# HG changeset patch
# User Simon Josefsson <simon@josefsson.org>
# Date 1129554788 0
# Node ID a4b7c6c3f5bc03a5f689ae20047c58b1ceab47ba
# Parent  1cc68a6a839867c4249d18d90a26af2f60eb7ec4
Add more hash functions.

diff --git a/lib/ChangeLog b/lib/ChangeLog
--- a/lib/ChangeLog
+++ b/lib/ChangeLog
@@ -1,3 +1,7 @@
+2005-10-17  Simon Josefsson  <jas@extundo.com>
+
+	* gc.h, gc-libgcrypt.c: Add more hash types/functions.
+
 2005-10-17  Simon Josefsson  <jas@extundo.com>
 
 	* gc.h, gc-libgcrypt.c: Add ciphers.
diff --git a/lib/gc-libgcrypt.c b/lib/gc-libgcrypt.c
--- a/lib/gc-libgcrypt.c
+++ b/lib/gc-libgcrypt.c
@@ -215,6 +215,118 @@
 /* Hashes. */
 
 Gc_rc
+gc_hash_open (Gc_hash hash, Gc_hash_mode mode, gc_hash_handle * outhandle)
+{
+  int gcryalg, gcrymode;
+  gcry_error_t err;
+
+  switch (hash)
+    {
+    case GC_MD5:
+      gcryalg = GCRY_MD_MD5;
+      break;
+
+    case GC_SHA1:
+      gcryalg = GCRY_MD_SHA1;
+      break;
+
+    case GC_RMD160:
+      gcryalg = GCRY_MD_RMD160;
+      break;
+
+    default:
+      return GC_INVALID_HASH;
+    }
+
+  switch (mode)
+    {
+    case 0:
+      gcrymode = 0;
+      break;
+
+    case GC_HMAC:
+      gcrymode = GCRY_MD_FLAG_HMAC;
+      break;
+
+    default:
+      return GC_INVALID_HASH;
+    }
+
+  err = gcry_md_open ((gcry_md_hd_t *) outhandle, gcryalg, gcrymode);
+  if (gcry_err_code (err))
+    return GC_INVALID_HASH;
+
+  return GC_OK;
+}
+
+Gc_rc
+gc_hash_clone (gc_hash_handle handle, gc_hash_handle * outhandle)
+{
+  int err;
+
+  err = gcry_md_copy ((gcry_md_hd_t *) outhandle, (gcry_md_hd_t) handle);
+  if (err)
+    return GC_INVALID_HASH;
+
+  return GC_OK;
+}
+
+size_t
+gc_hash_digest_length (Gc_hash hash)
+{
+  int gcryalg;
+
+  switch (hash)
+    {
+    case GC_MD5:
+      gcryalg = GCRY_MD_MD5;
+      break;
+
+    case GC_SHA1:
+      gcryalg = GCRY_MD_SHA1;
+      break;
+
+    case GC_RMD160:
+      gcryalg = GCRY_MD_RMD160;
+      break;
+
+    default:
+      return 0;
+    }
+
+  return gcry_md_get_algo_dlen (gcryalg);
+}
+
+void
+gc_hash_hmac_setkey (gc_hash_handle handle, size_t len, const char *key)
+{
+  gcry_md_setkey ((gcry_md_hd_t) handle, key, len);
+}
+
+void
+gc_hash_write (gc_hash_handle handle, size_t len, const char *data)
+{
+  gcry_md_write ((gcry_md_hd_t) handle, data, len);
+}
+
+const char *
+gc_hash_read (gc_hash_handle handle)
+{
+  const char *digest;
+
+  gcry_md_final ((gcry_md_hd_t) handle);
+  digest = gcry_md_read ((gcry_md_hd_t) handle, 0);
+
+  return digest;
+}
+
+void
+gc_hash_close (gc_hash_handle handle)
+{
+  gcry_md_close ((gcry_md_hd_t) handle);
+}
+
+Gc_rc
 gc_hash_buffer (Gc_hash hash, const void *in, size_t inlen, char *resbuf)
 {
   int gcryalg;
@@ -233,6 +345,12 @@
       break;
 #endif
 
+#ifdef GC_USE_RMD160
+    case GC_RMD160:
+      gcryalg = GCRY_MD_RMD160;
+      break;
+#endif
+
     default:
       return GC_INVALID_HASH;
     }
diff --git a/lib/gc.h b/lib/gc.h
--- a/lib/gc.h
+++ b/lib/gc.h
@@ -42,10 +42,20 @@
 enum Gc_hash
   {
     GC_MD5,
-    GC_SHA1
+    GC_SHA1,
+    GC_MD2,
+    GC_RMD160
   };
 typedef enum Gc_hash Gc_hash;
 
+enum Gc_hash_mode
+  {
+    GC_HMAC = 1
+  };
+typedef enum Gc_hash_mode Gc_hash_mode;
+
+typedef void *gc_hash_handle;
+
 #define GC_MD5_DIGEST_SIZE 16
 #define GC_SHA1_DIGEST_SIZE 20
 
@@ -102,6 +112,17 @@
 
 /* Hashes. */
 
+extern Gc_rc gc_hash_open (Gc_hash hash, Gc_hash_mode mode,
+			   gc_hash_handle * outhandle);
+extern Gc_rc gc_hash_clone (gc_hash_handle handle, gc_hash_handle * outhandle);
+extern size_t gc_hash_digest_length (Gc_hash hash);
+extern void gc_hash_hmac_setkey (gc_hash_handle handle,
+				 size_t len, const char *key);
+extern void gc_hash_write (gc_hash_handle handle,
+			   size_t len, const char *data);
+extern const char *gc_hash_read (gc_hash_handle handle);
+extern void gc_hash_close (gc_hash_handle handle);
+
 /* Compute a hash value over buffer IN of INLEN bytes size using the
    algorithm HASH, placing the result in the pre-allocated buffer OUT.
    The required size of OUT depends on HASH, and is generally