delegate_misc.c File Reference

Misc API for delegate. More...

#include "platform.h"
#include "gnunet_util_lib.h"
#include "gnunet_constants.h"
#include "gnunet_abd_service.h"
#include "gnunet_signatures.h"
#include "abd.h"
#include <inttypes.h>
#include "delegate_misc.h"

Include dependency graph for delegate_misc.c:

Go to the source code of this file.

Functions
char *	GNUNET_ABD_delegate_to_string (const struct GNUNET_ABD_Delegate *cred)
struct GNUNET_ABD_Delegate *	GNUNET_ABD_delegate_from_string (const char *s)
struct GNUNET_ABD_Delegate *	GNUNET_ABD_delegate_issue (const struct GNUNET_CRYPTO_PrivateKey *issuer, struct GNUNET_CRYPTO_PublicKey *subject, const char *iss_attr, const char *sub_attr, struct GNUNET_TIME_Absolute *expiration)
	Issue an attribute to a subject. More...

Detailed Description

Misc API for delegate.

Author

Martin Schanzenbach

Definition in file delegate_misc.c.

Function Documentation

GNUNET_ABD_delegate_to_string()

char * GNUNET_ABD_delegate_to_string

(

const struct GNUNET_ABD_Delegate *

cred

)

Definition at line 38 of file delegate_misc.c.

{
  char *cred_str;
  char *subject_pkey;
  char *issuer_pkey;
  char *signature;
 
  subject_pkey = GNUNET_CRYPTO_public_key_to_string (&cred->subject_key);
  issuer_pkey = GNUNET_CRYPTO_public_key_to_string (&cred->issuer_key);
  GNUNET_STRINGS_base64_encode ((char *) &cred->signature,
                                sizeof (struct GNUNET_CRYPTO_Signature),
                                &signature);
  if (0 == cred->subject_attribute_len)
  {
    GNUNET_asprintf (&cred_str,
                     "%s.%s -> %s | %s | %" SCNu64,
                     issuer_pkey,
                     cred->issuer_attribute,
                     subject_pkey,
                     signature,
                     cred->expiration.abs_value_us);
  }
  else
  {
    GNUNET_asprintf (&cred_str,
                     "%s.%s -> %s.%s | %s | %" SCNu64,
                     issuer_pkey,
                     cred->issuer_attribute,
                     subject_pkey,
                     cred->subject_attribute,
                     signature,
                     cred->expiration.abs_value_us);
  }
  GNUNET_free (subject_pkey);
  GNUNET_free (issuer_pkey);
  GNUNET_free (signature);
 
  return cred_str;
}

References cred, GNUNET_asprintf(), GNUNET_CRYPTO_public_key_to_string(), GNUNET_free, GNUNET_STRINGS_base64_encode(), issuer_pkey, and subject_pkey.

Referenced by abd_value_to_string(), handle_collect_result(), and sign_cb().

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GNUNET_ABD_delegate_from_string()

struct GNUNET_ABD_Delegate * GNUNET_ABD_delegate_from_string

(

const char *

s

)

Definition at line 81 of file delegate_misc.c.

{
  struct GNUNET_ABD_Delegate *dele;
  size_t enclen = (sizeof (struct GNUNET_CRYPTO_PublicKey)) * 8;
  if (enclen % 5 > 0)
    enclen += 5 - enclen % 5;
  enclen /= 5; /* 260/5 = 52 */
  char subject_pkey[enclen + 1];
  char issuer_pkey[enclen + 1];
  char iss_attr[253 + 1];
  // Needs to be initialized, in case of Type 1 credential (A.a <- B)
  char sub_attr[253 + 1] = "";
  char signature[256]; // TODO max payload size
 
  struct GNUNET_CRYPTO_Signature *sig;
  struct GNUNET_TIME_Absolute etime_abs;
 
  // If it's A.a <- B.b...
  if (6 != sscanf (s,
                   "%58s.%253s -> %58s.%253s | %s | %" SCNu64,
                   issuer_pkey,
                   iss_attr,
                   subject_pkey,
                   sub_attr,
                   signature,
                   &etime_abs.abs_value_us))
  {
    // Try if it's A.a <- B
    if (5 != sscanf (s,
                     "%58s.%253s -> %58s | %s | %" SCNu64,
                     issuer_pkey,
                     iss_attr,
                     subject_pkey,
                     signature,
                     &etime_abs.abs_value_us))
    {
      GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                  "Unable to parse DEL record string `%s'\n",
                  s);
      return NULL;
    }
  }
 
  // +1 for \0
  int attr_len;
  if (strcmp (sub_attr, "") == 0)
  {
    attr_len = strlen (iss_attr) + 1;
  }
  else
  {
    attr_len = strlen (iss_attr) + strlen (sub_attr) + 2;
  }
  dele = GNUNET_malloc (sizeof (struct GNUNET_ABD_Delegate) + attr_len);
 
  char tmp_str[attr_len];
  GNUNET_memcpy (tmp_str, iss_attr, strlen (iss_attr));
  if (strcmp (sub_attr, "") != 0)
  {
    tmp_str[strlen (iss_attr)] = '\0';
    GNUNET_memcpy (tmp_str + strlen (iss_attr) + 1,
                   sub_attr,
                   strlen (sub_attr));
  }
  tmp_str[attr_len - 1] = '\0';
 
  if (GNUNET_SYSERR ==
      GNUNET_CRYPTO_public_key_from_string (subject_pkey,
                                              &dele->subject_key))
  {
    GNUNET_free (dele);
    return NULL;
  }
  if (GNUNET_SYSERR ==
      GNUNET_CRYPTO_public_key_from_string (issuer_pkey,
                                              &dele->issuer_key))
  {
    GNUNET_free (dele);
    return NULL;
  }
  GNUNET_assert (sizeof (struct GNUNET_CRYPTO_Signature) ==
                 GNUNET_STRINGS_base64_decode (signature,
                                               strlen (signature),
                                               (void **) &sig));
  dele->signature = *sig;
  dele->expiration = etime_abs;
  GNUNET_free (sig);
 
  GNUNET_memcpy (&dele[1], tmp_str, attr_len);
 
  dele->issuer_attribute = (char *) &dele[1];
  dele->issuer_attribute_len = strlen (iss_attr);
  if (strcmp (sub_attr, "") == 0)
  {
    dele->subject_attribute = NULL;
    dele->subject_attribute_len = 0;
  }
  else
  {
    dele->subject_attribute = (char *) &dele[1] + strlen (iss_attr) + 1;
    dele->subject_attribute_len = strlen (sub_attr);
  }
 
  return dele;
}

References GNUNET_TIME_Absolute::abs_value_us, GNUNET_ABD_Delegate::expiration, GNUNET_assert, GNUNET_CRYPTO_public_key_from_string(), GNUNET_ERROR_TYPE_ERROR, GNUNET_free, GNUNET_log, GNUNET_malloc, GNUNET_memcpy, GNUNET_STRINGS_base64_decode(), GNUNET_SYSERR, GNUNET_ABD_Delegate::issuer_attribute, GNUNET_ABD_Delegate::issuer_attribute_len, GNUNET_ABD_Delegate::issuer_key, issuer_pkey, GNUNET_ABD_Delegate::signature, GNUNET_ABD_Delegate::subject_attribute, GNUNET_ABD_Delegate::subject_attribute_len, GNUNET_ABD_Delegate::subject_key, and subject_pkey.

Referenced by abd_string_to_value(), run(), and store_cb().

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