Helper functions for libgcrypt MPIs. More...

#include "platform.h"
#include <gcrypt.h>
#include "gnunet_util_lib.h"

Include dependency graph for crypto_mpi.c:

Macros
#define	LOG(kind, ...) GNUNET_log_from (kind, "util-crypto-mpi", __VA_ARGS__)

#define	LOG_GCRY(level, cmd, rc)
	Log an error message at log-level 'level' that indicates a failure of the command 'cmd' with the message given by gcry_strerror(rc). More...

Functions
static void	adjust (void *buf, size_t size, size_t target)
	If target != size, move target bytes to the end of the size-sized buffer and zero out the first target - size bytes. More...

void	GNUNET_CRYPTO_mpi_print_unsigned (void *buf, size_t size, gcry_mpi_t val)
	Output the given MPI value to the given buffer in network byte order. More...

void	GNUNET_CRYPTO_mpi_scan_unsigned (gcry_mpi_t result, const void data, size_t size)
	Convert data buffer into MPI value. More...

void	GNUNET_CRYPTO_mpi_scan_unsigned_le (gcry_mpi_t result, const void data, size_t size)
	Convert little endian data buffer into MPI value. More...

Detailed Description

Helper functions for libgcrypt MPIs.

Author: Christian Grothoff; Florian Dold

Definition in file crypto_mpi.c.

Macro Definition Documentation

◆ LOG

#define LOG	(	kind,
		...
	)	GNUNET_log_from (kind, "util-crypto-mpi", __VA_ARGS__)

Definition at line 33 of file crypto_mpi.c.

◆ LOG_GCRY

#define LOG_GCRY	(	level,
		cmd,
		rc
	)

Value:

                                             do { LOG (level, _ ( \
                                             "`%s' failed at %s:%d with error: %s\n"), \
                                           cmd, __FILE__, __LINE__, \
                                           gcry_strerror (rc)); } while (0)

Log an error message at log-level 'level' that indicates a failure of the command 'cmd' with the message given by gcry_strerror(rc).

Definition at line 40 of file crypto_mpi.c.

Function Documentation

◆ adjust()

static void adjust	(	void *	buf,
		size_t	size,
		size_t	target
	)

static

If target != size, move target bytes to the end of the size-sized buffer and zero out the first target - size bytes.

Parameters

buf	original buffer
size	number of bytes in buf
target	target size of the buffer

Definition at line 55 of file crypto_mpi.c.

{
  char *p = buf;
 
  if (size < target)
  {
    memmove (&p[target - size], buf, size);
    memset (buf, 0, target - size);
  }
}

References p, and size.

Referenced by GNUNET_CRYPTO_mpi_print_unsigned().

Here is the caller graph for this function:

◆ GNUNET_CRYPTO_mpi_scan_unsigned_le()

void GNUNET_CRYPTO_mpi_scan_unsigned_le	(	gcry_mpi_t *	result,
		const void *	data,
		size_t	size
	)

Convert little endian data buffer into MPI value.

The buffer is interpreted as network byte order, unsigned integer.

Parameters

result	where to store MPI value (allocated)
data	raw data (GCRYMPI_FMT_USG)
size	number of bytes in data

Definition at line 160 of file crypto_mpi.c.

{
  int rc;
 
  if (0 != (rc = gcry_mpi_scan (result,
                                GCRYMPI_FMT_USG,
                                data, size, &size)))
  {
    LOG_GCRY (GNUNET_ERROR_TYPE_ERROR,
              "gcry_mpi_scan",
              rc);
    GNUNET_assert (0);
  }
}

References data, GNUNET_assert, GNUNET_ERROR_TYPE_ERROR, LOG_GCRY, result, and size.

Macros