[GNUnet-SVN] [gnunet] 56/171: -refactoring

[gnunet]

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martin-schanzenbach pushed a commit to branch master
in repository gnunet.

commit 9c5ecc381458c941fdb70f1f4a47e76daac4eda5
Author: Schanzenbach, Martin <address@hidden>
AuthorDate: Sat Dec 17 00:00:10 2016 +0100

    -refactoring
---
 src/credential/credential_misc.c | 168 +++++++++++++++++++++++++++++++++++++++
 src/credential/credential_misc.h |  35 ++++++++
 2 files changed, 203 insertions(+)

diff --git a/src/credential/credential_misc.c b/src/credential/credential_misc.c
new file mode 100644
index 000000000..f1be433e0
--- /dev/null
+++ b/src/credential/credential_misc.c
@@ -0,0 +1,168 @@
+/*
+     This file is part of GNUnet.
+     Copyright (C) 2009-2013, 2016 GNUnet e.V.
+
+     GNUnet is free software; you can redistribute it and/or modify
+     it under the terms of the GNU General Public License as published
+     by the Free Software Foundation; either version 3, or (at your
+     option) any later version.
+
+     GNUnet is distributed in the hope that it will be useful, but
+     WITHOUT ANY WARRANTY; without even the implied warranty of
+     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+     General Public License for more details.
+
+     You should have received a copy of the GNU General Public License
+     along with GNUnet; see the file COPYING.  If not, write to the
+     Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+     Boston, MA 02110-1301, USA.
+*/
+
+
+/**
+ * @file credential/credential_mic.c
+ * @brief Misc API for credentials
+ *
+ * @author Martin Schanzenbach
+ */
+#include "platform.h"
+#include "gnunet_util_lib.h"
+#include "gnunet_constants.h"
+#include "gnunet_credential_service.h"
+#include "gnunet_signatures.h"
+#include "credential.h"
+#include <inttypes.h>
+
+char*
+GNUNET_CREDENTIAL_credential_to_string (const struct 
GNUNET_CREDENTIAL_Credential *cred)
+{
+  char *cred_str;
+  char *subject_pkey;
+  char *issuer_pkey;
+  char *signature;
+
+
+  subject_pkey = GNUNET_CRYPTO_ecdsa_public_key_to_string (&cred->subject_key);
+  issuer_pkey = GNUNET_CRYPTO_ecdsa_public_key_to_string (&cred->issuer_key);
+  GNUNET_STRINGS_base64_encode ((char*)&cred->signature,
+                                sizeof (struct GNUNET_CRYPTO_EcdsaSignature),
+                                &signature);
+  GNUNET_asprintf (&cred_str,
+                   "%s.%s -> %s | %s | %"SCNu64,
+                   issuer_pkey,
+                   cred->issuer_attribute,
+                   subject_pkey,
+                   signature,
+                   cred->expiration.abs_value_us);
+  GNUNET_free (subject_pkey);
+  GNUNET_free (issuer_pkey);
+  GNUNET_free (signature);
+  return cred_str;
+}
+
+struct GNUNET_CREDENTIAL_Credential*
+GNUNET_CREDENTIAL_credential_from_string (const char* s)
+{
+  struct GNUNET_CREDENTIAL_Credential *cred;
+  size_t enclen = (sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey)) * 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 name[253 + 1];
+  char signature[256]; //TODO max payload size
+
+  struct GNUNET_CRYPTO_EcdsaSignature *sig;
+  struct GNUNET_TIME_Absolute etime_abs;
+
+  if (5 != SSCANF (s,
+                   "%52s.%253s -> %52s | %s | %"SCNu64,
+                   issuer_pkey,
+                   name,
+                   subject_pkey,
+                   signature,
+                   &etime_abs.abs_value_us))
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                _("Unable to parse CRED record string `%s'\n"),
+                s);
+    return NULL;
+  }
+  cred = GNUNET_malloc (sizeof (struct GNUNET_CREDENTIAL_Credential) + strlen 
(name) + 1);
+  GNUNET_CRYPTO_ecdsa_public_key_from_string (subject_pkey,
+                                              strlen (subject_pkey),
+                                              &cred->subject_key);
+  GNUNET_CRYPTO_ecdsa_public_key_from_string (issuer_pkey,
+                                              strlen (issuer_pkey),
