ffi_zfec.cpp File Reference

#include <botan/ffi.h>
#include <botan/internal/ffi_util.h>

Go to the source code of this file.

Functions
int	botan_zfec_decode (size_t K, size_t N, const size_t *indexes, uint8_t *const *const inputs, size_t shareSize, uint8_t **outputs)
int	botan_zfec_encode (size_t K, size_t N, const uint8_t *input, size_t size, uint8_t **outputs)

Function Documentation

botan_zfec_decode()

int botan_zfec_decode	(	size_t	K,
		size_t	N,
		const size_t *	indexes,
		uint8_t *const *	inputs,
		size_t	shareSize,
		uint8_t **	outputs )

Decode some previously encoded shares using certain ZFEC parameters.

Parameters

K	the number of shares needed for recovery
N	the total number of shares
indexes	The index into the encoder's outputs for the corresponding element of the inputs array. Must be of length K.
inputs	K previously encoded shares to decode
shareSize	the length in bytes of each input
outputs	An out parameter pointing to a fully allocated array of size [K][shareSize]. For all k in range, a decoded block will written to the memory starting at outputs[k][0].

Returns

0 on success, negative on failure

Definition at line 31 of file ffi_zfec.cpp.

                                                                                                                 {
#if defined(BOTAN_HAS_ZFEC)
   return Botan_FFI::ffi_guard_thunk(__func__, [=]() -> int {
      std::map<size_t, const uint8_t*> shares;
      for(size_t k = 0; k < K; ++k) {
         shares.insert(std::pair<size_t, const uint8_t*>(indexes[k], inputs[k]));
      }
      Botan::ZFEC(K, N).decode_shares(
         shares, shareSize, [=](size_t index, const uint8_t block[], size_t blockSize) -> void {
            std::copy(block, block + blockSize, outputs[index]);
         });
      return BOTAN_FFI_SUCCESS;
   });
#else
   BOTAN_UNUSED(K, N, indexes, inputs, shareSize, outputs);
   return BOTAN_FFI_ERROR_NOT_IMPLEMENTED;
#endif
}

References BOTAN_FFI_ERROR_NOT_IMPLEMENTED, BOTAN_FFI_SUCCESS, BOTAN_UNUSED, Botan::ZFEC::decode_shares(), and Botan_FFI::ffi_guard_thunk().

Referenced by botan_srp6_server_session_step1().

botan_zfec_encode()

int botan_zfec_encode	(	size_t	K,
		size_t	N,
		const uint8_t *	input,
		size_t	size,
		uint8_t **	outputs )

ZFEC Encode some bytes with certain ZFEC parameters.

Parameters

K	the number of shares needed for recovery
N	the number of shares generated
input	the data to FEC
size	the length in bytes of input, which must be a multiple of K
outputs	An out parameter pointing to a fully allocated array of size [N][size / K]. For all n in range, an encoded block will be written to the memory starting at outputs[n][0].

Returns

0 on success, negative on failure

Definition at line 17 of file ffi_zfec.cpp.

                                                                                                {
#if defined(BOTAN_HAS_ZFEC)
   return Botan_FFI::ffi_guard_thunk(__func__, [=]() -> int {
      Botan::ZFEC(K, N).encode(input, size, [=](size_t index, const uint8_t block[], size_t blockSize) -> void {
         std::copy(block, block + blockSize, outputs[index]);
      });
      return BOTAN_FFI_SUCCESS;
   });
#else
   BOTAN_UNUSED(K, N, input, size, outputs);
   return BOTAN_FFI_ERROR_NOT_IMPLEMENTED;
#endif
}

References BOTAN_FFI_ERROR_NOT_IMPLEMENTED, BOTAN_FFI_SUCCESS, BOTAN_UNUSED, Botan::ZFEC::encode(), and Botan_FFI::ffi_guard_thunk().

Referenced by botan_srp6_server_session_step1().