X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=crypt.h;h=5ca6a54112b60f6d61b16485248fb28ff708df6b;hp=9623a0035a3b1a89818bd99c3c09c1dac041519b;hb=2bad70d84e763b4d866d7b97dbc1cdc8e030bd45;hpb=d5e27e2a346da2f18188d317926a60687d082732

diff --git a/crypt.h b/crypt.h
index 9623a003..5ca6a541 100644
--- a/crypt.h
+++ b/crypt.h
@@ -200,3 +200,42 @@ void hash_to_asc(const unsigned char *hash, char *asc);
  * less than or equal to h2, respectively.
  */
 int hash_compare(const unsigned char *h1, const unsigned char *h2);
+
+/** Size of the hash value in bytes. */
+#define HASH2_SIZE 32
+
+/**
+ * Compute the hash2 of the given input data.
+ *
+ * \param data Pointer to the data to compute the hash value from.
+ * \param len The length of \a data in bytes.
+ * \param hash Result pointer.
+ *
+ * \a hash must point to an area at least \p HASH2_SIZE bytes large.
+ *
+ * \sa sha(3), openssl(1).
+ * */
+void hash2_function(const char *data, unsigned long len, unsigned char *hash);
+
+/**
+ * Convert a hash2 value to ascii format.
+ *
+ * \param hash the hash value.
+ * \param asc Result pointer.
+ *
+ * \a asc must point to an area of at least 2 * \p HASH2_SIZE + 1 bytes which
+ * will be filled by the function with the ascii representation of the hash
+ * value given by \a hash, and a terminating \p NULL byte.
+ */
+void hash2_to_asc(const unsigned char *hash, char *asc);
+
+/**
+ * Compare two version 2 hashes.
+ *
+ * \param h1 Pointer to the first hash value.
+ * \param h2 Pointer to the second hash value.
+ *
+ * \return 1, -1, or zero, depending on whether \a h1 is greater than,
+ * less than or equal to h2, respectively.
+ */
+int hash2_compare(const unsigned char *h1, const unsigned char *h2);