3 files changed, 31 insertions, 9 deletions

diff --git a/src/util/crypto_hash.c b/src/util/crypto_hash.c
index 4982ba404..622953476 100644
--- a/src/util/crypto_hash.c
+++ b/src/util/crypto_hash.c
@@ -244,17 +244,34 @@ GNUNET_CRYPTO_hash_to_aes_key (const struct GNUNET_HashCode *hc,
 /**
  * Obtain a bit from a hashcode.
  * @param code the GNUNET_CRYPTO_hash to index bit-wise
- * @param bit index into the hashcode, [0...511]
+ * @param bit index into the hashcode, [0...511] where 0 is the leftmost bit
+ *        (bytes in code interpreted big endian)
  * @return Bit \a bit from hashcode \a code, -1 for invalid index
  */
 int
-GNUNET_CRYPTO_hash_get_bit (const struct GNUNET_HashCode *code, unsigned int
-                            bit)
+GNUNET_CRYPTO_hash_get_bit_ltr (const struct GNUNET_HashCode *code,
+                            unsigned int bit)
 {
   GNUNET_assert (bit < 8 * sizeof(struct GNUNET_HashCode));
   return (((unsigned char *) code)[bit >> 3] & (128 >> (bit & 7))) > 0;
 }
 
+/**
+ * Obtain a bit from a hashcode.
+ * @param code the GNUNET_CRYPTO_hash to index bit-wise
+ * @param bit index into the hashcode, [0...511] where 0 is the rightmost bit
+ *        (bytes in code interpreted little endian)
+ * @return Bit \a bit from hashcode \a code, -1 for invalid index
+ */
+int
+GNUNET_CRYPTO_hash_get_bit_rtl (const struct GNUNET_HashCode *code,
+                                unsigned int bit)
+{
+  GNUNET_assert (bit < 8 * sizeof(struct GNUNET_HashCode));
+  return (((unsigned char *) code)[bit >> 3] & (1 << (bit & 7))) > 0;
+}
+
+
 
 /**
  * Determine how many low order bits match in two
@@ -275,8 +292,8 @@ GNUNET_CRYPTO_hash_matching_bits (const struct GNUNET_HashCode *first,
   unsigned int i;
 
   for (i = 0; i < sizeof(struct GNUNET_HashCode) * 8; i++)
-    if (GNUNET_CRYPTO_hash_get_bit (first, i) !=
-        GNUNET_CRYPTO_hash_get_bit (second, i))
+    if (GNUNET_CRYPTO_hash_get_bit_rtl (first, i) !=
+        GNUNET_CRYPTO_hash_get_bit_rtl (second, i))
       return i;
   return sizeof(struct GNUNET_HashCode) * 8;
 }
diff --git a/src/util/gnunet-scrypt.c b/src/util/gnunet-scrypt.c
index 70ba48d82..9bb766595 100644
--- a/src/util/gnunet-scrypt.c
+++ b/src/util/gnunet-scrypt.c
@@ -79,7 +79,7 @@ count_leading_zeroes (const struct GNUNET_HashCode *hash)
   unsigned int hash_count;
 
   hash_count = 0;
-  while (0 == GNUNET_CRYPTO_hash_get_bit (hash, hash_count))
+  while (0 == GNUNET_CRYPTO_hash_get_bit_ltr (hash, hash_count))
     hash_count++;
   return hash_count;
 }
diff --git a/src/util/test_crypto_hash.c b/src/util/test_crypto_hash.c
index 12e1324dd..d22e1f5d3 100644
--- a/src/util/test_crypto_hash.c
+++ b/src/util/test_crypto_hash.c
@@ -91,10 +91,15 @@ testArithmetic ()
     return 1;
   if (1 != GNUNET_CRYPTO_hash_xorcmp (&h1, &h2, &h2))
     return 1;
-  memset (&d, 0xF0, sizeof(d));
-  if (0 != GNUNET_CRYPTO_hash_get_bit (&d, 3))
+  memset (&d, 0x40, sizeof(d));
+  if (0 != GNUNET_CRYPTO_hash_get_bit_rtl (&d, 3))
     return 1;
-  if (1 != GNUNET_CRYPTO_hash_get_bit (&d, 6))
+  if (1 != GNUNET_CRYPTO_hash_get_bit_rtl (&d, 6))
+    return 1;
+  memset (&d, 0x02, sizeof(d));
+  if (0 != GNUNET_CRYPTO_hash_get_bit_ltr (&d, 3))
+    return 1;
+  if (1 != GNUNET_CRYPTO_hash_get_bit_ltr (&d, 6))
     return 1;
   memset (&d, 0, sizeof(d));
   GNUNET_CRYPTO_hash_to_aes_key (&d, &skey, &iv);