helper function for easy EdDSA key setup More...

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

Include dependency graph for crypto_ecc_setup.c:

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

#define	LOG_STRERROR(kind, syscall) GNUNET_log_from_strerror (kind, "util-crypto-ecc", syscall)

#define	LOG_STRERROR_FILE(kind, syscall, filename)

#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).

Functions
static enum GNUNET_GenericReturnValue	read_from_file (const char filename, void buf, size_t buf_size)
	Read file to buf.

enum GNUNET_GenericReturnValue	GNUNET_CRYPTO_eddsa_key_from_file (const char filename, int do_create, struct GNUNET_CRYPTO_EddsaPrivateKey pkey)
	Create a new private key by reading it from a file.

struct GNUNET_CRYPTO_EddsaPrivateKey *	GNUNET_CRYPTO_eddsa_key_create_from_configuration (const struct GNUNET_CONFIGURATION_Handle *cfg)
	Create a new private key by reading our peer's key from the file specified in the configuration.

enum GNUNET_GenericReturnValue	GNUNET_CRYPTO_get_peer_identity (const struct GNUNET_CONFIGURATION_Handle cfg, struct GNUNET_PeerIdentity dst)
	Retrieve the identity of the host's peer.

enum GNUNET_GenericReturnValue	GNUNET_CRYPTO_blinded_key_sign_by_peer_identity (const struct GNUNET_CONFIGURATION_Handle cfg, const struct GNUNET_CRYPTO_SignaturePurpose purpose, struct GNUNET_CRYPTO_EddsaSignature *sig)
	Sign a given block with a specific purpose using the host's peer identity.

enum GNUNET_GenericReturnValue	GNUNET_CRYPTO_verify_peer_identity (uint32_t purpose, const struct GNUNET_CRYPTO_SignaturePurpose validate, const struct GNUNET_CRYPTO_EddsaSignature sig, const struct GNUNET_PeerIdentity *identity)
	Verify a given signature with a peer's identity.

Detailed Description

helper function for easy EdDSA key setup

Author: Christian Grothoff

Definition in file crypto_ecc_setup.c.

Macro Definition Documentation

◆ LOG

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

Definition at line 31 of file crypto_ecc_setup.c.

◆ LOG_STRERROR

#define LOG_STRERROR	(	kind,
		syscall
	)	GNUNET_log_from_strerror (kind, "util-crypto-ecc", syscall)

Definition at line 33 of file crypto_ecc_setup.c.

        {                                                   \
          LOG (level,                                       \
               _ ("`%s' failed at %s:%d with error: %s\n"), \
               cmd,                                         \
               __FILE__,                                    \
               __LINE__,                                    \
               gcry_strerror (rc));                         \
        } while (0)
 
 
static enum GNUNET_GenericReturnValue
read_from_file (const char *filename,
                void *buf,
                size_t buf_size)
{
  int fd;
  struct stat sb;
 
  fd = open (filename,
             O_RDONLY);
  if (-1 == fd)
  {
    memset (buf,
            0,
            buf_size);
    return GNUNET_SYSERR;
  }
  if (0 != fstat (fd,
                  &sb))
  {
    GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING,
                              "stat",
                              filename);
    GNUNET_assert (0 == close (fd));
    memset (buf,
            0,
            buf_size);
    return GNUNET_SYSERR;
  }
  if (sb.st_size != buf_size)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                "File `%s' has wrong size (%llu), expected %llu bytes\n",
                filename,
                (unsigned long long) sb.st_size,
                (unsigned long long) buf_size);
    GNUNET_assert (0 == close (fd));
    memset (buf,
            0,
            buf_size);
    return GNUNET_SYSERR;
  }
  if (buf_size !=
      read (fd,
            buf,
            buf_size))
  {
    GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING,
                              "read",
                              filename);
    GNUNET_assert (0 == close (fd));
    memset (buf,
            0,
            buf_size);
    return GNUNET_SYSERR;
  }
  GNUNET_assert (0 == close (fd));
  return GNUNET_OK;
}
 
 
enum GNUNET_GenericReturnValue
GNUNET_CRYPTO_eddsa_key_from_file (const char *filename,
                                   int do_create,
                                   struct GNUNET_CRYPTO_EddsaPrivateKey *pkey)
{
  enum GNUNET_GenericReturnValue ret;
 
  if (GNUNET_OK ==
      read_from_file (filename,
                      pkey,
                      sizeof (*pkey)))
  {
    /* file existed, report that we didn't create it... */
    return (do_create) ? GNUNET_NO : GNUNET_OK;
  }
  else if (! do_create)
  {
    return GNUNET_SYSERR;
  }
 
  GNUNET_CRYPTO_eddsa_key_create (pkey);
  ret = GNUNET_DISK_fn_write (filename,
                              pkey,
                              sizeof (*pkey),
                              GNUNET_DISK_PERM_USER_READ);
  if ( (GNUNET_OK == ret) ||
       (GNUNET_SYSERR == ret) )
    return ret;
  /* maybe another process succeeded in the meantime, try reading one more time */
  if (GNUNET_OK ==
      read_from_file (filename,
                      pkey,
                      sizeof (*pkey)))
  {
    /* file existed, report that *we* didn't create it... */
    return GNUNET_NO;
  }
  /* give up */
  return GNUNET_SYSERR;
}
 
 
struct GNUNET_CRYPTO_EddsaPrivateKey *
GNUNET_CRYPTO_eddsa_key_create_from_configuration (
  const struct GNUNET_CONFIGURATION_Handle *cfg)
{
  struct GNUNET_CRYPTO_EddsaPrivateKey *priv;
  char *fn;
 
