_VISIT(mac, [](auto& m) { m.clear(); });
53}
#define BOTAN_FFI_VISIT(obj, lambda)
Definition ffi_util.h:124

References BOTAN_FFI_VISIT.

◆ botan_mac_destroy()

int botan_mac_destroy ( botan_mac_t mac)

Frees all resources of the MAC object

Parameters
macmac object
Returns
0 if success, error if invalid object handle

Definition at line 35 of file ffi_mac.cpp.

35 {
36 return BOTAN_FFI_CHECKED_DELETE(mac);
37}
#define BOTAN_FFI_CHECKED_DELETE(o)
Definition ffi_util.h:143

References BOTAN_FFI_CHECKED_DELETE.

◆ botan_mac_final()

int botan_mac_final ( botan_mac_t mac,
uint8_t out[] )

Finalizes the MAC computation and writes the output to out[0:botan_mac_output_length()] then reinitializes for computing another MAC as if botan_mac_clear had been called.

Parameters
macmac object
outoutput buffer
Returns
0 on success, a negative value on failure

Definition at line 59 of file ffi_mac.cpp.

59 {
60 return BOTAN_FFI_VISIT(mac, [=](auto& m) { m.final(out); });
61}

References BOTAN_FFI_VISIT.

◆ botan_mac_get_keyspec()

int botan_mac_get_keyspec ( botan_mac_t mac,
size_t * out_minimum_keylength,
size_t * out_maximum_keylength,
size_t * out_keylength_modulo )

Get the key length limits of this auth code

Parameters
macthe object to read
out_minimum_keylengthif non-NULL, will be set to minimum keylength of MAC
out_maximum_keylengthif non-NULL, will be set to maximum keylength of MAC
out_keylength_moduloif non-NULL will be set to byte multiple of valid keys

Definition at line 67 of file ffi_mac.cpp.

70 {
71 return BOTAN_FFI_VISIT(mac, [=](auto& m) {
72 if(out_minimum_keylength)
73 *out_minimum_keylength = m.minimum_keylength();
74 if(out_maximum_keylength)
75 *out_maximum_keylength = m.maximum_keylength();
76 if(out_keylength_modulo)
77 *out_keylength_modulo = m.key_spec().keylength_multiple();
78 });
79}

References BOTAN_FFI_VISIT.

◆ botan_mac_init()

int botan_mac_init ( botan_mac_t * mac,
const char * mac_name,
uint32_t flags )

Initialize a message authentication code object

Parameters
macmac object
mac_namename of the hash function, e.g., "HMAC(SHA-384)"
flagsshould be 0 in current API revision, all other uses are reserved and return a negative value (error code)
Returns
0 on success, a negative value on failure

Definition at line 18 of file ffi_mac.cpp.

18 {
19 return ffi_guard_thunk(__func__, [=]() -> int {
20 if(!mac || !mac_name || flags != 0) {
22 }
23
24 std::unique_ptr<Botan::MessageAuthenticationCode> m = Botan::MessageAuthenticationCode::create(mac_name);
25
26 if(m == nullptr) {
28 }
29
30 *mac = new botan_mac_struct(std::move(m));
31 return BOTAN_FFI_SUCCESS;
32 });
33}
static std::unique_ptr< MessageAuthenticationCode > create(std::string_view algo_spec, std::string_view provider="")
Definition mac.cpp:51
@ BOTAN_FFI_ERROR_NOT_IMPLEMENTED
Definition ffi.h:110
@ BOTAN_FFI_ERROR_NULL_POINTER
Definition ffi.h:104
@ BOTAN_FFI_SUCCESS
Definition ffi.h:89
int ffi_guard_thunk(const char *func_name, const std::function< int()> &thunk)
Definition ffi.cpp:116

References BOTAN_FFI_ERROR_NOT_IMPLEMENTED, BOTAN_FFI_ERROR_NULL_POINTER, BOTAN_FFI_SUCCESS, Botan::MessageAuthenticationCode::create(), and Botan_FFI::ffi_guard_thunk().

◆ botan_mac_name()

int botan_mac_name ( botan_mac_t mac,
char * name,
size_t * name_len )

Get the name of this MAC

Parameters
macthe object to read
nameoutput buffer
name_lenon input, the length of buffer, on success the number of bytes written

Definition at line 63 of file ffi_mac.cpp.

63 {
64 return BOTAN_FFI_VISIT(mac, [=](const auto& m) { return write_str_output(name, name_len, m.name()); });
65}
std::string name
int write_str_output(uint8_t out[], size_t *out_len, std::string_view str)
Definition ffi_util.h:205

References BOTAN_FFI_VISIT, name, and Botan_FFI::write_str_output().

◆ botan_mac_output_length()

int botan_mac_output_length ( botan_mac_t mac,
size_t * output_length )

Writes the output length of the message authentication code to *output_length

Parameters
macmac object
output_lengthoutput buffer to hold the MAC output length
Returns
0 on success, a negative value on failure

Definition at line 47 of file ffi_mac.cpp.

47 {
48 return BOTAN_FFI_VISIT(mac, [=](const auto& m) { *out = m.output_length(); });
49}

References BOTAN_FFI_VISIT.

◆ botan_mac_set_key()

int botan_mac_set_key ( botan_mac_t mac,
const uint8_t * key,
size_t key_len )

Sets the key on the MAC

Parameters
macmac object
keybuffer holding the key
key_lensize of the key buffer in bytes
Returns
0 on success, a negative value on failure

Definition at line 39 of file ffi_mac.cpp.

39 {
40 return BOTAN_FFI_VISIT(mac, [=](auto& m) { m.set_key(key, key_len); });
41}

References BOTAN_FFI_VISIT.

◆ botan_mac_set_nonce()

int botan_mac_set_nonce ( botan_mac_t mac,
const uint8_t * nonce,
size_t nonce_len )

Sets the nonce on the MAC

Parameters
macmac object
noncebuffer holding the key
nonce_lensize of the key buffer in bytes
Returns
0 on success, a negative value on failure

Definition at line 43 of file ffi_mac.cpp.

43 {
44 return BOTAN_FFI_VISIT(mac, [=](auto& m) { m.start(nonce, nonce_len); });
45}

References BOTAN_FFI_VISIT.

◆ botan_mac_update()

int botan_mac_update ( botan_mac_t mac,
const uint8_t * buf,
size_t len )

Send more input to the message authentication code

Parameters
macmac object
bufinput buffer
lennumber of bytes to read from the input buffer
Returns
0 on success, a negative value on failure

Definition at line 55 of file ffi_mac.cpp.

55 {
56 return BOTAN_FFI_VISIT(mac, [=](auto& m) { m.update(buf, len); });
57}

References BOTAN_FFI_VISIT.