X-Git-Url: http://mj.ucw.cz/gitweb/?a=blobdiff_plain;f=ucw%2Fsha1.h;h=4b17da548c97c6eaf98b158dddd2a28f7e6a43b4;hb=3bf739559578b42ef385479feb602b2dfe1f41b5;hp=2527e09a72f5e5204bef389aca83d1dda956428f;hpb=a4fe009d3366b0a3e119713b0ecc7fc0070efdfa;p=libucw.git

diff --git a/ucw/sha1.h b/ucw/sha1.h
index 2527e09a..4b17da54 100644
--- a/ucw/sha1.h
+++ b/ucw/sha1.h
@@ -1,7 +1,7 @@
 /*
  *	SHA-1 Hash Function (FIPS 180-1, RFC 3174)
  *
- *	(c) 2008 Martin Mares <mj@ucw.cz>
+ *	(c) 2008--2009 Martin Mares <mj@ucw.cz>
  *
  *	Based on the code from libgcrypt-1.2.3, which was:
  *
@@ -63,6 +63,19 @@ void sha1_hash_buffer(byte *outbuf, const byte *buffer, uns length);
  */
 void sha1_hmac(byte *outbuf, const byte *key, uns keylen, const byte *data, uns datalen);
 
+/**
+ * The HMAC also exists in a stream version in a way analogous to the
+ * plain SHA1. Pass this as a context.
+ */
+typedef struct {
+  sha1_context ictx;
+  sha1_context octx;
+} sha1_hmac_context;
+
+void sha1_hmac_init(sha1_hmac_context *hd, const byte *key, uns keylen);	/** Initialize HMAC with context @hd and the given key. See sha1_init(). */
+void sha1_hmac_update(sha1_hmac_context *hd, const byte *data, uns datalen);	/** Hash another @datalen bytes of data. See sha1_update(). */
+byte *sha1_hmac_final(sha1_hmac_context *hd);					/** Terminate the HMAC and return a pointer to the allocated hash. See sha1_final(). */
+
 #define SHA1_SIZE 20 /** Size of the SHA1 hash in its binary representation **/
 #define SHA1_HEX_SIZE 41 /** Buffer length for a string containing SHA1 in hexadecimal format. **/
 #define SHA1_BLOCK_SIZE 64 /** SHA1 splits input to blocks of this size. **/