  if (GNUNET_OK !=
      GNUNET_CONFIGURATION_get_value_filename (cfg,
                                               "PEER",
                                               "PRIVATE_KEY",
                                               &fn))
    return NULL;
  priv = GNUNET_new (struct GNUNET_CRYPTO_EddsaPrivateKey);
  if (GNUNET_SYSERR == GNUNET_CRYPTO_eddsa_key_from_file (fn,
                                                          GNUNET_YES,
                                                          priv))
  {
    GNUNET_free (fn);
    GNUNET_free (priv);
    return NULL;
  }
  GNUNET_free (fn);
  return priv;
}
 
 
enum GNUNET_GenericReturnValue
GNUNET_CRYPTO_get_peer_identity (const struct GNUNET_CONFIGURATION_Handle *cfg,
                                 struct GNUNET_PeerIdentity *dst)
{
  struct GNUNET_CRYPTO_EddsaPrivateKey *priv;
 
  if (NULL == (priv = GNUNET_CRYPTO_eddsa_key_create_from_configuration (cfg)))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                _ ("Could not load peer's private key\n"));
    return GNUNET_SYSERR;
  }
  GNUNET_CRYPTO_eddsa_key_get_public (priv,
                                      &dst->public_key);
  GNUNET_free (priv);
  return GNUNET_OK;
}
 
 
enum GNUNET_GenericReturnValue
GNUNET_CRYPTO_blinded_key_sign_by_peer_identity (const struct
                                                 GNUNET_CONFIGURATION_Handle *
                                                 cfg,
                                                 const struct
                                                 GNUNET_CRYPTO_SignaturePurpose
                                                 *purpose,
                                                 struct
                                                 GNUNET_CRYPTO_EddsaSignature *
                                                 sig)
{
  struct GNUNET_CRYPTO_EddsaPrivateKey *priv;
  enum GNUNET_GenericReturnValue result;
 
  if (NULL == (priv = GNUNET_CRYPTO_eddsa_key_create_from_configuration (cfg)))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                _ ("Could not load peer's private key\n"));
    return GNUNET_SYSERR;
  }
 
  result = GNUNET_CRYPTO_eddsa_sign_ (priv, purpose, sig);
  GNUNET_CRYPTO_eddsa_key_clear (priv);
  return result;
}
 
 
enum GNUNET_GenericReturnValue
GNUNET_CRYPTO_verify_peer_identity (uint32_t purpose,
                                    const struct
                                    GNUNET_CRYPTO_SignaturePurpose *validate,
                                    const struct
                                    GNUNET_CRYPTO_EddsaSignature *sig,
                                    const struct GNUNET_PeerIdentity *identity)
{
  return GNUNET_CRYPTO_eddsa_verify_ (purpose, validate, sig,
                                      &identity->public_key);
}
 
 
/* end of crypto_ecc_setup.c */

◆ LOG_STRERROR_FILE

#define LOG_STRERROR_FILE	(	kind,
		syscall,
		filename
	)

Value:

GNUNET_log_from_strerror_file (kind, "util-crypto-ecc", syscall, \

filename)

GNUNET_log_from_strerror_file

#define GNUNET_log_from_strerror_file(level, component, cmd, filename)

Log an error message at log-level 'level' that indicates a failure of the command 'cmd' with the mess...

Definition gnunet_common.h:1146

Definition at line 36 of file crypto_ecc_setup.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 45 of file crypto_ecc_setup.c.

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

Function Documentation

◆ read_from_file()

static enum GNUNET_GenericReturnValue read_from_file	(	const char *	filename,
		void *	buf,
		size_t	buf_size
	)

static

Read file to buf.

Fails if the file does not exist or does not have precisely buf_size bytes.

Parameters

	filename	file to read
[out]	buf	where to write the file contents
	buf_size	number of bytes in buf

Returns: GNUNET_OK on success

Definition at line 67 of file crypto_ecc_setup.c.

{
  int fd;
  struct stat sb;
 
  fd = open (filename,
             O_RDONLY);
  if (-1 == fd)
  {
    memset (buf,
            0,
            buf_size);
    return GNUNET_SYSERR;
  }
  if (0 != fstat (fd,
                  &sb))
  {
    GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING,
                              "stat",
                              filename);
    GNUNET_assert (0 == close (fd));
    memset (buf,
            0,
            buf_size);
    return GNUNET_SYSERR;
  }
  if (sb.st_size != buf_size)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                "File `%s' has wrong size (%llu), expected %llu bytes\n",
                filename,
                (unsigned long long) sb.st_size,
                (unsigned long long) buf_size);
    GNUNET_assert (0 == close (fd));
    memset (buf,
            0,
            buf_size);
    return GNUNET_SYSERR;
  }
  if (buf_size !=
      read (fd,
            buf,
            buf_size))
  {
    GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING,
                              "read",
                              filename);
    GNUNET_assert (0 == close (fd));
    memset (buf,
            0,
            buf_size);
    return GNUNET_SYSERR;
  }
  GNUNET_assert (0 == close (fd));
  return GNUNET_OK;
}

References filename, GNUNET_assert, GNUNET_ERROR_TYPE_WARNING, GNUNET_log, GNUNET_log_strerror_file, GNUNET_OK, and GNUNET_SYSERR.

Referenced by GNUNET_CRYPTO_eddsa_key_from_file().

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Macros

Functions