1 files changed, 97 insertions, 0 deletions
diff --git a/pjlib-util/src/pjlib-util/hmac_md5.c b/pjlib-util/src/pjlib-util/hmac_md5.c
new file mode 100644
index 0000000..9d61e39
--- /dev/null
+++ b/pjlib-util/src/pjlib-util/hmac_md5.c
@@ -0,0 +1,97 @@
+/* $Id: hmac_md5.c 3553 2011-05-05 06:14:19Z nanang $ */
+/* 
+ * Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com)
+ * Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org>
+ *
+ * This program 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 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 
+ */
+#include <pjlib-util/hmac_md5.h>
+#include <pj/string.h>
+
+
+PJ_DEF(void) pj_hmac_md5_init(pj_hmac_md5_context *hctx, 
+			      const pj_uint8_t *key, unsigned key_len)
+{
+    pj_uint8_t k_ipad[64];
+    pj_uint8_t tk[16];
+    int i;
+
+    /* if key is longer than 64 bytes reset it to key=MD5(key) */
+    if (key_len > 64) {
+        pj_md5_context      tctx;
+
+        pj_md5_init(&tctx);
+        pj_md5_update(&tctx, key, key_len);
+        pj_md5_final(&tctx, tk);
+
+        key = tk;
+        key_len = 16;
+    }
+
+    /*
+     * HMAC = H(K XOR opad, H(K XOR ipad, text))
+     */
+
+    /* start out by storing key in pads */
+    pj_bzero( k_ipad, sizeof(k_ipad));
+    pj_bzero( hctx->k_opad, sizeof(hctx->k_opad));
+    pj_memcpy( k_ipad, key, key_len);
+    pj_memcpy( hctx->k_opad, key, key_len);
+
+    /* XOR key with ipad and opad values */
+    for (i=0; i<64; i++) {
+        k_ipad[i] ^= 0x36;
+        hctx->k_opad[i] ^= 0x5c;
+    }
+    /*
+     * perform inner MD5
+     */
+    pj_md5_init(&hctx->context);
+    pj_md5_update(&hctx->context, k_ipad, 64);
+
+}
+
+PJ_DEF(void) pj_hmac_md5_update(pj_hmac_md5_context *hctx,
+				 const pj_uint8_t *input, 
+				 unsigned input_len)
+{
+    pj_md5_update(&hctx->context, input, input_len);
+}
+
+PJ_DEF(void) pj_hmac_md5_final(pj_hmac_md5_context *hctx,
+				pj_uint8_t digest[16])
+{
+    pj_md5_final(&hctx->context, digest);
+
+    /*
+     * perform outer MD5
+     */
+    pj_md5_init(&hctx->context);
+    pj_md5_update(&hctx->context, hctx->k_opad, 64);
+    pj_md5_update(&hctx->context, digest, 16);
+    pj_md5_final(&hctx->context, digest);
+}
+
+PJ_DEF(void) pj_hmac_md5( const pj_uint8_t *input, unsigned input_len, 
+			  const pj_uint8_t *key, unsigned key_len, 
+			  pj_uint8_t digest[16] )
+{
+    pj_hmac_md5_context ctx;
+
+    pj_hmac_md5_init(&ctx, key, key_len);
+    pj_hmac_md5_update(&ctx, input, input_len);
+    pj_hmac_md5_final(&ctx, digest);
+}
+