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 dependency graph for delegate_misc.c:

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_IDENTITY_PrivateKey issuer, struct GNUNET_IDENTITY_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 37 of file delegate_misc.c.

 {
   char *cred_str;
   char *subject_pkey;
   char *issuer_pkey;
   char *signature;
  
   subject_pkey = GNUNET_IDENTITY_public_key_to_string (&cred->subject_key);
   issuer_pkey = GNUNET_IDENTITY_public_key_to_string (&cred->issuer_key);
   GNUNET_STRINGS_base64_encode ((char *) &cred->signature,
                                 sizeof (struct GNUNET_IDENTITY_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 GNUNET_TIME_Absolute::abs_value_us, GNUNET_ABD_Delegate::expiration, GNUNET_asprintf(), GNUNET_free, GNUNET_IDENTITY_public_key_to_string(), GNUNET_STRINGS_base64_encode(), GNUNET_ABD_Delegate::issuer_attribute, 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_value_to_string(), handle_collect_result(), and sign_cb().

Here is the call graph for this function:

Here is the caller graph for this function:

◆ GNUNET_ABD_delegate_from_string()

struct GNUNET_ABD_Delegate* GNUNET_ABD_delegate_from_string ( const char * s )

Definition at line 80 of file delegate_misc.c.

 {
   struct GNUNET_ABD_Delegate *dele;
   size_t enclen = (sizeof (struct GNUNET_IDENTITY_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_IDENTITY_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_IDENTITY_public_key_from_string (subject_pkey,
                                               &dele->subject_key))
   {
     GNUNET_free (dele);
     return NULL;
   }
   if (GNUNET_SYSERR ==
       GNUNET_IDENTITY_public_key_from_string (issuer_pkey,
                                               &dele->issuer_key))
   {
     GNUNET_free (dele);
     return NULL;
   }
   GNUNET_assert (sizeof (struct GNUNET_IDENTITY_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;
 }