+                                              &cred->issuer_key);
+  GNUNET_assert (sizeof (struct GNUNET_CRYPTO_EcdsaSignature) == 
GNUNET_STRINGS_base64_decode (signature,
+                                strlen (signature),
+                                (char**)&sig));
+  cred->signature = *sig;
+  cred->expiration = etime_abs;
+  GNUNET_free (sig);
+  GNUNET_memcpy (&cred[1],
+                 name,
+                 strlen (name)+1);
+  cred->issuer_attribute = (char*)&cred[1];
+  return cred;
+}
+
+/**
+ * Issue an attribute to a subject
+ *
+ * @param handle handle to the Credential service
+ * @param issuer the ego that should be used to issue the attribute
+ * @param subject the subject of the attribute
+ * @param attribute the name of the attribute
+ * @return handle to the queued request
+ */
+struct GNUNET_CREDENTIAL_Credential *
+GNUNET_CREDENTIAL_credential_issue (const struct GNUNET_CRYPTO_EcdsaPrivateKey 
*issuer,
+                                    struct GNUNET_CRYPTO_EcdsaPublicKey 
*subject,
+                                    const char *attribute,
+                                    struct GNUNET_TIME_Absolute *expiration)
+{
+  struct CredentialEntry *crd;
+  struct GNUNET_CREDENTIAL_Credential *cred;
+  size_t size;
+
+  size = sizeof (struct CredentialEntry) + strlen (attribute) + 1;
+  crd = GNUNET_malloc (size);
+  cred = GNUNET_malloc (sizeof (struct GNUNET_CREDENTIAL_Credential) + strlen 
(attribute) + 1);
+  crd->purpose.size = htonl (size - sizeof (struct 
GNUNET_CRYPTO_EcdsaSignature));
+
+  crd->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_CREDENTIAL);
+  GNUNET_CRYPTO_ecdsa_key_get_public (issuer,
+                                      &crd->issuer_key);
+  crd->subject_key = *subject;
+  crd->expiration = GNUNET_htonll (expiration->abs_value_us);
+  crd->issuer_attribute_len = htonl (strlen (attribute)+1);
+  GNUNET_memcpy ((char*)&crd[1],
+                 attribute,
+                 strlen (attribute)+1);
+  if (GNUNET_OK !=
+      GNUNET_CRYPTO_ecdsa_sign (issuer,
+                                &crd->purpose,
+                                &crd->signature))
+  {
+    GNUNET_break (0);
+    GNUNET_free (crd);
+    return NULL;
+  }
+  cred->signature = crd->signature;
+  cred->expiration = *expiration;
+  GNUNET_CRYPTO_ecdsa_key_get_public (issuer,
+                                      &cred->issuer_key);
+
+  cred->subject_key = *subject;
+  GNUNET_memcpy (&cred[1],
+                 attribute,
+                 strlen (attribute)+1);
+  cred->issuer_attribute = (char*)&cred[1];
+  GNUNET_free (crd);
+  return cred;
+}
+
+
diff --git a/src/credential/credential_misc.h b/src/credential/credential_misc.h
new file mode 100644
index 000000000..c3aa8c214
--- /dev/null
+++ b/src/credential/credential_misc.h
@@ -0,0 +1,35 @@
+/*
+      This file is part of GNUnet
+      Copyright (C) 2012-2013 GNUnet e.V.
+
+      GNUnet is free software; you can redistribute it and/or modify
+      it under the terms of the GNU General Public License as published
+      by the Free Software Foundation; either version 3, or (at your
+      option) any later version.
+
+      GNUnet is distributed in the hope that it will be useful, but
+      WITHOUT ANY WARRANTY; without even the implied warranty of
+      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+      General Public License for more details.
+
+      You should have received a copy of the GNU General Public License
+      along with GNUnet; see the file COPYING.  If not, write to the
+      Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+      Boston, MA 02110-1301, USA.
+ */
+/**
+ * @file credential/credential_misc.h
+ * @brief Credential helper functions
+ */
+#ifndef CREDENTIAL_MISC_H
+#define CREDENTIAL_MISC_H
+
+
+
+char*
+GNUNET_CREDENTIAL_credential_to_string (const struct 
GNUNET_CREDENTIAL_Credential *cred);
+
+struct GNUNET_CREDENTIAL_Credential*
+GNUNET_CREDENTIAL_credential_from_string (const char* str);
+
+#endif

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