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authorSchanzenbach, Martin <mschanzenbach@posteo.de>2016-12-17 00:00:10 +0100
committerSchanzenbach, Martin <mschanzenbach@posteo.de>2016-12-17 00:00:10 +0100
commit9c5ecc381458c941fdb70f1f4a47e76daac4eda5 (patch)
treea7baa5a1b81041cd886ed36bc9019990c4729d12 /src/credential
parent73a127e962c5ecbfc002b1b0c9ea9cf441591c6d (diff)
-refactoring
Diffstat (limited to 'src/credential')
-rw-r--r--src/credential/credential_misc.c168
-rw-r--r--src/credential/credential_misc.h35
2 files changed, 203 insertions, 0 deletions
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