verity_fec.c File Reference

#include <stdlib.h>
#include <errno.h>
#include "verity.h"
#include "internal.h"
#include "rs.h"

Include dependency graph for verity_fec.c:

Go to the source code of this file.

Data Structures
struct	fec_input_device
struct	fec_context

Macros
#define	FEC_RSM   255
#define	FEC_MIN_RSN   231
#define	FEC_MAX_RSN   253
#define	FEC_INPUT_DEVICES   2
#define	FEC_PARAMS(roots)

Functions
static uint64_t	FEC_div_round_up (uint64_t x, uint64_t y)
static uint64_t	FEC_interleave (struct fec_context *ctx, uint64_t offset)
static int	FEC_read_interleaved (struct fec_context *ctx, uint64_t i, void *output, size_t count)
static int	FEC_process_inputs (struct crypt_device *cd, struct crypt_params_verity *params, struct fec_input_device *inputs, size_t ninputs, int fd, int decode, unsigned int *errors)
int	VERITY_FEC_process (struct crypt_device *cd, struct crypt_params_verity *params, struct device *fec_device, int check_fec, unsigned int *errors)
uint64_t	VERITY_FEC_blocks (struct crypt_device *cd, struct device *fec_device, struct crypt_params_verity *params)

Macro Definition Documentation

FEC_INPUT_DEVICES

#define FEC_INPUT_DEVICES   2

Definition at line 34 of file verity_fec.c.

FEC_MAX_RSN

#define FEC_MAX_RSN   253

Definition at line 32 of file verity_fec.c.

FEC_MIN_RSN

#define FEC_MIN_RSN   231

Definition at line 31 of file verity_fec.c.

FEC_PARAMS

#define FEC_PARAMS

(

roots

)

Value:

    8,          /* symbol size in bits */ \
    0x11d,      /* field generator polynomial coefficients */ \
    0,          /* first root of the generator */ \
    1,          /* primitive element to generate polynomial roots */ \
    (roots),    /* polynomial degree (number of roots) */ \
    0           /* padding bytes at the front of shortened block */

Definition at line 37 of file verity_fec.c.

FEC_RSM

#define FEC_RSM   255

Definition at line 30 of file verity_fec.c.

Function Documentation

FEC_div_round_up()

static uint64_t FEC_div_round_up ( uint64_t  x, uint64_t  y  )

inlinestatic

Definition at line 64 of file verity_fec.c.

Referenced by FEC_process_inputs().

FEC_interleave()

static uint64_t FEC_interleave ( struct fec_context *  ctx, uint64_t  offset  )

inlinestatic

Definition at line 70 of file verity_fec.c.

References fec_context::block_size, fec_context::rounds, and fec_context::rsn.

Referenced by FEC_read_interleaved().

FEC_process_inputs()

static int FEC_process_inputs ( struct crypt_device *  cd, struct crypt_params_verity *  params, struct fec_input_device *  inputs, size_t  ninputs, int  fd, int  decode, unsigned int *  errors  )

static

Definition at line 107 of file verity_fec.c.

References _, fec_context::block_size, fec_context::blocks, fec_input_device::count, crypt_params_verity::data_block_size, decode_rs_char(), fec_input_device::device, device_path(), encode_rs_char(), FEC_div_round_up(), FEC_PARAMS, FEC_read_interleaved(), crypt_params_verity::fec_roots, FEC_RSM, free_rs_char(), init_rs_char(), fec_context::inputs, log_dbg, log_err, fec_context::ninputs, NULL, read_buffer(), fec_context::roots, fec_context::rounds, fec_context::rsn, fec_context::size, fec_input_device::start, and write_buffer().

Referenced by VERITY_FEC_process().

FEC_read_interleaved()

static int FEC_read_interleaved ( struct fec_context *  ctx, uint64_t  i, void *  output, size_t  count  )

static

Definition at line 77 of file verity_fec.c.

References fec_input_device::count, fec_input_device::fd, FEC_interleave(), fec_context::inputs, fec_context::ninputs, read_buffer(), fec_context::size, and fec_input_device::start.

Referenced by FEC_process_inputs().

VERITY_FEC_blocks()

uint64_t VERITY_FEC_blocks	(	struct crypt_device *	cd,
		struct device *	fec_device,
		struct crypt_params_verity *	params
	)

Definition at line 284 of file verity_fec.c.

References _, crypt_metadata_device(), crypt_params_verity::data_block_size, crypt_params_verity::data_size, device_is_identical(), device_path(), device_size(), crypt_params_verity::fec_area_offset, log_dbg, log_err, and VERITY_hash_offset_block().

Referenced by VERITY_activate(), and VERITY_FEC_process().

VERITY_FEC_process()

int VERITY_FEC_process	(	struct crypt_device *	cd,
		struct crypt_params_verity *	params,
		struct device *	fec_device,
		int	check_fec,
		unsigned int *	errors
	)

Definition at line 205 of file verity_fec.c.

References _, fec_input_device::count, crypt_data_device(), crypt_metadata_device(), crypt_params_verity::data_block_size, crypt_params_verity::data_size, fec_input_device::device, device_path(), fec_input_device::fd, crypt_params_verity::fec_area_offset, FEC_INPUT_DEVICES, FEC_MAX_RSN, FEC_MIN_RSN, FEC_process_inputs(), crypt_params_verity::fec_roots, FEC_RSM, crypt_params_verity::hash_block_size, log_dbg, log_err, fec_context::ninputs, VERITY_FEC_blocks(), and VERITY_hash_offset_block().

Referenced by _crypt_format_verity(), and VERITY_activate().