X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=src%2Futil%2Fcrypto_kdf.c;h=9424c235085aee2a3d63764fd53f96fe26891f9c;hb=fdbe690beeec04066f18302401096eb5212c3f6a;hp=2fae10c238b77e7ade7ccf0a804ba676d3c29a5a;hpb=a339af3c6f42f5dfcd6117e831296399f7e31b95;p=oweals%2Fgnunet.git

diff --git a/src/util/crypto_kdf.c b/src/util/crypto_kdf.c
index 2fae10c23..9424c2350 100644
--- a/src/util/crypto_kdf.c
+++ b/src/util/crypto_kdf.c
@@ -4,7 +4,7 @@
 
      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 2, or (at your
+     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
@@ -29,36 +29,38 @@
 #include "platform.h"
 #include "gnunet_crypto_lib.h"
 
+#define LOG(kind,...) GNUNET_log_from (kind, "util", __VA_ARGS__)
+
 /**
  * @brief Derive key
  * @param result buffer for the derived key, allocated by caller
  * @param out_len desired length of the derived key
  * @param xts salt
- * @param xts_len length of xts
+ * @param xts_len length of @a xts
  * @param skm source key material
- * @param skm_len length of skm
+ * @param skm_len length of @a skm
  * @param argp va_list of void * & size_t pairs for context chunks
- * @return GNUNET_YES on success
+ * @return #GNUNET_YES on success
  */
 int
-GNUNET_CRYPTO_kdf_v (void *result, const unsigned long long out_len,
-    const void *xts, const size_t xts_len, const void *skm,
-    const size_t skm_len, const va_list argp)
+GNUNET_CRYPTO_kdf_v (void *result, size_t out_len, const void *xts,
+                     size_t xts_len, const void *skm, size_t skm_len,
+                     va_list argp)
 {
   /*
-   "Finally, we point out to a particularly advantageous instantiation using
-    HMAC-SHA512 as XTR and HMAC-SHA256 in PRF* (in which case the output from SHA-512 is
-    truncated to 256 bits). This makes sense in two ways: First, the extraction part is where we need a
-    stronger hash function due to the unconventional demand from the hash function in the extraction
-    setting. Second, as shown in Section 6, using HMAC with a truncated output as an extractor
-    allows to prove the security of HKDF under considerably weaker assumptions on the underlying
-    hash function."
-
-   http://eprint.iacr.org/2010/264
+   * "Finally, we point out to a particularly advantageous instantiation using
+   * HMAC-SHA512 as XTR and HMAC-SHA256 in PRF* (in which case the output from SHA-512 is
+   * truncated to 256 bits). This makes sense in two ways: First, the extraction part is where we need a
+   * stronger hash function due to the unconventional demand from the hash function in the extraction
+   * setting. Second, as shown in Section 6, using HMAC with a truncated output as an extractor
+   * allows to prove the security of HKDF under considerably weaker assumptions on the underlying
+   * hash function."
+   *
+   * http://eprint.iacr.org/2010/264
    */
 
   return GNUNET_CRYPTO_hkdf_v (result, out_len, GCRY_MD_SHA512, GCRY_MD_SHA256,
-      xts, xts_len, skm, skm_len, argp);
+                               xts, xts_len, skm, skm_len, argp);
 }
 
 /**
@@ -66,23 +68,22 @@ GNUNET_CRYPTO_kdf_v (void *result, const unsigned long long out_len,
  * @param result buffer for the derived key, allocated by caller
  * @param out_len desired length of the derived key
  * @param xts salt
- * @param xts_len length of xts
+ * @param xts_len length of @a xts
  * @param skm source key material
- * @param skm_len length of skm
+ * @param skm_len length of @a skm
  * @param ... void * & size_t pairs for context chunks
- * @return GNUNET_YES on success
+ * @return #GNUNET_YES on success
  */
 int
-GNUNET_CRYPTO_kdf (void *result, const unsigned long long out_len,
-    const void *xts, const size_t xts_len, const void *skm,
-    const size_t skm_len, ...)
+GNUNET_CRYPTO_kdf (void *result, size_t out_len, const void *xts,
+                   size_t xts_len, const void *skm, size_t skm_len, ...)
 {
   va_list argp;
   int ret;
 
-  va_start(argp, skm_len);
+  va_start (argp, skm_len);
   ret = GNUNET_CRYPTO_kdf_v (result, out_len, xts, xts_len, skm, skm_len, argp);
-  va_end(argp);
+  va_end (argp);
 
   return ret;
 }